drivers/regulator/max77802.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@smasung.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/platform_device.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/regulator/of_regulator.h>
  34 #include <linux/mfd/max77686.h>
  35 #include <linux/mfd/max77686-private.h>
  36 #include <dt-bindings/regulator/maxim,max77802.h>
  37
  38 /* Default ramp delay in case it is not manually set */
  39 #define MAX77802_RAMP_DELAY             100000          /* uV/us */
  40
  41 #define MAX77802_OPMODE_SHIFT_LDO       6
  42 #define MAX77802_OPMODE_BUCK234_SHIFT   4
  43 #define MAX77802_OPMODE_MASK            0x3
  44
  45 #define MAX77802_VSEL_MASK              0x3F
  46 #define MAX77802_DVS_VSEL_MASK          0xFF
  47
  48 #define MAX77802_RAMP_RATE_MASK_2BIT    0xC0
  49 #define MAX77802_RAMP_RATE_SHIFT_2BIT   6
  50 #define MAX77802_RAMP_RATE_MASK_4BIT    0xF0
  51 #define MAX77802_RAMP_RATE_SHIFT_4BIT   4
  52
  53 #define MAX77802_STATUS_OFF             0x0
  54 #define MAX77802_OFF_PWRREQ             0x1
  55 #define MAX77802_LP_PWRREQ              0x2
  56
  57 /* MAX77802 has two register formats: 2-bit and 4-bit */
  58 static const unsigned int ramp_table_77802_2bit[] = {
  59         12500,
  60         25000,
  61         50000,
  62         100000,
  63 };
  64
  65 static unsigned int ramp_table_77802_4bit[] = {
  66         1000,   2000,   3030,   4000,
  67         5000,   5880,   7140,   8330,
  68         9090,   10000,  11110,  12500,
  69         16670,  25000,  50000,  100000,
  70 };
  71
  72 struct max77802_regulator_prv {
  73         unsigned int opmode[MAX77802_REG_MAX];
  74 };
  75
  76 static inline int max77802_map_mode(int mode)
  77 {
  78         return mode == MAX77802_OPMODE_NORMAL ?
  79                 REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
  80 }
  81
  82 static int max77802_get_opmode_shift(int id)
  83 {
  84         if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
  85                                      id <= MAX77802_BUCK10))
  86                 return 0;
  87
  88         if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
  89                 return MAX77802_OPMODE_BUCK234_SHIFT;
  90
  91         if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
  92                 return MAX77802_OPMODE_SHIFT_LDO;
  93
  94         return -EINVAL;
  95 }
  96
  97 /**
  98  * max77802_set_suspend_disable - Disable the regulator during system suspend
  99  * @rdev: regulator to mark as disabled
 100  *
 101  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
 102  * Configure the regulator so the PMIC will turn it OFF during system suspend.
 103  */
 104 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
 105 {
 106         unsigned int val = MAX77802_OFF_PWRREQ;
 107         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 108         int id = rdev_get_id(rdev);
 109         int shift = max77802_get_opmode_shift(id);
 110
 111         max77802->opmode[id] = val;
 112         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 113                                   rdev->desc->enable_mask, val << shift);
 114 }
 115
 116 /*
 117  * Some LDOs support Low Power Mode while the system is running.
 118  *
 119  * LDOs 1, 3, 20, 21.
 120  */
 121 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
 122 {
 123         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 124         int id = rdev_get_id(rdev);
 125         unsigned int val;
 126         int shift = max77802_get_opmode_shift(id);
 127
 128         switch (mode) {
 129         case REGULATOR_MODE_STANDBY:
 130                 val = MAX77802_OPMODE_LP;       /* ON in Low Power Mode */
 131                 break;
 132         case REGULATOR_MODE_NORMAL:
 133                 val = MAX77802_OPMODE_NORMAL;   /* ON in Normal Mode */
 134                 break;
 135         default:
 136                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 137                          rdev->desc->name, mode);
 138                 return -EINVAL;
 139         }
 140
 141         max77802->opmode[id] = val;
 142         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 143                                   rdev->desc->enable_mask, val << shift);
 144 }
 145
 146 static unsigned max77802_get_mode(struct regulator_dev *rdev)
 147 {
 148         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 149         int id = rdev_get_id(rdev);
 150
 151         return max77802_map_mode(max77802->opmode[id]);
 152 }
 153
 154 /**
 155  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
 156  * @rdev: regulator to change mode
 157  * @mode: operating mode to be set
 158  *
 159  * Will set the operating mode for the regulators during system suspend.
