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 static const unsigned int max77802_buck234_ramp_table[] = {
  47         12500,
  48         25000,
  49         50000,
  50         100000,
  51 };
  52
  53 static const unsigned int max77802_buck16_ramp_table[] = {
  54         1000,   2000,   3030,   4000,
  55         5000,   5880,   7140,   8330,
  56         9090,   10000,  11110,  12500,
  57         16670,  25000,  50000,  100000,
  58 };
  59
  60 struct max77802_regulator_prv {
  61         /* Array indexed by regulator id */
  62         unsigned int opmode[MAX77802_REG_MAX];
  63 };
  64
  65 static inline unsigned int max77802_map_mode(unsigned int mode)
  66 {
  67         return mode == MAX77802_OPMODE_NORMAL ?
  68                 REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
  69 }
  70
  71 static int max77802_get_opmode_shift(int id)
  72 {
  73         if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
  74                                      id <= MAX77802_BUCK10))
  75                 return 0;
  76
  77         if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
  78                 return MAX77802_OPMODE_BUCK234_SHIFT;
  79
  80         if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
  81                 return MAX77802_OPMODE_SHIFT_LDO;
  82
  83         return -EINVAL;
  84 }
  85
  86 /**
  87  * max77802_set_suspend_disable - Disable the regulator during system suspend
  88  * @rdev: regulator to mark as disabled
  89  *
  90  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
  91  * Configure the regulator so the PMIC will turn it OFF during system suspend.
  92  */
  93 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
  94 {
  95         unsigned int val = MAX77802_OFF_PWRREQ;
  96         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
  97         int id = rdev_get_id(rdev);
  98         int shift = max77802_get_opmode_shift(id);
  99
 100         max77802->opmode[id] = val;
 101         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 102                                   rdev->desc->enable_mask, val << shift);
 103 }
 104
 105 /*
 106  * Some LDOs support Low Power Mode while the system is running.
 107  *
 108  * LDOs 1, 3, 20, 21.
 109  */
 110 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
 111 {
 112         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 113         int id = rdev_get_id(rdev);
 114         unsigned int val;
 115         int shift = max77802_get_opmode_shift(id);
 116
 117         switch (mode) {
 118         case REGULATOR_MODE_STANDBY:
 119                 val = MAX77802_OPMODE_LP;       /* ON in Low Power Mode */
 120                 break;
 121         case REGULATOR_MODE_NORMAL:
 122                 val = MAX77802_OPMODE_NORMAL;   /* ON in Normal Mode */
 123                 break;
 124         default:
 125                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 126                          rdev->desc->name, mode);
 127                 return -EINVAL;
 128         }
 129
 130         max77802->opmode[id] = val;
 131         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 132                                   rdev->desc->enable_mask, val << shift);
 133 }
 134
 135 static unsigned max77802_get_mode(struct regulator_dev *rdev)
 136 {
 137         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 138         int id = rdev_get_id(rdev);
 139
 140         return max77802_map_mode(max77802->opmode[id]);
 141 }
 142
 143 /**
 144  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
 145  * @rdev: regulator to change mode
 146  * @mode: operating mode to be set
 147  *
 148  * Will set the operating mode for the regulators during system suspend.
 149  * This function is valid for the three different enable control logics:
 150  *
 151  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
 152  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
 153  * Enable Control Logic3 by PWRREQ (LDO 3)
 154  *
 155  * If setting the regulator mode fails, the function only warns but does
 156  * not return an error code to avoid the regulator core to stop setting
 157  * the operating mode for the remaining regulators.
 158  */
 159 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 160                                      unsigned int mode)
 161 {
 162         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 163         int id = rdev_get_id(rdev);
 164         unsigned int val;
 165         int shift = max77802_get_opmode_shift(id);
 166
 167         /*
 168          * If the regulator has been disabled for suspend
 169          * then is invalid to try setting a suspend mode.
