drivers/regulator/max77802-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max77802.c - Regulator driver for the Maxim 77802
   4 //
   5 // Copyright (C) 2013-2014 Google, Inc
   6 // Simon Glass <sjg@chromium.org>
   7 //
   8 // Copyright (C) 2012 Samsung Electronics
   9 // Chiwoong Byun <woong.byun@samsung.com>
  10 // Jonghwa Lee <jonghwa3.lee@samsung.com>
  11 //
  12 // This driver is based on max8997.c
  13
  14 #include <linux/kernel.h>
  15 #include <linux/bug.h>
  16 #include <linux/err.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/machine.h>
  22 #include <linux/regulator/of_regulator.h>
  23 #include <linux/mfd/max77686.h>
  24 #include <linux/mfd/max77686-private.h>
  25 #include <dt-bindings/regulator/maxim,max77802.h>
  26
  27 /* Default ramp delay in case it is not manually set */
  28 #define MAX77802_RAMP_DELAY             100000          /* uV/us */
  29
  30 #define MAX77802_OPMODE_SHIFT_LDO       6
  31 #define MAX77802_OPMODE_BUCK234_SHIFT   4
  32 #define MAX77802_OPMODE_MASK            0x3
  33
  34 #define MAX77802_VSEL_MASK              0x3F
  35 #define MAX77802_DVS_VSEL_MASK          0xFF
  36
  37 #define MAX77802_RAMP_RATE_MASK_2BIT    0xC0
  38 #define MAX77802_RAMP_RATE_SHIFT_2BIT   6
  39 #define MAX77802_RAMP_RATE_MASK_4BIT    0xF0
  40 #define MAX77802_RAMP_RATE_SHIFT_4BIT   4
  41
  42 #define MAX77802_STATUS_OFF             0x0
  43 #define MAX77802_OFF_PWRREQ             0x1
  44 #define MAX77802_LP_PWRREQ              0x2
  45
  46 /* MAX77802 has two register formats: 2-bit and 4-bit */
  47 static const unsigned int ramp_table_77802_2bit[] = {
  48         12500,
  49         25000,
  50         50000,
  51         100000,
  52 };
  53
  54 static unsigned int ramp_table_77802_4bit[] = {
  55         1000,   2000,   3030,   4000,
  56         5000,   5880,   7140,   8330,
  57         9090,   10000,  11110,  12500,
  58         16670,  25000,  50000,  100000,
  59 };
  60
  61 struct max77802_regulator_prv {
  62         /* Array indexed by regulator id */
  63         unsigned int opmode[MAX77802_REG_MAX];
  64 };
  65
  66 static inline unsigned int max77802_map_mode(unsigned int mode)
  67 {
  68         return mode == MAX77802_OPMODE_NORMAL ?
  69                 REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
  70 }
  71
  72 static int max77802_get_opmode_shift(int id)
  73 {
  74         if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
  75                                      id <= MAX77802_BUCK10))
  76                 return 0;
  77
  78         if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
  79                 return MAX77802_OPMODE_BUCK234_SHIFT;
  80
  81         if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
  82                 return MAX77802_OPMODE_SHIFT_LDO;
  83
  84         return -EINVAL;
  85 }
  86
  87 /**
  88  * max77802_set_suspend_disable - Disable the regulator during system suspend
  89  * @rdev: regulator to mark as disabled
  90  *
  91  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
  92  * Configure the regulator so the PMIC will turn it OFF during system suspend.
  93  */
  94 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
  95 {
  96         unsigned int val = MAX77802_OFF_PWRREQ;
  97         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
  98         int id = rdev_get_id(rdev);
  99         int shift = max77802_get_opmode_shift(id);
 100
 101         max77802->opmode[id] = val;
 102         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 103                                   rdev->desc->enable_mask, val << shift);
 104 }
 105
 106 /*
 107  * Some LDOs support Low Power Mode while the system is running.
 108  *
 109  * LDOs 1, 3, 20, 21.
