// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/devm-helpers.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/ktime.h>
#include <linux/regulator/driver.h>
#include <linux/regmap.h>
#include <linux/list.h>
#include <linux/mfd/syscon.h>
#include <linux/io.h>

/* Pin control enable input pins. */
#define SPMI_REGULATOR_PIN_CTRL_ENABLE_NONE             0x00
#define SPMI_REGULATOR_PIN_CTRL_ENABLE_EN0              0x01
#define SPMI_REGULATOR_PIN_CTRL_ENABLE_EN1              0x02
#define SPMI_REGULATOR_PIN_CTRL_ENABLE_EN2              0x04
#define SPMI_REGULATOR_PIN_CTRL_ENABLE_EN3              0x08
#define SPMI_REGULATOR_PIN_CTRL_ENABLE_HW_DEFAULT       0x10

/* Pin control high power mode input pins. */
#define SPMI_REGULATOR_PIN_CTRL_HPM_NONE                0x00
#define SPMI_REGULATOR_PIN_CTRL_HPM_EN0                 0x01
#define SPMI_REGULATOR_PIN_CTRL_HPM_EN1                 0x02
#define SPMI_REGULATOR_PIN_CTRL_HPM_EN2                 0x04
#define SPMI_REGULATOR_PIN_CTRL_HPM_EN3                 0x08
#define SPMI_REGULATOR_PIN_CTRL_HPM_SLEEP_B             0x10
#define SPMI_REGULATOR_PIN_CTRL_HPM_HW_DEFAULT          0x20

/*
 * Used with enable parameters to specify that hardware default register values
 * should be left unaltered.
 */
#define SPMI_REGULATOR_USE_HW_DEFAULT                   2

/* Soft start strength of a voltage switch type regulator */
enum spmi_vs_soft_start_str {
        SPMI_VS_SOFT_START_STR_0P05_UA = 0,
        SPMI_VS_SOFT_START_STR_0P25_UA,
        SPMI_VS_SOFT_START_STR_0P55_UA,
        SPMI_VS_SOFT_START_STR_0P75_UA,
        SPMI_VS_SOFT_START_STR_HW_DEFAULT,
};

/**
 * struct spmi_regulator_init_data - spmi-regulator initialization data
 * @pin_ctrl_enable:        Bit mask specifying which hardware pins should be
 *                              used to enable the regulator, if any
 *                          Value should be an ORing of
 *                              SPMI_REGULATOR_PIN_CTRL_ENABLE_* constants.  If
 *                              the bit specified by
 *                              SPMI_REGULATOR_PIN_CTRL_ENABLE_HW_DEFAULT is
 *                              set, then pin control enable hardware registers
 *                              will not be modified.
 * @pin_ctrl_hpm:           Bit mask specifying which hardware pins should be
 *                              used to force the regulator into high power
 *                              mode, if any
 *                          Value should be an ORing of
 *                              SPMI_REGULATOR_PIN_CTRL_HPM_* constants.  If
 *                              the bit specified by
 *                              SPMI_REGULATOR_PIN_CTRL_HPM_HW_DEFAULT is
 *                              set, then pin control mode hardware registers
 *                              will not be modified.
 * @vs_soft_start_strength: This parameter sets the soft start strength for
 *                              voltage switch type regulators.  Its value
 *                              should be one of SPMI_VS_SOFT_START_STR_*.  If
 *                              its value is SPMI_VS_SOFT_START_STR_HW_DEFAULT,
 *                              then the soft start strength will be left at its
 *                              default hardware value.
 */
struct spmi_regulator_init_data {
        unsigned                                pin_ctrl_enable;
        unsigned                                pin_ctrl_hpm;
        enum spmi_vs_soft_start_str             vs_soft_start_strength;
};

/* These types correspond to unique register layouts. */
enum spmi_regulator_logical_type {
        SPMI_REGULATOR_LOGICAL_TYPE_SMPS,
        SPMI_REGULATOR_LOGICAL_TYPE_LDO,
        SPMI_REGULATOR_LOGICAL_TYPE_VS,
        SPMI_REGULATOR_LOGICAL_TYPE_BOOST,
        SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS,
        SPMI_REGULATOR_LOGICAL_TYPE_BOOST_BYP,
        SPMI_REGULATOR_LOGICAL_TYPE_LN_LDO,
        SPMI_REGULATOR_LOGICAL_TYPE_ULT_LO_SMPS,
        SPMI_REGULATOR_LOGICAL_TYPE_ULT_HO_SMPS,
        SPMI_REGULATOR_LOGICAL_TYPE_ULT_LDO,
        SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS426,
        SPMI_REGULATOR_LOGICAL_TYPE_HFS430,
};

enum spmi_regulator_type {
        SPMI_REGULATOR_TYPE_BUCK                = 0x03,
        SPMI_REGULATOR_TYPE_LDO                 = 0x04,
        SPMI_REGULATOR_TYPE_VS                  = 0x05,
        SPMI_REGULATOR_TYPE_BOOST               = 0x1b,
        SPMI_REGULATOR_TYPE_FTS                 = 0x1c,
        SPMI_REGULATOR_TYPE_BOOST_BYP           = 0x1f,
        SPMI_REGULATOR_TYPE_ULT_LDO             = 0x21,
        SPMI_REGULATOR_TYPE_ULT_BUCK            = 0x22,
};

enum spmi_regulator_subtype {
        SPMI_REGULATOR_SUBTYPE_GP_CTL           = 0x08,
        SPMI_REGULATOR_SUBTYPE_RF_CTL           = 0x09,
        SPMI_REGULATOR_SUBTYPE_N50              = 0x01,
        SPMI_REGULATOR_SUBTYPE_N150             = 0x02,
        SPMI_REGULATOR_SUBTYPE_N300             = 0x03,
        SPMI_REGULATOR_SUBTYPE_N600             = 0x04,
        SPMI_REGULATOR_SUBTYPE_N1200            = 0x05,
        SPMI_REGULATOR_SUBTYPE_N600_ST          = 0x06,
        SPMI_REGULATOR_SUBTYPE_N1200_ST         = 0x07,
        SPMI_REGULATOR_SUBTYPE_N900_ST          = 0x14,
        SPMI_REGULATOR_SUBTYPE_N300_ST          = 0x15,
        SPMI_REGULATOR_SUBTYPE_P50              = 0x08,
        SPMI_REGULATOR_SUBTYPE_P150             = 0x09,
        SPMI_REGULATOR_SUBTYPE_P300             = 0x0a,
        SPMI_REGULATOR_SUBTYPE_P600             = 0x0b,
        SPMI_REGULATOR_SUBTYPE_P1200            = 0x0c,
        SPMI_REGULATOR_SUBTYPE_LN               = 0x10,
        SPMI_REGULATOR_SUBTYPE_LV_P50           = 0x28,
        SPMI_REGULATOR_SUBTYPE_LV_P150          = 0x29,
        SPMI_REGULATOR_SUBTYPE_LV_P300          = 0x2a,
        SPMI_REGULATOR_SUBTYPE_LV_P600          = 0x2b,
        SPMI_REGULATOR_SUBTYPE_LV_P1200         = 0x2c,
        SPMI_REGULATOR_SUBTYPE_LV_P450          = 0x2d,
        SPMI_REGULATOR_SUBTYPE_HT_N300_ST       = 0x30,
        SPMI_REGULATOR_SUBTYPE_HT_N600_ST       = 0x31,
        SPMI_REGULATOR_SUBTYPE_HT_N1200_ST      = 0x32,
        SPMI_REGULATOR_SUBTYPE_HT_LVP150        = 0x3b,
        SPMI_REGULATOR_SUBTYPE_HT_LVP300        = 0x3c,
        SPMI_REGULATOR_SUBTYPE_L660_N300_ST     = 0x42,
        SPMI_REGULATOR_SUBTYPE_L660_N600_ST     = 0x43,
        SPMI_REGULATOR_SUBTYPE_L660_P50         = 0x46,
        SPMI_REGULATOR_SUBTYPE_L660_P150        = 0x47,
        SPMI_REGULATOR_SUBTYPE_L660_P600        = 0x49,
        SPMI_REGULATOR_SUBTYPE_L660_LVP150      = 0x4d,
        SPMI_REGULATOR_SUBTYPE_L660_LVP600      = 0x4f,
        SPMI_REGULATOR_SUBTYPE_LV100            = 0x01,
        SPMI_REGULATOR_SUBTYPE_LV300            = 0x02,
        SPMI_REGULATOR_SUBTYPE_MV300            = 0x08,
        SPMI_REGULATOR_SUBTYPE_MV500            = 0x09,
        SPMI_REGULATOR_SUBTYPE_HDMI             = 0x10,
        SPMI_REGULATOR_SUBTYPE_OTG              = 0x11,
        SPMI_REGULATOR_SUBTYPE_5V_BOOST         = 0x01,
        SPMI_REGULATOR_SUBTYPE_FTS_CTL          = 0x08,
        SPMI_REGULATOR_SUBTYPE_FTS2p5_CTL       = 0x09,
        SPMI_REGULATOR_SUBTYPE_FTS426_CTL       = 0x0a,
        SPMI_REGULATOR_SUBTYPE_BB_2A            = 0x01,
        SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL1      = 0x0d,
        SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL2      = 0x0e,
        SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL3      = 0x0f,
        SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL4      = 0x10,
        SPMI_REGULATOR_SUBTYPE_HFS430           = 0x0a,
};

enum spmi_common_regulator_registers {
        SPMI_COMMON_REG_DIG_MAJOR_REV           = 0x01,
        SPMI_COMMON_REG_TYPE                    = 0x04,
        SPMI_COMMON_REG_SUBTYPE                 = 0x05,
        SPMI_COMMON_REG_VOLTAGE_RANGE           = 0x40,
        SPMI_COMMON_REG_VOLTAGE_SET             = 0x41,
        SPMI_COMMON_REG_MODE                    = 0x45,
        SPMI_COMMON_REG_ENABLE                  = 0x46,
        SPMI_COMMON_REG_PULL_DOWN               = 0x48,
        SPMI_COMMON_REG_SOFT_START              = 0x4c,
        SPMI_COMMON_REG_STEP_CTRL               = 0x61,
};

/*
 * Second common register layout used by newer devices starting with ftsmps426
 * Note that some of the registers from the first common layout remain
 * unchanged and their definition is not duplicated.
 */
enum spmi_ftsmps426_regulator_registers {
        SPMI_FTSMPS426_REG_VOLTAGE_LSB          = 0x40,
        SPMI_FTSMPS426_REG_VOLTAGE_MSB          = 0x41,
        SPMI_FTSMPS426_REG_VOLTAGE_ULS_LSB      = 0x68,
        SPMI_FTSMPS426_REG_VOLTAGE_ULS_MSB      = 0x69,
};

enum spmi_vs_registers {
        SPMI_VS_REG_OCP                         = 0x4a,
        SPMI_VS_REG_SOFT_START                  = 0x4c,
};

enum spmi_boost_registers {
        SPMI_BOOST_REG_CURRENT_LIMIT            = 0x4a,
};

enum spmi_boost_byp_registers {
        SPMI_BOOST_BYP_REG_CURRENT_LIMIT        = 0x4b,
};

enum spmi_saw3_registers {
        SAW3_SECURE                             = 0x00,
        SAW3_ID                                 = 0x04,
        SAW3_SPM_STS                            = 0x0C,
        SAW3_AVS_STS                            = 0x10,
        SAW3_PMIC_STS                           = 0x14,
        SAW3_RST                                = 0x18,
        SAW3_VCTL                               = 0x1C,
        SAW3_AVS_CTL                            = 0x20,
        SAW3_AVS_LIMIT                          = 0x24,
        SAW3_AVS_DLY                            = 0x28,
        SAW3_AVS_HYSTERESIS                     = 0x2C,
        SAW3_SPM_STS2                           = 0x38,
        SAW3_SPM_PMIC_DATA_3                    = 0x4C,
        SAW3_VERSION                            = 0xFD0,
};

