kernel/drivers/regulator/hi6421-regulator.c

   1 /*
   2  * Device driver for regulators in Hi6421 IC
   3  *
   4  * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
   5  *              http://www.hisilicon.com
   6  * Copyright (c) <2013-2014> Linaro Ltd.
   7  *              http://www.linaro.org
   8  *
   9  * Author: Guodong Xu <guodong.xu@linaro.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/slab.h>
  17 #include <linux/device.h>
  18 #include <linux/module.h>
  19 #include <linux/err.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/of.h>
  22 #include <linux/regmap.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/regulator/of_regulator.h>
  26 #include <linux/mfd/hi6421-pmic.h>
  27
  28 /*
  29  * struct hi6421_regulator_pdata - Hi6421 regulator data of platform device
  30  * @lock: mutex to serialize regulator enable
  31  */
  32 struct hi6421_regulator_pdata {
  33         struct mutex lock;
  34 };
  35
  36 /*
  37  * struct hi6421_regulator_info - hi6421 regulator information
  38  * @desc: regulator description
  39  * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
  40  * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
  41  */
  42 struct hi6421_regulator_info {
  43         struct regulator_desc   desc;
  44         u8              mode_mask;
  45         u32             eco_microamp;
  46 };
  47
  48 /* HI6421 regulators */
  49 enum hi6421_regulator_id {
  50         HI6421_LDO0,
  51         HI6421_LDO1,
  52         HI6421_LDO2,
  53         HI6421_LDO3,
  54         HI6421_LDO4,
  55         HI6421_LDO5,
  56         HI6421_LDO6,
  57         HI6421_LDO7,
  58         HI6421_LDO8,
  59         HI6421_LDO9,
  60         HI6421_LDO10,
  61         HI6421_LDO11,
  62         HI6421_LDO12,
  63         HI6421_LDO13,
  64         HI6421_LDO14,
  65         HI6421_LDO15,
  66         HI6421_LDO16,
  67         HI6421_LDO17,
  68         HI6421_LDO18,
  69         HI6421_LDO19,
  70         HI6421_LDO20,
  71         HI6421_LDOAUDIO,
  72         HI6421_BUCK0,
  73         HI6421_BUCK1,
  74         HI6421_BUCK2,
  75         HI6421_BUCK3,
  76         HI6421_BUCK4,
  77         HI6421_BUCK5,
  78         HI6421_NUM_REGULATORS,
  79 };
  80
  81 #define HI6421_REGULATOR_OF_MATCH(_name, id)                            \
  82 {                                                                       \
  83         .name = #_name,                                                 \
  84         .driver_data = (void *) HI6421_##id,                            \
  85 }
  86
  87 static struct of_regulator_match hi6421_regulator_match[] = {
  88         HI6421_REGULATOR_OF_MATCH(hi6421_vout0, LDO0),
  89         HI6421_REGULATOR_OF_MATCH(hi6421_vout1, LDO1),
  90         HI6421_REGULATOR_OF_MATCH(hi6421_vout2, LDO2),
  91         HI6421_REGULATOR_OF_MATCH(hi6421_vout3, LDO3),
  92         HI6421_REGULATOR_OF_MATCH(hi6421_vout4, LDO4),
  93         HI6421_REGULATOR_OF_MATCH(hi6421_vout5, LDO5),
  94         HI6421_REGULATOR_OF_MATCH(hi6421_vout6, LDO6),
  95         HI6421_REGULATOR_OF_MATCH(hi6421_vout7, LDO7),
  96         HI6421_REGULATOR_OF_MATCH(hi6421_vout8, LDO8),
  97         HI6421_REGULATOR_OF_MATCH(hi6421_vout9, LDO9),
  98         HI6421_REGULATOR_OF_MATCH(hi6421_vout10, LDO10),
  99         HI6421_REGULATOR_OF_MATCH(hi6421_vout11, LDO11),
 100         HI6421_REGULATOR_OF_MATCH(hi6421_vout12, LDO12),
 101         HI6421_REGULATOR_OF_MATCH(hi6421_vout13, LDO13),
 102         HI6421_REGULATOR_OF_MATCH(hi6421_vout14, LDO14),
 103         HI6421_REGULATOR_OF_MATCH(hi6421_vout15, LDO15),
 104         HI6421_REGULATOR_OF_MATCH(hi6421_vout16, LDO16),
 105         HI6421_REGULATOR_OF_MATCH(hi6421_vout17, LDO17),
 106         HI6421_REGULATOR_OF_MATCH(hi6421_vout18, LDO18),
 107         HI6421_REGULATOR_OF_MATCH(hi6421_vout19, LDO19),
 108         HI6421_REGULATOR_OF_MATCH(hi6421_vout20, LDO20),
 109         HI6421_REGULATOR_OF_MATCH(hi6421_vout_audio, LDOAUDIO),
