drivers/regulator/pf8x00-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 NXP
   4  * Copyright (C) 2019 Boundary Devices
   5  * Copyright (C) 2020 Amarula Solutions(India)
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/err.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/i2c.h>
  12 #include <linux/module.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/machine.h>
  16
  17 /* registers */
  18 #define PF8X00_DEVICEID                 0x00
  19 #define PF8X00_REVID                    0x01
  20 #define PF8X00_EMREV                    0x02
  21 #define PF8X00_PROGID                   0x03
  22 #define PF8X00_IMS_INT                  0x04
  23 #define PF8X00_IMS_THERM                0x07
  24 #define PF8X00_SW_MODE_INT              0x0a
  25 #define PF8X00_SW_MODE_MASK             0x0b
  26 #define PF8X00_IMS_SW_ILIM              0x12
  27 #define PF8X00_IMS_LDO_ILIM             0x15
  28 #define PF8X00_IMS_SW_UV                0x18
  29 #define PF8X00_IMS_SW_OV                0x1b
  30 #define PF8X00_IMS_LDO_UV               0x1e
  31 #define PF8X00_IMS_LDO_OV               0x21
  32 #define PF8X00_IMS_PWRON                0x24
  33 #define PF8X00_SYS_INT                  0x27
  34 #define PF8X00_HARD_FAULT               0x29
  35 #define PF8X00_FSOB_FLAGS               0x2a
  36 #define PF8X00_FSOB_SELECT              0x2b
  37 #define PF8X00_ABIST_OV1                0x2c
  38 #define PF8X00_ABIST_OV2                0x2d
  39 #define PF8X00_ABIST_UV1                0x2e
  40 #define PF8X00_ABIST_UV2                0x2f
  41 #define PF8X00_TEST_FLAGS               0x30
  42 #define PF8X00_ABIST_RUN                0x31
  43 #define PF8X00_RANDOM_GEN               0x33
  44 #define PF8X00_RANDOM_CHK               0x34
  45 #define PF8X00_VMONEN1                  0x35
  46 #define PF8X00_VMONEN2                  0x36
  47 #define PF8X00_CTRL1                    0x37
  48 #define PF8X00_CTRL2                    0x38
  49 #define PF8X00_CTRL3                    0x39
  50 #define PF8X00_PWRUP_CTRL               0x3a
  51 #define PF8X00_RESETBMCU                0x3c
  52 #define PF8X00_PGOOD                    0x3d
  53 #define PF8X00_PWRDN_DLY1               0x3e
  54 #define PF8X00_PWRDN_DLY2               0x3f
  55 #define PF8X00_FREQ_CTRL                0x40
  56 #define PF8X00_COINCELL_CTRL            0x41
  57 #define PF8X00_PWRON                    0x42
  58 #define PF8X00_WD_CONFIG                0x43
  59 #define PF8X00_WD_CLEAR                 0x44
  60 #define PF8X00_WD_EXPIRE                0x45
  61 #define PF8X00_WD_COUNTER               0x46
  62 #define PF8X00_FAULT_COUNTER            0x47
  63 #define PF8X00_FSAFE_COUNTER            0x48
  64 #define PF8X00_FAULT_TIMER              0x49
  65 #define PF8X00_AMUX                     0x4a
  66 #define PF8X00_SW1_CONFIG1              0x4d
  67 #define PF8X00_LDO1_CONFIG1             0x85
  68 #define PF8X00_VSNVS_CONFIG1            0x9d
  69 #define PF8X00_PAGE_SELECT              0x9f
  70
  71 /* regulators */
  72 enum pf8x00_regulators {
  73         PF8X00_LDO1,
  74         PF8X00_LDO2,
  75         PF8X00_LDO3,
  76         PF8X00_LDO4,
  77         PF8X00_BUCK1,
  78         PF8X00_BUCK2,
  79         PF8X00_BUCK3,
  80         PF8X00_BUCK4,
  81         PF8X00_BUCK5,
  82         PF8X00_BUCK6,
  83         PF8X00_BUCK7,
  84         PF8X00_VSNVS,
  85
  86         PF8X00_MAX_REGULATORS,
  87 };
  88
  89 enum pf8x00_buck_states {
  90         SW_CONFIG1,
  91         SW_CONFIG2,
  92         SW_PWRUP,
  93         SW_MODE1,
  94         SW_RUN_VOLT,
  95         SW_STBY_VOLT,
  96 };
  97 #define PF8X00_SW_BASE(i)               (8 * (i - PF8X00_BUCK1) + PF8X00_SW1_CONFIG1)
  98
  99 enum pf8x00_ldo_states {
 100         LDO_CONFIG1,
 101         LDO_CONFIG2,
 102         LDO_PWRUP,
 103         LDO_RUN_VOLT,
 104         LDO_STBY_VOLT,
