linux/drivers/regulator/max77686-regulator.c
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   1/*
   2 * max77686.c - Regulator driver for the Maxim 77686
   3 *
   4 * Copyright (C) 2012 Samsung Electronics
   5 * Chiwoong Byun <woong.byun@samsung.com>
   6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 *
  22 * This driver is based on max8997.c
  23 */
  24
  25#include <linux/kernel.h>
  26#include <linux/bug.h>
  27#include <linux/err.h>
  28#include <linux/gpio.h>
  29#include <linux/of_gpio.h>
  30#include <linux/slab.h>
  31#include <linux/platform_device.h>
  32#include <linux/regulator/driver.h>
  33#include <linux/regulator/machine.h>
  34#include <linux/regulator/of_regulator.h>
  35#include <linux/mfd/max77686.h>
  36#include <linux/mfd/max77686-private.h>
  37
  38#define MAX77686_LDO_MINUV      800000
  39#define MAX77686_LDO_UVSTEP     50000
  40#define MAX77686_LDO_LOW_MINUV  800000
  41#define MAX77686_LDO_LOW_UVSTEP 25000
  42#define MAX77686_BUCK_MINUV     750000
  43#define MAX77686_BUCK_UVSTEP    50000
  44#define MAX77686_BUCK_ENABLE_TIME       40              /* us */
  45#define MAX77686_DVS_ENABLE_TIME        22              /* us */
  46#define MAX77686_RAMP_DELAY     100000                  /* uV/us */
  47#define MAX77686_DVS_RAMP_DELAY 27500                   /* uV/us */
  48#define MAX77686_DVS_MINUV      600000
  49#define MAX77686_DVS_UVSTEP     12500
  50
  51/*
  52 * Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
  53 * It is the same as 'off' for other regulators.
  54 */
  55#define MAX77686_GPIO_CONTROL           0x0
  56/*
  57 * Values used for configuring LDOs and bucks.
  58 * Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
  59 */
  60#define MAX77686_LDO_LOWPOWER           0x1
  61/*
  62 * On/off controlled by PWRREQ:
  63 *  - LDO2, 6-8, 10-12, 14-16
  64 *  - buck[1234]
  65 */
  66#define MAX77686_OFF_PWRREQ             0x1
  67/* Low power mode controlled by PWRREQ: All LDOs */
  68#define MAX77686_LDO_LOWPOWER_PWRREQ    0x2
  69/* Forcing low power mode: buck[234] */
  70#define MAX77686_BUCK_LOWPOWER          0x2
  71#define MAX77686_NORMAL                 0x3
  72
  73#define MAX77686_OPMODE_SHIFT   6
  74#define MAX77686_OPMODE_BUCK234_SHIFT   4
  75#define MAX77686_OPMODE_MASK    0x3
  76
  77#define MAX77686_VSEL_MASK      0x3F
  78#define MAX77686_DVS_VSEL_MASK  0xFF
  79
  80#define MAX77686_RAMP_RATE_MASK 0xC0
  81
  82#define MAX77686_REGULATORS     MAX77686_REG_MAX
  83#define MAX77686_LDOS           26
  84
  85enum max77686_ramp_rate {
  86        RAMP_RATE_13P75MV,
  87        RAMP_RATE_27P5MV,
  88        RAMP_RATE_55MV,
  89        RAMP_RATE_NO_CTRL,      /* 100mV/us */
  90};
  91
  92struct max77686_data {
  93        DECLARE_BITMAP(gpio_enabled, MAX77686_REGULATORS);
  94
  95        /* Array indexed by regulator id */
  96        unsigned int opmode[MAX77686_REGULATORS];
  97};
  98
  99static unsigned int max77686_get_opmode_shift(int id)
 100{
 101        switch (id) {
 102        case MAX77686_BUCK1:
 103        case MAX77686_BUCK5 ... MAX77686_BUCK9:
 104                return 0;
 105        case MAX77686_BUCK2 ... MAX77686_BUCK4:
 106                return MAX77686_OPMODE_BUCK234_SHIFT;
 107        default:
 108                /* all LDOs */
 109                return MAX77686_OPMODE_SHIFT;
 110        }
 111}
 112
 113/*
 114 * When regulator is configured for GPIO control then it
 115 * replaces "normal" mode. Any change from low power mode to normal
 116 * should actually change to GPIO control.