 110         HI6421_REGULATOR_OF_MATCH(hi6421_buck0, BUCK0),
 111         HI6421_REGULATOR_OF_MATCH(hi6421_buck1, BUCK1),
 112         HI6421_REGULATOR_OF_MATCH(hi6421_buck2, BUCK2),
 113         HI6421_REGULATOR_OF_MATCH(hi6421_buck3, BUCK3),
 114         HI6421_REGULATOR_OF_MATCH(hi6421_buck4, BUCK4),
 115         HI6421_REGULATOR_OF_MATCH(hi6421_buck5, BUCK5),
 116 };
 117
 118 /* LDO 0, 4~7, 9~14, 16~20 have same voltage table. */
 119 static const unsigned int ldo_0_voltages[] = {
 120         1500000, 1800000, 2400000, 2500000,
 121         2600000, 2700000, 2850000, 3000000,
 122 };
 123
 124 /* LDO 8, 15 have same voltage table. */
 125 static const unsigned int ldo_8_voltages[] = {
 126         1500000, 1800000, 2400000, 2600000,
 127         2700000, 2850000, 3000000, 3300000,
 128 };
 129
 130 /* Ranges are sorted in ascending order. */
 131 static const struct regulator_linear_range ldo_audio_volt_range[] = {
 132         REGULATOR_LINEAR_RANGE(2800000, 0, 3, 50000),
 133         REGULATOR_LINEAR_RANGE(3000000, 4, 7, 100000),
 134 };
 135
 136 static const unsigned int buck_3_voltages[] = {
 137          950000, 1050000, 1100000, 1117000,
 138         1134000, 1150000, 1167000, 1200000,
 139 };
 140
 141 static const unsigned int buck_4_voltages[] = {
 142         1150000, 1200000, 1250000, 1350000,
 143         1700000, 1800000, 1900000, 2000000,
 144 };
 145
 146 static const unsigned int buck_5_voltages[] = {
 147         1150000, 1200000, 1250000, 1350000,
 148         1600000, 1700000, 1800000, 1900000,
 149 };
 150
 151 static const struct regulator_ops hi6421_ldo_ops;
 152 static const struct regulator_ops hi6421_ldo_linear_ops;
 153 static const struct regulator_ops hi6421_ldo_linear_range_ops;
 154 static const struct regulator_ops hi6421_buck012_ops;
 155 static const struct regulator_ops hi6421_buck345_ops;
 156
 157 #define HI6421_LDO_ENABLE_TIME (350)
 158 /*
 159  * _id - LDO id name string
 160  * v_table - voltage table
 161  * vreg - voltage select register
 162  * vmask - voltage select mask
 163  * ereg - enable register
 164  * emask - enable mask
 165  * odelay - off/on delay time in uS
 166  * ecomask - eco mode mask
 167  * ecoamp - eco mode load uppler limit in uA
 168  */
 169 #define HI6421_LDO(_id, v_table, vreg, vmask, ereg, emask,              \
 170                    odelay, ecomask, ecoamp)                             \
 171         [HI6421_##_id] = {                                              \
 172                 .desc = {                                               \
 173                         .name           = #_id,                         \
 174                         .ops            = &hi6421_ldo_ops,              \
 175                         .type           = REGULATOR_VOLTAGE,            \
 176                         .id             = HI6421_##_id,                 \
 177                         .owner          = THIS_MODULE,                  \
 178                         .n_voltages     = ARRAY_SIZE(v_table),          \
 179                         .volt_table     = v_table,                      \
 180                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 181                         .vsel_mask      = vmask,                        \
 182                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 183                         .enable_mask    = emask,                        \
 184                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 185                         .off_on_delay   = odelay,                       \
 186                 },                                                      \
 187                 .mode_mask              = ecomask,                      \
 188                 .eco_microamp           = ecoamp,                       \
 189         }
 190
 191 /* HI6421 LDO1~3 are linear voltage regulators at fixed uV_step
 192  *
 193  * _id - LDO id name string
 194  * _min_uV - minimum voltage supported in uV
 195  * n_volt - number of votages available
