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         int id = rdev_get_id(rdev);
 111         int shift = max77802_get_opmode_shift(id);
 112
 113         max77802->opmode[id] = val;
 114         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 115                                   rdev->desc->enable_mask, val << shift);
 116 }
 117
 118 /*
 119  * Some LDOs support Low Power Mode while the system is running.
 120  *
 121  * LDOs 1, 3, 20, 21.
 122  */
 123 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
 124 {
 125         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 126         int id = rdev_get_id(rdev);
 127         unsigned int val;
 128         int shift = max77802_get_opmode_shift(id);
 129
 130         switch (mode) {
 131         case REGULATOR_MODE_STANDBY:
 132                 val = MAX77802_OPMODE_LP;       /* ON in Low Power Mode */
 133                 break;
 134         case REGULATOR_MODE_NORMAL:
 135                 val = MAX77802_OPMODE_NORMAL;   /* ON in Normal Mode */
 136                 break;
 137         default:
 138                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 139                          rdev->desc->name, mode);
 140                 return -EINVAL;
 141         }
 142
 143         max77802->opmode[id] = val;
 144         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 145                                   rdev->desc->enable_mask, val << shift);
 146 }
 147
 148 static unsigned max77802_get_mode(struct regulator_dev *rdev)
 149 {
 150         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 151         int id = rdev_get_id(rdev);
 152
 153         return max77802_map_mode(max77802->opmode[id]);
 154 }
 155
 156 /**
 157  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
 158  * @rdev: regulator to change mode
 159  * @mode: operating mode to be set
 160  *
 161  * Will set the operating mode for the regulators during system suspend.
 162  * This function is valid for the three different enable control logics:
 163  *
 164  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
 165  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
 166  * Enable Control Logic3 by PWRREQ (LDO 3)
 167  *
 168  * If setting the regulator mode fails, the function only warns but does
 169  * not return an error code to avoid the regulator core to stop setting
 170  * the operating mode for the remaining regulators.
 171  */
 172 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 173                                      unsigned int mode)
 174 {
 175         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 176         int id = rdev_get_id(rdev);
 177         unsigned int val;
 178         int shift = max77802_get_opmode_shift(id);
 179
 180         /*
 181          * If the regulator has been disabled for suspend
 182          * then is invalid to try setting a suspend mode.
 183          */
 184         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
 185                 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 186                          rdev->desc->name, mode);
 187                 return 0;
 188         }
 189
 190         switch (mode) {
 191         case REGULATOR_MODE_STANDBY:
 192                 /*
 193                  * If the regulator opmode is normal then enable
 194                  * ON in Low Power Mode by PWRREQ. If the mode is
 195                  * already Low Power then no action is required.
 196                  */
 197                 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
 198                         val = MAX77802_LP_PWRREQ;
 199                 else
 200                         return 0;
 201                 break;
 202         case REGULATOR_MODE_NORMAL:
 203                 /*
 204                  * If the regulator operating mode is Low Power then
 205                  * normal is not a valid opmode in suspend. If the
 206                  * mode is already normal then no action is required.
 207                  */
 208                 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
 209                         dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
 210                                  rdev->desc->name, mode);
 211                 return 0;
 212         default:
 213                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 214                          rdev->desc->name, mode);
 215                 return -EINVAL;
 216         }
 217
 218         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 219                                   rdev->desc->enable_mask, val << shift);
 220 }
 221
 222 static int max77802_enable(struct regulator_dev *rdev)
 223 {
 224         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 225         int id = rdev_get_id(rdev);
 226         int shift = max77802_get_opmode_shift(id);
 227
 228         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 229                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 230
 231         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 232                                   rdev->desc->enable_mask,
 233                                   max77802->opmode[id] << shift);
 234 }
 235
 236 static int max77802_find_ramp_value(struct regulator_dev *rdev,
 237                                     const unsigned int limits[], int size,
 238                                     unsigned int ramp_delay)
 239 {
 240         int i;
 241
 242         for (i = 0; i < size; i++) {
 243                 if (ramp_delay <= limits[i])
 244                         return i;
 245         }
 246
 247         /* Use maximum value for no ramp control */
 248         dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
 249                  rdev->desc->name, ramp_delay);
 250         return size - 1;
 251 }
 252
 253 /* Used for BUCKs 2-4 */
 254 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
 255                                         int ramp_delay)
 256 {
 257         int id = rdev_get_id(rdev);
 258         unsigned int ramp_value;
 259
 260         if (id > MAX77802_BUCK4) {
 261                         dev_warn(&rdev->dev,