 105 };
 106 #define PF8X00_LDO_BASE(i)              (6 * (i - PF8X00_LDO1) + PF8X00_LDO1_CONFIG1)
 107
 108 enum swxilim_bits {
 109         SWXILIM_2100_MA,
 110         SWXILIM_2600_MA,
 111         SWXILIM_3000_MA,
 112         SWXILIM_4500_MA,
 113 };
 114 #define PF8X00_SWXILIM_SHIFT            3
 115 #define PF8X00_SWXILIM_MASK             GENMASK(4, 3)
 116 #define PF8X00_SWXPHASE_MASK            GENMASK(2, 0)
 117 #define PF8X00_SWXPHASE_SHIFT           7
 118
 119 enum pf8x00_devid {
 120         PF8100                  = 0x0,
 121         PF8121A                 = BIT(1),
 122         PF8200                  = BIT(3),
 123 };
 124 #define PF8X00_FAM                      BIT(6)
 125 #define PF8X00_DEVICE_FAM_MASK          GENMASK(7, 4)
 126 #define PF8X00_DEVICE_ID_MASK           GENMASK(3, 0)
 127
 128 struct pf8x00_regulator_data {
 129         struct regulator_desc desc;
 130         unsigned int suspend_enable_reg;
 131         unsigned int suspend_enable_mask;
 132         unsigned int suspend_voltage_reg;
 133         unsigned int suspend_voltage_cache;
 134 };
 135
 136 struct pf8x00_chip {
 137         struct regmap *regmap;
 138         struct device *dev;
 139 };
 140
 141 static const struct regmap_config pf8x00_regmap_config = {
 142         .reg_bits = 8,
 143         .val_bits = 8,
 144         .max_register = PF8X00_PAGE_SELECT,
 145         .cache_type = REGCACHE_RBTREE,
 146 };
 147
 148 /* VLDOx output: 1.5V to 5.0V */
 149 static const int pf8x00_ldo_voltages[] = {
 150         1500000, 1600000, 1800000, 1850000, 2150000, 2500000, 2800000, 3000000,
 151         3100000, 3150000, 3200000, 3300000, 3350000, 1650000, 1700000, 5000000,
 152 };
 153
 154 /* Output: 2.1A to 4.5A */
 155 static const unsigned int pf8x00_sw_current_table[] = {
 156         2100000, 2600000, 3000000, 4500000,
 157 };
 158
 159 /* Output: 0.4V to 1.8V */
 160 #define PF8XOO_SW1_6_VOLTAGE_NUM 0xB2
 161 static const struct linear_range pf8x00_sw1_to_6_voltages[] = {
 162         REGULATOR_LINEAR_RANGE(400000, 0x00, 0xB0, 6250),
 163         REGULATOR_LINEAR_RANGE(1800000, 0xB1, 0xB1, 0),
 164 };
 165
 166 /* Output: 1.0V to 4.1V */
 167 static const int pf8x00_sw7_voltages[] = {
 168         1000000, 1100000, 1200000, 1250000, 1300000, 1350000, 1500000, 1600000,
 169         1800000, 1850000, 2000000, 2100000, 2150000, 2250000, 2300000, 2400000,
 170         2500000, 2800000, 3150000, 3200000, 3250000, 3300000, 3350000, 3400000,
 171         3500000, 3800000, 4000000, 4100000, 4100000, 4100000, 4100000, 4100000,
 172 };
 173
 174 /* Output: 1.8V, 3.0V, or 3.3V */
 175 static const int pf8x00_vsnvs_voltages[] = {
 176         0, 1800000, 3000000, 3300000,
 177 };
 178
 179 static void swxilim_select(struct pf8x00_chip *chip, int id, int ilim)
 180 {
 181         u8 ilim_sel;
 182         u8 reg = PF8X00_SW_BASE(id) + SW_CONFIG2;
 183
 184         switch (ilim) {
 185         case 2100:
 186                 ilim_sel = SWXILIM_2100_MA;
 187                 break;
 188         case 2600:
 189                 ilim_sel = SWXILIM_2600_MA;
 190                 break;
 191         case 3000:
 192                 ilim_sel = SWXILIM_3000_MA;
 193                 break;
 194         case 4500:
 195                 ilim_sel = SWXILIM_4500_MA;
 196                 break;
 197         default:
 198                 ilim_sel = SWXILIM_2100_MA;
 199                 break;
 200         }
 201
 202         regmap_update_bits(chip->regmap, reg,
 203                                         PF8X00_SWXILIM_MASK,
 204                                         ilim_sel << PF8X00_SWXILIM_SHIFT);
 205 }
 206
 207 static void handle_ilim_property(struct device_node *np,
 208                               const struct regulator_desc *desc,
 209                               struct regulator_config *config)
 210 {