 196  * vstep - voltage increase in each linear step in uV
 197  * vreg - voltage select register
 198  * vmask - voltage select mask
 199  * ereg - enable register
 200  * emask - enable mask
 201  * odelay - off/on delay time in uS
 202  * ecomask - eco mode mask
 203  * ecoamp - eco mode load uppler limit in uA
 204  */
 205 #define HI6421_LDO_LINEAR(_id, _min_uV, n_volt, vstep, vreg, vmask,     \
 206                           ereg, emask, odelay, ecomask, ecoamp)         \
 207         [HI6421_##_id] = {                                              \
 208                 .desc = {                                               \
 209                         .name           = #_id,                         \
 210                         .ops            = &hi6421_ldo_linear_ops,       \
 211                         .type           = REGULATOR_VOLTAGE,            \
 212                         .id             = HI6421_##_id,                 \
 213                         .owner          = THIS_MODULE,                  \
 214                         .min_uV         = _min_uV,                      \
 215                         .n_voltages     = n_volt,                       \
 216                         .uV_step        = vstep,                        \
 217                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 218                         .vsel_mask      = vmask,                        \
 219                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 220                         .enable_mask    = emask,                        \
 221                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 222                         .off_on_delay   = odelay,                       \
 223                 },                                                      \
 224                 .mode_mask              = ecomask,                      \
 225                 .eco_microamp           = ecoamp,                       \
 226         }
 227
 228 /* HI6421 LDOAUDIO is a linear voltage regulator with two 4-step ranges
 229  *
 230  * _id - LDO id name string
 231  * n_volt - number of votages available
 232  * volt_ranges - array of regulator_linear_range
 233  * vstep - voltage increase in each linear step in uV
 234  * vreg - voltage select register
 235  * vmask - voltage select mask
 236  * ereg - enable register
 237  * emask - enable mask
 238  * odelay - off/on delay time in uS
 239  * ecomask - eco mode mask
 240  * ecoamp - eco mode load uppler limit in uA
 241  */
 242 #define HI6421_LDO_LINEAR_RANGE(_id, n_volt, volt_ranges, vreg, vmask,  \
 243                                 ereg, emask, odelay, ecomask, ecoamp)   \
 244         [HI6421_##_id] = {                                              \
 245                 .desc = {                                               \
 246                         .name           = #_id,                         \
 247                         .ops            = &hi6421_ldo_linear_range_ops, \
 248                         .type           = REGULATOR_VOLTAGE,            \
 249                         .id             = HI6421_##_id,                 \
 250                         .owner          = THIS_MODULE,                  \
 251                         .n_voltages     = n_volt,                       \
 252                         .linear_ranges  = volt_ranges,                  \
 253                         .n_linear_ranges = ARRAY_SIZE(volt_ranges),     \
 254                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 255                         .vsel_mask      = vmask,                        \
 256                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 257                         .enable_mask    = emask,                        \
 258                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 259                         .off_on_delay   = odelay,                       \
 260                 },                                                      \