/* Used for indexing into ctrl_reg.  These are offets from 0x40 */
enum spmi_common_control_register_index {
        SPMI_COMMON_IDX_VOLTAGE_RANGE           = 0,
        SPMI_COMMON_IDX_VOLTAGE_SET             = 1,
        SPMI_COMMON_IDX_MODE                    = 5,
        SPMI_COMMON_IDX_ENABLE                  = 6,
};

/* Common regulator control register layout */
#define SPMI_COMMON_ENABLE_MASK                 0x80
#define SPMI_COMMON_ENABLE                      0x80
#define SPMI_COMMON_DISABLE                     0x00
#define SPMI_COMMON_ENABLE_FOLLOW_HW_EN3_MASK   0x08
#define SPMI_COMMON_ENABLE_FOLLOW_HW_EN2_MASK   0x04
#define SPMI_COMMON_ENABLE_FOLLOW_HW_EN1_MASK   0x02
#define SPMI_COMMON_ENABLE_FOLLOW_HW_EN0_MASK   0x01
#define SPMI_COMMON_ENABLE_FOLLOW_ALL_MASK      0x0f

/* Common regulator mode register layout */
#define SPMI_COMMON_MODE_HPM_MASK               0x80
#define SPMI_COMMON_MODE_AUTO_MASK              0x40
#define SPMI_COMMON_MODE_BYPASS_MASK            0x20
#define SPMI_COMMON_MODE_FOLLOW_AWAKE_MASK      0x10
#define SPMI_COMMON_MODE_FOLLOW_HW_EN3_MASK     0x08
#define SPMI_COMMON_MODE_FOLLOW_HW_EN2_MASK     0x04
#define SPMI_COMMON_MODE_FOLLOW_HW_EN1_MASK     0x02
#define SPMI_COMMON_MODE_FOLLOW_HW_EN0_MASK     0x01
#define SPMI_COMMON_MODE_FOLLOW_ALL_MASK        0x1f

#define SPMI_FTSMPS426_MODE_BYPASS_MASK         3
#define SPMI_FTSMPS426_MODE_RETENTION_MASK      4
#define SPMI_FTSMPS426_MODE_LPM_MASK            5
#define SPMI_FTSMPS426_MODE_AUTO_MASK           6
#define SPMI_FTSMPS426_MODE_HPM_MASK            7

#define SPMI_FTSMPS426_MODE_MASK                0x07

/* Common regulator pull down control register layout */
#define SPMI_COMMON_PULL_DOWN_ENABLE_MASK       0x80

/* LDO regulator current limit control register layout */
#define SPMI_LDO_CURRENT_LIMIT_ENABLE_MASK      0x80

/* LDO regulator soft start control register layout */
#define SPMI_LDO_SOFT_START_ENABLE_MASK         0x80

/* VS regulator over current protection control register layout */
#define SPMI_VS_OCP_OVERRIDE                    0x01
#define SPMI_VS_OCP_NO_OVERRIDE                 0x00

/* VS regulator soft start control register layout */
#define SPMI_VS_SOFT_START_ENABLE_MASK          0x80
#define SPMI_VS_SOFT_START_SEL_MASK             0x03

/* Boost regulator current limit control register layout */
#define SPMI_BOOST_CURRENT_LIMIT_ENABLE_MASK    0x80
#define SPMI_BOOST_CURRENT_LIMIT_MASK           0x07

#define SPMI_VS_OCP_DEFAULT_MAX_RETRIES         10
#define SPMI_VS_OCP_DEFAULT_RETRY_DELAY_MS      30
#define SPMI_VS_OCP_FALL_DELAY_US               90
#define SPMI_VS_OCP_FAULT_DELAY_US              20000

#define SPMI_FTSMPS_STEP_CTRL_STEP_MASK         0x18
#define SPMI_FTSMPS_STEP_CTRL_STEP_SHIFT        3
#define SPMI_FTSMPS_STEP_CTRL_DELAY_MASK        0x07
#define SPMI_FTSMPS_STEP_CTRL_DELAY_SHIFT       0

/* Clock rate in kHz of the FTSMPS regulator reference clock. */
#define SPMI_FTSMPS_CLOCK_RATE          19200

/* Minimum voltage stepper delay for each step. */
#define SPMI_FTSMPS_STEP_DELAY          8
#define SPMI_DEFAULT_STEP_DELAY         20

/*
 * The ratio SPMI_FTSMPS_STEP_MARGIN_NUM/SPMI_FTSMPS_STEP_MARGIN_DEN is used to
 * adjust the step rate in order to account for oscillator variance.
 */
#define SPMI_FTSMPS_STEP_MARGIN_NUM     4
#define SPMI_FTSMPS_STEP_MARGIN_DEN     5

#define SPMI_FTSMPS426_STEP_CTRL_DELAY_MASK     0x03
#define SPMI_FTSMPS426_STEP_CTRL_DELAY_SHIFT    0

/* Clock rate in kHz of the FTSMPS426 regulator reference clock. */
#define SPMI_FTSMPS426_CLOCK_RATE               4800

#define SPMI_HFS430_CLOCK_RATE                  1600

/* Minimum voltage stepper delay for each step. */
#define SPMI_FTSMPS426_STEP_DELAY               2

/*
 * The ratio SPMI_FTSMPS426_STEP_MARGIN_NUM/SPMI_FTSMPS426_STEP_MARGIN_DEN is
 * used to adjust the step rate in order to account for oscillator variance.
 */
#define SPMI_FTSMPS426_STEP_MARGIN_NUM  10
#define SPMI_FTSMPS426_STEP_MARGIN_DEN  11


/* VSET value to decide the range of ULT SMPS */
#define ULT_SMPS_RANGE_SPLIT 0x60

/**
 * struct spmi_voltage_range - regulator set point voltage mapping description
 * @min_uV:             Minimum programmable output voltage resulting from
 *                      set point register value 0x00
 * @max_uV:             Maximum programmable output voltage
 * @step_uV:            Output voltage increase resulting from the set point
 *                      register value increasing by 1
 * @set_point_min_uV:   Minimum allowed voltage
 * @set_point_max_uV:   Maximum allowed voltage.  This may be tweaked in order
 *                      to pick which range should be used in the case of
 *                      overlapping set points.
 * @n_voltages:         Number of preferred voltage set points present in this
 *                      range
 * @range_sel:          Voltage range register value corresponding to this range
 *
 * The following relationships must be true for the values used in this struct:
 * (max_uV - min_uV) % step_uV == 0
 * (set_point_min_uV - min_uV) % step_uV == 0*
 * (set_point_max_uV - min_uV) % step_uV == 0*
 * n_voltages = (set_point_max_uV - set_point_min_uV) / step_uV + 1
 *
 * *Note, set_point_min_uV == set_point_max_uV == 0 is allowed in order to
 * specify that the voltage range has meaning, but is not preferred.
 */
struct spmi_voltage_range {
        int                                     min_uV;
        int                                     max_uV;
        int                                     step_uV;
        int                                     set_point_min_uV;
        int                                     set_point_max_uV;
        unsigned                                n_voltages;
        u8                                      range_sel;
};

/*
 * The ranges specified in the spmi_voltage_set_points struct must be listed
 * so that range[i].set_point_max_uV < range[i+1].set_point_min_uV.
 */
struct spmi_voltage_set_points {
        struct spmi_voltage_range               *range;
        int                                     count;
        unsigned                                n_voltages;
};

struct spmi_regulator {
        struct regulator_desc                   desc;
        struct device                           *dev;
        struct delayed_work                     ocp_work;
        struct regmap                           *regmap;
        struct spmi_voltage_set_points          *set_points;
        enum spmi_regulator_logical_type        logical_type;
        int                                     ocp_irq;
        int                                     ocp_count;
        int                                     ocp_max_retries;
        int                                     ocp_retry_delay_ms;
        int                                     hpm_min_load;
        int                                     slew_rate;
        ktime_t                                 vs_enable_time;
        u16                                     base;
        struct list_head                        node;
};

struct spmi_regulator_mapping {
        enum spmi_regulator_type                type;
        enum spmi_regulator_subtype             subtype;
        enum spmi_regulator_logical_type        logical_type;
        u32                                     revision_min;
        u32                                     revision_max;
        const struct regulator_ops              *ops;
        struct spmi_voltage_set_points          *set_points;
        int                                     hpm_min_load;
};

struct spmi_regulator_data {
        const char                      *name;
        u16                             base;
        const char                      *supply;
        const char                      *ocp;
        u16                             force_type;
};

#define SPMI_VREG(_type, _subtype, _dig_major_min, _dig_major_max, \
                      _logical_type, _ops_val, _set_points_val, _hpm_min_load) \
        { \
                .type           = SPMI_REGULATOR_TYPE_##_type, \
                .subtype        = SPMI_REGULATOR_SUBTYPE_##_subtype, \
                .revision_min   = _dig_major_min, \
                .revision_max   = _dig_major_max, \
                .logical_type   = SPMI_REGULATOR_LOGICAL_TYPE_##_logical_type, \
                .ops            = &spmi_##_ops_val##_ops, \
                .set_points     = &_set_points_val##_set_points, \
                .hpm_min_load   = _hpm_min_load, \
        }

#define SPMI_VREG_VS(_subtype, _dig_major_min, _dig_major_max) \
        { \
                .type           = SPMI_REGULATOR_TYPE_VS, \
                .subtype        = SPMI_REGULATOR_SUBTYPE_##_subtype, \
                .revision_min   = _dig_major_min, \
                .revision_max   = _dig_major_max, \
                .logical_type   = SPMI_REGULATOR_LOGICAL_TYPE_VS, \
                .ops            = &spmi_vs_ops, \
        }

#define SPMI_VOLTAGE_RANGE(_range_sel, _min_uV, _set_point_min_uV, \
                        _set_point_max_uV, _max_uV, _step_uV) \
        { \
                .min_uV                 = _min_uV, \
                .max_uV                 = _max_uV, \
                .set_point_min_uV       = _set_point_min_uV, \
                .set_point_max_uV       = _set_point_max_uV, \
                .step_uV                = _step_uV, \
                .range_sel              = _range_sel, \
        }

#define DEFINE_SPMI_SET_POINTS(name) \
struct spmi_voltage_set_points name##_set_points = { \
        .range  = name##_ranges, \
        .count  = ARRAY_SIZE(name##_ranges), \
}