 211         struct pf8x00_chip *chip = config->driver_data;
 212         int ret;
 213         int val;
 214
 215         if ((desc->id >= PF8X00_BUCK1) && (desc->id <= PF8X00_BUCK7)) {
 216                 ret = of_property_read_u32(np, "nxp,ilim-ma", &val);
 217                 if (ret) {
 218                         dev_dbg(chip->dev, "unspecified ilim for BUCK%d, use value stored in OTP\n",
 219                                 desc->id - PF8X00_LDO4);
 220                         return;
 221                 }
 222
 223                 dev_warn(chip->dev, "nxp,ilim-ma is deprecated, please use regulator-max-microamp\n");
 224                 swxilim_select(chip, desc->id, val);
 225
 226         } else
 227                 dev_warn(chip->dev, "nxp,ilim-ma used with incorrect regulator (%d)\n", desc->id);
 228 }
 229
 230 static void handle_shift_property(struct device_node *np,
 231                               const struct regulator_desc *desc,
 232                               struct regulator_config *config)
 233 {
 234         unsigned char id = desc->id - PF8X00_LDO4;
 235         unsigned char reg = PF8X00_SW_BASE(id) + SW_CONFIG2;
 236         struct pf8x00_chip *chip = config->driver_data;
 237
 238         int phase;
 239         int val;
 240         int ret;
 241         if ((desc->id >= PF8X00_BUCK1) && (desc->id <= PF8X00_BUCK7)) {
 242                 ret = of_property_read_u32(np, "nxp,phase-shift", &val);
 243                 if (ret) {
 244                         dev_dbg(chip->dev,
 245                                 "unspecified phase-shift for BUCK%d, using OTP configuration\n",
 246                                 id);
 247                         return;
 248                 }
 249
 250                 if (val < 0 || val > 315 || val % 45 != 0) {
 251                         dev_warn(config->dev,
 252                                 "invalid phase_shift %d for BUCK%d, using OTP configuration\n",
 253                                 val, id);
 254                         return;
 255                 }
 256
 257                 phase = val / 45;
 258
 259                 if (phase >= 1)
 260                         phase -= 1;
 261                 else
 262                         phase = PF8X00_SWXPHASE_SHIFT;
 263
 264                 regmap_update_bits(chip->regmap, reg,
 265                                 PF8X00_SWXPHASE_MASK,
 266                                 phase);
 267         } else
 268                 dev_warn(chip->dev, "nxp,phase-shift used with incorrect regulator (%d)\n", id);
 269
 270 }
 271
 272 static int pf8x00_of_parse_cb(struct device_node *np,
 273                               const struct regulator_desc *desc,
 274                               struct regulator_config *config)
 275 {
 276
 277         handle_ilim_property(np, desc, config);
 278         handle_shift_property(np, desc, config);
 279
 280         return 0;
 281 }
 282
 283 static int pf8x00_suspend_enable(struct regulator_dev *rdev)
 284 {
 285         struct pf8x00_regulator_data *regl = rdev_get_drvdata(rdev);
 286         struct regmap *rmap = rdev_get_regmap(rdev);
 287
 288         return regmap_update_bits(rmap, regl->suspend_enable_reg,
 289                                   regl->suspend_enable_mask,
 290                                   regl->suspend_enable_mask);
 291 }
 292
 293 static int pf8x00_suspend_disable(struct regulator_dev *rdev)
 294 {
 295         struct pf8x00_regulator_data *regl = rdev_get_drvdata(rdev);
 296         struct regmap *rmap = rdev_get_regmap(rdev);
 297
 298         return regmap_update_bits(rmap, regl->suspend_enable_reg,
 299                                   regl->suspend_enable_mask, 0);
 300 }
 301
 302 static int pf8x00_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 303 {
 304         struct pf8x00_regulator_data *regl = rdev_get_drvdata(rdev);
 305         int ret;