 261                 .mode_mask              = ecomask,                      \
 262                 .eco_microamp           = ecoamp,                       \
 263         }
 264
 265 /* HI6421 BUCK0/1/2 are linear voltage regulators at fixed uV_step
 266  *
 267  * _id - BUCK0/1/2 id name string
 268  * vreg - voltage select register
 269  * vmask - voltage select mask
 270  * ereg - enable register
 271  * emask - enable mask
 272  * sleepmask - mask of sleep mode
 273  * etime - enable time
 274  * odelay - off/on delay time in uS
 275  */
 276 #define HI6421_BUCK012(_id, vreg, vmask, ereg, emask, sleepmask,        \
 277                         etime, odelay)                                  \
 278         [HI6421_##_id] = {                                              \
 279                 .desc = {                                               \
 280                         .name           = #_id,                         \
 281                         .ops            = &hi6421_buck012_ops,          \
 282                         .type           = REGULATOR_VOLTAGE,            \
 283                         .id             = HI6421_##_id,                 \
 284                         .owner          = THIS_MODULE,                  \
 285                         .min_uV         = 700000,                       \
 286                         .n_voltages     = 128,                          \
 287                         .uV_step        = 7086,                         \
 288                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 289                         .vsel_mask      = vmask,                        \
 290                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 291                         .enable_mask    = emask,                        \
 292                         .enable_time    = etime,                        \
 293                         .off_on_delay   = odelay,                       \
 294                 },                                                      \
 295                 .mode_mask              = sleepmask,                    \
 296         }
 297
 298 /* HI6421 BUCK3/4/5 share similar configurations as LDOs, with exception
 299  *  that it supports SLEEP mode, so has different .ops.
 300  *
 301  * _id - LDO id name string
 302  * v_table - voltage table
 303  * vreg - voltage select register
 304  * vmask - voltage select mask
 305  * ereg - enable register
 306  * emask - enable mask
 307  * odelay - off/on delay time in uS
 308  * sleepmask - mask of sleep mode
 309  */
 310 #define HI6421_BUCK345(_id, v_table, vreg, vmask, ereg, emask,          \
 311                         odelay, sleepmask)                              \
 312         [HI6421_##_id] = {                                              \
 313                 .desc = {                                               \
 314                         .name           = #_id,                         \
 315                         .ops            = &hi6421_buck345_ops,          \
 316                         .type           = REGULATOR_VOLTAGE,            \
 317                         .id             = HI6421_##_id,                 \
 318                         .owner          = THIS_MODULE,                  \
 319                         .n_voltages     = ARRAY_SIZE(v_table),          \
 320                         .volt_table     = v_table,                      \
 321                         .vsel_reg       = HI6421_REG_TO_BUS_ADDR(vreg), \
 322                         .vsel_mask      = vmask,                        \
 323                         .enable_reg     = HI6421_REG_TO_BUS_ADDR(ereg), \
 324                         .enable_mask    = emask,                        \
 325                         .enable_time    = HI6421_LDO_ENABLE_TIME,       \
 326                         .off_on_delay   = odelay,                       \
 327                 },                                                      \