 262                                  "%s: regulator: ramp delay not supported\n",
 263                                  rdev->desc->name);
 264                 return -EINVAL;
 265         }
 266         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
 267                                 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
 268
 269         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 270                                   MAX77802_RAMP_RATE_MASK_2BIT,
 271                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
 272 }
 273
 274 /* For BUCK1, 6 */
 275 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
 276                                             int ramp_delay)
 277 {
 278         unsigned int ramp_value;
 279
 280         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
 281                                 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
 282
 283         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 284                                   MAX77802_RAMP_RATE_MASK_4BIT,
 285                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
 286 }
 287
 288 /*
 289  * LDOs 2, 4-19, 22-35
 290  */
 291 static struct regulator_ops max77802_ldo_ops_logic1 = {
 292         .list_voltage           = regulator_list_voltage_linear,
 293         .map_voltage            = regulator_map_voltage_linear,
 294         .is_enabled             = regulator_is_enabled_regmap,
 295         .enable                 = max77802_enable,
 296         .disable                = regulator_disable_regmap,
 297         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 298         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 299         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 300         .set_suspend_disable    = max77802_set_suspend_disable,
 301         .set_suspend_mode       = max77802_set_suspend_mode,
 302 };
 303
 304 /*
 305  * LDOs 1, 20, 21, 3
 306  */
 307 static struct regulator_ops max77802_ldo_ops_logic2 = {
 308         .list_voltage           = regulator_list_voltage_linear,
 309         .map_voltage            = regulator_map_voltage_linear,
 310         .is_enabled             = regulator_is_enabled_regmap,
 311         .enable                 = max77802_enable,
 312         .disable                = regulator_disable_regmap,
 313         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 314         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 315         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 316         .set_mode               = max77802_set_mode,
 317         .get_mode               = max77802_get_mode,
 318         .set_suspend_mode       = max77802_set_suspend_mode,
 319 };
 320
 321 /* BUCKS 1, 6 */
 322 static struct regulator_ops max77802_buck_16_dvs_ops = {
 323         .list_voltage           = regulator_list_voltage_linear,
 324         .map_voltage            = regulator_map_voltage_linear,
 325         .is_enabled             = regulator_is_enabled_regmap,
 326         .enable                 = max77802_enable,
 327         .disable                = regulator_disable_regmap,
 328         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 329         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 330         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 331         .set_ramp_delay         = max77802_set_ramp_delay_4bit,
 332         .set_suspend_disable    = max77802_set_suspend_disable,
 333 };
 334
 335 /* BUCKs 2-4 */
 336 static struct regulator_ops max77802_buck_234_ops = {
 337         .list_voltage           = regulator_list_voltage_linear,
 338         .map_voltage            = regulator_map_voltage_linear,
 339         .is_enabled             = regulator_is_enabled_regmap,
 340         .enable                 = max77802_enable,
 341         .disable                = regulator_disable_regmap,
 342         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 343         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 344         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 345         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 346         .set_suspend_disable    = max77802_set_suspend_disable,
 347         .set_suspend_mode       = max77802_set_suspend_mode,
 348 };
 349
 350 /* BUCKs 5, 7-10 */
 351 static struct regulator_ops max77802_buck_dvs_ops = {
 352         .list_voltage           = regulator_list_voltage_linear,
 353         .map_voltage            = regulator_map_voltage_linear,
 354         .is_enabled             = regulator_is_enabled_regmap,
 355         .enable                 = max77802_enable,
 356         .disable                = regulator_disable_regmap,
 357         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 358         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 359         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 360         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 361         .set_suspend_disable    = max77802_set_suspend_disable,
 362 };
 363
 364 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 365 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 366         .name           = "LDO"#num,                                    \
 367         .of_match       = of_match_ptr("LDO"#num),                      \
 368         .regulators_node        = of_match_ptr("regulators"),           \
 369         .id             = MAX77802_LDO##num,                            \
 370         .supply_name    = "inl"#supply,                                 \
 371         .ops            = &max77802_ldo_ops_logic##log,                 \
 372         .type           = REGULATOR_VOLTAGE,                            \
 373         .owner          = THIS_MODULE,                                  \
 374         .min_uV         = 800000,                                       \
 375         .uV_step        = 50000,                                        \
 376         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 377         .n_voltages     = 1 << 6,                                       \
