drivers/regulator/mt6331-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2022 Collabora Ltd.
   4 // Author: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
   5 //
   6 // Based on mt6323-regulator.c,
   7 //     Copyright (c) 2016 MediaTek Inc.
   8 //
   9
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14 #include <linux/mfd/mt6397/core.h>
  15 #include <linux/mfd/mt6331/registers.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/regulator/mt6331-regulator.h>
  19 #include <linux/regulator/of_regulator.h>
  20
  21 #define MT6331_LDO_MODE_NORMAL  0
  22 #define MT6331_LDO_MODE_LP      1
  23
  24 /*
  25  * MT6331 regulators information
  26  *
  27  * @desc: standard fields of regulator description.
  28  * @qi: Mask for query enable signal status of regulators
  29  * @vselon_reg: Register sections for hardware control mode of bucks
  30  * @vselctrl_reg: Register for controlling the buck control mode.
  31  * @vselctrl_mask: Mask for query buck's voltage control mode.
  32  * @status_reg: Register for regulator enable status where qi unavailable
  33  * @status_mask: Mask for querying regulator enable status
  34  */
  35 struct mt6331_regulator_info {
  36         struct regulator_desc desc;
  37         u32 qi;
  38         u32 vselon_reg;
  39         u32 vselctrl_reg;
  40         u32 vselctrl_mask;
  41         u32 modeset_reg;
  42         u32 modeset_mask;
  43         u32 status_reg;
  44         u32 status_mask;
  45 };
  46
  47 #define MT6331_BUCK(match, vreg, min, max, step, volt_ranges, enreg,    \
  48                 vosel, vosel_mask, voselon, vosel_ctrl)                 \
  49 [MT6331_ID_##vreg] = {                                                  \
  50         .desc = {                                                       \
  51                 .name = #vreg,                                          \
  52                 .of_match = of_match_ptr(match),                        \
  53                 .ops = &mt6331_volt_range_ops,                          \
  54                 .type = REGULATOR_VOLTAGE,                              \
  55                 .id = MT6331_ID_##vreg,                                 \
  56                 .owner = THIS_MODULE,                                   \
  57                 .n_voltages = (max - min)/step + 1,                     \
  58                 .linear_ranges = volt_ranges,                           \
  59                 .n_linear_ranges = ARRAY_SIZE(volt_ranges),             \
  60                 .vsel_reg = vosel,                                      \
  61                 .vsel_mask = vosel_mask,                                \
  62                 .enable_reg = enreg,                                    \
  63                 .enable_mask = BIT(0),                                  \
  64         },                                                              \
  65         .qi = BIT(13),                                                  \
  66         .vselon_reg = voselon,                                          \
  67         .vselctrl_reg = vosel_ctrl,                                     \
  68         .vselctrl_mask = BIT(1),                                        \
  69         .status_mask = 0,                                               \
  70 }
  71
  72 #define MT6331_LDO_AO(match, vreg, ldo_volt_table, vosel, vosel_mask)   \
  73 [MT6331_ID_##vreg] = {                                                  \
  74         .desc = {                                                       \
  75                 .name = #vreg,                                          \
  76                 .of_match = of_match_ptr(match),                        \
  77                 .ops = &mt6331_volt_table_ao_ops,                       \
  78                 .type = REGULATOR_VOLTAGE,                              \
  79                 .id = MT6331_ID_##vreg,                                 \
  80                 .owner = THIS_MODULE,                                   \
  81                 .n_voltages = ARRAY_SIZE(ldo_volt_table),               \
  82                 .volt_table = ldo_volt_table,                           \
  83                 .vsel_reg = vosel,                                      \
  84                 .vsel_mask = vosel_mask,                                \
  85         },                                                              \
  86 }