 328                 .mode_mask              = sleepmask,                    \
 329         }
 330
 331 /* HI6421 regulator information */
 332 static struct hi6421_regulator_info
 333                 hi6421_regulator_info[HI6421_NUM_REGULATORS] = {
 334         HI6421_LDO(LDO0, ldo_0_voltages, 0x20, 0x07, 0x20, 0x10,
 335                    10000, 0x20, 8000),
 336         HI6421_LDO_LINEAR(LDO1, 1700000, 4, 100000, 0x21, 0x03, 0x21, 0x10,
 337                           10000, 0x20, 5000),
 338         HI6421_LDO_LINEAR(LDO2, 1050000, 8, 50000, 0x22, 0x07, 0x22, 0x10,
 339                           20000, 0x20, 8000),
 340         HI6421_LDO_LINEAR(LDO3, 1050000, 8, 50000, 0x23, 0x07, 0x23, 0x10,
 341                           20000, 0x20, 8000),
 342         HI6421_LDO(LDO4, ldo_0_voltages, 0x24, 0x07, 0x24, 0x10,
 343                    20000, 0x20, 8000),
 344         HI6421_LDO(LDO5, ldo_0_voltages, 0x25, 0x07, 0x25, 0x10,
 345                    20000, 0x20, 8000),
 346         HI6421_LDO(LDO6, ldo_0_voltages, 0x26, 0x07, 0x26, 0x10,
 347                    20000, 0x20, 8000),
 348         HI6421_LDO(LDO7, ldo_0_voltages, 0x27, 0x07, 0x27, 0x10,
 349                    20000, 0x20, 5000),
 350         HI6421_LDO(LDO8, ldo_8_voltages, 0x28, 0x07, 0x28, 0x10,
 351                    20000, 0x20, 8000),
 352         HI6421_LDO(LDO9, ldo_0_voltages, 0x29, 0x07, 0x29, 0x10,
 353                    40000, 0x20, 8000),
 354         HI6421_LDO(LDO10, ldo_0_voltages, 0x2a, 0x07, 0x2a, 0x10,
 355                    40000, 0x20, 8000),
 356         HI6421_LDO(LDO11, ldo_0_voltages, 0x2b, 0x07, 0x2b, 0x10,
 357                    40000, 0x20, 8000),
 358         HI6421_LDO(LDO12, ldo_0_voltages, 0x2c, 0x07, 0x2c, 0x10,
 359                    40000, 0x20, 8000),
 360         HI6421_LDO(LDO13, ldo_0_voltages, 0x2d, 0x07, 0x2d, 0x10,
 361                    40000, 0x20, 8000),
 362         HI6421_LDO(LDO14, ldo_0_voltages, 0x2e, 0x07, 0x2e, 0x10,
 363                    40000, 0x20, 8000),
 364         HI6421_LDO(LDO15, ldo_8_voltages, 0x2f, 0x07, 0x2f, 0x10,
 365                    40000, 0x20, 8000),
 366         HI6421_LDO(LDO16, ldo_0_voltages, 0x30, 0x07, 0x30, 0x10,
 367                    40000, 0x20, 8000),
 368         HI6421_LDO(LDO17, ldo_0_voltages, 0x31, 0x07, 0x31, 0x10,
 369                    40000, 0x20, 8000),
 370         HI6421_LDO(LDO18, ldo_0_voltages, 0x32, 0x07, 0x32, 0x10,
 371                    40000, 0x20, 8000),
 372         HI6421_LDO(LDO19, ldo_0_voltages, 0x33, 0x07, 0x33, 0x10,
 373                    40000, 0x20, 8000),
 374         HI6421_LDO(LDO20, ldo_0_voltages, 0x34, 0x07, 0x34, 0x10,
 375                    40000, 0x20, 8000),
 376         HI6421_LDO_LINEAR_RANGE(LDOAUDIO, 8, ldo_audio_volt_range, 0x36,
 377                                 0x70, 0x36, 0x01, 40000, 0x02, 5000),
 378         HI6421_BUCK012(BUCK0, 0x0d, 0x7f, 0x0c, 0x01, 0x10, 400, 20000),
 379         HI6421_BUCK012(BUCK1, 0x0f, 0x7f, 0x0e, 0x01, 0x10, 400, 20000),
 380         HI6421_BUCK012(BUCK2, 0x11, 0x7f, 0x10, 0x01, 0x10, 350, 100),
 381         HI6421_BUCK345(BUCK3, buck_3_voltages, 0x13, 0x07, 0x12, 0x01,
 382                        20000, 0x10),
 383         HI6421_BUCK345(BUCK4, buck_4_voltages, 0x15, 0x07, 0x14, 0x01,
 384                        20000, 0x10),
 385         HI6421_BUCK345(BUCK5, buck_5_voltages, 0x17, 0x07, 0x16, 0x01,
 386                        20000, 0x10),
 387 };
 388
 389 static int hi6421_regulator_enable(struct regulator_dev *rdev)
 390 {
 391         struct hi6421_regulator_pdata *pdata;
 392
 393         pdata = dev_get_drvdata(rdev->dev.parent);
 394         /* hi6421 spec requires regulator enablement must be serialized:
 395          *  - Because when BUCK, LDO switching from off to on, it will have
 396          *    a huge instantaneous current; so you can not turn on two or
 397          *    more LDO or BUCKs simultaneously, or it may burn the chip.
