drivers/regulator/hi6421-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Device driver for regulators in Hi6421 IC
   4 //
   5 // Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
   6 //              http://www.hisilicon.com
   7 // Copyright (c) <2013-2014> Linaro Ltd.
   8 //              https://www.linaro.org
   9 //
  10 // Author: Guodong Xu <guodong.xu@linaro.org>
  11
  12 #include <linux/slab.h>
  13 #include <linux/device.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/of.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/of_regulator.h>
  22 #include <linux/mfd/hi6421-pmic.h>
  23
  24 /*
  25  * struct hi6421_regulator_pdata - Hi6421 regulator data of platform device
  26  * @lock: mutex to serialize regulator enable
  27  */
  28 struct hi6421_regulator_pdata {
  29         struct mutex lock;
  30 };
  31
  32 /*
  33  * struct hi6421_regulator_info - hi6421 regulator information
  34  * @desc: regulator description
  35  * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
  36  * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
  37  */
  38 struct hi6421_regulator_info {
  39         struct regulator_desc   desc;
  40         u8              mode_mask;
  41         u32             eco_microamp;
  42 };
  43
  44 /* HI6421 regulators */
  45 enum hi6421_regulator_id {
  46         HI6421_LDO0,
  47         HI6421_LDO1,
  48         HI6421_LDO2,
  49         HI6421_LDO3,
  50         HI6421_LDO4,
  51         HI6421_LDO5,
  52         HI6421_LDO6,
  53         HI6421_LDO7,
  54         HI6421_LDO8,
  55         HI6421_LDO9,
  56         HI6421_LDO10,
  57         HI6421_LDO11,
  58         HI6421_LDO12,
  59         HI6421_LDO13,
  60         HI6421_LDO14,
  61         HI6421_LDO15,
  62         HI6421_LDO16,
  63         HI6421_LDO17,
  64         HI6421_LDO18,
  65         HI6421_LDO19,
  66         HI6421_LDO20,
  67         HI6421_LDOAUDIO,
  68         HI6421_BUCK0,
  69         HI6421_BUCK1,
  70         HI6421_BUCK2,
  71         HI6421_BUCK3,
  72         HI6421_BUCK4,
  73         HI6421_BUCK5,
  74         HI6421_NUM_REGULATORS,
  75 };
  76
  77 /* LDO 0, 4~7, 9~14, 16~20 have same voltage table. */
  78 static const unsigned int ldo_0_voltages[] = {
  79         1500000, 1800000, 2400000, 2500000,
  80         2600000, 2700000, 2850000, 3000000,
  81 };
  82
  83 /* LDO 8, 15 have same voltage table. */
  84 static const unsigned int ldo_8_voltages[] = {
  85         1500000, 1800000, 2400000, 2600000,
  86         2700000, 2850000, 3000000, 3300000,
  87 };
  88
  89 /* Ranges are sorted in ascending order. */
  90 static const struct linear_range ldo_audio_volt_range[] = {
  91         REGULATOR_LINEAR_RANGE(2800000, 0, 3, 50000),
  92         REGULATOR_LINEAR_RANGE(3000000, 4, 7, 100000),
  93 };
  94
  95 static const unsigned int buck_3_voltages[] = {
  96          950000, 1050000, 1100000, 1117000,
  97         1134000, 1150000, 1167000, 1200000,
  98 };
  99
 100 static const unsigned int buck_4_voltages[] = {
 101         1150000, 1200000, 1250000, 1350000,
 102         1700000, 1800000, 1900000, 2000000,
 103 };
 104
 105 static const unsigned int buck_5_voltages[] = {
 106         1150000, 1200000, 1250000, 1350000,
 107         1600000, 1700000, 1800000, 1900000,
 108 };
 109
 110 static const struct regulator_ops hi6421_ldo_ops;
 111 static const struct regulator_ops hi6421_ldo_linear_ops;
 112 static const struct regulator_ops hi6421_ldo_linear_range_ops;
 113 static const struct regulator_ops hi6421_buck012_ops;
 114 static const struct regulator_ops hi6421_buck345_ops;
 115
 116 #define HI6421_LDO_ENABLE_TIME (350)
 117 /*
 118  * _id - LDO id name string
 119  * _match - of match name string
 120  * v_table - voltage table
 121  * vreg - voltage select register
 122  * vmask - voltage select mask
 123  * ereg - enable register
 124  * emask - enable mask
 125  * odelay - off/on delay time in uS
 126  * ecomask - eco mode mask
 127  * ecoamp - eco mode load uppler limit in uA
 128  */
 129 #define HI6421_LDO(_id, _match, v_table, vreg, vmask, ereg, emask,      \
 130                    odelay, ecomask, ecoamp)                             \
 131         [HI6421_##_id] = {                                              \
 132                 .desc = {                                               \
 133                         .name           = #_id,                         \
 134                         .of_match        = #_match,                     \
 135                         .regulators_node = "regulators",                \
 136                         .ops            = &hi6421_ldo_ops,              \
 137                         .type           = REGULATOR_VOLTAGE,            \
 138                         .id             = HI6421_##_id,                 \