/*
 * These tables contain the physically available PMIC regulator voltage setpoint
 * ranges.  Where two ranges overlap in hardware, one of the ranges is trimmed
 * to ensure that the setpoints available to software are monotonically
 * increasing and unique.  The set_voltage callback functions expect these
 * properties to hold.
 */
static struct spmi_voltage_range pldo_ranges[] = {
        SPMI_VOLTAGE_RANGE(2,  750000,  750000, 1537500, 1537500, 12500),
        SPMI_VOLTAGE_RANGE(3, 1500000, 1550000, 3075000, 3075000, 25000),
        SPMI_VOLTAGE_RANGE(4, 1750000, 3100000, 4900000, 4900000, 50000),
};

static struct spmi_voltage_range nldo1_ranges[] = {
        SPMI_VOLTAGE_RANGE(2,  750000,  750000, 1537500, 1537500, 12500),
};

static struct spmi_voltage_range nldo2_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  375000,       0,       0, 1537500, 12500),
        SPMI_VOLTAGE_RANGE(1,  375000,  375000,  768750,  768750,  6250),
        SPMI_VOLTAGE_RANGE(2,  750000,  775000, 1537500, 1537500, 12500),
};

static struct spmi_voltage_range nldo3_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  375000,  375000, 1537500, 1537500, 12500),
        SPMI_VOLTAGE_RANGE(1,  375000,       0,       0, 1537500, 12500),
        SPMI_VOLTAGE_RANGE(2,  750000,       0,       0, 1537500, 12500),
};

static struct spmi_voltage_range ln_ldo_ranges[] = {
        SPMI_VOLTAGE_RANGE(1,  690000,  690000, 1110000, 1110000, 60000),
        SPMI_VOLTAGE_RANGE(0, 1380000, 1380000, 2220000, 2220000, 120000),
};

static struct spmi_voltage_range smps_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  375000,  375000, 1562500, 1562500, 12500),
        SPMI_VOLTAGE_RANGE(1, 1550000, 1575000, 3125000, 3125000, 25000),
};

static struct spmi_voltage_range ftsmps_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,       0,  350000, 1275000, 1275000,  5000),
        SPMI_VOLTAGE_RANGE(1,       0, 1280000, 2040000, 2040000, 10000),
};

static struct spmi_voltage_range ftsmps2p5_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,   80000,  350000, 1355000, 1355000,  5000),
        SPMI_VOLTAGE_RANGE(1,  160000, 1360000, 2200000, 2200000, 10000),
};

static struct spmi_voltage_range ftsmps426_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,       0,  320000, 1352000, 1352000,  4000),
};

static struct spmi_voltage_range boost_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 4000000, 4000000, 5550000, 5550000, 50000),
};

static struct spmi_voltage_range boost_byp_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 2500000, 2500000, 5200000, 5650000, 50000),
};

static struct spmi_voltage_range ult_lo_smps_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  375000,  375000, 1562500, 1562500, 12500),
        SPMI_VOLTAGE_RANGE(1,  750000,       0,       0, 1525000, 25000),
};

static struct spmi_voltage_range ult_ho_smps_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 1550000, 1550000, 2325000, 2325000, 25000),
};

static struct spmi_voltage_range ult_nldo_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  375000,  375000, 1537500, 1537500, 12500),
};

static struct spmi_voltage_range ult_pldo_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 1750000, 1750000, 3337500, 3337500, 12500),
};

static struct spmi_voltage_range pldo660_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 1504000, 1504000, 3544000, 3544000, 8000),
};

static struct spmi_voltage_range nldo660_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  320000,  320000, 1304000, 1304000, 8000),
};

static struct spmi_voltage_range ht_lvpldo_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 1504000, 1504000, 2000000, 2000000, 8000),
};

static struct spmi_voltage_range ht_nldo_ranges[] = {
        SPMI_VOLTAGE_RANGE(0,  312000,  312000, 1304000, 1304000, 8000),
};

static struct spmi_voltage_range hfs430_ranges[] = {
        SPMI_VOLTAGE_RANGE(0, 320000, 320000, 2040000, 2040000, 8000),
};

static DEFINE_SPMI_SET_POINTS(pldo);
static DEFINE_SPMI_SET_POINTS(nldo1);
static DEFINE_SPMI_SET_POINTS(nldo2);
static DEFINE_SPMI_SET_POINTS(nldo3);
static DEFINE_SPMI_SET_POINTS(ln_ldo);
static DEFINE_SPMI_SET_POINTS(smps);
static DEFINE_SPMI_SET_POINTS(ftsmps);
static DEFINE_SPMI_SET_POINTS(ftsmps2p5);
static DEFINE_SPMI_SET_POINTS(ftsmps426);
static DEFINE_SPMI_SET_POINTS(boost);
static DEFINE_SPMI_SET_POINTS(boost_byp);
static DEFINE_SPMI_SET_POINTS(ult_lo_smps);
static DEFINE_SPMI_SET_POINTS(ult_ho_smps);
static DEFINE_SPMI_SET_POINTS(ult_nldo);
static DEFINE_SPMI_SET_POINTS(ult_pldo);
static DEFINE_SPMI_SET_POINTS(pldo660);
static DEFINE_SPMI_SET_POINTS(nldo660);
static DEFINE_SPMI_SET_POINTS(ht_lvpldo);
static DEFINE_SPMI_SET_POINTS(ht_nldo);
static DEFINE_SPMI_SET_POINTS(hfs430);

static inline int spmi_vreg_read(struct spmi_regulator *vreg, u16 addr, u8 *buf,
                                 int len)
{
        return regmap_bulk_read(vreg->regmap, vreg->base + addr, buf, len);
}

static inline int spmi_vreg_write(struct spmi_regulator *vreg, u16 addr,
                                u8 *buf, int len)
{
        return regmap_bulk_write(vreg->regmap, vreg->base + addr, buf, len);
}

static int spmi_vreg_update_bits(struct spmi_regulator *vreg, u16 addr, u8 val,
                u8 mask)
{
        return regmap_update_bits(vreg->regmap, vreg->base + addr, mask, val);
}

static int spmi_regulator_vs_enable(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);

        if (vreg->ocp_irq) {
                vreg->ocp_count = 0;
                vreg->vs_enable_time = ktime_get();
        }

        return regulator_enable_regmap(rdev);
}

static int spmi_regulator_vs_ocp(struct regulator_dev *rdev, int lim_uA,
                                 int severity, bool enable)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 reg = SPMI_VS_OCP_OVERRIDE;

        if (lim_uA || !enable || severity != REGULATOR_SEVERITY_PROT)
                return -EINVAL;

        return spmi_vreg_write(vreg, SPMI_VS_REG_OCP, &reg, 1);
}

static int spmi_regulator_select_voltage(struct spmi_regulator *vreg,
                                         int min_uV, int max_uV)
{
        const struct spmi_voltage_range *range;
        int uV = min_uV;
        int lim_min_uV, lim_max_uV, i, range_id, range_max_uV;
        int selector, voltage_sel;

        /* Check if request voltage is outside of physically settable range. */
        lim_min_uV = vreg->set_points->range[0].set_point_min_uV;
        lim_max_uV =
          vreg->set_points->range[vreg->set_points->count - 1].set_point_max_uV;

        if (uV < lim_min_uV && max_uV >= lim_min_uV)
                uV = lim_min_uV;

        if (uV < lim_min_uV || uV > lim_max_uV) {
                dev_err(vreg->dev,
                        "request v=[%d, %d] is outside possible v=[%d, %d]\n",
                         min_uV, max_uV, lim_min_uV, lim_max_uV);
                return -EINVAL;
        }

        /* Find the range which uV is inside of. */
        for (i = vreg->set_points->count - 1; i > 0; i--) {
                range_max_uV = vreg->set_points->range[i - 1].set_point_max_uV;
                if (uV > range_max_uV && range_max_uV > 0)
                        break;
        }

        range_id = i;
        range = &vreg->set_points->range[range_id];

        /*
         * Force uV to be an allowed set point by applying a ceiling function to
         * the uV value.
         */
        voltage_sel = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
        uV = voltage_sel * range->step_uV + range->min_uV;

        if (uV > max_uV) {
                dev_err(vreg->dev,
                        "request v=[%d, %d] cannot be met by any set point; "
                        "next set point: %d\n",
                        min_uV, max_uV, uV);
                return -EINVAL;
        }

        selector = 0;
        for (i = 0; i < range_id; i++)
                selector += vreg->set_points->range[i].n_voltages;
        selector += (uV - range->set_point_min_uV) / range->step_uV;

        return selector;
}

static int spmi_sw_selector_to_hw(struct spmi_regulator *vreg,
                                  unsigned selector, u8 *range_sel,
                                  u8 *voltage_sel)
{
        const struct spmi_voltage_range *range, *end;
        unsigned offset;

        range = vreg->set_points->range;
        end = range + vreg->set_points->count;

        for (; range < end; range++) {
                if (selector < range->n_voltages) {
                        /*
                         * hardware selectors between set point min and real
                         * min are invalid so we ignore them
                         */
                        offset = range->set_point_min_uV - range->min_uV;
                        offset /= range->step_uV;
                        *voltage_sel = selector + offset;
                        *range_sel = range->range_sel;
                        return 0;
                }

                selector -= range->n_voltages;
        }

        return -EINVAL;
}

static int spmi_hw_selector_to_sw(struct spmi_regulator *vreg, u8 hw_sel,
                                  const struct spmi_voltage_range *range)
{
        unsigned sw_sel = 0;
        unsigned offset, max_hw_sel;
        const struct spmi_voltage_range *r = vreg->set_points->range;
        const struct spmi_voltage_range *end = r + vreg->set_points->count;

        for (; r < end; r++) {
                if (r == range && range->n_voltages) {
                        /*
                         * hardware selectors between set point min and real
                         * min and between set point max and real max are
                         * invalid so we return an error if they're
                         * programmed into the hardware
                         */
                        offset = range->set_point_min_uV - range->min_uV;
                        offset /= range->step_uV;
                        if (hw_sel < offset)
                                return -EINVAL;

                        max_hw_sel = range->set_point_max_uV - range->min_uV;
                        max_hw_sel /= range->step_uV;
                        if (hw_sel > max_hw_sel)
                                return -EINVAL;

                        return sw_sel + hw_sel - offset;
                }
                sw_sel += r->n_voltages;
        }

        return -EINVAL;
}

static const struct spmi_voltage_range *
spmi_regulator_find_range(struct spmi_regulator *vreg)
{
        u8 range_sel;
        const struct spmi_voltage_range *range, *end;

        range = vreg->set_points->range;
        end = range + vreg->set_points->count;

        spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_RANGE, &range_sel, 1);

        for (; range < end; range++)
                if (range->range_sel == range_sel)
                        return range;

        return NULL;
}

static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
                int min_uV, int max_uV)
{
        const struct spmi_voltage_range *range;
        int uV = min_uV;
        int i, selector;

        range = spmi_regulator_find_range(vreg);
        if (!range)
                goto different_range;

        if (uV < range->min_uV && max_uV >= range->min_uV)
                uV = range->min_uV;

        if (uV < range->min_uV || uV > range->max_uV) {
                /* Current range doesn't support the requested voltage. */
                goto different_range;
        }