 398          */
 399         mutex_lock(&pdata->lock);
 400
 401         /* call regulator regmap helper */
 402         regulator_enable_regmap(rdev);
 403
 404         mutex_unlock(&pdata->lock);
 405         return 0;
 406 }
 407
 408 static unsigned int hi6421_regulator_ldo_get_mode(struct regulator_dev *rdev)
 409 {
 410         struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
 411         u32 reg_val;
 412
 413         regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 414         if (reg_val & info->mode_mask)
 415                 return REGULATOR_MODE_IDLE;
 416
 417         return REGULATOR_MODE_NORMAL;
 418 }
 419
 420 static unsigned int hi6421_regulator_buck_get_mode(struct regulator_dev *rdev)
 421 {
 422         struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
 423         u32 reg_val;
 424
 425         regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 426         if (reg_val & info->mode_mask)
 427                 return REGULATOR_MODE_STANDBY;
 428
 429         return REGULATOR_MODE_NORMAL;
 430 }
 431
 432 static int hi6421_regulator_ldo_set_mode(struct regulator_dev *rdev,
 433                                                 unsigned int mode)
 434 {
 435         struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
 436         u32 new_mode;
 437
 438         switch (mode) {
 439         case REGULATOR_MODE_NORMAL:
 440                 new_mode = 0;
 441                 break;
 442         case REGULATOR_MODE_IDLE:
 443                 new_mode = info->mode_mask;
 444                 break;
 445         default:
 446                 return -EINVAL;
 447         }
 448
 449         /* set mode */
 450         regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 451                            info->mode_mask, new_mode);
 452
 453         return 0;
 454 }
 455
 456 static int hi6421_regulator_buck_set_mode(struct regulator_dev *rdev,
 457                                                 unsigned int mode)
 458 {
 459         struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
 460         u32 new_mode;
 461
 462         switch (mode) {
 463         case REGULATOR_MODE_NORMAL:
 464                 new_mode = 0;
 465                 break;
 466         case REGULATOR_MODE_STANDBY:
 467                 new_mode = info->mode_mask;
 468                 break;
 469         default:
 470                 return -EINVAL;
 471         }
 472
 473         /* set mode */
 474         regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 475                            info->mode_mask, new_mode);
 476
 477         return 0;
 478 }
 479
 480 unsigned int hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
 481                         int input_uV, int output_uV, int load_uA)
 482 {
 483         struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
 484
 485         if (load_uA > info->eco_microamp)
 486                 return REGULATOR_MODE_NORMAL;
 487
 488         return REGULATOR_MODE_IDLE;
 489 }
 490
 491 static const struct regulator_ops hi6421_ldo_ops = {
 492         .is_enabled = regulator_is_enabled_regmap,
 493         .enable = hi6421_regulator_enable,
 494         .disable = regulator_disable_regmap,
 495         .list_voltage = regulator_list_voltage_table,
 496         .map_voltage = regulator_map_voltage_ascend,
 497         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 498         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 499         .get_mode = hi6421_regulator_ldo_get_mode,
 500         .set_mode = hi6421_regulator_ldo_set_mode,
 501         .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
 502 };
 503
 504 static const struct regulator_ops hi6421_ldo_linear_ops = {
 505         .is_enabled = regulator_is_enabled_regmap,
 506         .enable = hi6421_regulator_enable,
 507         .disable = regulator_disable_regmap,
 508         .list_voltage = regulator_list_voltage_linear,
 509         .map_voltage = regulator_map_voltage_linear,
 510         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 511         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 512         .get_mode = hi6421_regulator_ldo_get_mode,
 513         .set_mode = hi6421_regulator_ldo_set_mode,
 514         .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
 515 };
 516
 517 static const struct regulator_ops hi6421_ldo_linear_range_ops = {
 518         .is_enabled = regulator_is_enabled_regmap,
 519         .enable = hi6421_regulator_enable,
 520         .disable = regulator_disable_regmap,