 139                         .owner          = THIS_MODULE,                  \
 140                         .n_voltages     = ARRAY_SIZE(v_table),          \
 141                         .volt_table     = v_table,                      \
 142                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 143                         .vsel_mask      = vmask,                        \
 144                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 145                         .enable_mask    = emask,                        \
 146                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 147                         .off_on_delay   = odelay,                       \
 148                 },                                                      \
 149                 .mode_mask              = ecomask,                      \
 150                 .eco_microamp           = ecoamp,                       \
 151         }
 152
 153 /* HI6421 LDO1~3 are linear voltage regulators at fixed uV_step
 154  *
 155  * _id - LDO id name string
 156  * _match - of match name string
 157  * _min_uV - minimum voltage supported in uV
 158  * n_volt - number of votages available
 159  * vstep - voltage increase in each linear step in uV
 160  * vreg - voltage select register
 161  * vmask - voltage select mask
 162  * ereg - enable register
 163  * emask - enable mask
 164  * odelay - off/on delay time in uS
 165  * ecomask - eco mode mask
 166  * ecoamp - eco mode load uppler limit in uA
 167  */
 168 #define HI6421_LDO_LINEAR(_id, _match, _min_uV, n_volt, vstep, vreg, vmask,\
 169                           ereg, emask, odelay, ecomask, ecoamp)         \
 170         [HI6421_##_id] = {                                              \
 171                 .desc = {                                               \
 172                         .name           = #_id,                         \
 173                         .of_match        = #_match,                     \
 174                         .regulators_node = "regulators",                \
 175                         .ops            = &hi6421_ldo_linear_ops,       \
 176                         .type           = REGULATOR_VOLTAGE,            \
 177                         .id             = HI6421_##_id,                 \
 178                         .owner          = THIS_MODULE,                  \
 179                         .min_uV         = _min_uV,                      \
 180                         .n_voltages     = n_volt,                       \
 181                         .uV_step        = vstep,                        \
 182                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 183                         .vsel_mask      = vmask,                        \
 184                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 185                         .enable_mask    = emask,                        \
 186                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 187                         .off_on_delay   = odelay,                       \
 188                 },                                                      \
 189                 .mode_mask              = ecomask,                      \
 190                 .eco_microamp           = ecoamp,                       \
 191         }
 192
 193 /* HI6421 LDOAUDIO is a linear voltage regulator with two 4-step ranges
 194  *
 195  * _id - LDO id name string
 196  * _match - of match name string
 197  * n_volt - number of votages available
 198  * volt_ranges - array of linear_range
 199  * vstep - voltage increase in each linear step in uV
 200  * vreg - voltage select register
 201  * vmask - voltage select mask
 202  * ereg - enable register
 203  * emask - enable mask
 204  * odelay - off/on delay time in uS
 205  * ecomask - eco mode mask
 206  * ecoamp - eco mode load uppler limit in uA
 207  */
 208 #define HI6421_LDO_LINEAR_RANGE(_id, _match, n_volt, volt_ranges, vreg, vmask,\
 209                                 ereg, emask, odelay, ecomask, ecoamp)   \
 210         [HI6421_##_id] = {                                              \
 211                 .desc = {                                               \
 212                         .name           = #_id,                         \
 213                         .of_match        = #_match,                     \
 214                         .regulators_node = "regulators",                \
 215                         .ops            = &hi6421_ldo_linear_range_ops, \
 216                         .type           = REGULATOR_VOLTAGE,            \
 217                         .id             = HI6421_##_id,                 \
 218                         .owner          = THIS_MODULE,                  \