 110  */
 111 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
 112 {
 113         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 114         int id = rdev_get_id(rdev);
 115         unsigned int val;
 116         int shift = max77802_get_opmode_shift(id);
 117
 118         switch (mode) {
 119         case REGULATOR_MODE_STANDBY:
 120                 val = MAX77802_OPMODE_LP;       /* ON in Low Power Mode */
 121                 break;
 122         case REGULATOR_MODE_NORMAL:
 123                 val = MAX77802_OPMODE_NORMAL;   /* ON in Normal Mode */
 124                 break;
 125         default:
 126                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 127                          rdev->desc->name, mode);
 128                 return -EINVAL;
 129         }
 130
 131         max77802->opmode[id] = val;
 132         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 133                                   rdev->desc->enable_mask, val << shift);
 134 }
 135
 136 static unsigned max77802_get_mode(struct regulator_dev *rdev)
 137 {
 138         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 139         int id = rdev_get_id(rdev);
 140
 141         return max77802_map_mode(max77802->opmode[id]);
 142 }
 143
 144 /**
 145  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
 146  * @rdev: regulator to change mode
 147  * @mode: operating mode to be set
 148  *
 149  * Will set the operating mode for the regulators during system suspend.
 150  * This function is valid for the three different enable control logics:
 151  *
 152  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
 153  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
 154  * Enable Control Logic3 by PWRREQ (LDO 3)
 155  *
 156  * If setting the regulator mode fails, the function only warns but does
 157  * not return an error code to avoid the regulator core to stop setting
 158  * the operating mode for the remaining regulators.
 159  */
 160 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 161                                      unsigned int mode)
 162 {
 163         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 164         int id = rdev_get_id(rdev);
 165         unsigned int val;
 166         int shift = max77802_get_opmode_shift(id);
 167
 168         /*
 169          * If the regulator has been disabled for suspend
 170          * then is invalid to try setting a suspend mode.
 171          */
 172         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
 173                 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 174                          rdev->desc->name, mode);
 175                 return 0;
 176         }
 177
 178         switch (mode) {
 179         case REGULATOR_MODE_STANDBY:
 180                 /*
 181                  * If the regulator opmode is normal then enable
 182                  * ON in Low Power Mode by PWRREQ. If the mode is
 183                  * already Low Power then no action is required.
 184                  */
 185                 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
 186                         val = MAX77802_LP_PWRREQ;
 187                 else
 188                         return 0;
 189                 break;
 190         case REGULATOR_MODE_NORMAL:
 191                 /*
 192                  * If the regulator operating mode is Low Power then
 193                  * normal is not a valid opmode in suspend. If the
 194                  * mode is already normal then no action is required.
 195                  */
 196                 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
 197                         dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
 198                                  rdev->desc->name, mode);
 199                 return 0;
 200         default:
 201                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 202                          rdev->desc->name, mode);
 203                 return -EINVAL;
 204         }
 205
 206         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 207                                   rdev->desc->enable_mask, val << shift);
 208 }
 209
 210 static int max77802_enable(struct regulator_dev *rdev)
 211 {
 212         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 213         int id = rdev_get_id(rdev);
 214         int shift = max77802_get_opmode_shift(id);
 215
 216         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 217                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 218
 219         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 220                                   rdev->desc->enable_mask,
 221                                   max77802->opmode[id] << shift);
 222 }
 223
 224 static int max77802_find_ramp_value(struct regulator_dev *rdev,
 225                                     const unsigned int limits[], int size,
 226                                     unsigned int ramp_delay)
 227 {
 228         int i;
 229
 230         for (i = 0; i < size; i++) {
 231                 if (ramp_delay <= limits[i])
 232                         return i;
 233         }
 234
 235         /* Use maximum value for no ramp control */
 236         dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
 237                  rdev->desc->name, ramp_delay);
 238         return size - 1;
 239 }
 240
 241 /* Used for BUCKs 2-4 */
 242 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
 243                                         int ramp_delay)
 244 {
 245         int id = rdev_get_id(rdev);
 246         unsigned int ramp_value;
 247
 248         if (id > MAX77802_BUCK4) {
 249                 dev_warn(&rdev->dev,
 250                          "%s: regulator: ramp delay not supported\n",
 251                          rdev->desc->name);
 252                 return -EINVAL;