 117 * Map normal mode to proper value for such regulators.
 118 */
 119static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
 120                                             int id)
 121{
 122        switch (id) {
 123        case MAX77686_BUCK8:
 124        case MAX77686_BUCK9:
 125        case MAX77686_LDO20 ... MAX77686_LDO22:
 126                if (test_bit(id, max77686->gpio_enabled))
 127                        return MAX77686_GPIO_CONTROL;
 128        }
 129
 130        return MAX77686_NORMAL;
 131}
 132
 133/* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
 134static int max77686_set_suspend_disable(struct regulator_dev *rdev)
 135{
 136        unsigned int val, shift;
 137        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 138        int ret, id = rdev_get_id(rdev);
 139
 140        shift = max77686_get_opmode_shift(id);
 141        val = MAX77686_OFF_PWRREQ;
 142
 143        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 144                                 rdev->desc->enable_mask, val << shift);
 145        if (ret)
 146                return ret;
 147
 148        max77686->opmode[id] = val;
 149        return 0;
 150}
 151
 152/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
 153static int max77686_set_suspend_mode(struct regulator_dev *rdev,
 154                                     unsigned int mode)
 155{
 156        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 157        unsigned int val;
 158        int ret, id = rdev_get_id(rdev);
 159
 160        /* BUCK[5-9] doesn't support this feature */
 161        if (id >= MAX77686_BUCK5)
 162                return 0;
 163
 164        switch (mode) {
 165        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 166                val = MAX77686_LDO_LOWPOWER_PWRREQ;
 167                break;
 168        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 169                val = max77686_map_normal_mode(max77686, id);
 170                break;
 171        default:
 172                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 173                        rdev->desc->name, mode);
 174                return -EINVAL;
 175        }
 176
 177        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 178                                  rdev->desc->enable_mask,
 179                                  val << MAX77686_OPMODE_SHIFT);
 180        if (ret)
 181                return ret;
 182
 183        max77686->opmode[id] = val;
 184        return 0;
 185}
 186
 187/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
 188static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
 189                                     unsigned int mode)
 190{
 191        unsigned int val;
 192        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 193        int ret, id = rdev_get_id(rdev);
 194
 195        switch (mode) {
 196        case REGULATOR_MODE_STANDBY:                    /* switch off */
 197                val = MAX77686_OFF_PWRREQ;
 198                break;
 199        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 200                val = MAX77686_LDO_LOWPOWER_PWRREQ;
 201                break;
 202        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 203                val = max77686_map_normal_mode(max77686, id);
 204                break;
 205        default:
 206                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 207                        rdev->desc->name, mode);
 208                return -EINVAL;
 209        }
 210
 211        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 212                                 rdev->desc->enable_mask,
 213                                 val << MAX77686_OPMODE_SHIFT);
 214        if (ret)
 215                return ret;
 216
 217        max77686->opmode[id] = val;
 218        return 0;
 219}
 220
 221static int max77686_enable(struct regulator_dev *rdev)
 222{
 223        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 224        unsigned int shift;
 225        int id = rdev_get_id(rdev);
 226
 227        shift = max77686_get_opmode_shift(id);
 228
 229        if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
 230                max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
 231
 232        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 233                                  rdev->desc->enable_mask,
 234                                  max77686->opmode[id] << shift);
 235}
 236
 237static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 238{
 239        unsigned int ramp_value = RAMP_RATE_NO_CTRL;
 240
 241        switch (ramp_delay) {
 242        case 1 ... 13750:
 243                ramp_value = RAMP_RATE_13P75MV;
 244                break;
 245        case 13751 ... 27500:
 246                ramp_value = RAMP_RATE_27P5MV;
 247                break;
 248        case 27501 ... 55000:
 249                ramp_value = RAMP_RATE_55MV;
 250                break;
 251        case 55001 ... 100000:
 252                break;
 253        default:
 254                pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
 255                        rdev->desc->name, ramp_delay);
 256        }
 257
 258        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 259                                  MAX77686_RAMP_RATE_MASK, ramp_value << 6);
 260}
 261
 262static int max77686_of_parse_cb(struct device_node *np,