 219                         .n_voltages     = n_volt,                       \
 220                         .linear_ranges  = volt_ranges,                  \
 221                         .n_linear_ranges = ARRAY_SIZE(volt_ranges),     \
 222                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 223                         .vsel_mask      = vmask,                        \
 224                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 225                         .enable_mask    = emask,                        \
 226                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 227                         .off_on_delay   = odelay,                       \
 228                 },                                                      \
 229                 .mode_mask              = ecomask,                      \
 230                 .eco_microamp           = ecoamp,                       \
 231         }
 232
 233 /* HI6421 BUCK0/1/2 are linear voltage regulators at fixed uV_step
 234  *
 235  * _id - BUCK0/1/2 id name string
 236  * _match - of match name string
 237  * vreg - voltage select register
 238  * vmask - voltage select mask
 239  * ereg - enable register
 240  * emask - enable mask
 241  * sleepmask - mask of sleep mode
 242  * etime - enable time
 243  * odelay - off/on delay time in uS
 244  */
 245 #define HI6421_BUCK012(_id, _match, vreg, vmask, ereg, emask, sleepmask,\
 246                         etime, odelay)                                  \
 247         [HI6421_##_id] = {                                              \
 248                 .desc = {                                               \
 249                         .name           = #_id,                         \
 250                         .of_match        = #_match,                     \
 251                         .regulators_node = "regulators",                \
 252                         .ops            = &hi6421_buck012_ops,          \
 253                         .type           = REGULATOR_VOLTAGE,            \
 254                         .id             = HI6421_##_id,                 \
 255                         .owner          = THIS_MODULE,                  \
 256                         .min_uV         = 700000,                       \
 257                         .n_voltages     = 128,                          \
 258                         .uV_step        = 7086,                         \
 259                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 260                         .vsel_mask      = vmask,                        \
 261                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 262                         .enable_mask    = emask,                        \
 263                         .enable_time    = etime,                        \
 264                         .off_on_delay   = odelay,                       \
 265                 },                                                      \
 266                 .mode_mask              = sleepmask,                    \
 267         }
 268
 269 /* HI6421 BUCK3/4/5 share similar configurations as LDOs, with exception
 270  *  that it supports SLEEP mode, so has different .ops.
 271  *
 272  * _id - LDO id name string
 273  * _match - of match name string
 274  * v_table - voltage table
 275  * vreg - voltage select register
 276  * vmask - voltage select mask
 277  * ereg - enable register
 278  * emask - enable mask
 279  * odelay - off/on delay time in uS
 280  * sleepmask - mask of sleep mode
 281  */
 282 #define HI6421_BUCK345(_id, _match, v_table, vreg, vmask, ereg, emask,  \
 283                         odelay, sleepmask)                              \
 284         [HI6421_##_id] = {                                              \
 285                 .desc = {                                               \
 286                         .name           = #_id,                         \
 287                         .of_match        = #_match,                     \
 288                         .regulators_node = "regulators",                \
 289                         .ops            = &hi6421_buck345_ops,          \
 290                         .type           = REGULATOR_VOLTAGE,            \
 291                         .id             = HI6421_##_id,                 \
 292                         .owner          = THIS_MODULE,                  \
 293                         .n_voltages     = ARRAY_SIZE(v_table),          \
 294                         .volt_table     = v_table,                      \
 295                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 296                         .vsel_mask      = vmask,                        \
