drivers/regulator/max77802-regulator.c

   1 /*
   2  * max77802.c - Regulator driver for the Maxim 77802
   3  *
   4  * Copyright (C) 2013-2014 Google, Inc
   5  * Simon Glass <sjg@chromium.org>
   6  *
   7  * Copyright (C) 2012 Samsung Electronics
   8  * Chiwoong Byun <woong.byun@samsung.com>
   9  * Jonghwa Lee <jonghwa3.lee@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * This driver is based on max8997.c
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/bug.h>
  26 #include <linux/err.h>
  27 #include <linux/gpio.h>
  28 #include <linux/slab.h>
  29 #include <linux/gpio/consumer.h>
  30 #include <linux/module.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 #include <dt-bindings/regulator/maxim,max77802.h>
  38
  39 /* Default ramp delay in case it is not manually set */
  40 #define MAX77802_RAMP_DELAY             100000          /* uV/us */
  41
  42 #define MAX77802_OPMODE_SHIFT_LDO       6
  43 #define MAX77802_OPMODE_BUCK234_SHIFT   4
  44 #define MAX77802_OPMODE_MASK            0x3
  45
  46 #define MAX77802_VSEL_MASK              0x3F
  47 #define MAX77802_DVS_VSEL_MASK          0xFF
  48
  49 #define MAX77802_RAMP_RATE_MASK_2BIT    0xC0
  50 #define MAX77802_RAMP_RATE_SHIFT_2BIT   6
  51 #define MAX77802_RAMP_RATE_MASK_4BIT    0xF0
  52 #define MAX77802_RAMP_RATE_SHIFT_4BIT   4
  53
  54 #define MAX77802_STATUS_OFF             0x0
  55 #define MAX77802_OFF_PWRREQ             0x1
  56 #define MAX77802_LP_PWRREQ              0x2
  57
  58 /* MAX77802 has two register formats: 2-bit and 4-bit */
  59 static const unsigned int ramp_table_77802_2bit[] = {
  60         12500,
  61         25000,
  62         50000,
  63         100000,
  64 };
  65
  66 static unsigned int ramp_table_77802_4bit[] = {
  67         1000,   2000,   3030,   4000,
  68         5000,   5880,   7140,   8330,
  69         9090,   10000,  11110,  12500,
  70         16670,  25000,  50000,  100000,
  71 };
  72
  73 struct max77802_regulator_prv {
  74         /* Array indexed by regulator id */
  75         unsigned int opmode[MAX77802_REG_MAX];
  76 };
  77
  78 static inline unsigned int max77802_map_mode(unsigned int mode)
  79 {
  80         return mode == MAX77802_OPMODE_NORMAL ?
  81                 REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
  82 }
  83
  84 static int max77802_get_opmode_shift(int id)
  85 {
  86         if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
  87                                      id <= MAX77802_BUCK10))
  88                 return 0;
  89
  90         if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
  91                 return MAX77802_OPMODE_BUCK234_SHIFT;
  92
  93         if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
  94                 return MAX77802_OPMODE_SHIFT_LDO;
  95
  96         return -EINVAL;
  97 }
  98
  99 /**
 100  * max77802_set_suspend_disable - Disable the regulator during system suspend
 101  * @rdev: regulator to mark as disabled
 102  *
 103  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
 104  * Configure the regulator so the PMIC will turn it OFF during system suspend.
 105  */
 106 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
 107 {
 108         unsigned int val = MAX77802_OFF_PWRREQ;
 109         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 110         unsigned int id = rdev_get_id(rdev);
 111         int shift = max77802_get_opmode_shift(id);
 112
 113         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 114                 return -EINVAL;
 115         max77802->opmode[id] = val;
 116         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 117                                   rdev->desc->enable_mask, val << shift);
 118 }
 119
 120 /*
 121  * Some LDOs support Low Power Mode while the system is running.
 122  *
 123  * LDOs 1, 3, 20, 21.