 253         }
 254         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
 255                                 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
 256
 257         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 258                                   MAX77802_RAMP_RATE_MASK_2BIT,
 259                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
 260 }
 261
 262 /* For BUCK1, 6 */
 263 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
 264                                             int ramp_delay)
 265 {
 266         unsigned int ramp_value;
 267
 268         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
 269                                 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
 270
 271         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 272                                   MAX77802_RAMP_RATE_MASK_4BIT,
 273                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
 274 }
 275
 276 /*
 277  * LDOs 2, 4-19, 22-35
 278  */
 279 static const struct regulator_ops max77802_ldo_ops_logic1 = {
 280         .list_voltage           = regulator_list_voltage_linear,
 281         .map_voltage            = regulator_map_voltage_linear,
 282         .is_enabled             = regulator_is_enabled_regmap,
 283         .enable                 = max77802_enable,
 284         .disable                = regulator_disable_regmap,
 285         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 286         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 287         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 288         .set_suspend_disable    = max77802_set_suspend_disable,
 289         .set_suspend_mode       = max77802_set_suspend_mode,
 290 };
 291
 292 /*
 293  * LDOs 1, 20, 21, 3
 294  */
 295 static const struct regulator_ops max77802_ldo_ops_logic2 = {
 296         .list_voltage           = regulator_list_voltage_linear,
 297         .map_voltage            = regulator_map_voltage_linear,
 298         .is_enabled             = regulator_is_enabled_regmap,
 299         .enable                 = max77802_enable,
 300         .disable                = regulator_disable_regmap,
 301         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 302         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 303         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 304         .set_mode               = max77802_set_mode,
 305         .get_mode               = max77802_get_mode,
 306         .set_suspend_mode       = max77802_set_suspend_mode,
 307 };
 308
 309 /* BUCKS 1, 6 */
 310 static const struct regulator_ops max77802_buck_16_dvs_ops = {
 311         .list_voltage           = regulator_list_voltage_linear,
 312         .map_voltage            = regulator_map_voltage_linear,
 313         .is_enabled             = regulator_is_enabled_regmap,
 314         .enable                 = max77802_enable,
 315         .disable                = regulator_disable_regmap,
 316         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 317         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 318         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 319         .set_ramp_delay         = max77802_set_ramp_delay_4bit,
 320         .set_suspend_disable    = max77802_set_suspend_disable,
 321 };
 322
 323 /* BUCKs 2-4 */
 324 static const struct regulator_ops max77802_buck_234_ops = {
 325         .list_voltage           = regulator_list_voltage_linear,
 326         .map_voltage            = regulator_map_voltage_linear,
 327         .is_enabled             = regulator_is_enabled_regmap,
 328         .enable                 = max77802_enable,
 329         .disable                = regulator_disable_regmap,
 330         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 331         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 332         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 333         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 334         .set_suspend_disable    = max77802_set_suspend_disable,
 335         .set_suspend_mode       = max77802_set_suspend_mode,
 336 };
 337
 338 /* BUCKs 5, 7-10 */
 339 static const struct regulator_ops max77802_buck_dvs_ops = {
 340         .list_voltage           = regulator_list_voltage_linear,
 341         .map_voltage            = regulator_map_voltage_linear,
 342         .is_enabled             = regulator_is_enabled_regmap,
 343         .enable                 = max77802_enable,
 344         .disable                = regulator_disable_regmap,
 345         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 346         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 347         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 348         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 349         .set_suspend_disable    = max77802_set_suspend_disable,
 350 };
 351
 352 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 353 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 354         .name           = "LDO"#num,                                    \
 355         .of_match       = of_match_ptr("LDO"#num),                      \
 356         .regulators_node        = of_match_ptr("regulators"),           \
 357         .id             = MAX77802_LDO##num,                            \
 358         .supply_name    = "inl"#supply,                                 \
 359         .ops            = &max77802_ldo_ops_logic##log,                 \
 360         .type           = REGULATOR_VOLTAGE,                            \
 361         .owner          = THIS_MODULE,                                  \
 362         .min_uV         = 800000,                                       \
 363         .uV_step        = 50000,                                        \