        /*
         * Force uV to be an allowed set point by applying a ceiling function to
         * the uV value.
         */
        uV = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
        uV = uV * range->step_uV + range->min_uV;

        if (uV > max_uV) {
                /*
                 * No set point in the current voltage range is within the
                 * requested min_uV to max_uV range.
                 */
                goto different_range;
        }

        selector = 0;
        for (i = 0; i < vreg->set_points->count; i++) {
                if (uV >= vreg->set_points->range[i].set_point_min_uV
                    && uV <= vreg->set_points->range[i].set_point_max_uV) {
                        selector +=
                            (uV - vreg->set_points->range[i].set_point_min_uV)
                                / vreg->set_points->range[i].step_uV;
                        break;
                }

                selector += vreg->set_points->range[i].n_voltages;
        }

        if (selector >= vreg->set_points->n_voltages)
                goto different_range;

        return selector;

different_range:
        return spmi_regulator_select_voltage(vreg, min_uV, max_uV);
}

static int spmi_regulator_common_map_voltage(struct regulator_dev *rdev,
                                             int min_uV, int max_uV)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);

        /*
         * Favor staying in the current voltage range if possible.  This avoids
         * voltage spikes that occur when changing the voltage range.
         */
        return spmi_regulator_select_voltage_same_range(vreg, min_uV, max_uV);
}

static int
spmi_regulator_common_set_voltage(struct regulator_dev *rdev, unsigned selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        int ret;
        u8 buf[2];
        u8 range_sel, voltage_sel;

        ret = spmi_sw_selector_to_hw(vreg, selector, &range_sel, &voltage_sel);
        if (ret)
                return ret;

        buf[0] = range_sel;
        buf[1] = voltage_sel;
        return spmi_vreg_write(vreg, SPMI_COMMON_REG_VOLTAGE_RANGE, buf, 2);
}

static int spmi_regulator_common_list_voltage(struct regulator_dev *rdev,
                                              unsigned selector);

static int spmi_regulator_ftsmps426_set_voltage(struct regulator_dev *rdev,
                                              unsigned selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 buf[2];
        int mV;

        mV = spmi_regulator_common_list_voltage(rdev, selector) / 1000;

        buf[0] = mV & 0xff;
        buf[1] = mV >> 8;
        return spmi_vreg_write(vreg, SPMI_FTSMPS426_REG_VOLTAGE_LSB, buf, 2);
}

static int spmi_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
                unsigned int old_selector, unsigned int new_selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        int diff_uV;

        diff_uV = abs(spmi_regulator_common_list_voltage(rdev, new_selector) -
                      spmi_regulator_common_list_voltage(rdev, old_selector));

        return DIV_ROUND_UP(diff_uV, vreg->slew_rate);
}

static int spmi_regulator_common_get_voltage(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        const struct spmi_voltage_range *range;
        u8 voltage_sel;

        spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_SET, &voltage_sel, 1);

        range = spmi_regulator_find_range(vreg);
        if (!range)
                return -EINVAL;

        return spmi_hw_selector_to_sw(vreg, voltage_sel, range);
}

static int spmi_regulator_ftsmps426_get_voltage(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        const struct spmi_voltage_range *range;
        u8 buf[2];
        int uV;

        spmi_vreg_read(vreg, SPMI_FTSMPS426_REG_VOLTAGE_LSB, buf, 2);

        uV = (((unsigned int)buf[1] << 8) | (unsigned int)buf[0]) * 1000;
        range = vreg->set_points->range;

        return (uV - range->set_point_min_uV) / range->step_uV;
}

static int spmi_regulator_single_map_voltage(struct regulator_dev *rdev,
                int min_uV, int max_uV)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);

        return spmi_regulator_select_voltage(vreg, min_uV, max_uV);
}

static int spmi_regulator_single_range_set_voltage(struct regulator_dev *rdev,
                                                   unsigned selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 sel = selector;

        /*
         * Certain types of regulators do not have a range select register so
         * only voltage set register needs to be written.
         */
        return spmi_vreg_write(vreg, SPMI_COMMON_REG_VOLTAGE_SET, &sel, 1);
}

static int spmi_regulator_single_range_get_voltage(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 selector;
        int ret;

        ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_SET, &selector, 1);
        if (ret)
                return ret;

        return selector;
}

static int spmi_regulator_ult_lo_smps_set_voltage(struct regulator_dev *rdev,
                                                  unsigned selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        int ret;
        u8 range_sel, voltage_sel;

        ret = spmi_sw_selector_to_hw(vreg, selector, &range_sel, &voltage_sel);
        if (ret)
                return ret;

        /*
         * Calculate VSET based on range
         * In case of range 0: voltage_sel is a 7 bit value, can be written
         *                      witout any modification.
         * In case of range 1: voltage_sel is a 5 bit value, bits[7-5] set to
         *                      [011].
         */
        if (range_sel == 1)
                voltage_sel |= ULT_SMPS_RANGE_SPLIT;

        return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_VOLTAGE_SET,
                                     voltage_sel, 0xff);
}

static int spmi_regulator_ult_lo_smps_get_voltage(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        const struct spmi_voltage_range *range;
        u8 voltage_sel;

        spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_SET, &voltage_sel, 1);

        range = spmi_regulator_find_range(vreg);
        if (!range)
                return -EINVAL;

        if (range->range_sel == 1)
                voltage_sel &= ~ULT_SMPS_RANGE_SPLIT;

        return spmi_hw_selector_to_sw(vreg, voltage_sel, range);
}

static int spmi_regulator_common_list_voltage(struct regulator_dev *rdev,
                        unsigned selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        int uV = 0;
        int i;

        if (selector >= vreg->set_points->n_voltages)
                return 0;

        for (i = 0; i < vreg->set_points->count; i++) {
                if (selector < vreg->set_points->range[i].n_voltages) {
                        uV = selector * vreg->set_points->range[i].step_uV
                                + vreg->set_points->range[i].set_point_min_uV;
                        break;
                }

                selector -= vreg->set_points->range[i].n_voltages;
        }

        return uV;
}

static int
spmi_regulator_common_set_bypass(struct regulator_dev *rdev, bool enable)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 mask = SPMI_COMMON_MODE_BYPASS_MASK;
        u8 val = 0;

        if (enable)
                val = mask;

        return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_MODE, val, mask);
}

static int
spmi_regulator_common_get_bypass(struct regulator_dev *rdev, bool *enable)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 val;
        int ret;

        ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_MODE, &val, 1);
        *enable = val & SPMI_COMMON_MODE_BYPASS_MASK;

        return ret;
}

static unsigned int spmi_regulator_common_get_mode(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 reg;

        spmi_vreg_read(vreg, SPMI_COMMON_REG_MODE, &reg, 1);

        reg &= SPMI_COMMON_MODE_HPM_MASK | SPMI_COMMON_MODE_AUTO_MASK;

        switch (reg) {
        case SPMI_COMMON_MODE_HPM_MASK:
                return REGULATOR_MODE_NORMAL;
        case SPMI_COMMON_MODE_AUTO_MASK:
                return REGULATOR_MODE_FAST;
        default:
                return REGULATOR_MODE_IDLE;
        }
}

static unsigned int spmi_regulator_ftsmps426_get_mode(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 reg;

        spmi_vreg_read(vreg, SPMI_COMMON_REG_MODE, &reg, 1);

        switch (reg) {
        case SPMI_FTSMPS426_MODE_HPM_MASK:
                return REGULATOR_MODE_NORMAL;
        case SPMI_FTSMPS426_MODE_AUTO_MASK:
                return REGULATOR_MODE_FAST;
        default:
                return REGULATOR_MODE_IDLE;
        }
}

static int
spmi_regulator_common_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 mask = SPMI_COMMON_MODE_HPM_MASK | SPMI_COMMON_MODE_AUTO_MASK;
        u8 val;

        switch (mode) {
        case REGULATOR_MODE_NORMAL:
                val = SPMI_COMMON_MODE_HPM_MASK;
                break;
        case REGULATOR_MODE_FAST:
                val = SPMI_COMMON_MODE_AUTO_MASK;
                break;
        default:
                val = 0;
                break;
        }

        return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_MODE, val, mask);
}

static int
spmi_regulator_ftsmps426_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        u8 mask = SPMI_FTSMPS426_MODE_MASK;
        u8 val;

        switch (mode) {
        case REGULATOR_MODE_NORMAL:
                val = SPMI_FTSMPS426_MODE_HPM_MASK;
                break;
        case REGULATOR_MODE_FAST:
                val = SPMI_FTSMPS426_MODE_AUTO_MASK;
                break;
        case REGULATOR_MODE_IDLE:
                val = SPMI_FTSMPS426_MODE_LPM_MASK;
                break;
        default:
                return -EINVAL;
        }

        return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_MODE, val, mask);
}

static int
spmi_regulator_common_set_load(struct regulator_dev *rdev, int load_uA)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        unsigned int mode;

        if (load_uA >= vreg->hpm_min_load)
                mode = REGULATOR_MODE_NORMAL;
        else
                mode = REGULATOR_MODE_IDLE;

        return spmi_regulator_common_set_mode(rdev, mode);
}

static int spmi_regulator_common_set_pull_down(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        unsigned int mask = SPMI_COMMON_PULL_DOWN_ENABLE_MASK;

        return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_PULL_DOWN,
                                     mask, mask);
}

static int spmi_regulator_common_set_soft_start(struct regulator_dev *rdev)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        unsigned int mask = SPMI_LDO_SOFT_START_ENABLE_MASK;

        return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_SOFT_START,
                                     mask, mask);
}

static int spmi_regulator_set_ilim(struct regulator_dev *rdev, int ilim_uA)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        enum spmi_regulator_logical_type type = vreg->logical_type;
        unsigned int current_reg;
        u8 reg;
        u8 mask = SPMI_BOOST_CURRENT_LIMIT_MASK |
                  SPMI_BOOST_CURRENT_LIMIT_ENABLE_MASK;
        int max = (SPMI_BOOST_CURRENT_LIMIT_MASK + 1) * 500;

        if (type == SPMI_REGULATOR_LOGICAL_TYPE_BOOST)
                current_reg = SPMI_BOOST_REG_CURRENT_LIMIT;
        else
                current_reg = SPMI_BOOST_BYP_REG_CURRENT_LIMIT;

        if (ilim_uA > max || ilim_uA <= 0)
                return -EINVAL;

        reg = (ilim_uA - 1) / 500;
        reg |= SPMI_BOOST_CURRENT_LIMIT_ENABLE_MASK;

        return spmi_vreg_update_bits(vreg, current_reg, reg, mask);
}

static int spmi_regulator_vs_clear_ocp(struct spmi_regulator *vreg)
{
        int ret;

        ret = spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_ENABLE,
                SPMI_COMMON_DISABLE, SPMI_COMMON_ENABLE_MASK);

        vreg->vs_enable_time = ktime_get();

        ret = spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_ENABLE,
                SPMI_COMMON_ENABLE, SPMI_COMMON_ENABLE_MASK);

        return ret;
}

static void spmi_regulator_vs_ocp_work(struct work_struct *work)
{
        struct delayed_work *dwork = to_delayed_work(work);
        struct spmi_regulator *vreg
                = container_of(dwork, struct spmi_regulator, ocp_work);

        spmi_regulator_vs_clear_ocp(vreg);
}

static irqreturn_t spmi_regulator_vs_ocp_isr(int irq, void *data)
{
        struct spmi_regulator *vreg = data;
        ktime_t ocp_irq_time;
        s64 ocp_trigger_delay_us;

        ocp_irq_time = ktime_get();
        ocp_trigger_delay_us = ktime_us_delta(ocp_irq_time,
                                                vreg->vs_enable_time);