 170          */
 171         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
 172                 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 173                          rdev->desc->name, mode);
 174                 return 0;
 175         }
 176
 177         switch (mode) {
 178         case REGULATOR_MODE_STANDBY:
 179                 /*
 180                  * If the regulator opmode is normal then enable
 181                  * ON in Low Power Mode by PWRREQ. If the mode is
 182                  * already Low Power then no action is required.
 183                  */
 184                 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
 185                         val = MAX77802_LP_PWRREQ;
 186                 else
 187                         return 0;
 188                 break;
 189         case REGULATOR_MODE_NORMAL:
 190                 /*
 191                  * If the regulator operating mode is Low Power then
 192                  * normal is not a valid opmode in suspend. If the
 193                  * mode is already normal then no action is required.
 194                  */
 195                 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
 196                         dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
 197                                  rdev->desc->name, mode);
 198                 return 0;
 199         default:
 200                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 201                          rdev->desc->name, mode);
 202                 return -EINVAL;
 203         }
 204
 205         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 206                                   rdev->desc->enable_mask, val << shift);
 207 }
 208
 209 static int max77802_enable(struct regulator_dev *rdev)
 210 {
 211         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 212         int id = rdev_get_id(rdev);
 213         int shift = max77802_get_opmode_shift(id);
 214
 215         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 216                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 217
 218         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 219                                   rdev->desc->enable_mask,
 220                                   max77802->opmode[id] << shift);
 221 }
 222
 223 /*
 224  * LDOs 2, 4-19, 22-35
 225  */
 226 static const struct regulator_ops max77802_ldo_ops_logic1 = {
 227         .list_voltage           = regulator_list_voltage_linear,
 228         .map_voltage            = regulator_map_voltage_linear,
 229         .is_enabled             = regulator_is_enabled_regmap,
 230         .enable                 = max77802_enable,
 231         .disable                = regulator_disable_regmap,
 232         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 233         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 234         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 235         .set_suspend_disable    = max77802_set_suspend_disable,
 236         .set_suspend_mode       = max77802_set_suspend_mode,
 237 };
 238
 239 /*
 240  * LDOs 1, 20, 21, 3
 241  */
 242 static const struct regulator_ops max77802_ldo_ops_logic2 = {
 243         .list_voltage           = regulator_list_voltage_linear,
 244         .map_voltage            = regulator_map_voltage_linear,
 245         .is_enabled             = regulator_is_enabled_regmap,
 246         .enable                 = max77802_enable,
 247         .disable                = regulator_disable_regmap,
 248         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 249         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 250         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 251         .set_mode               = max77802_set_mode,
 252         .get_mode               = max77802_get_mode,
 253         .set_suspend_mode       = max77802_set_suspend_mode,
 254 };
 255
 256 /* BUCKS 1, 6 */
 257 static const struct regulator_ops max77802_buck_16_dvs_ops = {
 258         .list_voltage           = regulator_list_voltage_linear,
 259         .map_voltage            = regulator_map_voltage_linear,
 260         .is_enabled             = regulator_is_enabled_regmap,
 261         .enable                 = max77802_enable,
 262         .disable                = regulator_disable_regmap,
 263         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 264         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 265         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 266         .set_ramp_delay         = regulator_set_ramp_delay_regmap,
 267         .set_suspend_disable    = max77802_set_suspend_disable,
 268 };
 269
 270 /* BUCKs 2-4 */
 271 static const struct regulator_ops max77802_buck_234_ops = {
 272         .list_voltage           = regulator_list_voltage_linear,
 273         .map_voltage            = regulator_map_voltage_linear,
 274         .is_enabled             = regulator_is_enabled_regmap,
 275         .enable                 = max77802_enable,
 276         .disable                = regulator_disable_regmap,