 124  */
 125 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
 126 {
 127         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 128         unsigned int id = rdev_get_id(rdev);
 129         unsigned int val;
 130         int shift = max77802_get_opmode_shift(id);
 131
 132         switch (mode) {
 133         case REGULATOR_MODE_STANDBY:
 134                 val = MAX77802_OPMODE_LP;       /* ON in Low Power Mode */
 135                 break;
 136         case REGULATOR_MODE_NORMAL:
 137                 val = MAX77802_OPMODE_NORMAL;   /* ON in Normal Mode */
 138                 break;
 139         default:
 140                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 141                          rdev->desc->name, mode);
 142                 return -EINVAL;
 143         }
 144
 145         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 146                 return -EINVAL;
 147
 148         max77802->opmode[id] = val;
 149         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 150                                   rdev->desc->enable_mask, val << shift);
 151 }
 152
 153 static unsigned max77802_get_mode(struct regulator_dev *rdev)
 154 {
 155         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 156         unsigned int id = rdev_get_id(rdev);
 157
 158         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 159                 return -EINVAL;
 160         return max77802_map_mode(max77802->opmode[id]);
 161 }
 162
 163 /**
 164  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
 165  * @rdev: regulator to change mode
 166  * @mode: operating mode to be set
 167  *
 168  * Will set the operating mode for the regulators during system suspend.
 169  * This function is valid for the three different enable control logics:
 170  *
 171  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
 172  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
 173  * Enable Control Logic3 by PWRREQ (LDO 3)
 174  *
 175  * If setting the regulator mode fails, the function only warns but does
 176  * not return an error code to avoid the regulator core to stop setting
 177  * the operating mode for the remaining regulators.
 178  */
 179 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 180                                      unsigned int mode)
 181 {
 182         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 183         unsigned int id = rdev_get_id(rdev);
 184         unsigned int val;
 185         int shift = max77802_get_opmode_shift(id);
 186
 187         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 188                 return -EINVAL;
 189
 190         /*
 191          * If the regulator has been disabled for suspend
 192          * then is invalid to try setting a suspend mode.
 193          */
 194         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
 195                 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 196                          rdev->desc->name, mode);
 197                 return 0;
 198         }
 199
 200         switch (mode) {
 201         case REGULATOR_MODE_STANDBY:
 202                 /*
 203                  * If the regulator opmode is normal then enable
 204                  * ON in Low Power Mode by PWRREQ. If the mode is
 205                  * already Low Power then no action is required.
 206                  */
 207                 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
 208                         val = MAX77802_LP_PWRREQ;
 209                 else
 210                         return 0;
 211                 break;
 212         case REGULATOR_MODE_NORMAL:
 213                 /*
 214                  * If the regulator operating mode is Low Power then
 215                  * normal is not a valid opmode in suspend. If the
 216                  * mode is already normal then no action is required.
 217                  */
 218                 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
 219                         dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
 220                                  rdev->desc->name, mode);
 221                 return 0;
 222         default:
 223                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 224                          rdev->desc->name, mode);
 225                 return -EINVAL;
 226         }
 227
 228         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 229                                   rdev->desc->enable_mask, val << shift);
 230 }
 231
 232 static int max77802_enable(struct regulator_dev *rdev)
 233 {
 234         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 235         unsigned int id = rdev_get_id(rdev);
 236         int shift = max77802_get_opmode_shift(id);
 237
 238         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 239                 return -EINVAL;
 240         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 241                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 242
 243         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 244                                   rdev->desc->enable_mask,
 245                                   max77802->opmode[id] << shift);
 246 }
 247
 248 static int max77802_find_ramp_value(struct regulator_dev *rdev,
 249                                     const unsigned int limits[], int size,
 250                                     unsigned int ramp_delay)
 251 {
 252         int i;
 253
 254         for (i = 0; i < size; i++) {
 255                 if (ramp_delay <= limits[i])
 256                         return i;
 257         }
 258
 259         /* Use maximum value for no ramp control */
 260         dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
 261                  rdev->desc->name, ramp_delay);
 262         return size - 1;
 263 }
 264
 265 /* Used for BUCKs 2-4 */
 266 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
 267                                         int ramp_delay)
 268 {
 269         int id = rdev_get_id(rdev);
 270         unsigned int ramp_value;
 271
 272         if (id > MAX77802_BUCK4) {
 273                         dev_warn(&rdev->dev,
 274                                  "%s: regulator: ramp delay not supported\n",