 297                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 298                         .enable_mask    = emask,                        \
 299                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 300                         .off_on_delay   = odelay,                       \
 301                 },                                                      \
 302                 .mode_mask              = sleepmask,                    \
 303         }
 304
 305 /* HI6421 regulator information */
 306 static struct hi6421_regulator_info
 307                 hi6421_regulator_info[HI6421_NUM_REGULATORS] = {
 308         HI6421_LDO(LDO0, hi6421_vout0, ldo_0_voltages, 0x20, 0x07, 0x20, 0x10,
 309                    10000, 0x20, 8000),
 310         HI6421_LDO_LINEAR(LDO1, hi6421_vout1, 1700000, 4, 100000, 0x21, 0x03,
 311                           0x21, 0x10, 10000, 0x20, 5000),
 312         HI6421_LDO_LINEAR(LDO2, hi6421_vout2, 1050000, 8, 50000, 0x22, 0x07,
 313                           0x22, 0x10, 20000, 0x20, 8000),
 314         HI6421_LDO_LINEAR(LDO3, hi6421_vout3, 1050000, 8, 50000, 0x23, 0x07,
 315                           0x23, 0x10, 20000, 0x20, 8000),
 316         HI6421_LDO(LDO4, hi6421_vout4, ldo_0_voltages, 0x24, 0x07, 0x24, 0x10,
 317                    20000, 0x20, 8000),
 318         HI6421_LDO(LDO5, hi6421_vout5, ldo_0_voltages, 0x25, 0x07, 0x25, 0x10,
 319                    20000, 0x20, 8000),
 320         HI6421_LDO(LDO6, hi6421_vout6, ldo_0_voltages, 0x26, 0x07, 0x26, 0x10,
 321                    20000, 0x20, 8000),
 322         HI6421_LDO(LDO7, hi6421_vout7, ldo_0_voltages, 0x27, 0x07, 0x27, 0x10,
 323                    20000, 0x20, 5000),
 324         HI6421_LDO(LDO8, hi6421_vout8, ldo_8_voltages, 0x28, 0x07, 0x28, 0x10,
 325                    20000, 0x20, 8000),
 326         HI6421_LDO(LDO9, hi6421_vout9, ldo_0_voltages, 0x29, 0x07, 0x29, 0x10,
 327                    40000, 0x20, 8000),
 328         HI6421_LDO(LDO10, hi6421_vout10, ldo_0_voltages, 0x2a, 0x07, 0x2a, 0x10,
 329                    40000, 0x20, 8000),
 330         HI6421_LDO(LDO11, hi6421_vout11, ldo_0_voltages, 0x2b, 0x07, 0x2b, 0x10,
 331                    40000, 0x20, 8000),
 332         HI6421_LDO(LDO12, hi6421_vout12, ldo_0_voltages, 0x2c, 0x07, 0x2c, 0x10,
 333                    40000, 0x20, 8000),
 334         HI6421_LDO(LDO13, hi6421_vout13, ldo_0_voltages, 0x2d, 0x07, 0x2d, 0x10,
 335                    40000, 0x20, 8000),
 336         HI6421_LDO(LDO14, hi6421_vout14, ldo_0_voltages, 0x2e, 0x07, 0x2e, 0x10,
 337                    40000, 0x20, 8000),
 338         HI6421_LDO(LDO15, hi6421_vout15, ldo_8_voltages, 0x2f, 0x07, 0x2f, 0x10,
 339                    40000, 0x20, 8000),
 340         HI6421_LDO(LDO16, hi6421_vout16, ldo_0_voltages, 0x30, 0x07, 0x30, 0x10,
 341                    40000, 0x20, 8000),
 342         HI6421_LDO(LDO17, hi6421_vout17, ldo_0_voltages, 0x31, 0x07, 0x31, 0x10,
 343                    40000, 0x20, 8000),
 344         HI6421_LDO(LDO18, hi6421_vout18, ldo_0_voltages, 0x32, 0x07, 0x32, 0x10,
 345                    40000, 0x20, 8000),
 346         HI6421_LDO(LDO19, hi6421_vout19, ldo_0_voltages, 0x33, 0x07, 0x33, 0x10,
 347                    40000, 0x20, 8000),
 348         HI6421_LDO(LDO20, hi6421_vout20, ldo_0_voltages, 0x34, 0x07, 0x34, 0x10,
 349                    40000, 0x20, 8000),
 350         HI6421_LDO_LINEAR_RANGE(LDOAUDIO, hi6421_vout_audio, 8,
 351                                 ldo_audio_volt_range, 0x36, 0x70, 0x36, 0x01,
 352                                 40000, 0x02, 5000),
 353         HI6421_BUCK012(BUCK0, hi6421_buck0, 0x0d, 0x7f, 0x0c, 0x01, 0x10, 400,
 354                        20000),
 355         HI6421_BUCK012(BUCK1, hi6421_buck1, 0x0f, 0x7f, 0x0e, 0x01, 0x10, 400,
 356                        20000),
 357         HI6421_BUCK012(BUCK2, hi6421_buck2, 0x11, 0x7f, 0x10, 0x01, 0x10, 350,
 358                        100),
 359         HI6421_BUCK345(BUCK3, hi6421_buck3, buck_3_voltages, 0x13, 0x07, 0x12,
 360                        0x01, 20000, 0x10),
 361         HI6421_BUCK345(BUCK4, hi6421_buck4, buck_4_voltages, 0x15, 0x07, 0x14,
 362                        0x01, 20000, 0x10),
 363         HI6421_BUCK345(BUCK5, hi6421_buck5, buck_5_voltages, 0x17, 0x07, 0x16,
 364                        0x01, 20000, 0x10),
 365 };
 366
 367 static int hi6421_regulator_enable(struct regulator_dev *rdev)
 368 {
 369         struct hi6421_regulator_pdata *pdata = rdev_get_drvdata(rdev);
 370
 371         /* hi6421 spec requires regulator enablement must be serialized:
 372          *  - Because when BUCK, LDO switching from off to on, it will have
 373          *    a huge instantaneous current; so you can not turn on two or
 374          *    more LDO or BUCKs simultaneously, or it may burn the chip.