        /*
         * Reset the OCP count if there is a large delay between switch enable
         * and when OCP triggers.  This is indicative of a hotplug event as
         * opposed to a fault.
         */
        if (ocp_trigger_delay_us > SPMI_VS_OCP_FAULT_DELAY_US)
                vreg->ocp_count = 0;

        /* Wait for switch output to settle back to 0 V after OCP triggered. */
        udelay(SPMI_VS_OCP_FALL_DELAY_US);

        vreg->ocp_count++;

        if (vreg->ocp_count == 1) {
                /* Immediately clear the over current condition. */
                spmi_regulator_vs_clear_ocp(vreg);
        } else if (vreg->ocp_count <= vreg->ocp_max_retries) {
                /* Schedule the over current clear task to run later. */
                schedule_delayed_work(&vreg->ocp_work,
                        msecs_to_jiffies(vreg->ocp_retry_delay_ms) + 1);
        } else {
                dev_err(vreg->dev,
                        "OCP triggered %d times; no further retries\n",
                        vreg->ocp_count);
        }

        return IRQ_HANDLED;
}

#define SAW3_VCTL_DATA_MASK     0xFF
#define SAW3_VCTL_CLEAR_MASK    0x700FF
#define SAW3_AVS_CTL_EN_MASK    0x1
#define SAW3_AVS_CTL_TGGL_MASK  0x8000000
#define SAW3_AVS_CTL_CLEAR_MASK 0x7efc00

static struct regmap *saw_regmap;

static void spmi_saw_set_vdd(void *data)
{
        u32 vctl, data3, avs_ctl, pmic_sts;
        bool avs_enabled = false;
        unsigned long timeout;
        u8 voltage_sel = *(u8 *)data;

        regmap_read(saw_regmap, SAW3_AVS_CTL, &avs_ctl);
        regmap_read(saw_regmap, SAW3_VCTL, &vctl);
        regmap_read(saw_regmap, SAW3_SPM_PMIC_DATA_3, &data3);

        /* select the band */
        vctl &= ~SAW3_VCTL_CLEAR_MASK;
        vctl |= (u32)voltage_sel;

        data3 &= ~SAW3_VCTL_CLEAR_MASK;
        data3 |= (u32)voltage_sel;

        /* If AVS is enabled, switch it off during the voltage change */
        avs_enabled = SAW3_AVS_CTL_EN_MASK & avs_ctl;
        if (avs_enabled) {
                avs_ctl &= ~SAW3_AVS_CTL_TGGL_MASK;
                regmap_write(saw_regmap, SAW3_AVS_CTL, avs_ctl);
        }

        regmap_write(saw_regmap, SAW3_RST, 1);
        regmap_write(saw_regmap, SAW3_VCTL, vctl);
        regmap_write(saw_regmap, SAW3_SPM_PMIC_DATA_3, data3);

        timeout = jiffies + usecs_to_jiffies(100);
        do {
                regmap_read(saw_regmap, SAW3_PMIC_STS, &pmic_sts);
                pmic_sts &= SAW3_VCTL_DATA_MASK;
                if (pmic_sts == (u32)voltage_sel)
                        break;

                cpu_relax();

        } while (time_before(jiffies, timeout));

        /* After successful voltage change, switch the AVS back on */
        if (avs_enabled) {
                pmic_sts &= 0x3f;
                avs_ctl &= ~SAW3_AVS_CTL_CLEAR_MASK;
                avs_ctl |= ((pmic_sts - 4) << 10);
                avs_ctl |= (pmic_sts << 17);
                avs_ctl |= SAW3_AVS_CTL_TGGL_MASK;
                regmap_write(saw_regmap, SAW3_AVS_CTL, avs_ctl);
        }
}

static int
spmi_regulator_saw_set_voltage(struct regulator_dev *rdev, unsigned selector)
{
        struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
        int ret;
        u8 range_sel, voltage_sel;

        ret = spmi_sw_selector_to_hw(vreg, selector, &range_sel, &voltage_sel);
        if (ret)
                return ret;

        if (0 != range_sel) {
                dev_dbg(&rdev->dev, "range_sel = %02X voltage_sel = %02X", \
                        range_sel, voltage_sel);
                return -EINVAL;
        }

        /* Always do the SAW register writes on the first CPU */
        return smp_call_function_single(0, spmi_saw_set_vdd, \
                                        &voltage_sel, true);
}

static struct regulator_ops spmi_saw_ops = {};

static const struct regulator_ops spmi_smps_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_common_set_voltage,
        .set_voltage_time_sel   = spmi_regulator_set_voltage_time_sel,
        .get_voltage_sel        = spmi_regulator_common_get_voltage,
        .map_voltage            = spmi_regulator_common_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
};

static const struct regulator_ops spmi_ldo_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_common_set_voltage,
        .get_voltage_sel        = spmi_regulator_common_get_voltage,
        .map_voltage            = spmi_regulator_common_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_bypass             = spmi_regulator_common_set_bypass,
        .get_bypass             = spmi_regulator_common_get_bypass,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
        .set_soft_start         = spmi_regulator_common_set_soft_start,
};

static const struct regulator_ops spmi_ln_ldo_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_common_set_voltage,
        .get_voltage_sel        = spmi_regulator_common_get_voltage,
        .map_voltage            = spmi_regulator_common_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_bypass             = spmi_regulator_common_set_bypass,
        .get_bypass             = spmi_regulator_common_get_bypass,
};

static const struct regulator_ops spmi_vs_ops = {
        .enable                 = spmi_regulator_vs_enable,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
        .set_soft_start         = spmi_regulator_common_set_soft_start,
        .set_over_current_protection = spmi_regulator_vs_ocp,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
};

static const struct regulator_ops spmi_boost_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_single_range_set_voltage,
        .get_voltage_sel        = spmi_regulator_single_range_get_voltage,
        .map_voltage            = spmi_regulator_single_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_input_current_limit = spmi_regulator_set_ilim,
};

static const struct regulator_ops spmi_ftsmps_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_common_set_voltage,
        .set_voltage_time_sel   = spmi_regulator_set_voltage_time_sel,
        .get_voltage_sel        = spmi_regulator_common_get_voltage,
        .map_voltage            = spmi_regulator_common_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
};

static const struct regulator_ops spmi_ult_lo_smps_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_ult_lo_smps_set_voltage,
        .set_voltage_time_sel   = spmi_regulator_set_voltage_time_sel,
        .get_voltage_sel        = spmi_regulator_ult_lo_smps_get_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
};

static const struct regulator_ops spmi_ult_ho_smps_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_single_range_set_voltage,
        .set_voltage_time_sel   = spmi_regulator_set_voltage_time_sel,
        .get_voltage_sel        = spmi_regulator_single_range_get_voltage,
        .map_voltage            = spmi_regulator_single_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
};

static const struct regulator_ops spmi_ult_ldo_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_single_range_set_voltage,
        .get_voltage_sel        = spmi_regulator_single_range_get_voltage,
        .map_voltage            = spmi_regulator_single_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_common_set_mode,
        .get_mode               = spmi_regulator_common_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_bypass             = spmi_regulator_common_set_bypass,
        .get_bypass             = spmi_regulator_common_get_bypass,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
        .set_soft_start         = spmi_regulator_common_set_soft_start,
};

static const struct regulator_ops spmi_ftsmps426_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_ftsmps426_set_voltage,
        .set_voltage_time_sel   = spmi_regulator_set_voltage_time_sel,
        .get_voltage_sel        = spmi_regulator_ftsmps426_get_voltage,
        .map_voltage            = spmi_regulator_single_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_ftsmps426_set_mode,
        .get_mode               = spmi_regulator_ftsmps426_get_mode,
        .set_load               = spmi_regulator_common_set_load,
        .set_pull_down          = spmi_regulator_common_set_pull_down,
};

static const struct regulator_ops spmi_hfs430_ops = {
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .is_enabled             = regulator_is_enabled_regmap,
        .set_voltage_sel        = spmi_regulator_ftsmps426_set_voltage,
        .set_voltage_time_sel   = spmi_regulator_set_voltage_time_sel,
        .get_voltage_sel        = spmi_regulator_ftsmps426_get_voltage,
        .map_voltage            = spmi_regulator_single_map_voltage,
        .list_voltage           = spmi_regulator_common_list_voltage,
        .set_mode               = spmi_regulator_ftsmps426_set_mode,
        .get_mode               = spmi_regulator_ftsmps426_get_mode,
};

