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         unsigned int id = rdev_get_id(rdev);
  98         int shift = max77802_get_opmode_shift(id);
  99
 100         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 101                 return -EINVAL;
 102         max77802->opmode[id] = val;
 103         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 104                                   rdev->desc->enable_mask, val << shift);
 105 }
 106
 107 /*
 108  * Some LDOs support Low Power Mode while the system is running.
 109  *
 110  * LDOs 1, 3, 20, 21.
 111  */
 112 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
 113 {
 114         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 115         unsigned int id = rdev_get_id(rdev);
 116         unsigned int val;
 117         int shift = max77802_get_opmode_shift(id);
 118
 119         switch (mode) {
 120         case REGULATOR_MODE_STANDBY:
 121                 val = MAX77802_OPMODE_LP;       /* ON in Low Power Mode */
 122                 break;
 123         case REGULATOR_MODE_NORMAL:
 124                 val = MAX77802_OPMODE_NORMAL;   /* ON in Normal Mode */
 125                 break;
 126         default:
 127                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 128                          rdev->desc->name, mode);
 129                 return -EINVAL;
 130         }
 131
 132         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 133                 return -EINVAL;
 134
 135         max77802->opmode[id] = val;
 136         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 137                                   rdev->desc->enable_mask, val << shift);
 138 }
 139
 140 static unsigned max77802_get_mode(struct regulator_dev *rdev)
 141 {
 142         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 143         unsigned int id = rdev_get_id(rdev);
 144
 145         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 146                 return -EINVAL;
 147         return max77802_map_mode(max77802->opmode[id]);
 148 }
 149
 150 /**
 151  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
 152  * @rdev: regulator to change mode
 153  * @mode: operating mode to be set
 154  *
 155  * Will set the operating mode for the regulators during system suspend.
 156  * This function is valid for the three different enable control logics:
 157  *
 158  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
 159  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
 160  * Enable Control Logic3 by PWRREQ (LDO 3)
 161  *
 162  * If setting the regulator mode fails, the function only warns but does
 163  * not return an error code to avoid the regulator core to stop setting
 164  * the operating mode for the remaining regulators.
 165  */
 166 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 167                                      unsigned int mode)
 168 {
 169         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 170         unsigned int id = rdev_get_id(rdev);
 171         unsigned int val;
 172         int shift = max77802_get_opmode_shift(id);
 173
 174         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 175                 return -EINVAL;
 176
 177         /*
 178          * If the regulator has been disabled for suspend
 179          * then is invalid to try setting a suspend mode.
 180          */
 181         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
 182                 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 183                          rdev->desc->name, mode);
 184                 return 0;
 185         }
 186
 187         switch (mode) {
 188         case REGULATOR_MODE_STANDBY:
 189                 /*
 190                  * If the regulator opmode is normal then enable
 191                  * ON in Low Power Mode by PWRREQ. If the mode is
 192                  * already Low Power then no action is required.
 193                  */
 194                 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
 195                         val = MAX77802_LP_PWRREQ;
 196                 else
 197                         return 0;
 198                 break;
 199         case REGULATOR_MODE_NORMAL:
 200                 /*
 201                  * If the regulator operating mode is Low Power then
 202                  * normal is not a valid opmode in suspend. If the
 203                  * mode is already normal then no action is required.