 277         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 278         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 279         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 280         .set_ramp_delay         = regulator_set_ramp_delay_regmap,
 281         .set_suspend_disable    = max77802_set_suspend_disable,
 282         .set_suspend_mode       = max77802_set_suspend_mode,
 283 };
 284
 285 /* BUCKs 5, 7-10 */
 286 static const struct regulator_ops max77802_buck_dvs_ops = {
 287         .list_voltage           = regulator_list_voltage_linear,
 288         .map_voltage            = regulator_map_voltage_linear,
 289         .is_enabled             = regulator_is_enabled_regmap,
 290         .enable                 = max77802_enable,
 291         .disable                = regulator_disable_regmap,
 292         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 293         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 294         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 295         .set_suspend_disable    = max77802_set_suspend_disable,
 296 };
 297
 298 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 299 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 300         .name           = "LDO"#num,                                    \
 301         .of_match       = of_match_ptr("LDO"#num),                      \
 302         .regulators_node        = of_match_ptr("regulators"),           \
 303         .id             = MAX77802_LDO##num,                            \
 304         .supply_name    = "inl"#supply,                                 \
 305         .ops            = &max77802_ldo_ops_logic##log,                 \
 306         .type           = REGULATOR_VOLTAGE,                            \
 307         .owner          = THIS_MODULE,                                  \
 308         .min_uV         = 800000,                                       \
 309         .uV_step        = 50000,                                        \
 310         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 311         .n_voltages     = 1 << 6,                                       \
 312         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 313         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 314         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 315         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 316         .of_map_mode    = max77802_map_mode,                            \
 317 }
 318
 319 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 320 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 321         .name           = "LDO"#num,                                    \
 322         .of_match       = of_match_ptr("LDO"#num),                      \
 323         .regulators_node        = of_match_ptr("regulators"),           \
 324         .id             = MAX77802_LDO##num,                            \
 325         .supply_name    = "inl"#supply,                                 \
 326         .ops            = &max77802_ldo_ops_logic##log,                 \
 327         .type           = REGULATOR_VOLTAGE,                            \
 328         .owner          = THIS_MODULE,                                  \
 329         .min_uV         = 800000,                                       \
 330         .uV_step        = 25000,                                        \
 331         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 332         .n_voltages     = 1 << 6,                                       \
 333         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 334         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 335         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 336         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 337         .of_map_mode    = max77802_map_mode,                            \
 338 }
 339
 340 /* BUCKs 1, 6 */
 341 #define regulator_77802_desc_16_buck(num)       {               \
 342         .name           = "BUCK"#num,                                   \
 343         .of_match       = of_match_ptr("BUCK"#num),                     \
 344         .regulators_node        = of_match_ptr("regulators"),           \
 345         .id             = MAX77802_BUCK##num,                           \
 346         .supply_name    = "inb"#num,                                    \
 347         .ops            = &max77802_buck_16_dvs_ops,                    \
 348         .type           = REGULATOR_VOLTAGE,                            \
 349         .owner          = THIS_MODULE,                                  \
 350         .min_uV         = 612500,                                       \
 351         .uV_step        = 6250,                                         \
 352         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 353         .n_voltages     = 1 << 8,                                       \