 306
 307         if (regl->suspend_voltage_cache == uV)
 308                 return 0;
 309
 310         ret = regulator_map_voltage_iterate(rdev, uV, uV);
 311         if (ret < 0) {
 312                 dev_err(rdev_get_dev(rdev), "failed to map %i uV\n", uV);
 313                 return ret;
 314         }
 315
 316         dev_dbg(rdev_get_dev(rdev), "uV: %i, reg: 0x%x, msk: 0x%x, val: 0x%x\n",
 317                 uV, regl->suspend_voltage_reg, regl->desc.vsel_mask, ret);
 318         ret = regmap_update_bits(rdev->regmap, regl->suspend_voltage_reg,
 319                                  regl->desc.vsel_mask, ret);
 320         if (ret < 0) {
 321                 dev_err(rdev_get_dev(rdev), "failed to set %i uV\n", uV);
 322                 return ret;
 323         }
 324
 325         regl->suspend_voltage_cache = uV;
 326
 327         return 0;
 328 }
 329
 330 static const struct regulator_ops pf8x00_ldo_ops = {
 331         .enable = regulator_enable_regmap,
 332         .disable = regulator_disable_regmap,
 333         .is_enabled = regulator_is_enabled_regmap,
 334         .list_voltage = regulator_list_voltage_table,
 335         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 336         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 337         .set_suspend_enable = pf8x00_suspend_enable,
 338         .set_suspend_disable = pf8x00_suspend_disable,
 339         .set_suspend_voltage = pf8x00_set_suspend_voltage,
 340 };
 341
 342
 343 static const struct regulator_ops pf8x00_buck1_6_ops = {
 344         .enable = regulator_enable_regmap,
 345         .disable = regulator_disable_regmap,
 346         .is_enabled = regulator_is_enabled_regmap,
 347         .list_voltage = regulator_list_voltage_linear_range,
 348         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 349         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 350         .get_current_limit = regulator_get_current_limit_regmap,
 351         .set_current_limit = regulator_set_current_limit_regmap,
 352         .set_suspend_enable = pf8x00_suspend_enable,
 353         .set_suspend_disable = pf8x00_suspend_disable,
 354         .set_suspend_voltage = pf8x00_set_suspend_voltage,
 355 };
 356
 357 static const struct regulator_ops pf8x00_buck7_ops = {
 358         .enable = regulator_enable_regmap,
 359         .disable = regulator_disable_regmap,
 360         .is_enabled = regulator_is_enabled_regmap,
 361         .list_voltage = regulator_list_voltage_table,
 362         .map_voltage = regulator_map_voltage_ascend,
 363         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 364         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 365         .get_current_limit = regulator_get_current_limit_regmap,
 366         .set_current_limit = regulator_set_current_limit_regmap,
 367         .set_suspend_enable = pf8x00_suspend_enable,
 368         .set_suspend_disable = pf8x00_suspend_disable,
 369 };
 370
 371 static const struct regulator_ops pf8x00_vsnvs_ops = {
 372         .enable = regulator_enable_regmap,
 373         .disable = regulator_disable_regmap,
 374         .is_enabled = regulator_is_enabled_regmap,
 375         .list_voltage = regulator_list_voltage_table,
 376         .map_voltage = regulator_map_voltage_ascend,
 377         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 378         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 379 };
 380
 381 #define PF8X00LDO(_id, _name, base, voltages)                   \
 382         [PF8X00_LDO ## _id] = {                                 \
 383                 .desc = {                                       \
 384                         .name = _name,                          \
 385                         .of_match = _name,                      \
 386                         .regulators_node = "regulators",        \