  87
  88 #define MT6331_LDO_S(match, vreg, ldo_volt_table, enreg, enbit, vosel,  \
  89                      vosel_mask, _modeset_reg, _modeset_mask,           \
  90                      _status_reg, _status_mask)                         \
  91 [MT6331_ID_##vreg] = {                                                  \
  92         .desc = {                                                       \
  93                 .name = #vreg,                                          \
  94                 .of_match = of_match_ptr(match),                        \
  95                 .ops = &mt6331_volt_table_no_qi_ops,                    \
  96                 .type = REGULATOR_VOLTAGE,                              \
  97                 .id = MT6331_ID_##vreg,                                 \
  98                 .owner = THIS_MODULE,                                   \
  99                 .n_voltages = ARRAY_SIZE(ldo_volt_table),               \
 100                 .volt_table = ldo_volt_table,                           \
 101                 .vsel_reg = vosel,                                      \
 102                 .vsel_mask = vosel_mask,                                \
 103                 .enable_reg = enreg,                                    \
 104                 .enable_mask = BIT(enbit),                              \
 105         },                                                              \
 106         .modeset_reg = _modeset_reg,                                    \
 107         .modeset_mask = _modeset_mask,                                  \
 108         .status_reg = _status_reg,                                      \
 109         .status_mask = _status_mask,                                    \
 110 }
 111
 112 #define MT6331_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel,    \
 113                    vosel_mask, _modeset_reg, _modeset_mask)             \
 114 [MT6331_ID_##vreg] = {                                                  \
 115         .desc = {                                                       \
 116                 .name = #vreg,                                          \
 117                 .of_match = of_match_ptr(match),                        \
 118                 .ops = (_modeset_reg ?                                  \
 119                         &mt6331_volt_table_ops :                        \
 120                         &mt6331_volt_table_no_ms_ops),                  \
 121                 .type = REGULATOR_VOLTAGE,                              \
 122                 .id = MT6331_ID_##vreg,                                 \
 123                 .owner = THIS_MODULE,                                   \
 124                 .n_voltages = ARRAY_SIZE(ldo_volt_table),               \
 125                 .volt_table = ldo_volt_table,                           \
 126                 .vsel_reg = vosel,                                      \
 127                 .vsel_mask = vosel_mask,                                \
 128                 .enable_reg = enreg,                                    \
 129                 .enable_mask = BIT(enbit),                              \
 130         },                                                              \
 131         .qi = BIT(15),                                                  \
 132         .modeset_reg = _modeset_reg,                                    \
 133         .modeset_mask = _modeset_mask,                                  \
 134 }
 135
 136 #define MT6331_REG_FIXED(match, vreg, enreg, enbit, qibit, volt,        \
 137                          _modeset_reg, _modeset_mask)                   \
 138 [MT6331_ID_##vreg] = {                                                  \
 139         .desc = {                                                       \
 140                 .name = #vreg,                                          \
 141                 .of_match = of_match_ptr(match),                        \
 142                 .ops = (_modeset_reg ?                                  \
 143                         &mt6331_volt_fixed_ops :                        \
 144                         &mt6331_volt_fixed_no_ms_ops),                  \
 145                 .type = REGULATOR_VOLTAGE,                              \
 146                 .id = MT6331_ID_##vreg,                                 \
 147                 .owner = THIS_MODULE,                                   \