 275                                  rdev->desc->name);
 276                 return -EINVAL;
 277         }
 278         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
 279                                 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
 280
 281         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 282                                   MAX77802_RAMP_RATE_MASK_2BIT,
 283                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
 284 }
 285
 286 /* For BUCK1, 6 */
 287 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
 288                                             int ramp_delay)
 289 {
 290         unsigned int ramp_value;
 291
 292         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
 293                                 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
 294
 295         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 296                                   MAX77802_RAMP_RATE_MASK_4BIT,
 297                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
 298 }
 299
 300 /*
 301  * LDOs 2, 4-19, 22-35
 302  */
 303 static const struct regulator_ops max77802_ldo_ops_logic1 = {
 304         .list_voltage           = regulator_list_voltage_linear,
 305         .map_voltage            = regulator_map_voltage_linear,
 306         .is_enabled             = regulator_is_enabled_regmap,
 307         .enable                 = max77802_enable,
 308         .disable                = regulator_disable_regmap,
 309         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 310         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 311         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 312         .set_suspend_disable    = max77802_set_suspend_disable,
 313         .set_suspend_mode       = max77802_set_suspend_mode,
 314 };
 315
 316 /*
 317  * LDOs 1, 20, 21, 3
 318  */
 319 static const struct regulator_ops max77802_ldo_ops_logic2 = {
 320         .list_voltage           = regulator_list_voltage_linear,
 321         .map_voltage            = regulator_map_voltage_linear,
 322         .is_enabled             = regulator_is_enabled_regmap,
 323         .enable                 = max77802_enable,
 324         .disable                = regulator_disable_regmap,
 325         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 326         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 327         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 328         .set_mode               = max77802_set_mode,
 329         .get_mode               = max77802_get_mode,
 330         .set_suspend_mode       = max77802_set_suspend_mode,
 331 };
 332
 333 /* BUCKS 1, 6 */
 334 static const struct regulator_ops max77802_buck_16_dvs_ops = {
 335         .list_voltage           = regulator_list_voltage_linear,
 336         .map_voltage            = regulator_map_voltage_linear,
 337         .is_enabled             = regulator_is_enabled_regmap,
 338         .enable                 = max77802_enable,
 339         .disable                = regulator_disable_regmap,
 340         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 341         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 342         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 343         .set_ramp_delay         = max77802_set_ramp_delay_4bit,
 344         .set_suspend_disable    = max77802_set_suspend_disable,
 345 };
 346
 347 /* BUCKs 2-4 */
 348 static const struct regulator_ops max77802_buck_234_ops = {
 349         .list_voltage           = regulator_list_voltage_linear,
 350         .map_voltage            = regulator_map_voltage_linear,
 351         .is_enabled             = regulator_is_enabled_regmap,
 352         .enable                 = max77802_enable,
 353         .disable                = regulator_disable_regmap,
 354         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 355         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 356         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 357         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 358         .set_suspend_disable    = max77802_set_suspend_disable,
 359         .set_suspend_mode       = max77802_set_suspend_mode,
 360 };
 361
 362 /* BUCKs 5, 7-10 */
 363 static const struct regulator_ops max77802_buck_dvs_ops = {
 364         .list_voltage           = regulator_list_voltage_linear,
 365         .map_voltage            = regulator_map_voltage_linear,
 366         .is_enabled             = regulator_is_enabled_regmap,
 367         .enable                 = max77802_enable,
 368         .disable                = regulator_disable_regmap,
 369         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 370         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 371         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 372         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 373         .set_suspend_disable    = max77802_set_suspend_disable,
 374 };
 375
 376 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 377 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 378         .name           = "LDO"#num,                                    \
 379         .of_match       = of_match_ptr("LDO"#num),                      \
 380         .regulators_node        = of_match_ptr("regulators"),           \
 381         .id             = MAX77802_LDO##num,                            \
 382         .supply_name    = "inl"#supply,                                 \
 383         .ops            = &max77802_ldo_ops_logic##log,                 \
 384         .type           = REGULATOR_VOLTAGE,                            \
 385         .owner          = THIS_MODULE,                                  \
 386         .min_uV         = 800000,                                       \
 387         .uV_step        = 50000,                                        \
 388         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 389         .n_voltages     = 1 << 6,                                       \