 160  * This function is valid for the three different enable control logics:
 161  *
 162  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
 163  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
 164  * Enable Control Logic3 by PWRREQ (LDO 3)
 165  *
 166  * If setting the regulator mode fails, the function only warns but does
 167  * not return an error code to avoid the regulator core to stop setting
 168  * the operating mode for the remaining regulators.
 169  */
 170 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 171                                      unsigned int mode)
 172 {
 173         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 174         int id = rdev_get_id(rdev);
 175         unsigned int val;
 176         int shift = max77802_get_opmode_shift(id);
 177
 178         /*
 179          * If the regulator has been disabled for suspend
 180          * then is invalid to try setting a suspend mode.
 181          */
 182         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
 183                 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 184                          rdev->desc->name, mode);
 185                 return 0;
 186         }
 187
 188         switch (mode) {
 189         case REGULATOR_MODE_STANDBY:
 190                 /*
 191                  * If the regulator opmode is normal then enable
 192                  * ON in Low Power Mode by PWRREQ. If the mode is
 193                  * already Low Power then no action is required.
 194                  */
 195                 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
 196                         val = MAX77802_LP_PWRREQ;
 197                 else
 198                         return 0;
 199                 break;
 200         case REGULATOR_MODE_NORMAL:
 201                 /*
 202                  * If the regulator operating mode is Low Power then
 203                  * normal is not a valid opmode in suspend. If the
 204                  * mode is already normal then no action is required.
 205                  */
 206                 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
 207                         dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
 208                                  rdev->desc->name, mode);
 209                 return 0;
 210         default:
 211                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 212                          rdev->desc->name, mode);
 213                 return -EINVAL;
 214         }
 215
 216         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 217                                   rdev->desc->enable_mask, val << shift);
 218 }
 219
 220 static int max77802_enable(struct regulator_dev *rdev)
 221 {
 222         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 223         int id = rdev_get_id(rdev);
 224         int shift = max77802_get_opmode_shift(id);
 225
 226         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 227                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 228
 229         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 230                                   rdev->desc->enable_mask,
 231                                   max77802->opmode[id] << shift);
 232 }
 233
 234 static int max77802_find_ramp_value(struct regulator_dev *rdev,
 235                                     const unsigned int limits[], int size,
 236                                     unsigned int ramp_delay)
 237 {
 238         int i;
 239
 240         for (i = 0; i < size; i++) {
 241                 if (ramp_delay <= limits[i])
 242                         return i;
 243         }
 244
 245         /* Use maximum value for no ramp control */
 246         dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
 247                  rdev->desc->name, ramp_delay);
 248         return size - 1;
 249 }
 250
 251 /* Used for BUCKs 2-4 */
 252 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
 253                                         int ramp_delay)
 254 {
 255         int id = rdev_get_id(rdev);
 256         unsigned int ramp_value;
 257
 258         if (id > MAX77802_BUCK4) {
 259                         dev_warn(&rdev->dev,
 260                                  "%s: regulator: ramp delay not supported\n",
 261                                  rdev->desc->name);
 262                 return -EINVAL;
 263         }
 264         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
 265                                 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
 266
 267         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 268                                   MAX77802_RAMP_RATE_MASK_2BIT,
 269                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
 270 }
 271
 272 /* For BUCK1, 6 */
 273 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
 274                                             int ramp_delay)
 275 {
 276         unsigned int ramp_value;
 277
 278         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
 279                                 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
 280
 281         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 282                                   MAX77802_RAMP_RATE_MASK_4BIT,
 283                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
 284 }
 285
 286 /*
 287  * LDOs 2, 4-19, 22-35
 288  */
 289 static struct regulator_ops max77802_ldo_ops_logic1 = {
 290         .list_voltage           = regulator_list_voltage_linear,
 291         .map_voltage            = regulator_map_voltage_linear,