 354         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 355         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 356         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 357         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 358         .ramp_reg       = MAX77802_REG_BUCK ## num ## CTRL,             \
 359         .ramp_mask      = MAX77802_RAMP_RATE_MASK_4BIT,                 \
 360         .ramp_delay_table = max77802_buck16_ramp_table,                 \
 361         .n_ramp_values  = ARRAY_SIZE(max77802_buck16_ramp_table),       \
 362         .of_map_mode    = max77802_map_mode,                            \
 363 }
 364
 365 /* BUCKS 2-4 */
 366 #define regulator_77802_desc_234_buck(num)      {               \
 367         .name           = "BUCK"#num,                                   \
 368         .of_match       = of_match_ptr("BUCK"#num),                     \
 369         .regulators_node        = of_match_ptr("regulators"),           \
 370         .id             = MAX77802_BUCK##num,                           \
 371         .supply_name    = "inb"#num,                                    \
 372         .ops            = &max77802_buck_234_ops,                       \
 373         .type           = REGULATOR_VOLTAGE,                            \
 374         .owner          = THIS_MODULE,                                  \
 375         .min_uV         = 600000,                                       \
 376         .uV_step        = 6250,                                         \
 377         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 378         .n_voltages     = 0x91,                                         \
 379         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 380         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 381         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 382         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 383                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 384         .ramp_reg       = MAX77802_REG_BUCK ## num ## CTRL1,            \
 385         .ramp_mask      = MAX77802_RAMP_RATE_MASK_2BIT,                 \
 386         .ramp_delay_table = max77802_buck234_ramp_table,                \
 387         .n_ramp_values  = ARRAY_SIZE(max77802_buck234_ramp_table),      \
 388         .of_map_mode    = max77802_map_mode,                            \
 389 }
 390
 391 /* BUCK 5 */
 392 #define regulator_77802_desc_buck5(num)         {               \
 393         .name           = "BUCK"#num,                                   \
 394         .of_match       = of_match_ptr("BUCK"#num),                     \
 395         .regulators_node        = of_match_ptr("regulators"),           \
 396         .id             = MAX77802_BUCK##num,                           \
 397         .supply_name    = "inb"#num,                                    \
 398         .ops            = &max77802_buck_dvs_ops,                       \
 399         .type           = REGULATOR_VOLTAGE,                            \
 400         .owner          = THIS_MODULE,                                  \
 401         .min_uV         = 750000,                                       \
 402         .uV_step        = 50000,                                        \
 403         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 404         .n_voltages     = 1 << 6,                                       \
 405         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 406         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 407         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 408         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 409         .of_map_mode    = max77802_map_mode,                            \
 410 }
 411
 412 /* BUCKs 7-10 */
 413 #define regulator_77802_desc_buck7_10(num)      {               \
 414         .name           = "BUCK"#num,                                   \
 415         .of_match       = of_match_ptr("BUCK"#num),                     \
 416         .regulators_node        = of_match_ptr("regulators"),           \
 417         .id             = MAX77802_BUCK##num,                           \
 418         .supply_name    = "inb"#num,                                    \
 419         .ops            = &max77802_buck_dvs_ops,                       \
 420         .type           = REGULATOR_VOLTAGE,                            \
 421         .owner          = THIS_MODULE,                                  \
 422         .min_uV         = 750000,                                       \
 423         .uV_step        = 50000,                                        \
 424         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 425         .n_voltages     = 1 << 6,                                       \
 426         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 427         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 428         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 429         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 430         .of_map_mode    = max77802_map_mode,                            \
 431 }
 432
 433 static const struct regulator_desc regulators[] = {