 375          */
 376         mutex_lock(&pdata->lock);
 377
 378         /* call regulator regmap helper */
 379         regulator_enable_regmap(rdev);
 380
 381         mutex_unlock(&pdata->lock);
 382         return 0;
 383 }
 384
 385 static unsigned int hi6421_regulator_ldo_get_mode(struct regulator_dev *rdev)
 386 {
 387         struct hi6421_regulator_info *info;
 388         unsigned int reg_val;
 389
 390         info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
 391         regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 392         if (reg_val & info->mode_mask)
 393                 return REGULATOR_MODE_IDLE;
 394
 395         return REGULATOR_MODE_NORMAL;
 396 }
 397
 398 static unsigned int hi6421_regulator_buck_get_mode(struct regulator_dev *rdev)
 399 {
 400         struct hi6421_regulator_info *info;
 401         unsigned int reg_val;
 402
 403         info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
 404         regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 405         if (reg_val & info->mode_mask)
 406                 return REGULATOR_MODE_STANDBY;
 407
 408         return REGULATOR_MODE_NORMAL;
 409 }
 410
 411 static int hi6421_regulator_ldo_set_mode(struct regulator_dev *rdev,
 412                                                 unsigned int mode)
 413 {
 414         struct hi6421_regulator_info *info;
 415         unsigned int new_mode;
 416
 417         info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
 418         switch (mode) {
 419         case REGULATOR_MODE_NORMAL:
 420                 new_mode = 0;
 421                 break;
 422         case REGULATOR_MODE_IDLE:
 423                 new_mode = info->mode_mask;
 424                 break;
 425         default:
 426                 return -EINVAL;
 427         }
 428
 429         /* set mode */
 430         regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 431                            info->mode_mask, new_mode);
 432
 433         return 0;
 434 }
 435
 436 static int hi6421_regulator_buck_set_mode(struct regulator_dev *rdev,
 437                                                 unsigned int mode)
 438 {
 439         struct hi6421_regulator_info *info;
 440         unsigned int new_mode;
 441
 442         info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
 443         switch (mode) {
 444         case REGULATOR_MODE_NORMAL:
 445                 new_mode = 0;
 446                 break;
 447         case REGULATOR_MODE_STANDBY:
 448                 new_mode = info->mode_mask;
 449                 break;
 450         default:
 451                 return -EINVAL;
 452         }
 453
 454         /* set mode */
 455         regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 456                            info->mode_mask, new_mode);
 457
 458         return 0;
 459 }
 460
 461 static unsigned int
 462 hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
 463                         int input_uV, int output_uV, int load_uA)
 464 {
 465         struct hi6421_regulator_info *info;
 466
 467         info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
 468
 469         if (load_uA > info->eco_microamp)
 470                 return REGULATOR_MODE_NORMAL;
 471
 472         return REGULATOR_MODE_IDLE;
 473 }
 474
 475 static const struct regulator_ops hi6421_ldo_ops = {
 476         .is_enabled = regulator_is_enabled_regmap,
 477         .enable = hi6421_regulator_enable,
 478         .disable = regulator_disable_regmap,
 479         .list_voltage = regulator_list_voltage_table,
 480         .map_voltage = regulator_map_voltage_ascend,
 481         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 482         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 483         .get_mode = hi6421_regulator_ldo_get_mode,
 484         .set_mode = hi6421_regulator_ldo_set_mode,
 485         .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
 486 };
 487
 488 static const struct regulator_ops hi6421_ldo_linear_ops = {
 489         .is_enabled = regulator_is_enabled_regmap,
 490         .enable = hi6421_regulator_enable,
 491         .disable = regulator_disable_regmap,
 492         .list_voltage = regulator_list_voltage_linear,
 493         .map_voltage = regulator_map_voltage_linear,