 204                  */
 205                 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
 206                         dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
 207                                  rdev->desc->name, mode);
 208                 return 0;
 209         default:
 210                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 211                          rdev->desc->name, mode);
 212                 return -EINVAL;
 213         }
 214
 215         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 216                                   rdev->desc->enable_mask, val << shift);
 217 }
 218
 219 static int max77802_enable(struct regulator_dev *rdev)
 220 {
 221         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 222         unsigned int id = rdev_get_id(rdev);
 223         int shift = max77802_get_opmode_shift(id);
 224
 225         if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
 226                 return -EINVAL;
 227         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 228                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 229
 230         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 231                                   rdev->desc->enable_mask,
 232                                   max77802->opmode[id] << shift);
 233 }
 234
 235 /*
 236  * LDOs 2, 4-19, 22-35
 237  */
 238 static const struct regulator_ops max77802_ldo_ops_logic1 = {
 239         .list_voltage           = regulator_list_voltage_linear,
 240         .map_voltage            = regulator_map_voltage_linear,
 241         .is_enabled             = regulator_is_enabled_regmap,
 242         .enable                 = max77802_enable,
 243         .disable                = regulator_disable_regmap,
 244         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 245         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 246         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 247         .set_suspend_disable    = max77802_set_suspend_disable,
 248         .set_suspend_mode       = max77802_set_suspend_mode,
 249 };
 250
 251 /*
 252  * LDOs 1, 20, 21, 3
 253  */
 254 static const struct regulator_ops max77802_ldo_ops_logic2 = {
 255         .list_voltage           = regulator_list_voltage_linear,
 256         .map_voltage            = regulator_map_voltage_linear,
 257         .is_enabled             = regulator_is_enabled_regmap,
 258         .enable                 = max77802_enable,
 259         .disable                = regulator_disable_regmap,
 260         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 261         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 262         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 263         .set_mode               = max77802_set_mode,
 264         .get_mode               = max77802_get_mode,
 265         .set_suspend_mode       = max77802_set_suspend_mode,
 266 };
 267
 268 /* BUCKS 1, 6 */
 269 static const struct regulator_ops max77802_buck_16_dvs_ops = {
 270         .list_voltage           = regulator_list_voltage_linear,
 271         .map_voltage            = regulator_map_voltage_linear,
 272         .is_enabled             = regulator_is_enabled_regmap,
 273         .enable                 = max77802_enable,
 274         .disable                = regulator_disable_regmap,
 275         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 276         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 277         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 278         .set_ramp_delay         = regulator_set_ramp_delay_regmap,
 279         .set_suspend_disable    = max77802_set_suspend_disable,
 280 };
 281
 282 /* BUCKs 2-4 */
 283 static const struct regulator_ops max77802_buck_234_ops = {
 284         .list_voltage           = regulator_list_voltage_linear,
 285         .map_voltage            = regulator_map_voltage_linear,
 286         .is_enabled             = regulator_is_enabled_regmap,
 287         .enable                 = max77802_enable,
 288         .disable                = regulator_disable_regmap,
 289         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 290         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 291         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 292         .set_ramp_delay         = regulator_set_ramp_delay_regmap,
 293         .set_suspend_disable    = max77802_set_suspend_disable,
 294         .set_suspend_mode       = max77802_set_suspend_mode,
 295 };
 296
 297 /* BUCKs 5, 7-10 */
 298 static const struct regulator_ops max77802_buck_dvs_ops = {
 299         .list_voltage           = regulator_list_voltage_linear,
 300         .map_voltage            = regulator_map_voltage_linear,
 301         .is_enabled             = regulator_is_enabled_regmap,
 302         .enable                 = max77802_enable,
 303         .disable                = regulator_disable_regmap,
 304         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 305         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 306         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 307         .set_suspend_disable    = max77802_set_suspend_disable,
 308 };
 309
 310 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 311 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 312         .name           = "LDO"#num,                                    \
 313         .of_match       = of_match_ptr("LDO"#num),                      \
 314         .regulators_node        = of_match_ptr("regulators"),           \
 315         .id             = MAX77802_LDO##num,                            \
 316         .supply_name    = "inl"#supply,                                 \
 317         .ops            = &max77802_ldo_ops_logic##log,                 \
 318         .type           = REGULATOR_VOLTAGE,                            \
 319         .owner          = THIS_MODULE,                                  \
 320         .min_uV         = 800000,                                       \
 321         .uV_step        = 50000,                                        \
 322         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 323         .n_voltages     = 1 << 6,                                       \
 324         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 325         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 326         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 327         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 328         .of_map_mode    = max77802_map_mode,                            \