 148                 .n_voltages = 1,                                        \
 149                 .enable_reg = enreg,                                    \
 150                 .enable_mask = BIT(enbit),                              \
 151                 .min_uV = volt,                                         \
 152         },                                                              \
 153         .qi = BIT(qibit),                                               \
 154         .modeset_reg = _modeset_reg,                                    \
 155         .modeset_mask = _modeset_mask,                                  \
 156 }
 157
 158 static const struct linear_range buck_volt_range[] = {
 159         REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
 160 };
 161
 162 static const unsigned int ldo_volt_table1[] = {
 163         2800000, 3000000, 0, 3200000
 164 };
 165
 166 static const unsigned int ldo_volt_table2[] = {
 167         1500000, 1800000, 2500000, 2800000,
 168 };
 169
 170 static const unsigned int ldo_volt_table3[] = {
 171         1200000, 1300000, 1500000, 1800000, 2000000, 2800000, 3000000, 3300000,
 172 };
 173
 174 static const unsigned int ldo_volt_table4[] = {
 175         0, 0, 1700000, 1800000, 1860000, 2760000, 3000000, 3100000,
 176 };
 177
 178 static const unsigned int ldo_volt_table5[] = {
 179         1800000, 3300000, 1800000, 3300000,
 180 };
 181
 182 static const unsigned int ldo_volt_table6[] = {
 183         3000000, 3300000,
 184 };
 185
 186 static const unsigned int ldo_volt_table7[] = {
 187         1200000, 1600000, 1700000, 1800000, 1900000, 2000000, 2100000, 2200000,
 188 };
 189
 190 static const unsigned int ldo_volt_table8[] = {
 191         900000, 1000000, 1100000, 1220000, 1300000, 1500000, 1500000, 1500000,
 192 };
 193
 194 static const unsigned int ldo_volt_table9[] = {
 195         1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1300000,
 196 };
 197
 198 static const unsigned int ldo_volt_table10[] = {
 199         1200000, 1300000, 1500000, 1800000,
 200 };
 201
 202 static const unsigned int ldo_volt_table11[] = {
 203         1200000, 1300000, 1400000, 1500000, 1600000, 1700000, 1800000, 1800000,
 204 };
 205
 206 static int mt6331_get_status(struct regulator_dev *rdev)
 207 {
 208         struct mt6331_regulator_info *info = rdev_get_drvdata(rdev);
 209         u32 regval;
 210         int ret;
 211
 212         ret = regmap_read(rdev->regmap, info->desc.enable_reg, &regval);
 213         if (ret != 0) {
 214                 dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
 215                 return ret;
 216         }
 217
 218         return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
 219 }
 220
 221 static int mt6331_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 222 {
 223         struct mt6331_regulator_info *info = rdev_get_drvdata(rdev);
 224         int val;
 225
 226         switch (mode) {
 227         case REGULATOR_MODE_STANDBY:
 228                 val = MT6331_LDO_MODE_LP;
 229                 break;
 230         case REGULATOR_MODE_NORMAL:
 231                 val = MT6331_LDO_MODE_NORMAL;
 232                 break;
 233         default:
 234                 return -EINVAL;
 235         }
 236
 237         val <<= ffs(info->modeset_mask) - 1;
 238
 239         return regmap_update_bits(rdev->regmap, info->modeset_reg,
 240                                   info->modeset_mask, val);
 241 }
 242
 243 static unsigned int mt6331_ldo_get_mode(struct regulator_dev *rdev)
 244 {
 245         struct mt6331_regulator_info *info = rdev_get_drvdata(rdev);
 246         unsigned int val;
 247         int ret;
 248
 249         ret = regmap_read(rdev->regmap, info->modeset_reg, &val);
 250         if (ret < 0)
 251                 return ret;
 252
 253         val &= info->modeset_mask;
 254         val >>= ffs(info->modeset_mask) - 1;
 255
 256         return (val & BIT(0)) ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
 257 }
 258
 259 static const struct regulator_ops mt6331_volt_range_ops = {
 260         .list_voltage = regulator_list_voltage_linear_range,
 261         .map_voltage = regulator_map_voltage_linear_range,
 262         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 263         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 264         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 265         .enable = regulator_enable_regmap,