 292         .is_enabled             = regulator_is_enabled_regmap,
 293         .enable                 = max77802_enable,
 294         .disable                = regulator_disable_regmap,
 295         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 296         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 297         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 298         .set_suspend_enable     = max77802_enable,
 299         .set_suspend_disable    = max77802_set_suspend_disable,
 300         .set_suspend_mode       = max77802_set_suspend_mode,
 301 };
 302
 303 /*
 304  * LDOs 1, 20, 21, 3
 305  */
 306 static struct regulator_ops max77802_ldo_ops_logic2 = {
 307         .list_voltage           = regulator_list_voltage_linear,
 308         .map_voltage            = regulator_map_voltage_linear,
 309         .is_enabled             = regulator_is_enabled_regmap,
 310         .enable                 = max77802_enable,
 311         .disable                = regulator_disable_regmap,
 312         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 313         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 314         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 315         .set_mode               = max77802_set_mode,
 316         .get_mode               = max77802_get_mode,
 317         .set_suspend_mode       = max77802_set_suspend_mode,
 318 };
 319
 320 /* BUCKS 1, 6 */
 321 static struct regulator_ops max77802_buck_16_dvs_ops = {
 322         .list_voltage           = regulator_list_voltage_linear,
 323         .map_voltage            = regulator_map_voltage_linear,
 324         .is_enabled             = regulator_is_enabled_regmap,
 325         .enable                 = max77802_enable,
 326         .disable                = regulator_disable_regmap,
 327         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 328         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 329         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 330         .set_ramp_delay         = max77802_set_ramp_delay_4bit,
 331         .set_suspend_enable     = max77802_enable,
 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_enable     = max77802_enable,
 347         .set_suspend_disable    = max77802_set_suspend_disable,
 348         .set_suspend_mode       = max77802_set_suspend_mode,
 349 };
 350
 351 /* BUCKs 5, 7-10 */
 352 static struct regulator_ops max77802_buck_dvs_ops = {
 353         .list_voltage           = regulator_list_voltage_linear,
 354         .map_voltage            = regulator_map_voltage_linear,
 355         .is_enabled             = regulator_is_enabled_regmap,
 356         .enable                 = max77802_enable,
 357         .disable                = regulator_disable_regmap,
 358         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 359         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 360         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 361         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 362         .set_suspend_enable     = max77802_enable,
 363         .set_suspend_disable    = max77802_set_suspend_disable,
 364 };
 365
 366 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 367 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 368         .name           = "LDO"#num,                                    \
 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 }
 383
 384 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 385 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 386         .name           = "LDO"#num,                                    \
 387         .id             = MAX77802_LDO##num,                            \
 388         .supply_name    = "inl"#supply,                                 \
 389         .ops            = &max77802_ldo_ops_logic##log,                 \
 390         .type           = REGULATOR_VOLTAGE,                            \
 391         .owner          = THIS_MODULE,                                  \
 392         .min_uV         = 800000,                                       \
 393         .uV_step        = 25000,                                        \
 394         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 395         .n_voltages     = 1 << 6,                                       \
 396         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 397         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 398         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 399         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 400 }
 401
 402 /* BUCKs 1, 6 */
 403 #define regulator_77802_desc_16_buck(num)       {               \
 404         .name           = "BUCK"#num,                                   \
 405         .id             = MAX77802_BUCK##num,                           \
 406         .supply_name    = "inb"#num,                                    \
 407         .ops            = &max77802_buck_16_dvs_ops,                    \
 408         .type           = REGULATOR_VOLTAGE,                            \
 409         .owner          = THIS_MODULE,                                  \
 410         .min_uV         = 612500,                                       \
 411         .uV_step        = 6250,                                         \
 412         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 413         .n_voltages     = 1 << 8,                                       \
