drivers/regulator/mt6360-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // Copyright (C) 2020 MediaTek Inc.
   4 //
   5 // Author: Gene Chen <gene_chen@richtek.com>
   6
   7 #include <linux/init.h>
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/machine.h>
  15
  16 #include <dt-bindings/regulator/mediatek,mt6360-regulator.h>
  17
  18 enum {
  19         MT6360_REGULATOR_BUCK1 = 0,
  20         MT6360_REGULATOR_BUCK2,
  21         MT6360_REGULATOR_LDO6,
  22         MT6360_REGULATOR_LDO7,
  23         MT6360_REGULATOR_LDO1,
  24         MT6360_REGULATOR_LDO2,
  25         MT6360_REGULATOR_LDO3,
  26         MT6360_REGULATOR_LDO5,
  27         MT6360_REGULATOR_MAX,
  28 };
  29
  30 struct mt6360_irq_mapping {
  31         const char *name;
  32         irq_handler_t handler;
  33 };
  34
  35 struct mt6360_regulator_desc {
  36         const struct regulator_desc desc;
  37         unsigned int mode_reg;
  38         unsigned int mode_mask;
  39         unsigned int state_reg;
  40         unsigned int state_mask;
  41         const struct mt6360_irq_mapping *irq_tables;
  42         int irq_table_size;
  43 };
  44
  45 struct mt6360_regulator_data {
  46         struct device *dev;
  47         struct regmap *regmap;
  48 };
  49
  50 static irqreturn_t mt6360_pgb_event_handler(int irq, void *data)
  51 {
  52         struct regulator_dev *rdev = data;
  53
  54         regulator_notifier_call_chain(rdev, REGULATOR_EVENT_FAIL, NULL);
  55         return IRQ_HANDLED;
  56 }
  57
  58 static irqreturn_t mt6360_oc_event_handler(int irq, void *data)
  59 {
  60         struct regulator_dev *rdev = data;
  61
  62         regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_CURRENT, NULL);
  63         return IRQ_HANDLED;
  64 }
  65
  66 static irqreturn_t mt6360_ov_event_handler(int irq, void *data)
  67 {
  68         struct regulator_dev *rdev = data;
  69
  70         regulator_notifier_call_chain(rdev, REGULATOR_EVENT_REGULATION_OUT, NULL);
  71         return IRQ_HANDLED;
  72 }
  73
  74 static irqreturn_t mt6360_uv_event_handler(int irq, void *data)
  75 {
  76         struct regulator_dev *rdev = data;
  77
  78         regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE, NULL);
  79         return IRQ_HANDLED;
  80 }
  81
  82 static const struct mt6360_irq_mapping buck1_irq_tbls[] = {
  83         { "buck1_pgb_evt", mt6360_pgb_event_handler },
  84         { "buck1_oc_evt", mt6360_oc_event_handler },
  85         { "buck1_ov_evt", mt6360_ov_event_handler },
  86         { "buck1_uv_evt", mt6360_uv_event_handler },
  87 };
  88
  89 static const struct mt6360_irq_mapping buck2_irq_tbls[] = {
  90         { "buck2_pgb_evt", mt6360_pgb_event_handler },
  91         { "buck2_oc_evt", mt6360_oc_event_handler },
  92         { "buck2_ov_evt", mt6360_ov_event_handler },
  93         { "buck2_uv_evt", mt6360_uv_event_handler },
  94 };
  95
  96 static const struct mt6360_irq_mapping ldo6_irq_tbls[] = {
  97         { "ldo6_pgb_evt", mt6360_pgb_event_handler },
  98         { "ldo6_oc_evt", mt6360_oc_event_handler },
  99 };
 100
 101 static const struct mt6360_irq_mapping ldo7_irq_tbls[] = {
 102         { "ldo7_pgb_evt", mt6360_pgb_event_handler },
 103         { "ldo7_oc_evt", mt6360_oc_event_handler },
 104 };
 105
 106 static const struct mt6360_irq_mapping ldo1_irq_tbls[] = {
 107         { "ldo1_pgb_evt", mt6360_pgb_event_handler },
 108         { "ldo1_oc_evt", mt6360_oc_event_handler },
 109 };
 110
 111 static const struct mt6360_irq_mapping ldo2_irq_tbls[] = {
 112         { "ldo2_pgb_evt", mt6360_pgb_event_handler },
 113         { "ldo2_oc_evt", mt6360_oc_event_handler },
 114 };
 115
