linux/drivers/regulator/lp873x-regulator.c
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   1/*
   2 * Regulator driver for LP873X PMIC
   3 *
   4 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11 * kind, whether expressed or implied; without even the implied warranty
  12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License version 2 for more details.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/platform_device.h>
  18#include <linux/regmap.h>
  19
  20#include <linux/mfd/lp873x.h>
  21
  22#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
  23                         _delay, _lr, _cr)                              \
  24        [_id] = {                                                       \
  25                .desc = {                                               \
  26                        .name                   = _name,                \
  27                        .supply_name            = _of "-in",            \
  28                        .id                     = _id,                  \
  29                        .of_match               = of_match_ptr(_of),    \
  30                        .regulators_node        = of_match_ptr("regulators"),\
  31                        .ops                    = &_ops,                \
  32                        .n_voltages             = _n,                   \
  33                        .type                   = REGULATOR_VOLTAGE,    \
  34                        .owner                  = THIS_MODULE,          \
  35                        .vsel_reg               = _vr,                  \
  36                        .vsel_mask              = _vm,                  \
  37                        .enable_reg             = _er,                  \
  38                        .enable_mask            = _em,                  \
  39                        .ramp_delay             = _delay,               \
  40                        .linear_ranges          = _lr,                  \
  41                        .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  42                        .curr_table     = lp873x_buck_uA,               \
  43                        .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \
  44                        .csel_reg       = (_cr),                        \
  45                        .csel_mask      = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
  46                },                                                      \
  47                .ctrl2_reg = _cr,                                       \
  48        }
  49
  50struct lp873x_regulator {
  51        struct regulator_desc desc;
  52        unsigned int ctrl2_reg;
  53};
  54
  55static const struct lp873x_regulator regulators[];
  56
  57static const struct linear_range buck0_buck1_ranges[] = {
  58        REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
  59        REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
  60        REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  61        REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  62};
  63
  64static const struct linear_range ldo0_ldo1_ranges[] = {
  65        REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
  66};
  67
  68static const unsigned int lp873x_buck_ramp_delay[] = {
  69        30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  70};
  71
  72/* LP873X BUCK current limit */
  73static const unsigned int lp873x_buck_uA[] = {
  74        1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
  75};
  76
  77static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
  78                                      int ramp_delay)
  79{
  80        int id = rdev_get_id(rdev);
  81        struct lp873x *lp873 = rdev_get_drvdata(rdev);
  82        unsigned int reg;
  83        int ret;
  84
  85        if (ramp_delay <= 470)
  86                reg = 7;
  87        else if (ramp_delay <= 940)
  88                reg = 6;
  89        else if (ramp_delay <= 1900)
  90                reg = 5;
  91        else if (ramp_delay <= 3800)
  92                reg = 4;
  93        else if (ramp_delay <= 7500)
  94                reg = 3;
  95        else if (ramp_delay <= 10000)
  96                reg = 2;
  97        else if (ramp_delay <= 15000)
  98                reg = 1;
  99        else
 100                reg = 0;
 101
 102        ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
 103                                 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
 104                                 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
 105        if (ret) {
 106                dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 107                return ret;
 108        }
 109
 110        rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
 111
 112        return 0;
 113}
 114
 115/* Operations permitted on BUCK0, BUCK1 */
 116static const struct regulator_ops lp873x_buck01_ops = {
 117        .is_enabled             = regulator_is_enabled_regmap,
 118        .enable                 = regulator_enable_regmap,
 119        .disable                = regulator_disable_regmap,
 120        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 121        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 122        .list_voltage           = regulator_list_voltage_linear_range,
 123        .map_voltage            = regulator_map_voltage_linear_range,
 124        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 125        .set_ramp_delay         = lp873x_buck_set_ramp_delay,
 126        .set_current_limit      = regulator_set_current_limit_regmap,
 127        .get_current_limit      = regulator_get_current_limit_regmap,
 128};
 129
 130/* Operations permitted on LDO0 and LDO1 */
 131static const struct regulator_ops lp873x_ldo01_ops = {
 132        .is_enabled             = regulator_is_enabled_regmap,
 133        .enable                 = regulator_enable_regmap,
 134        .disable                = regulator_disable_regmap,
 135        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 136        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 137        .list_voltage           = regulator_list_voltage_linear_range,
 138        .map_voltage            = regulator_map_voltage_linear_range,
 139};
 140
 141static const struct lp873x_regulator regulators[] = {
 142        LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
 143                         256, LP873X_REG_BUCK0_VOUT,
 144                         LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
 145                         LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
 146                         buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 147        LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
 148                         256, LP873X_REG_BUCK1_VOUT,
 149                         LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
 150                         LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
 151                         buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 152        LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
 153                         LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
 154                         LP873X_REG_LDO0_CTRL,
 155                         LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 156        LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
 157                         LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
 158                         LP873X_REG_LDO1_CTRL,
 159                         LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
 160};
 161
 162static int lp873x_regulator_probe(struct platform_device *pdev)
 163{
 164        struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 165        struct regulator_config config = { };
 166        struct regulator_dev *rdev;
 167        int i;
 168
 169        platform_set_drvdata(pdev, lp873);
 170
 171        config.dev = &pdev->dev;
 172        config.dev->of_node = lp873->dev->of_node;
 173        config.driver_data = lp873;
 174        config.regmap = lp873->regmap;
 175
 176        for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 177                rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 178                                               &config);
 179                if (IS_ERR(rdev)) {
 180                        dev_err(lp873->dev, "failed to register %s regulator\n",
 181                                pdev->name);
 182                        return PTR_ERR(rdev);
 183                }
 184        }
 185
 186        return 0;
 187}
 188
 189static const struct platform_device_id lp873x_regulator_id_table[] = {
 190        { "lp873x-regulator", },
 191        { /* sentinel */ }
 192};
 193MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
 194
 195static struct platform_driver lp873x_regulator_driver = {
 196        .driver = {
 197                .name = "lp873x-pmic",
 198        },
 199        .probe = lp873x_regulator_probe,
 200        .id_table = lp873x_regulator_id_table,
 201};
 202module_platform_driver(lp873x_regulator_driver);
 203
 204MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 205MODULE_DESCRIPTION("LP873X voltage regulator driver");
 206MODULE_ALIAS("platform:lp873x-pmic");
 207MODULE_LICENSE("GPL v2");
 208