 414         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 415         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 416         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 417         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 418 }
 419
 420 /* BUCKS 2-4 */
 421 #define regulator_77802_desc_234_buck(num)      {               \
 422         .name           = "BUCK"#num,                                   \
 423         .id             = MAX77802_BUCK##num,                           \
 424         .supply_name    = "inb"#num,                                    \
 425         .ops            = &max77802_buck_234_ops,                       \
 426         .type           = REGULATOR_VOLTAGE,                            \
 427         .owner          = THIS_MODULE,                                  \
 428         .min_uV         = 600000,                                       \
 429         .uV_step        = 6250,                                         \
 430         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 431         .n_voltages     = 0x91,                                         \
 432         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 433         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 434         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 435         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 436                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 437 }
 438
 439 /* BUCK 5 */
 440 #define regulator_77802_desc_buck5(num)         {               \
 441         .name           = "BUCK"#num,                                   \
 442         .id             = MAX77802_BUCK##num,                           \
 443         .supply_name    = "inb"#num,                                    \
 444         .ops            = &max77802_buck_dvs_ops,                       \
 445         .type           = REGULATOR_VOLTAGE,                            \
 446         .owner          = THIS_MODULE,                                  \
 447         .min_uV         = 750000,                                       \
 448         .uV_step        = 50000,                                        \
 449         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 450         .n_voltages     = 1 << 6,                                       \
 451         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 452         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 453         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 454         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 455 }
 456
 457 /* BUCKs 7-10 */
 458 #define regulator_77802_desc_buck7_10(num)      {               \
 459         .name           = "BUCK"#num,                                   \
 460         .id             = MAX77802_BUCK##num,                           \
 461         .supply_name    = "inb"#num,                                    \
 462         .ops            = &max77802_buck_dvs_ops,                       \
 463         .type           = REGULATOR_VOLTAGE,                            \
 464         .owner          = THIS_MODULE,                                  \
 465         .min_uV         = 750000,                                       \
 466         .uV_step        = 50000,                                        \
 467         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 468         .n_voltages     = 1 << 6,                                       \
 469         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 470         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 471         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 472         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 473 }
 474
 475 static struct regulator_desc regulators[] = {
 476         regulator_77802_desc_16_buck(1),
 477         regulator_77802_desc_234_buck(2),
 478         regulator_77802_desc_234_buck(3),
 479         regulator_77802_desc_234_buck(4),
 480         regulator_77802_desc_buck5(5),
 481         regulator_77802_desc_16_buck(6),
 482         regulator_77802_desc_buck7_10(7),
 483         regulator_77802_desc_buck7_10(8),
 484         regulator_77802_desc_buck7_10(9),
 485         regulator_77802_desc_buck7_10(10),
 486         regulator_77802_desc_n_ldo(1, 10, 2),
 487         regulator_77802_desc_n_ldo(2, 10, 1),
 488         regulator_77802_desc_p_ldo(3, 3, 2),
 489         regulator_77802_desc_p_ldo(4, 6, 1),
 490         regulator_77802_desc_p_ldo(5, 3, 1),
 491         regulator_77802_desc_p_ldo(6, 3, 1),
 492         regulator_77802_desc_p_ldo(7, 3, 1),
 493         regulator_77802_desc_n_ldo(8, 1, 1),
 494         regulator_77802_desc_p_ldo(9, 5, 1),
 495         regulator_77802_desc_p_ldo(10, 4, 1),
 496         regulator_77802_desc_p_ldo(11, 4, 1),
 497         regulator_77802_desc_p_ldo(12, 9, 1),
 498         regulator_77802_desc_p_ldo(13, 4, 1),
 499         regulator_77802_desc_p_ldo(14, 4, 1),
 500         regulator_77802_desc_n_ldo(15, 1, 1),
 501         regulator_77802_desc_n_ldo(17, 2, 1),
 502         regulator_77802_desc_p_ldo(18, 7, 1),
 503         regulator_77802_desc_p_ldo(19, 5, 1),
 504         regulator_77802_desc_p_ldo(20, 7, 2),
 505         regulator_77802_desc_p_ldo(21, 6, 2),
 506         regulator_77802_desc_p_ldo(23, 9, 1),
 507         regulator_77802_desc_p_ldo(24, 6, 1),
 508         regulator_77802_desc_p_ldo(25, 9, 1),
 509         regulator_77802_desc_p_ldo(26, 9, 1),
 510         regulator_77802_desc_n_ldo(27, 2, 1),
 511         regulator_77802_desc_p_ldo(28, 7, 1),
 512         regulator_77802_desc_p_ldo(29, 7, 1),
 513         regulator_77802_desc_n_ldo(30, 2, 1),
 514         regulator_77802_desc_p_ldo(32, 9, 1),
