drivers/regulator/max77686-regulator.c

   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
  85 enum max77686_ramp_rate {
  86         RAMP_RATE_13P75MV,
  87         RAMP_RATE_27P5MV,
  88         RAMP_RATE_55MV,
  89         RAMP_RATE_NO_CTRL,      /* 100mV/us */
  90 };
  91
  92 struct max77686_data {
  93         DECLARE_BITMAP(gpio_enabled, MAX77686_REGULATORS);
  94
  95         /* Array indexed by regulator id */
  96         unsigned int opmode[MAX77686_REGULATORS];
  97 };
  98
  99 static 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  */
 119 static 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 */
 134 static 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 */
 153 static 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 */
 188 static 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
 221 static 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
 237 static 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
 262 static 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
 292 static 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
 304 static 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
 317 static 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
 329 static 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
 472 static 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
 510 static 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
 547 static const struct platform_device_id max77686_pmic_id[] = {
 548         {"max77686-pmic", 0},
 549         { },
 550 };
 551 MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 552
 553 static 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
 561 module_platform_driver(max77686_pmic_driver);
 562
 563 MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 564 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 565 MODULE_LICENSE("GPL");