/* Maximum possible digital major revision value */
#define INF 0xFF

static const struct spmi_regulator_mapping supported_regulators[] = {
        /*           type subtype dig_min dig_max ltype ops setpoints hpm_min */
        SPMI_VREG(BUCK,  GP_CTL,   0, INF, SMPS,   smps,   smps,   100000),
        SPMI_VREG(BUCK,  HFS430,   0, INF, HFS430, hfs430, hfs430,  10000),
        SPMI_VREG(LDO,   N300,     0, INF, LDO,    ldo,    nldo1,   10000),
        SPMI_VREG(LDO,   N600,     0,   0, LDO,    ldo,    nldo2,   10000),
        SPMI_VREG(LDO,   N1200,    0,   0, LDO,    ldo,    nldo2,   10000),
        SPMI_VREG(LDO,   N600,     1, INF, LDO,    ldo,    nldo3,   10000),
        SPMI_VREG(LDO,   N1200,    1, INF, LDO,    ldo,    nldo3,   10000),
        SPMI_VREG(LDO,   N600_ST,  0,   0, LDO,    ldo,    nldo2,   10000),
        SPMI_VREG(LDO,   N1200_ST, 0,   0, LDO,    ldo,    nldo2,   10000),
        SPMI_VREG(LDO,   N600_ST,  1, INF, LDO,    ldo,    nldo3,   10000),
        SPMI_VREG(LDO,   N1200_ST, 1, INF, LDO,    ldo,    nldo3,   10000),
        SPMI_VREG(LDO,   P50,      0, INF, LDO,    ldo,    pldo,     5000),
        SPMI_VREG(LDO,   P150,     0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   P300,     0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   P600,     0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   P1200,    0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   LN,       0, INF, LN_LDO, ln_ldo, ln_ldo,      0),
        SPMI_VREG(LDO,   LV_P50,   0, INF, LDO,    ldo,    pldo,     5000),
        SPMI_VREG(LDO,   LV_P150,  0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   LV_P300,  0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   LV_P600,  0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO,   LV_P1200, 0, INF, LDO,    ldo,    pldo,    10000),
        SPMI_VREG(LDO, HT_N300_ST,   0, INF, FTSMPS426, ftsmps426,
                                                        ht_nldo,   30000),
        SPMI_VREG(LDO, HT_N600_ST,   0, INF, FTSMPS426, ftsmps426,
                                                        ht_nldo,   30000),
        SPMI_VREG(LDO, HT_N1200_ST,  0, INF, FTSMPS426, ftsmps426,
                                                        ht_nldo,   30000),
        SPMI_VREG(LDO, HT_LVP150,    0, INF, FTSMPS426, ftsmps426,
                                                        ht_lvpldo, 10000),
        SPMI_VREG(LDO, HT_LVP300,    0, INF, FTSMPS426, ftsmps426,
                                                        ht_lvpldo, 10000),
        SPMI_VREG(LDO, L660_N300_ST, 0, INF, FTSMPS426, ftsmps426,
                                                        nldo660,   10000),
        SPMI_VREG(LDO, L660_N600_ST, 0, INF, FTSMPS426, ftsmps426,
                                                        nldo660,   10000),
        SPMI_VREG(LDO, L660_P50,     0, INF, FTSMPS426, ftsmps426,
                                                        pldo660,   10000),
        SPMI_VREG(LDO, L660_P150,    0, INF, FTSMPS426, ftsmps426,
                                                        pldo660,   10000),
        SPMI_VREG(LDO, L660_P600,    0, INF, FTSMPS426, ftsmps426,
                                                        pldo660,   10000),
        SPMI_VREG(LDO, L660_LVP150,  0, INF, FTSMPS426, ftsmps426,
                                                        ht_lvpldo, 10000),
        SPMI_VREG(LDO, L660_LVP600,  0, INF, FTSMPS426, ftsmps426,
                                                        ht_lvpldo, 10000),
        SPMI_VREG_VS(LV100,        0, INF),
        SPMI_VREG_VS(LV300,        0, INF),
        SPMI_VREG_VS(MV300,        0, INF),
        SPMI_VREG_VS(MV500,        0, INF),
        SPMI_VREG_VS(HDMI,         0, INF),
        SPMI_VREG_VS(OTG,          0, INF),
        SPMI_VREG(BOOST, 5V_BOOST, 0, INF, BOOST,  boost,  boost,       0),
        SPMI_VREG(FTS,   FTS_CTL,  0, INF, FTSMPS, ftsmps, ftsmps, 100000),
        SPMI_VREG(FTS, FTS2p5_CTL, 0, INF, FTSMPS, ftsmps, ftsmps2p5, 100000),
        SPMI_VREG(FTS, FTS426_CTL, 0, INF, FTSMPS426, ftsmps426, ftsmps426, 100000),
        SPMI_VREG(BOOST_BYP, BB_2A, 0, INF, BOOST_BYP, boost, boost_byp, 0),
        SPMI_VREG(ULT_BUCK, ULT_HF_CTL1, 0, INF, ULT_LO_SMPS, ult_lo_smps,
                                                ult_lo_smps,   100000),
        SPMI_VREG(ULT_BUCK, ULT_HF_CTL2, 0, INF, ULT_LO_SMPS, ult_lo_smps,
                                                ult_lo_smps,   100000),
        SPMI_VREG(ULT_BUCK, ULT_HF_CTL3, 0, INF, ULT_LO_SMPS, ult_lo_smps,
                                                ult_lo_smps,   100000),
        SPMI_VREG(ULT_BUCK, ULT_HF_CTL4, 0, INF, ULT_HO_SMPS, ult_ho_smps,
                                                ult_ho_smps,   100000),
        SPMI_VREG(ULT_LDO, N300_ST, 0, INF, ULT_LDO, ult_ldo, ult_nldo, 10000),
        SPMI_VREG(ULT_LDO, N600_ST, 0, INF, ULT_LDO, ult_ldo, ult_nldo, 10000),
        SPMI_VREG(ULT_LDO, N900_ST, 0, INF, ULT_LDO, ult_ldo, ult_nldo, 10000),
        SPMI_VREG(ULT_LDO, N1200_ST, 0, INF, ULT_LDO, ult_ldo, ult_nldo, 10000),
        SPMI_VREG(ULT_LDO, LV_P50,   0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, LV_P150,  0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, LV_P300,  0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, LV_P450,  0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, P600,     0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, P300,     0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, P150,     0, INF, ULT_LDO, ult_ldo, ult_pldo, 10000),
        SPMI_VREG(ULT_LDO, P50,     0, INF, ULT_LDO, ult_ldo, ult_pldo, 5000),
};

static void spmi_calculate_num_voltages(struct spmi_voltage_set_points *points)
{
        unsigned int n;
        struct spmi_voltage_range *range = points->range;

        for (; range < points->range + points->count; range++) {
                n = 0;
                if (range->set_point_max_uV) {
                        n = range->set_point_max_uV - range->set_point_min_uV;
                        n = (n / range->step_uV) + 1;
                }
                range->n_voltages = n;
                points->n_voltages += n;
        }
}

static int spmi_regulator_match(struct spmi_regulator *vreg, u16 force_type)
{
        const struct spmi_regulator_mapping *mapping;
        int ret, i;
        u32 dig_major_rev;
        u8 version[SPMI_COMMON_REG_SUBTYPE - SPMI_COMMON_REG_DIG_MAJOR_REV + 1];
        u8 type, subtype;

        ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_DIG_MAJOR_REV, version,
                ARRAY_SIZE(version));
        if (ret) {
                dev_dbg(vreg->dev, "could not read version registers\n");
                return ret;
        }
        dig_major_rev   = version[SPMI_COMMON_REG_DIG_MAJOR_REV
                                        - SPMI_COMMON_REG_DIG_MAJOR_REV];

        if (!force_type) {
                type            = version[SPMI_COMMON_REG_TYPE -
                                          SPMI_COMMON_REG_DIG_MAJOR_REV];
                subtype         = version[SPMI_COMMON_REG_SUBTYPE -
                                          SPMI_COMMON_REG_DIG_MAJOR_REV];
        } else {
                type = force_type >> 8;
                subtype = force_type;
        }

        for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
                mapping = &supported_regulators[i];
                if (mapping->type == type && mapping->subtype == subtype
                    && mapping->revision_min <= dig_major_rev
                    && mapping->revision_max >= dig_major_rev)
                        goto found;
        }

        dev_err(vreg->dev,
                "unsupported regulator: name=%s type=0x%02X, subtype=0x%02X, dig major rev=0x%02X\n",
                vreg->desc.name, type, subtype, dig_major_rev);

        return -ENODEV;

found:
        vreg->logical_type      = mapping->logical_type;
        vreg->set_points        = mapping->set_points;
        vreg->hpm_min_load      = mapping->hpm_min_load;
        vreg->desc.ops          = mapping->ops;

        if (mapping->set_points) {
                if (!mapping->set_points->n_voltages)
                        spmi_calculate_num_voltages(mapping->set_points);
                vreg->desc.n_voltages = mapping->set_points->n_voltages;
        }

        return 0;
}

static int spmi_regulator_init_slew_rate(struct spmi_regulator *vreg)
{
        int ret;
        u8 reg = 0;
        int step, delay, slew_rate, step_delay;
        const struct spmi_voltage_range *range;

        ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_STEP_CTRL, &reg, 1);
        if (ret) {
                dev_err(vreg->dev, "spmi read failed, ret=%d\n", ret);
                return ret;
        }

        range = spmi_regulator_find_range(vreg);
        if (!range)
                return -EINVAL;

        switch (vreg->logical_type) {
        case SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS:
                step_delay = SPMI_FTSMPS_STEP_DELAY;
                break;
        default:
                step_delay = SPMI_DEFAULT_STEP_DELAY;
                break;
        }

        step = reg & SPMI_FTSMPS_STEP_CTRL_STEP_MASK;
        step >>= SPMI_FTSMPS_STEP_CTRL_STEP_SHIFT;

        delay = reg & SPMI_FTSMPS_STEP_CTRL_DELAY_MASK;
        delay >>= SPMI_FTSMPS_STEP_CTRL_DELAY_SHIFT;

        /* slew_rate has units of uV/us */
        slew_rate = SPMI_FTSMPS_CLOCK_RATE * range->step_uV * (1 << step);
        slew_rate /= 1000 * (step_delay << delay);
        slew_rate *= SPMI_FTSMPS_STEP_MARGIN_NUM;
        slew_rate /= SPMI_FTSMPS_STEP_MARGIN_DEN;

        /* Ensure that the slew rate is greater than 0 */
        vreg->slew_rate = max(slew_rate, 1);

        return ret;
}

static int spmi_regulator_init_slew_rate_ftsmps426(struct spmi_regulator *vreg,
                                                   int clock_rate)
{
        int ret;
        u8 reg = 0;
        int delay, slew_rate;
        const struct spmi_voltage_range *range = &vreg->set_points->range[0];

        ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_STEP_CTRL, &reg, 1);
        if (ret) {
                dev_err(vreg->dev, "spmi read failed, ret=%d\n", ret);
                return ret;
        }

        delay = reg & SPMI_FTSMPS426_STEP_CTRL_DELAY_MASK;
        delay >>= SPMI_FTSMPS426_STEP_CTRL_DELAY_SHIFT;

        /* slew_rate has units of uV/us */
        slew_rate = clock_rate * range->step_uV;
        slew_rate /= 1000 * (SPMI_FTSMPS426_STEP_DELAY << delay);
        slew_rate *= SPMI_FTSMPS426_STEP_MARGIN_NUM;
        slew_rate /= SPMI_FTSMPS426_STEP_MARGIN_DEN;

        /* Ensure that the slew rate is greater than 0 */
        vreg->slew_rate = max(slew_rate, 1);

        return ret;
}

static int spmi_regulator_init_registers(struct spmi_regulator *vreg,
                                const struct spmi_regulator_init_data *data)
{
        int ret;
        enum spmi_regulator_logical_type type;
        u8 ctrl_reg[8], reg, mask;

        type = vreg->logical_type;

        ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_RANGE, ctrl_reg, 8);
        if (ret)
                return ret;

        /* Set up enable pin control. */
        if (!(data->pin_ctrl_enable & SPMI_REGULATOR_PIN_CTRL_ENABLE_HW_DEFAULT)) {
                switch (type) {
                case SPMI_REGULATOR_LOGICAL_TYPE_SMPS:
                case SPMI_REGULATOR_LOGICAL_TYPE_LDO:
                case SPMI_REGULATOR_LOGICAL_TYPE_VS:
                        ctrl_reg[SPMI_COMMON_IDX_ENABLE] &=
                                ~SPMI_COMMON_ENABLE_FOLLOW_ALL_MASK;
                        ctrl_reg[SPMI_COMMON_IDX_ENABLE] |=
                                data->pin_ctrl_enable & SPMI_COMMON_ENABLE_FOLLOW_ALL_MASK;
                        break;
                default:
                        break;
                }
        }

        /* Set up mode pin control. */
        if (!(data->pin_ctrl_hpm & SPMI_REGULATOR_PIN_CTRL_HPM_HW_DEFAULT)) {
                switch (type) {
                case SPMI_REGULATOR_LOGICAL_TYPE_SMPS:
                case SPMI_REGULATOR_LOGICAL_TYPE_LDO:
                        ctrl_reg[SPMI_COMMON_IDX_MODE] &=
                                ~SPMI_COMMON_MODE_FOLLOW_ALL_MASK;
                        ctrl_reg[SPMI_COMMON_IDX_MODE] |=
                                data->pin_ctrl_hpm & SPMI_COMMON_MODE_FOLLOW_ALL_MASK;
                        break;
                case SPMI_REGULATOR_LOGICAL_TYPE_VS:
                case SPMI_REGULATOR_LOGICAL_TYPE_ULT_LO_SMPS:
                case SPMI_REGULATOR_LOGICAL_TYPE_ULT_HO_SMPS:
                case SPMI_REGULATOR_LOGICAL_TYPE_ULT_LDO:
                        ctrl_reg[SPMI_COMMON_IDX_MODE] &=
                                ~SPMI_COMMON_MODE_FOLLOW_AWAKE_MASK;
                        ctrl_reg[SPMI_COMMON_IDX_MODE] |=
                                data->pin_ctrl_hpm & SPMI_COMMON_MODE_FOLLOW_AWAKE_MASK;
                        break;
                default:
                        break;
                }
        }