 263                const struct regulator_desc *desc,
 264                struct regulator_config *config)
 265{
 266        struct max77686_data *max77686 = config->driver_data;
 267
 268        switch (desc->id) {
 269        case MAX77686_BUCK8:
 270        case MAX77686_BUCK9:
 271        case MAX77686_LDO20 ... MAX77686_LDO22:
 272                config->ena_gpio = of_get_named_gpio(np,
 273                                        "maxim,ena-gpios", 0);
 274                config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
 275                config->ena_gpio_initialized = true;
 276                break;
 277        default:
 278                return 0;
 279        }
 280
 281        if (gpio_is_valid(config->ena_gpio)) {
 282                set_bit(desc->id, max77686->gpio_enabled);
 283
 284                return regmap_update_bits(config->regmap, desc->enable_reg,
 285                                          desc->enable_mask,
 286                                          MAX77686_GPIO_CONTROL);
 287        }
 288
 289        return 0;
 290}
 291
 292static struct regulator_ops max77686_ops = {
 293        .list_voltage           = regulator_list_voltage_linear,
 294        .map_voltage            = regulator_map_voltage_linear,
 295        .is_enabled             = regulator_is_enabled_regmap,
 296        .enable                 = max77686_enable,
 297        .disable                = regulator_disable_regmap,
 298        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 299        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 300        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 301        .set_suspend_mode       = max77686_set_suspend_mode,
 302};
 303
 304static struct regulator_ops max77686_ldo_ops = {
 305        .list_voltage           = regulator_list_voltage_linear,
 306        .map_voltage            = regulator_map_voltage_linear,
 307        .is_enabled             = regulator_is_enabled_regmap,
 308        .enable                 = max77686_enable,
 309        .disable                = regulator_disable_regmap,
 310        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 311        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 312        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 313        .set_suspend_mode       = max77686_ldo_set_suspend_mode,
 314        .set_suspend_disable    = max77686_set_suspend_disable,
 315};
 316
 317static struct regulator_ops max77686_buck1_ops = {
 318        .list_voltage           = regulator_list_voltage_linear,
 319        .map_voltage            = regulator_map_voltage_linear,
 320        .is_enabled             = regulator_is_enabled_regmap,
 321        .enable                 = max77686_enable,
 322        .disable                = regulator_disable_regmap,
 323        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 324        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 325        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 326        .set_suspend_disable    = max77686_set_suspend_disable,
 327};
 328
 329static struct regulator_ops max77686_buck_dvs_ops = {
 330        .list_voltage           = regulator_list_voltage_linear,
 331        .map_voltage            = regulator_map_voltage_linear,
 332        .is_enabled             = regulator_is_enabled_regmap,
 333        .enable                 = max77686_enable,
 334        .disable                = regulator_disable_regmap,
 335        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 336        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 337        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 338        .set_ramp_delay         = max77686_set_ramp_delay,
 339        .set_suspend_disable    = max77686_set_suspend_disable,
 340};
 341
 342#define regulator_desc_ldo(num)         {                               \
 343        .name           = "LDO"#num,                                    \
 344        .of_match       = of_match_ptr("LDO"#num),                      \
 345        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 346        .of_parse_cb    = max77686_of_parse_cb,                         \
 347        .id             = MAX77686_LDO##num,                            \
 348        .ops            = &max77686_ops,                                \
 349        .type           = REGULATOR_VOLTAGE,                            \
 350        .owner          = THIS_MODULE,                                  \
 351        .min_uV         = MAX77686_LDO_MINUV,                           \
 352        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 353        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 354        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 355        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 356        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 357        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 358        .enable_mask    = MAX77686_OPMODE_MASK                          \
 359                        << MAX77686_OPMODE_SHIFT,                       \
 360}
 361#define regulator_desc_lpm_ldo(num)     {                               \
 362        .name           = "LDO"#num,                                    \
 363        .of_match       = of_match_ptr("LDO"#num),                      \