 390         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 391         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 392         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 393         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 394         .of_map_mode    = max77802_map_mode,                            \
 395 }
 396
 397 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 398 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 399         .name           = "LDO"#num,                                    \
 400         .of_match       = of_match_ptr("LDO"#num),                      \
 401         .regulators_node        = of_match_ptr("regulators"),           \
 402         .id             = MAX77802_LDO##num,                            \
 403         .supply_name    = "inl"#supply,                                 \
 404         .ops            = &max77802_ldo_ops_logic##log,                 \
 405         .type           = REGULATOR_VOLTAGE,                            \
 406         .owner          = THIS_MODULE,                                  \
 407         .min_uV         = 800000,                                       \
 408         .uV_step        = 25000,                                        \
 409         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 410         .n_voltages     = 1 << 6,                                       \
 411         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 412         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 413         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 414         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 415         .of_map_mode    = max77802_map_mode,                            \
 416 }
 417
 418 /* BUCKs 1, 6 */
 419 #define regulator_77802_desc_16_buck(num)       {               \
 420         .name           = "BUCK"#num,                                   \
 421         .of_match       = of_match_ptr("BUCK"#num),                     \
 422         .regulators_node        = of_match_ptr("regulators"),           \
 423         .id             = MAX77802_BUCK##num,                           \
 424         .supply_name    = "inb"#num,                                    \
 425         .ops            = &max77802_buck_16_dvs_ops,                    \
 426         .type           = REGULATOR_VOLTAGE,                            \
 427         .owner          = THIS_MODULE,                                  \
 428         .min_uV         = 612500,                                       \
 429         .uV_step        = 6250,                                         \
 430         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 431         .n_voltages     = 1 << 8,                                       \
 432         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 433         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 434         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 435         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 436         .of_map_mode    = max77802_map_mode,                            \
 437 }
 438
 439 /* BUCKS 2-4 */
 440 #define regulator_77802_desc_234_buck(num)      {               \
 441         .name           = "BUCK"#num,                                   \
 442         .of_match       = of_match_ptr("BUCK"#num),                     \
 443         .regulators_node        = of_match_ptr("regulators"),           \
 444         .id             = MAX77802_BUCK##num,                           \
 445         .supply_name    = "inb"#num,                                    \
 446         .ops            = &max77802_buck_234_ops,                       \
 447         .type           = REGULATOR_VOLTAGE,                            \
 448         .owner          = THIS_MODULE,                                  \
 449         .min_uV         = 600000,                                       \
 450         .uV_step        = 6250,                                         \
 451         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 452         .n_voltages     = 0x91,                                         \
 453         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 454         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 455         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 456         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 457                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 458         .of_map_mode    = max77802_map_mode,                            \
 459 }
 460
 461 /* BUCK 5 */
 462 #define regulator_77802_desc_buck5(num)         {               \
 463         .name           = "BUCK"#num,                                   \
 464         .of_match       = of_match_ptr("BUCK"#num),                     \
 465         .regulators_node        = of_match_ptr("regulators"),           \
 466         .id             = MAX77802_BUCK##num,                           \
 467         .supply_name    = "inb"#num,                                    \
 468         .ops            = &max77802_buck_dvs_ops,                       \
 469         .type           = REGULATOR_VOLTAGE,                            \
 470         .owner          = THIS_MODULE,                                  \
 471         .min_uV         = 750000,                                       \
 472         .uV_step        = 50000,                                        \
 473         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 474         .n_voltages     = 1 << 6,                                       \
 475         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 476         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 477         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 478         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 479         .of_map_mode    = max77802_map_mode,                            \
 480 }
 481
 482 /* BUCKs 7-10 */
 483 #define regulator_77802_desc_buck7_10(num)      {               \
 484         .name           = "BUCK"#num,                                   \
 485         .of_match       = of_match_ptr("BUCK"#num),                     \
 486         .regulators_node        = of_match_ptr("regulators"),           \
 487         .id             = MAX77802_BUCK##num,                           \