 329 }
 330
 331 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 332 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 333         .name           = "LDO"#num,                                    \
 334         .of_match       = of_match_ptr("LDO"#num),                      \
 335         .regulators_node        = of_match_ptr("regulators"),           \
 336         .id             = MAX77802_LDO##num,                            \
 337         .supply_name    = "inl"#supply,                                 \
 338         .ops            = &max77802_ldo_ops_logic##log,                 \
 339         .type           = REGULATOR_VOLTAGE,                            \
 340         .owner          = THIS_MODULE,                                  \
 341         .min_uV         = 800000,                                       \
 342         .uV_step        = 25000,                                        \
 343         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 344         .n_voltages     = 1 << 6,                                       \
 345         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 346         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 347         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 348         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 349         .of_map_mode    = max77802_map_mode,                            \
 350 }
 351
 352 /* BUCKs 1, 6 */
 353 #define regulator_77802_desc_16_buck(num)       {               \
 354         .name           = "BUCK"#num,                                   \
 355         .of_match       = of_match_ptr("BUCK"#num),                     \
 356         .regulators_node        = of_match_ptr("regulators"),           \
 357         .id             = MAX77802_BUCK##num,                           \
 358         .supply_name    = "inb"#num,                                    \
 359         .ops            = &max77802_buck_16_dvs_ops,                    \
 360         .type           = REGULATOR_VOLTAGE,                            \
 361         .owner          = THIS_MODULE,                                  \
 362         .min_uV         = 612500,                                       \
 363         .uV_step        = 6250,                                         \
 364         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 365         .n_voltages     = 1 << 8,                                       \
 366         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 367         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 368         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 369         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 370         .ramp_reg       = MAX77802_REG_BUCK ## num ## CTRL,             \
 371         .ramp_mask      = MAX77802_RAMP_RATE_MASK_4BIT,                 \
 372         .ramp_delay_table = max77802_buck16_ramp_table,                 \
 373         .n_ramp_values  = ARRAY_SIZE(max77802_buck16_ramp_table),       \
 374         .of_map_mode    = max77802_map_mode,                            \
 375 }
 376
 377 /* BUCKS 2-4 */
 378 #define regulator_77802_desc_234_buck(num)      {               \
 379         .name           = "BUCK"#num,                                   \
 380         .of_match       = of_match_ptr("BUCK"#num),                     \
 381         .regulators_node        = of_match_ptr("regulators"),           \
 382         .id             = MAX77802_BUCK##num,                           \
 383         .supply_name    = "inb"#num,                                    \
 384         .ops            = &max77802_buck_234_ops,                       \
 385         .type           = REGULATOR_VOLTAGE,                            \
 386         .owner          = THIS_MODULE,                                  \
 387         .min_uV         = 600000,                                       \
 388         .uV_step        = 6250,                                         \
 389         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 390         .n_voltages     = 0x91,                                         \
 391         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 392         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 393         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 394         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 395                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 396         .ramp_reg       = MAX77802_REG_BUCK ## num ## CTRL1,            \
 397         .ramp_mask      = MAX77802_RAMP_RATE_MASK_2BIT,                 \
 398         .ramp_delay_table = max77802_buck234_ramp_table,                \
 399         .n_ramp_values  = ARRAY_SIZE(max77802_buck234_ramp_table),      \
 400         .of_map_mode    = max77802_map_mode,                            \
 401 }
 402
 403 /* BUCK 5 */
 404 #define regulator_77802_desc_buck5(num)         {               \
 405         .name           = "BUCK"#num,                                   \
 406         .of_match       = of_match_ptr("BUCK"#num),                     \
 407         .regulators_node        = of_match_ptr("regulators"),           \
 408         .id             = MAX77802_BUCK##num,                           \
 409         .supply_name    = "inb"#num,                                    \
 410         .ops            = &max77802_buck_dvs_ops,                       \
 411         .type           = REGULATOR_VOLTAGE,                            \
 412         .owner          = THIS_MODULE,                                  \
 413         .min_uV         = 750000,                                       \
 414         .uV_step        = 50000,                                        \
 415         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 416         .n_voltages     = 1 << 6,                                       \
 417         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 418         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 419         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 420         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 421         .of_map_mode    = max77802_map_mode,                            \
 422 }
 423
 424 /* BUCKs 7-10 */
 425 #define regulator_77802_desc_buck7_10(num)      {               \
 426         .name           = "BUCK"#num,                                   \