 515         regulator_77802_desc_p_ldo(33, 6, 1),
 516         regulator_77802_desc_p_ldo(34, 9, 1),
 517         regulator_77802_desc_n_ldo(35, 2, 1),
 518 };
 519
 520 #ifdef CONFIG_OF
 521 static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
 522                                         struct max77686_platform_data *pdata)
 523 {
 524         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 525         struct device_node *pmic_np, *regulators_np;
 526         struct max77686_regulator_data *rdata;
 527         struct of_regulator_match rmatch;
 528         unsigned int i;
 529
 530         pmic_np = iodev->dev->of_node;
 531         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 532         if (!regulators_np) {
 533                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 534                 return -EINVAL;
 535         }
 536
 537         pdata->num_regulators = ARRAY_SIZE(regulators);
 538         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 539                              pdata->num_regulators, GFP_KERNEL);
 540         if (!rdata) {
 541                 of_node_put(regulators_np);
 542                 return -ENOMEM;
 543         }
 544
 545         for (i = 0; i < pdata->num_regulators; i++) {
 546                 rmatch.name = regulators[i].name;
 547                 rmatch.init_data = NULL;
 548                 rmatch.of_node = NULL;
 549                 if (of_regulator_match(&pdev->dev, regulators_np, &rmatch,
 550                                        1) != 1) {
 551                         dev_warn(&pdev->dev, "No matching regulator for '%s'\n",
 552                                  rmatch.name);
 553                         continue;
 554                 }
 555                 rdata[i].initdata = rmatch.init_data;
 556                 rdata[i].of_node = rmatch.of_node;
 557                 rdata[i].id = regulators[i].id;
 558         }
 559
 560         pdata->regulators = rdata;
 561         of_node_put(regulators_np);
 562
 563         return 0;
 564 }
 565 #else
 566 static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
 567                                         struct max77686_platform_data *pdata)
 568 {
 569         return 0;
 570 }
 571 #endif /* CONFIG_OF */
 572
 573 static int max77802_pmic_probe(struct platform_device *pdev)
 574 {
 575         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 576         struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 577         struct max77802_regulator_prv *max77802;
 578         int i, ret = 0, val;
 579         struct regulator_config config = { };
 580
 581         /* This is allocated by the MFD driver */
 582         if (!pdata) {
 583                 dev_err(&pdev->dev, "no platform data found for regulator\n");
 584                 return -ENODEV;
 585         }
 586
 587         max77802 = devm_kzalloc(&pdev->dev,
 588                                 sizeof(struct max77802_regulator_prv),
 589                                 GFP_KERNEL);
 590         if (!max77802)
 591                 return -ENOMEM;
 592
 593         if (iodev->dev->of_node) {
 594                 ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
 595                 if (ret)
 596                         return ret;
 597         }
 598
 599         config.dev = iodev->dev;
 600         config.regmap = iodev->regmap;
 601         config.driver_data = max77802;
 602         platform_set_drvdata(pdev, max77802);
 603
 604         for (i = 0; i < MAX77802_REG_MAX; i++) {
 605                 struct regulator_dev *rdev;
 606                 int id = pdata->regulators[i].id;
 607                 int shift = max77802_get_opmode_shift(id);
 608
 609                 config.init_data = pdata->regulators[i].initdata;
 610                 config.of_node = pdata->regulators[i].of_node;
 611
 612                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 613                 val = val >> shift & MAX77802_OPMODE_MASK;
 614
 615                 /*
 616                  * If the regulator is disabled and the system warm rebooted,
 617                  * the hardware reports OFF as the regulator operating mode.
 618                  * Default to operating mode NORMAL in that case.
 619                  */
 620                 if (val == MAX77802_STATUS_OFF)
 621                         max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 622                 else
 623                         max77802->opmode[id] = val;
 624
 625                 rdev = devm_regulator_register(&pdev->dev,
 626                                                &regulators[i], &config);
 627                 if (IS_ERR(rdev)) {
 628                         dev_err(&pdev->dev,
 629                                 "regulator init failed for %d\n", i);
 630                         return PTR_ERR(rdev);
 631                 }
 632         }
 633
 634         return 0;
 635 }
 636
 637 static const struct platform_device_id max77802_pmic_id[] = {
 638         {"max77802-pmic", 0},
 639         { },
 640 };
 641 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 642
 643 static struct platform_driver max77802_pmic_driver = {
 644         .driver = {
 645                 .name = "max77802-pmic",
 646                 .owner = THIS_MODULE,
 647         },
 648         .probe = max77802_pmic_probe,
 649         .id_table = max77802_pmic_id,
 650 };
 651
 652 module_platform_driver(max77802_pmic_driver);
 653
 654 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 655 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 656 MODULE_LICENSE("GPL");