 364        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 365        .id             = MAX77686_LDO##num,                            \
 366        .ops            = &max77686_ldo_ops,                            \
 367        .type           = REGULATOR_VOLTAGE,                            \
 368        .owner          = THIS_MODULE,                                  \
 369        .min_uV         = MAX77686_LDO_MINUV,                           \
 370        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 371        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 372        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 373        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 374        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 375        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 376        .enable_mask    = MAX77686_OPMODE_MASK                          \
 377                        << MAX77686_OPMODE_SHIFT,                       \
 378}
 379#define regulator_desc_ldo_low(num)             {                       \
 380        .name           = "LDO"#num,                                    \
 381        .of_match       = of_match_ptr("LDO"#num),                      \
 382        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 383        .id             = MAX77686_LDO##num,                            \
 384        .ops            = &max77686_ldo_ops,                            \
 385        .type           = REGULATOR_VOLTAGE,                            \
 386        .owner          = THIS_MODULE,                                  \
 387        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 388        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 389        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 390        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 391        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 392        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 393        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 394        .enable_mask    = MAX77686_OPMODE_MASK                          \
 395                        << MAX77686_OPMODE_SHIFT,                       \
 396}
 397#define regulator_desc_ldo1_low(num)            {                       \
 398        .name           = "LDO"#num,                                    \
 399        .of_match       = of_match_ptr("LDO"#num),                      \
 400        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 401        .id             = MAX77686_LDO##num,                            \
 402        .ops            = &max77686_ops,                                \
 403        .type           = REGULATOR_VOLTAGE,                            \
 404        .owner          = THIS_MODULE,                                  \
 405        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 406        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 407        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 408        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 409        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 410        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 411        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 412        .enable_mask    = MAX77686_OPMODE_MASK                          \
 413                        << MAX77686_OPMODE_SHIFT,                       \
 414}
 415#define regulator_desc_buck(num)                {                       \
 416        .name           = "BUCK"#num,                                   \
 417        .of_match       = of_match_ptr("BUCK"#num),                     \
 418        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 419        .of_parse_cb    = max77686_of_parse_cb,                         \
 420        .id             = MAX77686_BUCK##num,                           \
 421        .ops            = &max77686_ops,                                \
 422        .type           = REGULATOR_VOLTAGE,                            \
 423        .owner          = THIS_MODULE,                                  \
 424        .min_uV         = MAX77686_BUCK_MINUV,                          \
 425        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 426        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 427        .enable_time    = MAX77686_BUCK_ENABLE_TIME,                    \
 428        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 429        .vsel_reg       = MAX77686_REG_BUCK5OUT + (num - 5) * 2,        \
 430        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 431        .enable_reg     = MAX77686_REG_BUCK5CTRL + (num - 5) * 2,       \
 432        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 433}
 434#define regulator_desc_buck1(num)               {                       \
 435        .name           = "BUCK"#num,                                   \
 436        .of_match       = of_match_ptr("BUCK"#num),                     \
 437        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 438        .id             = MAX77686_BUCK##num,                           \
 439        .ops            = &max77686_buck1_ops,                          \
 440        .type           = REGULATOR_VOLTAGE,                            \
 441        .owner          = THIS_MODULE,                                  \
 442        .min_uV         = MAX77686_BUCK_MINUV,                          \