 387                         .n_voltages = ARRAY_SIZE(voltages),     \
 388                         .ops = &pf8x00_ldo_ops,                 \
 389                         .type = REGULATOR_VOLTAGE,              \
 390                         .id = PF8X00_LDO ## _id,                \
 391                         .owner = THIS_MODULE,                   \
 392                         .volt_table = voltages,                 \
 393                         .vsel_reg = (base) + LDO_RUN_VOLT,      \
 394                         .vsel_mask = 0xff,                      \
 395                         .enable_reg = (base) + LDO_CONFIG2,     \
 396                         .enable_val = 0x2,                      \
 397                         .disable_val = 0x0,                     \
 398                         .enable_mask = 2,                       \
 399                 },                                              \
 400                 .suspend_enable_reg = (base) + LDO_CONFIG2,     \
 401                 .suspend_enable_mask = 1,                       \
 402                 .suspend_voltage_reg = (base) + LDO_STBY_VOLT,  \
 403         }
 404
 405 #define PF8X00BUCK(_id, _name, base, voltages)                  \
 406         [PF8X00_BUCK ## _id] = {                                \
 407                 .desc = {                                       \
 408                         .name = _name,                          \
 409                         .of_match = _name,                      \
 410                         .regulators_node = "regulators",        \
 411                         .of_parse_cb = pf8x00_of_parse_cb,      \
 412                         .n_voltages = PF8XOO_SW1_6_VOLTAGE_NUM, \
 413                         .ops = &pf8x00_buck1_6_ops,             \
 414                         .type = REGULATOR_VOLTAGE,              \
 415                         .id = PF8X00_BUCK ## _id,               \
 416                         .owner = THIS_MODULE,                   \
 417                         .ramp_delay = 19000,                    \
 418                         .linear_ranges = pf8x00_sw1_to_6_voltages, \
 419                         .n_linear_ranges = \
 420                                 ARRAY_SIZE(pf8x00_sw1_to_6_voltages), \
 421                         .vsel_reg = (base) + SW_RUN_VOLT,       \
 422                         .vsel_mask = 0xff,                      \
 423                         .curr_table = pf8x00_sw_current_table, \
 424                         .n_current_limits = \
 425                                 ARRAY_SIZE(pf8x00_sw_current_table), \
 426                         .csel_reg = (base) + SW_CONFIG2,        \
 427                         .csel_mask = PF8X00_SWXILIM_MASK,       \
 428                         .enable_reg = (base) + SW_MODE1,        \
 429                         .enable_val = 0x3,                      \
 430                         .disable_val = 0x0,                     \
 431                         .enable_mask = 0x3,                     \
 432                         .enable_time = 500,                     \
 433                 },                                              \
 434                 .suspend_enable_reg = (base) + SW_MODE1,        \
 435                 .suspend_enable_mask = 0xc,                     \
 436                 .suspend_voltage_reg = (base) + SW_STBY_VOLT,   \
 437         }
 438
 439 #define PF8X00BUCK7(_name, base, voltages)                      \
 440         [PF8X00_BUCK7] = {                              \
 441                 .desc = {                                       \
 442                         .name = _name,                          \
 443                         .of_match = _name,                      \
 444                         .regulators_node = "regulators",        \
 445                         .of_parse_cb = pf8x00_of_parse_cb,      \