        /* Write back any control register values that were modified. */
        ret = spmi_vreg_write(vreg, SPMI_COMMON_REG_VOLTAGE_RANGE, ctrl_reg, 8);
        if (ret)
                return ret;

        /* Set soft start strength and over current protection for VS. */
        if (type == SPMI_REGULATOR_LOGICAL_TYPE_VS) {
                if (data->vs_soft_start_strength
                                != SPMI_VS_SOFT_START_STR_HW_DEFAULT) {
                        reg = data->vs_soft_start_strength
                                & SPMI_VS_SOFT_START_SEL_MASK;
                        mask = SPMI_VS_SOFT_START_SEL_MASK;
                        return spmi_vreg_update_bits(vreg,
                                                     SPMI_VS_REG_SOFT_START,
                                                     reg, mask);
                }
        }

        return 0;
}

static void spmi_regulator_get_dt_config(struct spmi_regulator *vreg,
                struct device_node *node, struct spmi_regulator_init_data *data)
{
        /*
         * Initialize configuration parameters to use hardware default in case
         * no value is specified via device tree.
         */
        data->pin_ctrl_enable       = SPMI_REGULATOR_PIN_CTRL_ENABLE_HW_DEFAULT;
        data->pin_ctrl_hpm          = SPMI_REGULATOR_PIN_CTRL_HPM_HW_DEFAULT;
        data->vs_soft_start_strength    = SPMI_VS_SOFT_START_STR_HW_DEFAULT;

        /* These bindings are optional, so it is okay if they aren't found. */
        of_property_read_u32(node, "qcom,ocp-max-retries",
                &vreg->ocp_max_retries);
        of_property_read_u32(node, "qcom,ocp-retry-delay",
                &vreg->ocp_retry_delay_ms);
        of_property_read_u32(node, "qcom,pin-ctrl-enable",
                &data->pin_ctrl_enable);
        of_property_read_u32(node, "qcom,pin-ctrl-hpm", &data->pin_ctrl_hpm);
        of_property_read_u32(node, "qcom,vs-soft-start-strength",
                &data->vs_soft_start_strength);
}

static unsigned int spmi_regulator_of_map_mode(unsigned int mode)
{
        if (mode == 1)
                return REGULATOR_MODE_NORMAL;
        if (mode == 2)
                return REGULATOR_MODE_FAST;

        return REGULATOR_MODE_IDLE;
}

static int spmi_regulator_of_parse(struct device_node *node,
                            const struct regulator_desc *desc,
                            struct regulator_config *config)
{
        struct spmi_regulator_init_data data = { };
        struct spmi_regulator *vreg = config->driver_data;
        struct device *dev = config->dev;
        int ret;

        spmi_regulator_get_dt_config(vreg, node, &data);

        if (!vreg->ocp_max_retries)
                vreg->ocp_max_retries = SPMI_VS_OCP_DEFAULT_MAX_RETRIES;
        if (!vreg->ocp_retry_delay_ms)
                vreg->ocp_retry_delay_ms = SPMI_VS_OCP_DEFAULT_RETRY_DELAY_MS;

        ret = spmi_regulator_init_registers(vreg, &data);
        if (ret) {
                dev_err(dev, "common initialization failed, ret=%d\n", ret);
                return ret;
        }

        switch (vreg->logical_type) {
        case SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS:
        case SPMI_REGULATOR_LOGICAL_TYPE_ULT_LO_SMPS:
        case SPMI_REGULATOR_LOGICAL_TYPE_ULT_HO_SMPS:
        case SPMI_REGULATOR_LOGICAL_TYPE_SMPS:
                ret = spmi_regulator_init_slew_rate(vreg);
                if (ret)
                        return ret;
                break;
        case SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS426:
                ret = spmi_regulator_init_slew_rate_ftsmps426(vreg,
                                                SPMI_FTSMPS426_CLOCK_RATE);
                if (ret)
                        return ret;
                break;
        case SPMI_REGULATOR_LOGICAL_TYPE_HFS430:
                ret = spmi_regulator_init_slew_rate_ftsmps426(vreg,
                                                        SPMI_HFS430_CLOCK_RATE);
                if (ret)
                        return ret;
                break;
        default:
                break;
        }

        if (vreg->logical_type != SPMI_REGULATOR_LOGICAL_TYPE_VS)
                vreg->ocp_irq = 0;

        if (vreg->ocp_irq) {
                ret = devm_request_irq(dev, vreg->ocp_irq,
                        spmi_regulator_vs_ocp_isr, IRQF_TRIGGER_RISING, "ocp",
                        vreg);
                if (ret < 0) {
                        dev_err(dev, "failed to request irq %d, ret=%d\n",
                                vreg->ocp_irq, ret);
                        return ret;
                }

                ret = devm_delayed_work_autocancel(dev, &vreg->ocp_work,
                                                   spmi_regulator_vs_ocp_work);
                if (ret)
                        return ret;
        }

        return 0;
}

static const struct spmi_regulator_data pm8941_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0xa000, },
        { "l1", 0x4000, "vdd_l1_l3", },
        { "l2", 0x4100, "vdd_l2_lvs_1_2_3", },
        { "l3", 0x4200, "vdd_l1_l3", },
        { "l4", 0x4300, "vdd_l4_l11", },
        { "l5", 0x4400, "vdd_l5_l7", NULL, 0x0410 },
        { "l6", 0x4500, "vdd_l6_l12_l14_l15", },
        { "l7", 0x4600, "vdd_l5_l7", NULL, 0x0410 },
        { "l8", 0x4700, "vdd_l8_l16_l18_19", },
        { "l9", 0x4800, "vdd_l9_l10_l17_l22", },
        { "l10", 0x4900, "vdd_l9_l10_l17_l22", },
        { "l11", 0x4a00, "vdd_l4_l11", },
        { "l12", 0x4b00, "vdd_l6_l12_l14_l15", },
        { "l13", 0x4c00, "vdd_l13_l20_l23_l24", },
        { "l14", 0x4d00, "vdd_l6_l12_l14_l15", },
        { "l15", 0x4e00, "vdd_l6_l12_l14_l15", },
        { "l16", 0x4f00, "vdd_l8_l16_l18_19", },
        { "l17", 0x5000, "vdd_l9_l10_l17_l22", },
        { "l18", 0x5100, "vdd_l8_l16_l18_19", },
        { "l19", 0x5200, "vdd_l8_l16_l18_19", },
        { "l20", 0x5300, "vdd_l13_l20_l23_l24", },
        { "l21", 0x5400, "vdd_l21", },
        { "l22", 0x5500, "vdd_l9_l10_l17_l22", },
        { "l23", 0x5600, "vdd_l13_l20_l23_l24", },
        { "l24", 0x5700, "vdd_l13_l20_l23_l24", },
        { "lvs1", 0x8000, "vdd_l2_lvs_1_2_3", },
        { "lvs2", 0x8100, "vdd_l2_lvs_1_2_3", },
        { "lvs3", 0x8200, "vdd_l2_lvs_1_2_3", },
        { "5vs1", 0x8300, "vin_5vs", "ocp-5vs1", },
        { "5vs2", 0x8400, "vin_5vs", "ocp-5vs2", },
        { }
};

static const struct spmi_regulator_data pm8841_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", NULL, 0x1c08 },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s4", NULL, 0x1c08 },
        { "s5", 0x2000, "vdd_s5", NULL, 0x1c08 },
        { "s6", 0x2300, "vdd_s6", NULL, 0x1c08 },
        { "s7", 0x2600, "vdd_s7", NULL, 0x1c08 },
        { "s8", 0x2900, "vdd_s8", NULL, 0x1c08 },
        { }
};

static const struct spmi_regulator_data pm8916_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s4", },
        { "l1", 0x4000, "vdd_l1_l3", },
        { "l2", 0x4100, "vdd_l2", },
        { "l3", 0x4200, "vdd_l1_l3", },
        { "l4", 0x4300, "vdd_l4_l5_l6", },
        { "l5", 0x4400, "vdd_l4_l5_l6", },
        { "l6", 0x4500, "vdd_l4_l5_l6", },
        { "l7", 0x4600, "vdd_l7", },
        { "l8", 0x4700, "vdd_l8_l11_l14_l15_l16", },
        { "l9", 0x4800, "vdd_l9_l10_l12_l13_l17_l18", },
        { "l10", 0x4900, "vdd_l9_l10_l12_l13_l17_l18", },
        { "l11", 0x4a00, "vdd_l8_l11_l14_l15_l16", },
        { "l12", 0x4b00, "vdd_l9_l10_l12_l13_l17_l18", },
        { "l13", 0x4c00, "vdd_l9_l10_l12_l13_l17_l18", },
        { "l14", 0x4d00, "vdd_l8_l11_l14_l15_l16", },
        { "l15", 0x4e00, "vdd_l8_l11_l14_l15_l16", },
        { "l16", 0x4f00, "vdd_l8_l11_l14_l15_l16", },
        { "l17", 0x5000, "vdd_l9_l10_l12_l13_l17_l18", },
        { "l18", 0x5100, "vdd_l9_l10_l12_l13_l17_l18", },
        { }
};

static const struct spmi_regulator_data pm8950_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s4", },
        { "s5", 0x2000, "vdd_s5", },
        { "s6", 0x2300, "vdd_s6", },
        { "l1", 0x4000, "vdd_l1_l19", },
        { "l2", 0x4100, "vdd_l2_l23", },
        { "l3", 0x4200, "vdd_l3", },
        { "l4", 0x4300, "vdd_l4_l5_l6_l7_l16", },
        { "l5", 0x4400, "vdd_l4_l5_l6_l7_l16", },
        { "l6", 0x4500, "vdd_l4_l5_l6_l7_l16", },
        { "l7", 0x4600, "vdd_l4_l5_l6_l7_l16", },
        { "l8", 0x4700, "vdd_l8_l11_l12_l17_l22", },
        { "l9", 0x4800, "vdd_l9_l10_l13_l14_l15_l18", },
        { "l10", 0x4900, "vdd_l9_l10_l13_l14_l15_l18", },
        { "l11", 0x4a00, "vdd_l8_l11_l12_l17_l22", },
        { "l12", 0x4b00, "vdd_l8_l11_l12_l17_l22", },
        { "l13", 0x4c00, "vdd_l9_l10_l13_l14_l15_l18", },
        { "l14", 0x4d00, "vdd_l9_l10_l13_l14_l15_l18", },
        { "l15", 0x4e00, "vdd_l9_l10_l13_l14_l15_l18", },
        { "l16", 0x4f00, "vdd_l4_l5_l6_l7_l16", },
        { "l17", 0x5000, "vdd_l8_l11_l12_l17_l22", },
        { "l18", 0x5100, "vdd_l9_l10_l13_l14_l15_l18", },
        { "l19", 0x5200, "vdd_l1_l19", },
        { "l20", 0x5300, "vdd_l20", },
        { "l21", 0x5400, "vdd_l21", },
        { "l22", 0x5500, "vdd_l8_l11_l12_l17_l22", },
        { "l23", 0x5600, "vdd_l2_l23", },
        { }
};