 494         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 495         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 496         .get_mode = hi6421_regulator_ldo_get_mode,
 497         .set_mode = hi6421_regulator_ldo_set_mode,
 498         .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
 499 };
 500
 501 static const struct regulator_ops hi6421_ldo_linear_range_ops = {
 502         .is_enabled = regulator_is_enabled_regmap,
 503         .enable = hi6421_regulator_enable,
 504         .disable = regulator_disable_regmap,
 505         .list_voltage = regulator_list_voltage_linear_range,
 506         .map_voltage = regulator_map_voltage_linear_range,
 507         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 508         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 509         .get_mode = hi6421_regulator_ldo_get_mode,
 510         .set_mode = hi6421_regulator_ldo_set_mode,
 511         .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
 512 };
 513
 514 static const struct regulator_ops hi6421_buck012_ops = {
 515         .is_enabled = regulator_is_enabled_regmap,
 516         .enable = hi6421_regulator_enable,
 517         .disable = regulator_disable_regmap,
 518         .list_voltage = regulator_list_voltage_linear,
 519         .map_voltage = regulator_map_voltage_linear,
 520         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 521         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 522         .get_mode = hi6421_regulator_buck_get_mode,
 523         .set_mode = hi6421_regulator_buck_set_mode,
 524 };
 525
 526 static const struct regulator_ops hi6421_buck345_ops = {
 527         .is_enabled = regulator_is_enabled_regmap,
 528         .enable = hi6421_regulator_enable,
 529         .disable = regulator_disable_regmap,
 530         .list_voltage = regulator_list_voltage_table,
 531         .map_voltage = regulator_map_voltage_ascend,
 532         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 533         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 534         .get_mode = hi6421_regulator_buck_get_mode,
 535         .set_mode = hi6421_regulator_buck_set_mode,
 536 };
 537
 538 static int hi6421_regulator_probe(struct platform_device *pdev)
 539 {
 540         struct hi6421_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
 541         struct hi6421_regulator_pdata *pdata;
 542         struct hi6421_regulator_info *info;
 543         struct regulator_config config = { };
 544         struct regulator_dev *rdev;
 545         int i;
 546
 547         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 548         if (!pdata)
 549                 return -ENOMEM;
 550         mutex_init(&pdata->lock);
 551
 552         for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
 553                 /* assign per-regulator data */
 554                 info = &hi6421_regulator_info[i];
 555
 556                 config.dev = pdev->dev.parent;
 557                 config.driver_data = pdata;
 558                 config.regmap = pmic->regmap;
 559
 560                 rdev = devm_regulator_register(&pdev->dev, &info->desc,
 561                                                &config);
 562                 if (IS_ERR(rdev)) {
 563                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 564                                 info->desc.name);
 565                         return PTR_ERR(rdev);
 566                 }
 567         }
 568
 569         return 0;
 570 }
 571
 572 static const struct platform_device_id hi6421_regulator_table[] = {
 573         { .name = "hi6421-regulator" },
 574         {},
 575 };
 576 MODULE_DEVICE_TABLE(platform, hi6421_regulator_table);
 577
 578 static struct platform_driver hi6421_regulator_driver = {
 579         .id_table = hi6421_regulator_table,
 580         .driver = {
 581                 .name   = "hi6421-regulator",
 582                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 583         },
 584         .probe  = hi6421_regulator_probe,
 585 };
 586 module_platform_driver(hi6421_regulator_driver);
 587
 588 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
 589 MODULE_DESCRIPTION("Hi6421 regulator driver");
 590 MODULE_LICENSE("GPL v2");