 488         .supply_name    = "inb"#num,                                    \
 489         .ops            = &max77802_buck_dvs_ops,                       \
 490         .type           = REGULATOR_VOLTAGE,                            \
 491         .owner          = THIS_MODULE,                                  \
 492         .min_uV         = 750000,                                       \
 493         .uV_step        = 50000,                                        \
 494         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 495         .n_voltages     = 1 << 6,                                       \
 496         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 497         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 498         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 499         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 500         .of_map_mode    = max77802_map_mode,                            \
 501 }
 502
 503 static const struct regulator_desc regulators[] = {
 504         regulator_77802_desc_16_buck(1),
 505         regulator_77802_desc_234_buck(2),
 506         regulator_77802_desc_234_buck(3),
 507         regulator_77802_desc_234_buck(4),
 508         regulator_77802_desc_buck5(5),
 509         regulator_77802_desc_16_buck(6),
 510         regulator_77802_desc_buck7_10(7),
 511         regulator_77802_desc_buck7_10(8),
 512         regulator_77802_desc_buck7_10(9),
 513         regulator_77802_desc_buck7_10(10),
 514         regulator_77802_desc_n_ldo(1, 10, 2),
 515         regulator_77802_desc_n_ldo(2, 10, 1),
 516         regulator_77802_desc_p_ldo(3, 3, 2),
 517         regulator_77802_desc_p_ldo(4, 6, 1),
 518         regulator_77802_desc_p_ldo(5, 3, 1),
 519         regulator_77802_desc_p_ldo(6, 3, 1),
 520         regulator_77802_desc_p_ldo(7, 3, 1),
 521         regulator_77802_desc_n_ldo(8, 1, 1),
 522         regulator_77802_desc_p_ldo(9, 5, 1),
 523         regulator_77802_desc_p_ldo(10, 4, 1),
 524         regulator_77802_desc_p_ldo(11, 4, 1),
 525         regulator_77802_desc_p_ldo(12, 9, 1),
 526         regulator_77802_desc_p_ldo(13, 4, 1),
 527         regulator_77802_desc_p_ldo(14, 4, 1),
 528         regulator_77802_desc_n_ldo(15, 1, 1),
 529         regulator_77802_desc_n_ldo(17, 2, 1),
 530         regulator_77802_desc_p_ldo(18, 7, 1),
 531         regulator_77802_desc_p_ldo(19, 5, 1),
 532         regulator_77802_desc_p_ldo(20, 7, 2),
 533         regulator_77802_desc_p_ldo(21, 6, 2),
 534         regulator_77802_desc_p_ldo(23, 9, 1),
 535         regulator_77802_desc_p_ldo(24, 6, 1),
 536         regulator_77802_desc_p_ldo(25, 9, 1),
 537         regulator_77802_desc_p_ldo(26, 9, 1),
 538         regulator_77802_desc_n_ldo(27, 2, 1),
 539         regulator_77802_desc_p_ldo(28, 7, 1),
 540         regulator_77802_desc_p_ldo(29, 7, 1),
 541         regulator_77802_desc_n_ldo(30, 2, 1),
 542         regulator_77802_desc_p_ldo(32, 9, 1),
 543         regulator_77802_desc_p_ldo(33, 6, 1),
 544         regulator_77802_desc_p_ldo(34, 9, 1),
 545         regulator_77802_desc_n_ldo(35, 2, 1),
 546 };
 547
 548 static int max77802_pmic_probe(struct platform_device *pdev)
 549 {
 550         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 551         struct max77802_regulator_prv *max77802;
 552         int i, val;
 553         struct regulator_config config = { };
 554
 555         max77802 = devm_kzalloc(&pdev->dev,
 556                                 sizeof(struct max77802_regulator_prv),
 557                                 GFP_KERNEL);
 558         if (!max77802)
 559                 return -ENOMEM;
 560
 561         config.dev = iodev->dev;
 562         config.regmap = iodev->regmap;
 563         config.driver_data = max77802;
 564         platform_set_drvdata(pdev, max77802);
 565
 566         for (i = 0; i < MAX77802_REG_MAX; i++) {
 567                 struct regulator_dev *rdev;
 568                 unsigned int id = regulators[i].id;
 569                 int shift = max77802_get_opmode_shift(id);
 570                 int ret;
 571
 572                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 573                 if (ret < 0) {
 574                         dev_warn(&pdev->dev,
 575                                 "cannot read current mode for %d\n", i);
 576                         val = MAX77802_OPMODE_NORMAL;
 577                 } else {
 578                         val = val >> shift & MAX77802_OPMODE_MASK;
 579                 }
 580
 581                 /*
 582                  * If the regulator is disabled and the system warm rebooted,
 583                  * the hardware reports OFF as the regulator operating mode.
 584                  * Default to operating mode NORMAL in that case.
 585                  */
 586                 if (id < ARRAY_SIZE(max77802->opmode)) {
 587                         if (val == MAX77802_STATUS_OFF)
 588                                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 589                         else
 590                                 max77802->opmode[id] = val;
 591                 }
 592
 593                 rdev = devm_regulator_register(&pdev->dev,
 594                                                &regulators[i], &config);
 595                 if (IS_ERR(rdev)) {
 596                         ret = PTR_ERR(rdev);
 597                         dev_err(&pdev->dev,
 598                                 "regulator init failed for %d: %d\n", i, ret);
 599                         return ret;
 600                 }
 601         }
 602
 603         return 0;
 604 }
 605
 606 static const struct platform_device_id max77802_pmic_id[] = {
 607         {"max77802-pmic", 0},
 608         { },
 609 };
 610 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 611
 612 static struct platform_driver max77802_pmic_driver = {
 613         .driver = {
 614                 .name = "max77802-pmic",
 615         },
 616         .probe = max77802_pmic_probe,
 617         .id_table = max77802_pmic_id,
 618 };
 619
 620 module_platform_driver(max77802_pmic_driver);
 621
 622 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 623 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 624 MODULE_LICENSE("GPL");