static const struct spmi_regulator_data pm8994_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s4", },
        { "s5", 0x2000, "vdd_s5", },
        { "s6", 0x2300, "vdd_s6", },
        { "s7", 0x2600, "vdd_s7", },
        { "s8", 0x2900, "vdd_s8", },
        { "s9", 0x2c00, "vdd_s9", },
        { "s10", 0x2f00, "vdd_s10", },
        { "s11", 0x3200, "vdd_s11", },
        { "s12", 0x3500, "vdd_s12", },
        { "l1", 0x4000, "vdd_l1", },
        { "l2", 0x4100, "vdd_l2_l26_l28", },
        { "l3", 0x4200, "vdd_l3_l11", },
        { "l4", 0x4300, "vdd_l4_l27_l31", },
        { "l5", 0x4400, "vdd_l5_l7", },
        { "l6", 0x4500, "vdd_l6_l12_l32", },
        { "l7", 0x4600, "vdd_l5_l7", },
        { "l8", 0x4700, "vdd_l8_l16_l30", },
        { "l9", 0x4800, "vdd_l9_l10_l18_l22", },
        { "l10", 0x4900, "vdd_l9_l10_l18_l22", },
        { "l11", 0x4a00, "vdd_l3_l11", },
        { "l12", 0x4b00, "vdd_l6_l12_l32", },
        { "l13", 0x4c00, "vdd_l13_l19_l23_l24", },
        { "l14", 0x4d00, "vdd_l14_l15", },
        { "l15", 0x4e00, "vdd_l14_l15", },
        { "l16", 0x4f00, "vdd_l8_l16_l30", },
        { "l17", 0x5000, "vdd_l17_l29", },
        { "l18", 0x5100, "vdd_l9_l10_l18_l22", },
        { "l19", 0x5200, "vdd_l13_l19_l23_l24", },

        { "l20", 0x5300, "vdd_l20_l21", },
        { "l21", 0x5400, "vdd_l20_l21", },
        { "l22", 0x5500, "vdd_l9_l10_l18_l22", },
        { "l23", 0x5600, "vdd_l13_l19_l23_l24", },
        { "l24", 0x5700, "vdd_l13_l19_l23_l24", },
        { "l25", 0x5800, "vdd_l25", },
        { "l26", 0x5900, "vdd_l2_l26_l28", },
        { "l27", 0x5a00, "vdd_l4_l27_l31", },
        { "l28", 0x5b00, "vdd_l2_l26_l28", },
        { "l29", 0x5c00, "vdd_l17_l29", },
        { "l30", 0x5d00, "vdd_l8_l16_l30", },
        { "l31", 0x5e00, "vdd_l4_l27_l31", },
        { "l32", 0x5f00, "vdd_l6_l12_l32", },
        { "lvs1", 0x8000, "vdd_lvs_1_2", },
        { "lvs2", 0x8100, "vdd_lvs_1_2", },
        { }
};

static const struct spmi_regulator_data pmi8994_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "l1", 0x4000, "vdd_l1", },
        { }
};

static const struct spmi_regulator_data pm660_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s3", },
        { "s5", 0x2000, "vdd_s5", },
        { "s6", 0x2300, "vdd_s6", },
        { "l1", 0x4000, "vdd_l1_l6_l7", },
        { "l2", 0x4100, "vdd_l2_l3", },
        { "l3", 0x4200, "vdd_l2_l3", },
        /* l4 is unaccessible on PM660 */
        { "l5", 0x4400, "vdd_l5", },
        { "l6", 0x4500, "vdd_l1_l6_l7", },
        { "l7", 0x4600, "vdd_l1_l6_l7", },
        { "l8", 0x4700, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l9", 0x4800, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l10", 0x4900, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l11", 0x4a00, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l12", 0x4b00, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l13", 0x4c00, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l14", 0x4d00, "vdd_l8_l9_l10_l11_l12_l13_l14", },
        { "l15", 0x4e00, "vdd_l15_l16_l17_l18_l19", },
        { "l16", 0x4f00, "vdd_l15_l16_l17_l18_l19", },
        { "l17", 0x5000, "vdd_l15_l16_l17_l18_l19", },
        { "l18", 0x5100, "vdd_l15_l16_l17_l18_l19", },
        { "l19", 0x5200, "vdd_l15_l16_l17_l18_l19", },
        { }
};

static const struct spmi_regulator_data pm660l_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s4", },
        { "s5", 0x2000, "vdd_s5", },
        { "l1", 0x4000, "vdd_l1_l9_l10", },
        { "l2", 0x4100, "vdd_l2", },
        { "l3", 0x4200, "vdd_l3_l5_l7_l8", },
        { "l4", 0x4300, "vdd_l4_l6", },
        { "l5", 0x4400, "vdd_l3_l5_l7_l8", },
        { "l6", 0x4500, "vdd_l4_l6", },
        { "l7", 0x4600, "vdd_l3_l5_l7_l8", },
        { "l8", 0x4700, "vdd_l3_l5_l7_l8", },
        { "l9", 0x4800, "vdd_l1_l9_l10", },
        { "l10", 0x4900, "vdd_l1_l9_l10", },
        { }
};


static const struct spmi_regulator_data pm8004_regulators[] = {
        { "s2", 0x1700, "vdd_s2", },
        { "s5", 0x2000, "vdd_s5", },
        { }
};

static const struct spmi_regulator_data pm8005_regulators[] = {
        { "s1", 0x1400, "vdd_s1", },
        { "s2", 0x1700, "vdd_s2", },
        { "s3", 0x1a00, "vdd_s3", },
        { "s4", 0x1d00, "vdd_s4", },
        { }
};

static const struct spmi_regulator_data pms405_regulators[] = {
        { "s3", 0x1a00, "vdd_s3"},
        { }
};

static const struct of_device_id qcom_spmi_regulator_match[] = {
        { .compatible = "qcom,pm8004-regulators", .data = &pm8004_regulators },
        { .compatible = "qcom,pm8005-regulators", .data = &pm8005_regulators },
        { .compatible = "qcom,pm8841-regulators", .data = &pm8841_regulators },
        { .compatible = "qcom,pm8916-regulators", .data = &pm8916_regulators },
        { .compatible = "qcom,pm8941-regulators", .data = &pm8941_regulators },
        { .compatible = "qcom,pm8950-regulators", .data = &pm8950_regulators },
        { .compatible = "qcom,pm8994-regulators", .data = &pm8994_regulators },
        { .compatible = "qcom,pmi8994-regulators", .data = &pmi8994_regulators },
        { .compatible = "qcom,pm660-regulators", .data = &pm660_regulators },
        { .compatible = "qcom,pm660l-regulators", .data = &pm660l_regulators },
        { .compatible = "qcom,pms405-regulators", .data = &pms405_regulators },
        { }
};
MODULE_DEVICE_TABLE(of, qcom_spmi_regulator_match);

static int qcom_spmi_regulator_probe(struct platform_device *pdev)
{
        const struct spmi_regulator_data *reg;
        const struct spmi_voltage_range *range;
        const struct of_device_id *match;
        struct regulator_config config = { };
        struct regulator_dev *rdev;
        struct spmi_regulator *vreg;
        struct regmap *regmap;
        const char *name;
        struct device *dev = &pdev->dev;
        struct device_node *node = pdev->dev.of_node;
        struct device_node *syscon, *reg_node;
        struct property *reg_prop;
        int ret, lenp;
        struct list_head *vreg_list;

        vreg_list = devm_kzalloc(dev, sizeof(*vreg_list), GFP_KERNEL);
        if (!vreg_list)
                return -ENOMEM;
        INIT_LIST_HEAD(vreg_list);
        platform_set_drvdata(pdev, vreg_list);

        regmap = dev_get_regmap(dev->parent, NULL);
        if (!regmap)
                return -ENODEV;

        match = of_match_device(qcom_spmi_regulator_match, &pdev->dev);
        if (!match)
                return -ENODEV;

        if (of_find_property(node, "qcom,saw-reg", &lenp)) {
                syscon = of_parse_phandle(node, "qcom,saw-reg", 0);
                saw_regmap = syscon_node_to_regmap(syscon);
                of_node_put(syscon);
                if (IS_ERR(saw_regmap))
                        dev_err(dev, "ERROR reading SAW regmap\n");
        }

        for (reg = match->data; reg->name; reg++) {

                if (saw_regmap) {
                        reg_node = of_get_child_by_name(node, reg->name);
                        reg_prop = of_find_property(reg_node, "qcom,saw-slave",
                                                    &lenp);
                        of_node_put(reg_node);
                        if (reg_prop)
                                continue;
                }

                vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
                if (!vreg)
                        return -ENOMEM;

                vreg->dev = dev;
                vreg->base = reg->base;
                vreg->regmap = regmap;
                if (reg->ocp) {
                        vreg->ocp_irq = platform_get_irq_byname(pdev, reg->ocp);
                        if (vreg->ocp_irq < 0)
                                return vreg->ocp_irq;
                }
                vreg->desc.id = -1;
                vreg->desc.owner = THIS_MODULE;
                vreg->desc.type = REGULATOR_VOLTAGE;
                vreg->desc.enable_reg = reg->base + SPMI_COMMON_REG_ENABLE;
                vreg->desc.enable_mask = SPMI_COMMON_ENABLE_MASK;
                vreg->desc.enable_val = SPMI_COMMON_ENABLE;
                vreg->desc.name = name = reg->name;
                vreg->desc.supply_name = reg->supply;
                vreg->desc.of_match = reg->name;
                vreg->desc.of_parse_cb = spmi_regulator_of_parse;
                vreg->desc.of_map_mode = spmi_regulator_of_map_mode;

                ret = spmi_regulator_match(vreg, reg->force_type);
                if (ret)
                        continue;

                if (saw_regmap) {
                        reg_node = of_get_child_by_name(node, reg->name);
                        reg_prop = of_find_property(reg_node, "qcom,saw-leader",
                                                    &lenp);
                        of_node_put(reg_node);
                        if (reg_prop) {
                                spmi_saw_ops = *(vreg->desc.ops);
                                spmi_saw_ops.set_voltage_sel =
                                        spmi_regulator_saw_set_voltage;
                                vreg->desc.ops = &spmi_saw_ops;
                        }
                }

                if (vreg->set_points && vreg->set_points->count == 1) {
                        /* since there is only one range */
                        range = vreg->set_points->range;
                        vreg->desc.uV_step = range->step_uV;
                }

                config.dev = dev;
                config.driver_data = vreg;
                config.regmap = regmap;
                rdev = devm_regulator_register(dev, &vreg->desc, &config);
                if (IS_ERR(rdev)) {
                        dev_err(dev, "failed to register %s\n", name);
                        return PTR_ERR(rdev);
                }

                INIT_LIST_HEAD(&vreg->node);
                list_add(&vreg->node, vreg_list);
        }

        return 0;
}

static struct platform_driver qcom_spmi_regulator_driver = {
        .driver         = {
                .name   = "qcom-spmi-regulator",
                .of_match_table = qcom_spmi_regulator_match,
        },
        .probe          = qcom_spmi_regulator_probe,
};
module_platform_driver(qcom_spmi_regulator_driver);

MODULE_DESCRIPTION("Qualcomm SPMI PMIC regulator driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:qcom-spmi-regulator");