 521         .list_voltage = regulator_list_voltage_linear_range,
 522         .map_voltage = regulator_map_voltage_linear_range,
 523         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 524         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 525         .get_mode = hi6421_regulator_ldo_get_mode,
 526         .set_mode = hi6421_regulator_ldo_set_mode,
 527         .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
 528 };
 529
 530 static const struct regulator_ops hi6421_buck012_ops = {
 531         .is_enabled = regulator_is_enabled_regmap,
 532         .enable = hi6421_regulator_enable,
 533         .disable = regulator_disable_regmap,
 534         .list_voltage = regulator_list_voltage_linear,
 535         .map_voltage = regulator_map_voltage_linear,
 536         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 537         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 538         .get_mode = hi6421_regulator_buck_get_mode,
 539         .set_mode = hi6421_regulator_buck_set_mode,
 540 };
 541
 542 static const struct regulator_ops hi6421_buck345_ops = {
 543         .is_enabled = regulator_is_enabled_regmap,
 544         .enable = hi6421_regulator_enable,
 545         .disable = regulator_disable_regmap,
 546         .list_voltage = regulator_list_voltage_table,
 547         .map_voltage = regulator_map_voltage_ascend,
 548         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 549         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 550         .get_mode = hi6421_regulator_buck_get_mode,
 551         .set_mode = hi6421_regulator_buck_set_mode,
 552 };
 553
 554 static int hi6421_regulator_register(struct platform_device *pdev,
 555                                      struct regmap *rmap,
 556                                      struct regulator_init_data *init_data,
 557                                      int id, struct device_node *np)
 558 {
 559         struct hi6421_regulator_info *info = NULL;
 560         struct regulator_config config = { };
 561         struct regulator_dev *rdev;
 562
 563         /* assign per-regulator data */
 564         info = &hi6421_regulator_info[id];
 565
 566         config.dev = &pdev->dev;
 567         config.init_data = init_data;
 568         config.driver_data = info;
 569         config.regmap = rmap;
 570         config.of_node = np;
 571
 572         /* register regulator with framework */
 573         rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
 574         if (IS_ERR(rdev)) {
 575                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 576                         info->desc.name);
 577                 return PTR_ERR(rdev);
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int hi6421_regulator_probe(struct platform_device *pdev)
 584 {
 585         struct device *dev = &pdev->dev;
 586         struct device_node *np;
 587         struct hi6421_pmic *pmic;
 588         struct hi6421_regulator_pdata *pdata;
 589         int i, ret = 0;
 590
 591         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 592         if (!pdata)
 593                 return -ENOMEM;
 594         mutex_init(&pdata->lock);
 595         platform_set_drvdata(pdev, pdata);
 596
 597         np = of_get_child_by_name(dev->parent->of_node, "regulators");
 598         if (!np)
 599                 return -ENODEV;
 600
 601         ret = of_regulator_match(dev, np,
 602                                  hi6421_regulator_match,
 603                                  ARRAY_SIZE(hi6421_regulator_match));
 604         of_node_put(np);
 605         if (ret < 0) {
 606                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 607                 return ret;
 608         }
 609
 610         pmic = dev_get_drvdata(dev->parent);
 611
 612         for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
 613                 ret = hi6421_regulator_register(pdev, pmic->regmap,
 614                         hi6421_regulator_match[i].init_data, i,
 615                         hi6421_regulator_match[i].of_node);
 616                 if (ret)
 617                         return ret;
 618         }
 619
 620         return 0;
 621 }
 622
 623 static struct platform_driver hi6421_regulator_driver = {
 624         .driver = {
 625                 .name   = "hi6421-regulator",
 626         },
 627         .probe  = hi6421_regulator_probe,
 628 };
 629 module_platform_driver(hi6421_regulator_driver);
 630
 631 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
 632 MODULE_DESCRIPTION("Hi6421 regulator driver");
 633 MODULE_LICENSE("GPL v2");