 443        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 444        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 445        .enable_time    = MAX77686_BUCK_ENABLE_TIME,                    \
 446        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 447        .vsel_reg       = MAX77686_REG_BUCK1OUT,                        \
 448        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 449        .enable_reg     = MAX77686_REG_BUCK1CTRL,                       \
 450        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 451}
 452#define regulator_desc_buck_dvs(num)            {                       \
 453        .name           = "BUCK"#num,                                   \
 454        .of_match       = of_match_ptr("BUCK"#num),                     \
 455        .regulators_node        = of_match_ptr("voltage-regulators"),   \
 456        .id             = MAX77686_BUCK##num,                           \
 457        .ops            = &max77686_buck_dvs_ops,                       \
 458        .type           = REGULATOR_VOLTAGE,                            \
 459        .owner          = THIS_MODULE,                                  \
 460        .min_uV         = MAX77686_DVS_MINUV,                           \
 461        .uV_step        = MAX77686_DVS_UVSTEP,                          \
 462        .ramp_delay     = MAX77686_DVS_RAMP_DELAY,                      \
 463        .enable_time    = MAX77686_DVS_ENABLE_TIME,                     \
 464        .n_voltages     = MAX77686_DVS_VSEL_MASK + 1,                   \
 465        .vsel_reg       = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,      \
 466        .vsel_mask      = MAX77686_DVS_VSEL_MASK,                       \
 467        .enable_reg     = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,     \
 468        .enable_mask    = MAX77686_OPMODE_MASK                          \
 469                        << MAX77686_OPMODE_BUCK234_SHIFT,               \
 470}
 471
 472static const struct regulator_desc regulators[] = {
 473        regulator_desc_ldo1_low(1),
 474        regulator_desc_ldo_low(2),
 475        regulator_desc_ldo(3),
 476        regulator_desc_ldo(4),
 477        regulator_desc_ldo(5),
 478        regulator_desc_ldo_low(6),
 479        regulator_desc_ldo_low(7),
 480        regulator_desc_ldo_low(8),
 481        regulator_desc_ldo(9),
 482        regulator_desc_lpm_ldo(10),
 483        regulator_desc_lpm_ldo(11),
 484        regulator_desc_lpm_ldo(12),
 485        regulator_desc_ldo(13),
 486        regulator_desc_lpm_ldo(14),
 487        regulator_desc_ldo_low(15),
 488        regulator_desc_lpm_ldo(16),
 489        regulator_desc_ldo(17),
 490        regulator_desc_ldo(18),
 491        regulator_desc_ldo(19),
 492        regulator_desc_ldo(20),
 493        regulator_desc_ldo(21),
 494        regulator_desc_ldo(22),
 495        regulator_desc_ldo(23),
 496        regulator_desc_ldo(24),
 497        regulator_desc_ldo(25),
 498        regulator_desc_ldo(26),
 499        regulator_desc_buck1(1),
 500        regulator_desc_buck_dvs(2),
 501        regulator_desc_buck_dvs(3),
 502        regulator_desc_buck_dvs(4),
 503        regulator_desc_buck(5),
 504        regulator_desc_buck(6),
 505        regulator_desc_buck(7),
 506        regulator_desc_buck(8),
 507        regulator_desc_buck(9),
 508};
 509
 510static int max77686_pmic_probe(struct platform_device *pdev)
 511{
 512        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 513        struct max77686_data *max77686;
 514        int i;
 515        struct regulator_config config = { };
 516
 517        dev_dbg(&pdev->dev, "%s\n", __func__);
 518
 519        max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
 520                                GFP_KERNEL);
 521        if (!max77686)
 522                return -ENOMEM;
 523
 524        config.dev = iodev->dev;
 525        config.regmap = iodev->regmap;
 526        config.driver_data = max77686;
 527        platform_set_drvdata(pdev, max77686);
 528
 529        for (i = 0; i < MAX77686_REGULATORS; i++) {
 530                struct regulator_dev *rdev;
 531                int id = regulators[i].id;
 532
 533                max77686->opmode[id] = MAX77686_NORMAL;
 534                rdev = devm_regulator_register(&pdev->dev,
 535                                                &regulators[i], &config);
 536                if (IS_ERR(rdev)) {
 537                        int ret = PTR_ERR(rdev);
 538                        dev_err(&pdev->dev,
 539                                "regulator init failed for %d: %d\n", i, ret);
 540                        return ret;
 541                }
 542        }
 543
 544        return 0;
 545}
 546
 547static const struct platform_device_id max77686_pmic_id[] = {
 548        {"max77686-pmic", 0},
 549        { },
 550};
 551MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 552
 553static struct platform_driver max77686_pmic_driver = {
 554        .driver = {
 555                .name = "max77686-pmic",
 556        },
 557        .probe = max77686_pmic_probe,
 558        .id_table = max77686_pmic_id,
 559};
 560
 561module_platform_driver(max77686_pmic_driver);
 562
 563MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 564MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 565MODULE_LICENSE("GPL");
 566