 446                         .n_voltages = ARRAY_SIZE(voltages),     \
 447                         .ops = &pf8x00_buck7_ops,               \
 448                         .type = REGULATOR_VOLTAGE,              \
 449                         .id = PF8X00_BUCK7,             \
 450                         .owner = THIS_MODULE,                   \
 451                         .ramp_delay = 19000,                    \
 452                         .volt_table = voltages,                 \
 453                         .vsel_reg = (base) + SW_RUN_VOLT,       \
 454                         .vsel_mask = 0xff,                      \
 455                         .curr_table = pf8x00_sw_current_table, \
 456                         .n_current_limits = \
 457                                 ARRAY_SIZE(pf8x00_sw_current_table), \
 458                         .csel_reg = (base) + SW_CONFIG2,        \
 459                         .csel_mask = PF8X00_SWXILIM_MASK,       \
 460                         .enable_reg = (base) + SW_MODE1,        \
 461                         .enable_val = 0x3,                      \
 462                         .disable_val = 0x0,                     \
 463                         .enable_mask = 0x3,                     \
 464                         .enable_time = 500,                     \
 465                 },                                              \
 466         }
 467
 468
 469 #define PF8X00VSNVS(_name, base, voltages)                      \
 470         [PF8X00_VSNVS] = {                                      \
 471                 .desc = {                                       \
 472                         .name = _name,                          \
 473                         .of_match = _name,                      \
 474                         .regulators_node = "regulators",        \
 475                         .n_voltages = ARRAY_SIZE(voltages),     \
 476                         .ops = &pf8x00_vsnvs_ops,               \
 477                         .type = REGULATOR_VOLTAGE,              \
 478                         .id = PF8X00_VSNVS,                     \
 479                         .owner = THIS_MODULE,                   \
 480                         .volt_table = voltages,                 \
 481                         .vsel_reg = (base),                     \
 482                         .vsel_mask = 0x3,                       \
 483                 },                                              \
 484         }
 485
 486 static struct pf8x00_regulator_data pf8x00_regs_data[PF8X00_MAX_REGULATORS] = {
 487         PF8X00LDO(1, "ldo1", PF8X00_LDO_BASE(PF8X00_LDO1), pf8x00_ldo_voltages),
 488         PF8X00LDO(2, "ldo2", PF8X00_LDO_BASE(PF8X00_LDO2), pf8x00_ldo_voltages),
 489         PF8X00LDO(3, "ldo3", PF8X00_LDO_BASE(PF8X00_LDO3), pf8x00_ldo_voltages),
 490         PF8X00LDO(4, "ldo4", PF8X00_LDO_BASE(PF8X00_LDO4), pf8x00_ldo_voltages),
 491         PF8X00BUCK(1, "buck1", PF8X00_SW_BASE(PF8X00_BUCK1), pf8x00_sw1_to_6_voltages),
 492         PF8X00BUCK(2, "buck2", PF8X00_SW_BASE(PF8X00_BUCK2), pf8x00_sw1_to_6_voltages),
 493         PF8X00BUCK(3, "buck3", PF8X00_SW_BASE(PF8X00_BUCK3), pf8x00_sw1_to_6_voltages),
 494         PF8X00BUCK(4, "buck4", PF8X00_SW_BASE(PF8X00_BUCK4), pf8x00_sw1_to_6_voltages),
 495         PF8X00BUCK(5, "buck5", PF8X00_SW_BASE(PF8X00_BUCK5), pf8x00_sw1_to_6_voltages),
 496         PF8X00BUCK(6, "buck6", PF8X00_SW_BASE(PF8X00_BUCK6), pf8x00_sw1_to_6_voltages),
 497         PF8X00BUCK7("buck7", PF8X00_SW_BASE(PF8X00_BUCK7), pf8x00_sw7_voltages),
 498         PF8X00VSNVS("vsnvs", PF8X00_VSNVS_CONFIG1, pf8x00_vsnvs_voltages),
 499 };
 500
 501 static int pf8x00_identify(struct pf8x00_chip *chip)
 502 {
 503         unsigned int value;
 504         u8 dev_fam, dev_id;
 505         const char *name = NULL;
 506         int ret;
 507