 266         .disable = regulator_disable_regmap,
 267         .is_enabled = regulator_is_enabled_regmap,
 268         .get_status = mt6331_get_status,
 269 };
 270
 271 static const struct regulator_ops mt6331_volt_table_no_ms_ops = {
 272         .list_voltage = regulator_list_voltage_table,
 273         .map_voltage = regulator_map_voltage_iterate,
 274         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 275         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 276         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 277         .enable = regulator_enable_regmap,
 278         .disable = regulator_disable_regmap,
 279         .is_enabled = regulator_is_enabled_regmap,
 280         .get_status = mt6331_get_status,
 281 };
 282
 283 static const struct regulator_ops mt6331_volt_table_no_qi_ops = {
 284         .list_voltage = regulator_list_voltage_table,
 285         .map_voltage = regulator_map_voltage_iterate,
 286         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 287         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 288         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 289         .enable = regulator_enable_regmap,
 290         .disable = regulator_disable_regmap,
 291         .is_enabled = regulator_is_enabled_regmap,
 292         .set_mode = mt6331_ldo_set_mode,
 293         .get_mode = mt6331_ldo_get_mode,
 294 };
 295
 296 static const struct regulator_ops mt6331_volt_table_ops = {
 297         .list_voltage = regulator_list_voltage_table,
 298         .map_voltage = regulator_map_voltage_iterate,
 299         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 300         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 301         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 302         .enable = regulator_enable_regmap,
 303         .disable = regulator_disable_regmap,
 304         .is_enabled = regulator_is_enabled_regmap,
 305         .get_status = mt6331_get_status,
 306         .set_mode = mt6331_ldo_set_mode,
 307         .get_mode = mt6331_ldo_get_mode,
 308 };
 309
 310 static const struct regulator_ops mt6331_volt_table_ao_ops = {
 311         .list_voltage = regulator_list_voltage_table,
 312         .map_voltage = regulator_map_voltage_iterate,
 313         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 314         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 315         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 316 };
 317
 318 static const struct regulator_ops mt6331_volt_fixed_no_ms_ops = {
 319         .list_voltage = regulator_list_voltage_linear,
 320         .enable = regulator_enable_regmap,
 321         .disable = regulator_disable_regmap,
 322         .is_enabled = regulator_is_enabled_regmap,
 323         .get_status = mt6331_get_status,
 324 };
 325
 326 static const struct regulator_ops mt6331_volt_fixed_ops = {
 327         .list_voltage = regulator_list_voltage_linear,
 328         .enable = regulator_enable_regmap,
 329         .disable = regulator_disable_regmap,
 330         .is_enabled = regulator_is_enabled_regmap,
 331         .get_status = mt6331_get_status,
 332         .set_mode = mt6331_ldo_set_mode,
 333         .get_mode = mt6331_ldo_get_mode,
 334 };
 335
 336 /* The array is indexed by id(MT6331_ID_XXX) */
 337 static struct mt6331_regulator_info mt6331_regulators[] = {
 338         MT6331_BUCK("buck-vdvfs11", VDVFS11, 700000, 1493750, 6250,
 339                     buck_volt_range, MT6331_VDVFS11_CON9,
 340                     MT6331_VDVFS11_CON11, GENMASK(6, 0),
 341                     MT6331_VDVFS11_CON12, MT6331_VDVFS11_CON7),
 342         MT6331_BUCK("buck-vdvfs12", VDVFS12, 700000, 1493750, 6250,
 343                     buck_volt_range, MT6331_VDVFS12_CON9,
 344                     MT6331_VDVFS12_CON11, GENMASK(6, 0),
 345                     MT6331_VDVFS12_CON12, MT6331_VDVFS12_CON7),
 346         MT6331_BUCK("buck-vdvfs13", VDVFS13, 700000, 1493750, 6250,
 347                     buck_volt_range, MT6331_VDVFS13_CON9,
 348                     MT6331_VDVFS13_CON11, GENMASK(6, 0),
 349                     MT6331_VDVFS13_CON12, MT6331_VDVFS13_CON7),
 350         MT6331_BUCK("buck-vdvfs14", VDVFS14, 700000, 1493750, 6250,
 351                     buck_volt_range, MT6331_VDVFS14_CON9,
 352                     MT6331_VDVFS14_CON11, GENMASK(6, 0),