 427         .of_match       = of_match_ptr("BUCK"#num),                     \
 428         .regulators_node        = of_match_ptr("regulators"),           \
 429         .id             = MAX77802_BUCK##num,                           \
 430         .supply_name    = "inb"#num,                                    \
 431         .ops            = &max77802_buck_dvs_ops,                       \
 432         .type           = REGULATOR_VOLTAGE,                            \
 433         .owner          = THIS_MODULE,                                  \
 434         .min_uV         = 750000,                                       \
 435         .uV_step        = 50000,                                        \
 436         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 437         .n_voltages     = 1 << 6,                                       \
 438         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 439         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 440         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 441         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 442         .of_map_mode    = max77802_map_mode,                            \
 443 }
 444
 445 static const struct regulator_desc regulators[] = {
 446         regulator_77802_desc_16_buck(1),
 447         regulator_77802_desc_234_buck(2),
 448         regulator_77802_desc_234_buck(3),
 449         regulator_77802_desc_234_buck(4),
 450         regulator_77802_desc_buck5(5),
 451         regulator_77802_desc_16_buck(6),
 452         regulator_77802_desc_buck7_10(7),
 453         regulator_77802_desc_buck7_10(8),
 454         regulator_77802_desc_buck7_10(9),
 455         regulator_77802_desc_buck7_10(10),
 456         regulator_77802_desc_n_ldo(1, 10, 2),
 457         regulator_77802_desc_n_ldo(2, 10, 1),
 458         regulator_77802_desc_p_ldo(3, 3, 2),
 459         regulator_77802_desc_p_ldo(4, 6, 1),
 460         regulator_77802_desc_p_ldo(5, 3, 1),
 461         regulator_77802_desc_p_ldo(6, 3, 1),
 462         regulator_77802_desc_p_ldo(7, 3, 1),
 463         regulator_77802_desc_n_ldo(8, 1, 1),
 464         regulator_77802_desc_p_ldo(9, 5, 1),
 465         regulator_77802_desc_p_ldo(10, 4, 1),
 466         regulator_77802_desc_p_ldo(11, 4, 1),
 467         regulator_77802_desc_p_ldo(12, 9, 1),
 468         regulator_77802_desc_p_ldo(13, 4, 1),
 469         regulator_77802_desc_p_ldo(14, 4, 1),
 470         regulator_77802_desc_n_ldo(15, 1, 1),
 471         regulator_77802_desc_n_ldo(17, 2, 1),
 472         regulator_77802_desc_p_ldo(18, 7, 1),
 473         regulator_77802_desc_p_ldo(19, 5, 1),
 474         regulator_77802_desc_p_ldo(20, 7, 2),
 475         regulator_77802_desc_p_ldo(21, 6, 2),
 476         regulator_77802_desc_p_ldo(23, 9, 1),
 477         regulator_77802_desc_p_ldo(24, 6, 1),
 478         regulator_77802_desc_p_ldo(25, 9, 1),
 479         regulator_77802_desc_p_ldo(26, 9, 1),
 480         regulator_77802_desc_n_ldo(27, 2, 1),
 481         regulator_77802_desc_p_ldo(28, 7, 1),
 482         regulator_77802_desc_p_ldo(29, 7, 1),
 483         regulator_77802_desc_n_ldo(30, 2, 1),
 484         regulator_77802_desc_p_ldo(32, 9, 1),
 485         regulator_77802_desc_p_ldo(33, 6, 1),
 486         regulator_77802_desc_p_ldo(34, 9, 1),
 487         regulator_77802_desc_n_ldo(35, 2, 1),
 488 };
 489
 490 static int max77802_pmic_probe(struct platform_device *pdev)
 491 {
 492         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 493         struct max77802_regulator_prv *max77802;
 494         int i, val;
 495         struct regulator_config config = { };
 496
 497         max77802 = devm_kzalloc(&pdev->dev,
 498                                 sizeof(struct max77802_regulator_prv),
 499                                 GFP_KERNEL);
 500         if (!max77802)
 501                 return -ENOMEM;
 502
 503         config.dev = iodev->dev;
 504         config.regmap = iodev->regmap;
 505         config.driver_data = max77802;
 506         platform_set_drvdata(pdev, max77802);
 507
 508         for (i = 0; i < MAX77802_REG_MAX; i++) {
 509                 struct regulator_dev *rdev;
 510                 unsigned int id = regulators[i].id;
 511                 int shift = max77802_get_opmode_shift(id);
 512                 int ret;
 513
 514                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 515                 if (ret < 0) {
 516                         dev_warn(&pdev->dev,
 517                                 "cannot read current mode for %d\n", i);
 518                         val = MAX77802_OPMODE_NORMAL;
 519                 } else {
 520                         val = val >> shift & MAX77802_OPMODE_MASK;
 521                 }
 522
 523                 /*
 524                  * If the regulator is disabled and the system warm rebooted,
 525                  * the hardware reports OFF as the regulator operating mode.
 526                  * Default to operating mode NORMAL in that case.
 527                  */
 528                 if (id < ARRAY_SIZE(max77802->opmode)) {
 529                         if (val == MAX77802_STATUS_OFF)
 530                                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 531                         else
 532                                 max77802->opmode[id] = val;
 533                 }
 534
 535                 rdev = devm_regulator_register(&pdev->dev,
 536                                                &regulators[i], &config);
 537                 if (IS_ERR(rdev)) {
 538                         ret = PTR_ERR(rdev);
 539                         dev_err(&pdev->dev,
 540                                 "regulator init failed for %d: %d\n", i, ret);
 541                         return ret;
 542                 }
 543         }
 544
 545         return 0;
 546 }
 547
 548 static const struct platform_device_id max77802_pmic_id[] = {
 549         {"max77802-pmic", 0},
 550         { },
 551 };
 552 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 553
 554 static struct platform_driver max77802_pmic_driver = {
 555         .driver = {
 556                 .name = "max77802-pmic",
 557                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 558         },
 559         .probe = max77802_pmic_probe,
 560         .id_table = max77802_pmic_id,
 561 };
 562
 563 module_platform_driver(max77802_pmic_driver);
 564
 565 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 566 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 567 MODULE_LICENSE("GPL");