 508         ret = regmap_read(chip->regmap, PF8X00_DEVICEID, &value);
 509         if (ret) {
 510                 dev_err(chip->dev, "failed to read chip family\n");
 511                 return ret;
 512         }
 513
 514         dev_fam = value & PF8X00_DEVICE_FAM_MASK;
 515         switch (dev_fam) {
 516         case PF8X00_FAM:
 517                 break;
 518         default:
 519                 dev_err(chip->dev,
 520                         "Chip 0x%x is not from PF8X00 family\n", dev_fam);
 521                 return ret;
 522         }
 523
 524         dev_id = value & PF8X00_DEVICE_ID_MASK;
 525         switch (dev_id) {
 526         case PF8100:
 527                 name = "PF8100";
 528                 break;
 529         case PF8121A:
 530                 name = "PF8121A";
 531                 break;
 532         case PF8200:
 533                 name = "PF8200";
 534                 break;
 535         default:
 536                 dev_err(chip->dev, "Unknown pf8x00 device id 0x%x\n", dev_id);
 537                 return -ENODEV;
 538         }
 539
 540         dev_info(chip->dev, "%s PMIC found.\n", name);
 541
 542         return 0;
 543 }
 544
 545 static int pf8x00_i2c_probe(struct i2c_client *client)
 546 {
 547         struct regulator_config config = { NULL, };
 548         struct pf8x00_chip *chip;
 549         int id;
 550         int ret;
 551
 552         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 553         if (!chip)
 554                 return -ENOMEM;
 555
 556         i2c_set_clientdata(client, chip);
 557         chip->dev = &client->dev;
 558
 559         chip->regmap = devm_regmap_init_i2c(client, &pf8x00_regmap_config);
 560         if (IS_ERR(chip->regmap)) {
 561                 ret = PTR_ERR(chip->regmap);
 562                 dev_err(&client->dev,
 563                         "regmap allocation failed with err %d\n", ret);
 564                 return ret;
 565         }
 566
 567         ret = pf8x00_identify(chip);
 568         if (ret)
 569                 return ret;
 570
 571         for (id = 0; id < ARRAY_SIZE(pf8x00_regs_data); id++) {
 572                 struct pf8x00_regulator_data *data = &pf8x00_regs_data[id];
 573                 struct regulator_dev *rdev;
 574
 575                 config.dev = chip->dev;
 576                 config.driver_data = data;
 577                 config.regmap = chip->regmap;
 578
 579                 rdev = devm_regulator_register(&client->dev, &data->desc, &config);
 580                 if (IS_ERR(rdev)) {
 581                         dev_err(&client->dev,
 582                                 "failed to register %s regulator\n", data->desc.name);
 583                         return PTR_ERR(rdev);
 584                 }
 585         }
 586
 587         return 0;
 588 }
 589
 590 static const struct of_device_id pf8x00_dt_ids[] = {
 591         { .compatible = "nxp,pf8100",},
 592         { .compatible = "nxp,pf8121a",},
 593         { .compatible = "nxp,pf8200",},
 594         { }
 595 };
 596 MODULE_DEVICE_TABLE(of, pf8x00_dt_ids);
 597
 598 static const struct i2c_device_id pf8x00_i2c_id[] = {
 599         { "pf8100", 0 },
 600         { "pf8121a", 0 },
 601         { "pf8200", 0 },
 602         {},
 603 };
 604 MODULE_DEVICE_TABLE(i2c, pf8x00_i2c_id);
 605
 606 static struct i2c_driver pf8x00_regulator_driver = {
 607         .id_table = pf8x00_i2c_id,
 608         .driver = {
 609                 .name = "pf8x00",
 610                 .of_match_table = pf8x00_dt_ids,
 611         },
 612         .probe_new = pf8x00_i2c_probe,
 613 };
 614 module_i2c_driver(pf8x00_regulator_driver);
 615
 616 MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
 617 MODULE_AUTHOR("Troy Kisky <troy.kisky@boundarydevices.com>");
 618 MODULE_DESCRIPTION("Regulator Driver for NXP's PF8100/PF8121A/PF8200 PMIC");
 619 MODULE_LICENSE("GPL v2");