 353                     MT6331_VDVFS14_CON12, MT6331_VDVFS14_CON7),
 354         MT6331_BUCK("buck-vcore2", VCORE2, 700000, 1493750, 6250,
 355                     buck_volt_range, MT6331_VCORE2_CON9,
 356                     MT6331_VCORE2_CON11, GENMASK(6, 0),
 357                     MT6331_VCORE2_CON12, MT6331_VCORE2_CON7),
 358         MT6331_REG_FIXED("buck-vio18", VIO18, MT6331_VIO18_CON9, 0, 13, 1800000, 0, 0),
 359         MT6331_REG_FIXED("ldo-vrtc", VRTC, MT6331_DIGLDO_CON11, 8, 15, 2800000, 0, 0),
 360         MT6331_REG_FIXED("ldo-vtcxo1", VTCXO1, MT6331_ANALDO_CON1, 10, 15, 2800000,
 361                          MT6331_ANALDO_CON1, GENMASK(1, 0)),
 362         MT6331_REG_FIXED("ldo-vtcxo2", VTCXO2, MT6331_ANALDO_CON2, 10, 15, 2800000,
 363                          MT6331_ANALDO_CON2, GENMASK(1, 0)),
 364         MT6331_REG_FIXED("ldo-vsram", VSRAM_DVFS1, MT6331_SYSLDO_CON4, 10, 15, 1012500,
 365                          MT6331_SYSLDO_CON4, GENMASK(1, 0)),
 366         MT6331_REG_FIXED("ldo-vio28", VIO28, MT6331_DIGLDO_CON1, 10, 15, 2800000,
 367                          MT6331_DIGLDO_CON1, GENMASK(1, 0)),
 368         MT6331_LDO("ldo-avdd32aud", AVDD32_AUD, ldo_volt_table1, MT6331_ANALDO_CON3, 10,
 369                    MT6331_ANALDO_CON10, GENMASK(6, 5), MT6331_ANALDO_CON3, GENMASK(1, 0)),
 370         MT6331_LDO("ldo-vauxa32", VAUXA32, ldo_volt_table1, MT6331_ANALDO_CON4, 10,
 371                    MT6331_ANALDO_CON6, GENMASK(6, 5), MT6331_ANALDO_CON4, GENMASK(1, 0)),
 372         MT6331_LDO("ldo-vemc33", VEMC33, ldo_volt_table6, MT6331_DIGLDO_CON5, 10,
 373                    MT6331_DIGLDO_CON17, BIT(6), MT6331_DIGLDO_CON5, GENMASK(1, 0)),
 374         MT6331_LDO("ldo-vibr", VIBR, ldo_volt_table3, MT6331_DIGLDO_CON12, 10,
 375                    MT6331_DIGLDO_CON20, GENMASK(6, 4), MT6331_DIGLDO_CON12, GENMASK(1, 0)),
 376         MT6331_LDO("ldo-vmc", VMC, ldo_volt_table5, MT6331_DIGLDO_CON3, 10,
 377                    MT6331_DIGLDO_CON15, GENMASK(5, 4), MT6331_DIGLDO_CON3, GENMASK(1, 0)),
 378         MT6331_LDO("ldo-vmch", VMCH, ldo_volt_table6, MT6331_DIGLDO_CON4, 10,
 379                    MT6331_DIGLDO_CON16, BIT(6), MT6331_DIGLDO_CON4, GENMASK(1, 0)),
 380         MT6331_LDO("ldo-vmipi", VMIPI, ldo_volt_table3, MT6331_SYSLDO_CON5, 10,
 381                    MT6331_SYSLDO_CON13, GENMASK(5, 3), MT6331_SYSLDO_CON5, GENMASK(1, 0)),
 382         MT6331_LDO("ldo-vsim1", VSIM1, ldo_volt_table4, MT6331_DIGLDO_CON8, 10,
 383                    MT6331_DIGLDO_CON21, GENMASK(6, 4), MT6331_DIGLDO_CON8, GENMASK(1, 0)),
 384         MT6331_LDO("ldo-vsim2", VSIM2, ldo_volt_table4, MT6331_DIGLDO_CON9, 10,
 385                    MT6331_DIGLDO_CON22, GENMASK(6, 4), MT6331_DIGLDO_CON9, GENMASK(1, 0)),
 386         MT6331_LDO("ldo-vusb10", VUSB10, ldo_volt_table9, MT6331_SYSLDO_CON2, 10,
 387                    MT6331_SYSLDO_CON10, GENMASK(5, 3), MT6331_SYSLDO_CON2, GENMASK(1, 0)),
 388         MT6331_LDO("ldo-vcama", VCAMA, ldo_volt_table2, MT6331_ANALDO_CON5, 15,
 389                    MT6331_ANALDO_CON9, GENMASK(5, 4), 0, 0),
 390         MT6331_LDO_S("ldo-vcamaf", VCAM_AF, ldo_volt_table3, MT6331_DIGLDO_CON2, 10,
 391                      MT6331_DIGLDO_CON14, GENMASK(6, 4), MT6331_DIGLDO_CON2, GENMASK(1, 0),
 392                      MT6331_EN_STATUS1, BIT(0)),
 393         MT6331_LDO_S("ldo-vcamd", VCAMD, ldo_volt_table8, MT6331_SYSLDO_CON1, 15,
 394                      MT6331_SYSLDO_CON9, GENMASK(6, 4), MT6331_SYSLDO_CON1, GENMASK(1, 0),
 395                      MT6331_EN_STATUS1, BIT(11)),
 396         MT6331_LDO_S("ldo-vcamio", VCAM_IO,  ldo_volt_table10, MT6331_SYSLDO_CON3, 10,
 397                      MT6331_SYSLDO_CON11, GENMASK(4, 3), MT6331_SYSLDO_CON3, GENMASK(1, 0),
 398                      MT6331_EN_STATUS1, BIT(13)),
 399         MT6331_LDO_S("ldo-vgp1", VGP1, ldo_volt_table3, MT6331_DIGLDO_CON6, 10,
 400                      MT6331_DIGLDO_CON19, GENMASK(6, 4), MT6331_DIGLDO_CON6, GENMASK(1, 0),
 401                      MT6331_EN_STATUS1, BIT(4)),
 402         MT6331_LDO_S("ldo-vgp2", VGP2, ldo_volt_table10, MT6331_SYSLDO_CON6, 10,
 403                      MT6331_SYSLDO_CON14, GENMASK(4, 3), MT6331_SYSLDO_CON6, GENMASK(1, 0),
 404                      MT6331_EN_STATUS1, BIT(15)),
 405         MT6331_LDO_S("ldo-vgp3", VGP3, ldo_volt_table10, MT6331_SYSLDO_CON7, 10,