 378         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 379         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 380         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 381         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 382         .of_map_mode    = max77802_map_mode,                            \
 383 }
 384
 385 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 386 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 387         .name           = "LDO"#num,                                    \
 388         .of_match       = of_match_ptr("LDO"#num),                      \
 389         .regulators_node        = of_match_ptr("regulators"),           \
 390         .id             = MAX77802_LDO##num,                            \
 391         .supply_name    = "inl"#supply,                                 \
 392         .ops            = &max77802_ldo_ops_logic##log,                 \
 393         .type           = REGULATOR_VOLTAGE,                            \
 394         .owner          = THIS_MODULE,                                  \
 395         .min_uV         = 800000,                                       \
 396         .uV_step        = 25000,                                        \
 397         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 398         .n_voltages     = 1 << 6,                                       \
 399         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 400         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 401         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 402         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 403         .of_map_mode    = max77802_map_mode,                            \
 404 }
 405
 406 /* BUCKs 1, 6 */
 407 #define regulator_77802_desc_16_buck(num)       {               \
 408         .name           = "BUCK"#num,                                   \
 409         .of_match       = of_match_ptr("BUCK"#num),                     \
 410         .regulators_node        = of_match_ptr("regulators"),           \
 411         .id             = MAX77802_BUCK##num,                           \
 412         .supply_name    = "inb"#num,                                    \
 413         .ops            = &max77802_buck_16_dvs_ops,                    \
 414         .type           = REGULATOR_VOLTAGE,                            \
 415         .owner          = THIS_MODULE,                                  \
 416         .min_uV         = 612500,                                       \
 417         .uV_step        = 6250,                                         \
 418         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 419         .n_voltages     = 1 << 8,                                       \
 420         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 421         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 422         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 423         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 424         .of_map_mode    = max77802_map_mode,                            \
 425 }
 426
 427 /* BUCKS 2-4 */
 428 #define regulator_77802_desc_234_buck(num)      {               \
 429         .name           = "BUCK"#num,                                   \
 430         .of_match       = of_match_ptr("BUCK"#num),                     \
 431         .regulators_node        = of_match_ptr("regulators"),           \
 432         .id             = MAX77802_BUCK##num,                           \
 433         .supply_name    = "inb"#num,                                    \
 434         .ops            = &max77802_buck_234_ops,                       \
 435         .type           = REGULATOR_VOLTAGE,                            \
 436         .owner          = THIS_MODULE,                                  \
 437         .min_uV         = 600000,                                       \
 438         .uV_step        = 6250,                                         \
 439         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 440         .n_voltages     = 0x91,                                         \
 441         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 442         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 443         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 444         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 445                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 446         .of_map_mode    = max77802_map_mode,                            \
 447 }
 448
 449 /* BUCK 5 */
 450 #define regulator_77802_desc_buck5(num)         {               \
 451         .name           = "BUCK"#num,                                   \
 452         .of_match       = of_match_ptr("BUCK"#num),                     \
 453         .regulators_node        = of_match_ptr("regulators"),           \
 454         .id             = MAX77802_BUCK##num,                           \
 455         .supply_name    = "inb"#num,                                    \
 456         .ops            = &max77802_buck_dvs_ops,                       \
 457         .type           = REGULATOR_VOLTAGE,                            \
 458         .owner          = THIS_MODULE,                                  \
 459         .min_uV         = 750000,                                       \
 460         .uV_step        = 50000,                                        \
 461         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 462         .n_voltages     = 1 << 6,                                       \
 463         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 464         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 465         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 466         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 467         .of_map_mode    = max77802_map_mode,                            \
 468 }
 469
 470 /* BUCKs 7-10 */
 471 #define regulator_77802_desc_buck7_10(num)      {               \
 472         .name           = "BUCK"#num,                                   \
 473         .of_match       = of_match_ptr("BUCK"#num),                     \
 474         .regulators_node        = of_match_ptr("regulators"),           \