 434         regulator_77802_desc_16_buck(1),
 435         regulator_77802_desc_234_buck(2),
 436         regulator_77802_desc_234_buck(3),
 437         regulator_77802_desc_234_buck(4),
 438         regulator_77802_desc_buck5(5),
 439         regulator_77802_desc_16_buck(6),
 440         regulator_77802_desc_buck7_10(7),
 441         regulator_77802_desc_buck7_10(8),
 442         regulator_77802_desc_buck7_10(9),
 443         regulator_77802_desc_buck7_10(10),
 444         regulator_77802_desc_n_ldo(1, 10, 2),
 445         regulator_77802_desc_n_ldo(2, 10, 1),
 446         regulator_77802_desc_p_ldo(3, 3, 2),
 447         regulator_77802_desc_p_ldo(4, 6, 1),
 448         regulator_77802_desc_p_ldo(5, 3, 1),
 449         regulator_77802_desc_p_ldo(6, 3, 1),
 450         regulator_77802_desc_p_ldo(7, 3, 1),
 451         regulator_77802_desc_n_ldo(8, 1, 1),
 452         regulator_77802_desc_p_ldo(9, 5, 1),
 453         regulator_77802_desc_p_ldo(10, 4, 1),
 454         regulator_77802_desc_p_ldo(11, 4, 1),
 455         regulator_77802_desc_p_ldo(12, 9, 1),
 456         regulator_77802_desc_p_ldo(13, 4, 1),
 457         regulator_77802_desc_p_ldo(14, 4, 1),
 458         regulator_77802_desc_n_ldo(15, 1, 1),
 459         regulator_77802_desc_n_ldo(17, 2, 1),
 460         regulator_77802_desc_p_ldo(18, 7, 1),
 461         regulator_77802_desc_p_ldo(19, 5, 1),
 462         regulator_77802_desc_p_ldo(20, 7, 2),
 463         regulator_77802_desc_p_ldo(21, 6, 2),
 464         regulator_77802_desc_p_ldo(23, 9, 1),
 465         regulator_77802_desc_p_ldo(24, 6, 1),
 466         regulator_77802_desc_p_ldo(25, 9, 1),
 467         regulator_77802_desc_p_ldo(26, 9, 1),
 468         regulator_77802_desc_n_ldo(27, 2, 1),
 469         regulator_77802_desc_p_ldo(28, 7, 1),
 470         regulator_77802_desc_p_ldo(29, 7, 1),
 471         regulator_77802_desc_n_ldo(30, 2, 1),
 472         regulator_77802_desc_p_ldo(32, 9, 1),
 473         regulator_77802_desc_p_ldo(33, 6, 1),
 474         regulator_77802_desc_p_ldo(34, 9, 1),
 475         regulator_77802_desc_n_ldo(35, 2, 1),
 476 };
 477
 478 static int max77802_pmic_probe(struct platform_device *pdev)
 479 {
 480         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 481         struct max77802_regulator_prv *max77802;
 482         int i, val;
 483         struct regulator_config config = { };
 484
 485         max77802 = devm_kzalloc(&pdev->dev,
 486                                 sizeof(struct max77802_regulator_prv),
 487                                 GFP_KERNEL);
 488         if (!max77802)
 489                 return -ENOMEM;
 490
 491         config.dev = iodev->dev;
 492         config.regmap = iodev->regmap;
 493         config.driver_data = max77802;
 494         platform_set_drvdata(pdev, max77802);
 495
 496         for (i = 0; i < MAX77802_REG_MAX; i++) {
 497                 struct regulator_dev *rdev;
 498                 int id = regulators[i].id;
 499                 int shift = max77802_get_opmode_shift(id);
 500                 int ret;
 501
 502                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 503                 if (ret < 0) {
 504                         dev_warn(&pdev->dev,
 505                                 "cannot read current mode for %d\n", i);
 506                         val = MAX77802_OPMODE_NORMAL;
 507                 } else {
 508                         val = val >> shift & MAX77802_OPMODE_MASK;
 509                 }
 510
 511                 /*
 512                  * If the regulator is disabled and the system warm rebooted,
 513                  * the hardware reports OFF as the regulator operating mode.
 514                  * Default to operating mode NORMAL in that case.
 515                  */
 516                 if (val == MAX77802_STATUS_OFF)
 517                         max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 518                 else
 519                         max77802->opmode[id] = val;
 520
 521                 rdev = devm_regulator_register(&pdev->dev,
 522                                                &regulators[i], &config);
 523                 if (IS_ERR(rdev)) {
 524                         ret = PTR_ERR(rdev);
 525                         dev_err(&pdev->dev,
 526                                 "regulator init failed for %d: %d\n", i, ret);
 527                         return ret;
 528                 }
 529         }
 530
 531         return 0;
 532 }
 533
 534 static const struct platform_device_id max77802_pmic_id[] = {
 535         {"max77802-pmic", 0},
 536         { },
 537 };
 538 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 539
 540 static struct platform_driver max77802_pmic_driver = {
 541         .driver = {
 542                 .name = "max77802-pmic",
 543         },
 544         .probe = max77802_pmic_probe,
 545         .id_table = max77802_pmic_id,
 546 };
 547
 548 module_platform_driver(max77802_pmic_driver);
 549
 550 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 551 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 552 MODULE_LICENSE("GPL");