 406                      MT6331_SYSLDO_CON15, GENMASK(4, 3), MT6331_SYSLDO_CON7, GENMASK(1, 0),
 407                      MT6331_EN_STATUS2, BIT(0)),
 408         MT6331_LDO_S("ldo-vgp4", VGP4, ldo_volt_table7, MT6331_DIGLDO_CON7, 10,
 409                      MT6331_DIGLDO_CON18, GENMASK(6, 4), MT6331_DIGLDO_CON7, GENMASK(1, 0),
 410                      MT6331_EN_STATUS1, BIT(5)),
 411         MT6331_LDO_AO("ldo-vdig18", VDIG18, ldo_volt_table11,
 412                       MT6331_DIGLDO_CON28, GENMASK(14, 12)),
 413 };
 414
 415 static int mt6331_set_buck_vosel_reg(struct platform_device *pdev)
 416 {
 417         struct mt6397_chip *mt6331 = dev_get_drvdata(pdev->dev.parent);
 418         int i;
 419         u32 regval;
 420
 421         for (i = 0; i < MT6331_ID_VREG_MAX; i++) {
 422                 if (mt6331_regulators[i].vselctrl_reg) {
 423                         if (regmap_read(mt6331->regmap,
 424                                 mt6331_regulators[i].vselctrl_reg,
 425                                 &regval) < 0) {
 426                                 dev_err(&pdev->dev,
 427                                         "Failed to read buck ctrl\n");
 428                                 return -EIO;
 429                         }
 430
 431                         if (regval & mt6331_regulators[i].vselctrl_mask) {
 432                                 mt6331_regulators[i].desc.vsel_reg =
 433                                 mt6331_regulators[i].vselon_reg;
 434                         }
 435                 }
 436         }
 437
 438         return 0;
 439 }
 440
 441 static int mt6331_regulator_probe(struct platform_device *pdev)
 442 {
 443         struct mt6397_chip *mt6331 = dev_get_drvdata(pdev->dev.parent);
 444         struct regulator_config config = {};
 445         struct regulator_dev *rdev;
 446         int i;
 447         u32 reg_value;
 448
 449         /* Query buck controller to select activated voltage register part */
 450         if (mt6331_set_buck_vosel_reg(pdev))
 451                 return -EIO;
 452
 453         /* Read PMIC chip revision to update constraints and voltage table */
 454         if (regmap_read(mt6331->regmap, MT6331_HWCID, &reg_value) < 0) {
 455                 dev_err(&pdev->dev, "Failed to read Chip ID\n");
 456                 return -EIO;
 457         }
 458         reg_value &= GENMASK(7, 0);
 459
 460         dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
 461
 462         /*
 463          * ChipID 0x10 is "MT6331 E1", has a different voltage table and
 464          * it's currently not supported in this driver. Upon detection of
 465          * this ID, refuse to register the regulators, as we will wrongly
 466          * interpret the VSEL for this revision, potentially overvolting
 467          * some device.
 468          */
 469         if (reg_value == 0x10) {
 470                 dev_err(&pdev->dev, "Chip version not supported. Bailing out.\n");
 471                 return -EINVAL;
 472         }
 473
 474         for (i = 0; i < MT6331_ID_VREG_MAX; i++) {
 475                 config.dev = &pdev->dev;
 476                 config.driver_data = &mt6331_regulators[i];
 477                 config.regmap = mt6331->regmap;
 478                 rdev = devm_regulator_register(&pdev->dev,
 479                                 &mt6331_regulators[i].desc, &config);
 480                 if (IS_ERR(rdev)) {
 481                         dev_err(&pdev->dev, "failed to register %s\n",
 482                                 mt6331_regulators[i].desc.name);
 483                         return PTR_ERR(rdev);
 484                 }
 485         }
 486         return 0;
 487 }
 488
 489 static const struct platform_device_id mt6331_platform_ids[] = {
 490         {"mt6331-regulator", 0},
 491         { /* sentinel */ },
 492 };
 493 MODULE_DEVICE_TABLE(platform, mt6331_platform_ids);
 494
 495 static struct platform_driver mt6331_regulator_driver = {
 496         .driver = {
 497                 .name = "mt6331-regulator",
 498                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 499         },
 500         .probe = mt6331_regulator_probe,
 501         .id_table = mt6331_platform_ids,
 502 };
 503
 504 module_platform_driver(mt6331_regulator_driver);
 505
 506 MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
 507 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6331 PMIC");
 508 MODULE_LICENSE("GPL");