 364         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 365         .n_voltages     = 1 << 6,                                       \
 366         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 367         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 368         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 369         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 370         .of_map_mode    = max77802_map_mode,                            \
 371 }
 372
 373 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 374 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 375         .name           = "LDO"#num,                                    \
 376         .of_match       = of_match_ptr("LDO"#num),                      \
 377         .regulators_node        = of_match_ptr("regulators"),           \
 378         .id             = MAX77802_LDO##num,                            \
 379         .supply_name    = "inl"#supply,                                 \
 380         .ops            = &max77802_ldo_ops_logic##log,                 \
 381         .type           = REGULATOR_VOLTAGE,                            \
 382         .owner          = THIS_MODULE,                                  \
 383         .min_uV         = 800000,                                       \
 384         .uV_step        = 25000,                                        \
 385         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 386         .n_voltages     = 1 << 6,                                       \
 387         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 388         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 389         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 390         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 391         .of_map_mode    = max77802_map_mode,                            \
 392 }
 393
 394 /* BUCKs 1, 6 */
 395 #define regulator_77802_desc_16_buck(num)       {               \
 396         .name           = "BUCK"#num,                                   \
 397         .of_match       = of_match_ptr("BUCK"#num),                     \
 398         .regulators_node        = of_match_ptr("regulators"),           \
 399         .id             = MAX77802_BUCK##num,                           \
 400         .supply_name    = "inb"#num,                                    \
 401         .ops            = &max77802_buck_16_dvs_ops,                    \
 402         .type           = REGULATOR_VOLTAGE,                            \
 403         .owner          = THIS_MODULE,                                  \
 404         .min_uV         = 612500,                                       \
 405         .uV_step        = 6250,                                         \
 406         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 407         .n_voltages     = 1 << 8,                                       \
 408         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 409         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 410         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 411         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 412         .of_map_mode    = max77802_map_mode,                            \
 413 }
 414
 415 /* BUCKS 2-4 */
 416 #define regulator_77802_desc_234_buck(num)      {               \
 417         .name           = "BUCK"#num,                                   \
 418         .of_match       = of_match_ptr("BUCK"#num),                     \
 419         .regulators_node        = of_match_ptr("regulators"),           \
 420         .id             = MAX77802_BUCK##num,                           \
 421         .supply_name    = "inb"#num,                                    \
 422         .ops            = &max77802_buck_234_ops,                       \
 423         .type           = REGULATOR_VOLTAGE,                            \
 424         .owner          = THIS_MODULE,                                  \
 425         .min_uV         = 600000,                                       \
 426         .uV_step        = 6250,                                         \
 427         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 428         .n_voltages     = 0x91,                                         \
 429         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 430         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 431         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 432         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 433                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 434         .of_map_mode    = max77802_map_mode,                            \
 435 }
 436
 437 /* BUCK 5 */
 438 #define regulator_77802_desc_buck5(num)         {               \
 439         .name           = "BUCK"#num,                                   \
 440         .of_match       = of_match_ptr("BUCK"#num),                     \
 441         .regulators_node        = of_match_ptr("regulators"),           \
 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         .of_map_mode    = max77802_map_mode,                            \
 456 }
 457
 458 /* BUCKs 7-10 */
 459 #define regulator_77802_desc_buck7_10(num)      {               \
 460         .name           = "BUCK"#num,                                   \
 461         .of_match       = of_match_ptr("BUCK"#num),                     \
 462         .regulators_node        = of_match_ptr("regulators"),           \
 463         .id             = MAX77802_BUCK##num,                           \
 464         .supply_name    = "inb"#num,                                    \
 465         .ops            = &max77802_buck_dvs_ops,                       \
 466         .type           = REGULATOR_VOLTAGE,                            \