 475         .id             = MAX77802_BUCK##num,                           \
 476         .supply_name    = "inb"#num,                                    \
 477         .ops            = &max77802_buck_dvs_ops,                       \
 478         .type           = REGULATOR_VOLTAGE,                            \
 479         .owner          = THIS_MODULE,                                  \
 480         .min_uV         = 750000,                                       \
 481         .uV_step        = 50000,                                        \
 482         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 483         .n_voltages     = 1 << 6,                                       \
 484         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 485         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 486         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 487         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 488         .of_map_mode    = max77802_map_mode,                            \
 489 }
 490
 491 static const struct regulator_desc regulators[] = {
 492         regulator_77802_desc_16_buck(1),
 493         regulator_77802_desc_234_buck(2),
 494         regulator_77802_desc_234_buck(3),
 495         regulator_77802_desc_234_buck(4),
 496         regulator_77802_desc_buck5(5),
 497         regulator_77802_desc_16_buck(6),
 498         regulator_77802_desc_buck7_10(7),
 499         regulator_77802_desc_buck7_10(8),
 500         regulator_77802_desc_buck7_10(9),
 501         regulator_77802_desc_buck7_10(10),
 502         regulator_77802_desc_n_ldo(1, 10, 2),
 503         regulator_77802_desc_n_ldo(2, 10, 1),
 504         regulator_77802_desc_p_ldo(3, 3, 2),
 505         regulator_77802_desc_p_ldo(4, 6, 1),
 506         regulator_77802_desc_p_ldo(5, 3, 1),
 507         regulator_77802_desc_p_ldo(6, 3, 1),
 508         regulator_77802_desc_p_ldo(7, 3, 1),
 509         regulator_77802_desc_n_ldo(8, 1, 1),
 510         regulator_77802_desc_p_ldo(9, 5, 1),
 511         regulator_77802_desc_p_ldo(10, 4, 1),
 512         regulator_77802_desc_p_ldo(11, 4, 1),
 513         regulator_77802_desc_p_ldo(12, 9, 1),
 514         regulator_77802_desc_p_ldo(13, 4, 1),
 515         regulator_77802_desc_p_ldo(14, 4, 1),
 516         regulator_77802_desc_n_ldo(15, 1, 1),
 517         regulator_77802_desc_n_ldo(17, 2, 1),
 518         regulator_77802_desc_p_ldo(18, 7, 1),
 519         regulator_77802_desc_p_ldo(19, 5, 1),
 520         regulator_77802_desc_p_ldo(20, 7, 2),
 521         regulator_77802_desc_p_ldo(21, 6, 2),
 522         regulator_77802_desc_p_ldo(23, 9, 1),
 523         regulator_77802_desc_p_ldo(24, 6, 1),
 524         regulator_77802_desc_p_ldo(25, 9, 1),
 525         regulator_77802_desc_p_ldo(26, 9, 1),
 526         regulator_77802_desc_n_ldo(27, 2, 1),
 527         regulator_77802_desc_p_ldo(28, 7, 1),
 528         regulator_77802_desc_p_ldo(29, 7, 1),
 529         regulator_77802_desc_n_ldo(30, 2, 1),
 530         regulator_77802_desc_p_ldo(32, 9, 1),
 531         regulator_77802_desc_p_ldo(33, 6, 1),
 532         regulator_77802_desc_p_ldo(34, 9, 1),
 533         regulator_77802_desc_n_ldo(35, 2, 1),
 534 };
 535
 536 static int max77802_pmic_probe(struct platform_device *pdev)
 537 {
 538         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 539         struct max77802_regulator_prv *max77802;
 540         int i, val;
 541         struct regulator_config config = { };
 542
 543         max77802 = devm_kzalloc(&pdev->dev,
 544                                 sizeof(struct max77802_regulator_prv),
 545                                 GFP_KERNEL);
 546         if (!max77802)
 547                 return -ENOMEM;
 548
 549         config.dev = iodev->dev;
 550         config.regmap = iodev->regmap;
 551         config.driver_data = max77802;
 552         platform_set_drvdata(pdev, max77802);
 553
 554         for (i = 0; i < MAX77802_REG_MAX; i++) {
 555                 struct regulator_dev *rdev;
 556                 int id = regulators[i].id;
 557                 int shift = max77802_get_opmode_shift(id);
 558                 int ret;
 559
 560                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 561                 if (ret < 0) {
 562                         dev_warn(&pdev->dev,
 563                                 "cannot read current mode for %d\n", i);
 564                         val = MAX77802_OPMODE_NORMAL;
 565                 } else {
 566                         val = val >> shift & MAX77802_OPMODE_MASK;
 567                 }
 568
 569                 /*
 570                  * If the regulator is disabled and the system warm rebooted,
 571                  * the hardware reports OFF as the regulator operating mode.
 572                  * Default to operating mode NORMAL in that case.
 573                  */
 574                 if (val == MAX77802_STATUS_OFF)
 575                         max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 576                 else
 577                         max77802->opmode[id] = val;
 578
 579                 rdev = devm_regulator_register(&pdev->dev,
 580                                                &regulators[i], &config);
 581                 if (IS_ERR(rdev)) {
 582                         ret = PTR_ERR(rdev);
 583                         dev_err(&pdev->dev,
 584                                 "regulator init failed for %d: %d\n", i, ret);
 585                         return ret;
 586                 }
 587         }
 588
 589         return 0;
 590 }
 591
 592 static const struct platform_device_id max77802_pmic_id[] = {
 593         {"max77802-pmic", 0},
 594         { },
 595 };
 596 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 597
 598 static struct platform_driver max77802_pmic_driver = {
 599         .driver = {
 600                 .name = "max77802-pmic",
 601         },
 602         .probe = max77802_pmic_probe,
 603         .id_table = max77802_pmic_id,
 604 };
 605
 606 module_platform_driver(max77802_pmic_driver);
 607
 608 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 609 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 610 MODULE_LICENSE("GPL");