 467         .owner          = THIS_MODULE,                                  \
 468         .min_uV         = 750000,                                       \
 469         .uV_step        = 50000,                                        \
 470         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 471         .n_voltages     = 1 << 6,                                       \
 472         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 473         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 474         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 475         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 476         .of_map_mode    = max77802_map_mode,                            \
 477 }
 478
 479 static const struct regulator_desc regulators[] = {
 480         regulator_77802_desc_16_buck(1),
 481         regulator_77802_desc_234_buck(2),
 482         regulator_77802_desc_234_buck(3),
 483         regulator_77802_desc_234_buck(4),
 484         regulator_77802_desc_buck5(5),
 485         regulator_77802_desc_16_buck(6),
 486         regulator_77802_desc_buck7_10(7),
 487         regulator_77802_desc_buck7_10(8),
 488         regulator_77802_desc_buck7_10(9),
 489         regulator_77802_desc_buck7_10(10),
 490         regulator_77802_desc_n_ldo(1, 10, 2),
 491         regulator_77802_desc_n_ldo(2, 10, 1),
 492         regulator_77802_desc_p_ldo(3, 3, 2),
 493         regulator_77802_desc_p_ldo(4, 6, 1),
 494         regulator_77802_desc_p_ldo(5, 3, 1),
 495         regulator_77802_desc_p_ldo(6, 3, 1),
 496         regulator_77802_desc_p_ldo(7, 3, 1),
 497         regulator_77802_desc_n_ldo(8, 1, 1),
 498         regulator_77802_desc_p_ldo(9, 5, 1),
 499         regulator_77802_desc_p_ldo(10, 4, 1),
 500         regulator_77802_desc_p_ldo(11, 4, 1),
 501         regulator_77802_desc_p_ldo(12, 9, 1),
 502         regulator_77802_desc_p_ldo(13, 4, 1),
 503         regulator_77802_desc_p_ldo(14, 4, 1),
 504         regulator_77802_desc_n_ldo(15, 1, 1),
 505         regulator_77802_desc_n_ldo(17, 2, 1),
 506         regulator_77802_desc_p_ldo(18, 7, 1),
 507         regulator_77802_desc_p_ldo(19, 5, 1),
 508         regulator_77802_desc_p_ldo(20, 7, 2),
 509         regulator_77802_desc_p_ldo(21, 6, 2),
 510         regulator_77802_desc_p_ldo(23, 9, 1),
 511         regulator_77802_desc_p_ldo(24, 6, 1),
 512         regulator_77802_desc_p_ldo(25, 9, 1),
 513         regulator_77802_desc_p_ldo(26, 9, 1),
 514         regulator_77802_desc_n_ldo(27, 2, 1),
 515         regulator_77802_desc_p_ldo(28, 7, 1),
 516         regulator_77802_desc_p_ldo(29, 7, 1),
 517         regulator_77802_desc_n_ldo(30, 2, 1),
 518         regulator_77802_desc_p_ldo(32, 9, 1),
 519         regulator_77802_desc_p_ldo(33, 6, 1),
 520         regulator_77802_desc_p_ldo(34, 9, 1),
 521         regulator_77802_desc_n_ldo(35, 2, 1),
 522 };
 523
 524 static int max77802_pmic_probe(struct platform_device *pdev)
 525 {
 526         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 527         struct max77802_regulator_prv *max77802;
 528         int i, val;
 529         struct regulator_config config = { };
 530
 531         max77802 = devm_kzalloc(&pdev->dev,
 532                                 sizeof(struct max77802_regulator_prv),
 533                                 GFP_KERNEL);
 534         if (!max77802)
 535                 return -ENOMEM;
 536
 537         config.dev = iodev->dev;
 538         config.regmap = iodev->regmap;
 539         config.driver_data = max77802;
 540         platform_set_drvdata(pdev, max77802);
 541
 542         for (i = 0; i < MAX77802_REG_MAX; i++) {
 543                 struct regulator_dev *rdev;
 544                 int id = regulators[i].id;
 545                 int shift = max77802_get_opmode_shift(id);
 546                 int ret;
 547
 548                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 549                 if (ret < 0) {
 550                         dev_warn(&pdev->dev,
 551                                 "cannot read current mode for %d\n", i);
 552                         val = MAX77802_OPMODE_NORMAL;
 553                 } else {
 554                         val = val >> shift & MAX77802_OPMODE_MASK;
 555                 }
 556
 557                 /*
 558                  * If the regulator is disabled and the system warm rebooted,
 559                  * the hardware reports OFF as the regulator operating mode.
 560                  * Default to operating mode NORMAL in that case.
 561                  */
 562                 if (val == MAX77802_STATUS_OFF)
 563                         max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 564                 else
 565                         max77802->opmode[id] = val;
 566
 567                 rdev = devm_regulator_register(&pdev->dev,
 568                                                &regulators[i], &config);
 569                 if (IS_ERR(rdev)) {
 570                         ret = PTR_ERR(rdev);
 571                         dev_err(&pdev->dev,
 572                                 "regulator init failed for %d: %d\n", i, ret);
 573                         return ret;
 574                 }
 575         }
 576
 577         return 0;
 578 }
 579
 580 static const struct platform_device_id max77802_pmic_id[] = {
 581         {"max77802-pmic", 0},
 582         { },
 583 };
 584 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 585
 586 static struct platform_driver max77802_pmic_driver = {
 587         .driver = {
 588                 .name = "max77802-pmic",
 589         },
 590         .probe = max77802_pmic_probe,
 591         .id_table = max77802_pmic_id,
 592 };
 593
 594 module_platform_driver(max77802_pmic_driver);
 595
 596 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 597 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 598 MODULE_LICENSE("GPL");