 116 static const struct mt6360_irq_mapping ldo3_irq_tbls[] = {
 117         { "ldo3_pgb_evt", mt6360_pgb_event_handler },
 118         { "ldo3_oc_evt", mt6360_oc_event_handler },
 119 };
 120
 121 static const struct mt6360_irq_mapping ldo5_irq_tbls[] = {
 122         { "ldo5_pgb_evt", mt6360_pgb_event_handler },
 123         { "ldo5_oc_evt", mt6360_oc_event_handler },
 124 };
 125
 126 static const struct linear_range buck_vout_ranges[] = {
 127         REGULATOR_LINEAR_RANGE(300000, 0x00, 0xc7, 5000),
 128         REGULATOR_LINEAR_RANGE(1300000, 0xc8, 0xff, 0),
 129 };
 130
 131 static const struct linear_range ldo_vout_ranges1[] = {
 132         REGULATOR_LINEAR_RANGE(500000, 0x00, 0x09, 10000),
 133         REGULATOR_LINEAR_RANGE(600000, 0x0a, 0x10, 0),
 134         REGULATOR_LINEAR_RANGE(610000, 0x11, 0x19, 10000),
 135         REGULATOR_LINEAR_RANGE(700000, 0x1a, 0x20, 0),
 136         REGULATOR_LINEAR_RANGE(710000, 0x21, 0x29, 10000),
 137         REGULATOR_LINEAR_RANGE(800000, 0x2a, 0x30, 0),
 138         REGULATOR_LINEAR_RANGE(810000, 0x31, 0x39, 10000),
 139         REGULATOR_LINEAR_RANGE(900000, 0x3a, 0x40, 0),
 140         REGULATOR_LINEAR_RANGE(910000, 0x41, 0x49, 10000),
 141         REGULATOR_LINEAR_RANGE(1000000, 0x4a, 0x50, 0),
 142         REGULATOR_LINEAR_RANGE(1010000, 0x51, 0x59, 10000),
 143         REGULATOR_LINEAR_RANGE(1100000, 0x5a, 0x60, 0),
 144         REGULATOR_LINEAR_RANGE(1110000, 0x61, 0x69, 10000),
 145         REGULATOR_LINEAR_RANGE(1200000, 0x6a, 0x70, 0),
 146         REGULATOR_LINEAR_RANGE(1210000, 0x71, 0x79, 10000),
 147         REGULATOR_LINEAR_RANGE(1300000, 0x7a, 0x80, 0),
 148         REGULATOR_LINEAR_RANGE(1310000, 0x81, 0x89, 10000),
 149         REGULATOR_LINEAR_RANGE(1400000, 0x8a, 0x90, 0),
 150         REGULATOR_LINEAR_RANGE(1410000, 0x91, 0x99, 10000),
 151         REGULATOR_LINEAR_RANGE(1500000, 0x9a, 0xa0, 0),
 152         REGULATOR_LINEAR_RANGE(1510000, 0xa1, 0xa9, 10000),
 153         REGULATOR_LINEAR_RANGE(1600000, 0xaa, 0xb0, 0),
 154         REGULATOR_LINEAR_RANGE(1610000, 0xb1, 0xb9, 10000),
 155         REGULATOR_LINEAR_RANGE(1700000, 0xba, 0xc0, 0),
 156         REGULATOR_LINEAR_RANGE(1710000, 0xc1, 0xc9, 10000),
 157         REGULATOR_LINEAR_RANGE(1800000, 0xca, 0xd0, 0),
 158         REGULATOR_LINEAR_RANGE(1810000, 0xd1, 0xd9, 10000),
 159         REGULATOR_LINEAR_RANGE(1900000, 0xda, 0xe0, 0),
 160         REGULATOR_LINEAR_RANGE(1910000, 0xe1, 0xe9, 10000),
 161         REGULATOR_LINEAR_RANGE(2000000, 0xea, 0xf0, 0),
 162         REGULATOR_LINEAR_RANGE(2010000, 0xf1, 0xf9, 10000),
 163         REGULATOR_LINEAR_RANGE(2100000, 0xfa, 0xff, 0),
 164 };
 165
 166 static const struct linear_range ldo_vout_ranges2[] = {
 167         REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x09, 10000),
 168         REGULATOR_LINEAR_RANGE(1300000, 0x0a, 0x10, 0),
 169         REGULATOR_LINEAR_RANGE(1310000, 0x11, 0x19, 10000),
 170         REGULATOR_LINEAR_RANGE(1400000, 0x1a, 0x1f, 0),
 171         REGULATOR_LINEAR_RANGE(1500000, 0x20, 0x29, 10000),
 172         REGULATOR_LINEAR_RANGE(1600000, 0x2a, 0x2f, 0),
 173         REGULATOR_LINEAR_RANGE(1700000, 0x30, 0x39, 10000),
 174         REGULATOR_LINEAR_RANGE(1800000, 0x3a, 0x40, 0),
 175         REGULATOR_LINEAR_RANGE(1810000, 0x41, 0x49, 10000),
 176         REGULATOR_LINEAR_RANGE(1900000, 0x4a, 0x4f, 0),
 177         REGULATOR_LINEAR_RANGE(2000000, 0x50, 0x59, 10000),
 178         REGULATOR_LINEAR_RANGE(2100000, 0x5a, 0x60, 0),
 179         REGULATOR_LINEAR_RANGE(2110000, 0x61, 0x69, 10000),
 180         REGULATOR_LINEAR_RANGE(2200000, 0x6a, 0x6f, 0),
 181         REGULATOR_LINEAR_RANGE(2500000, 0x70, 0x79, 10000),
 182         REGULATOR_LINEAR_RANGE(2600000, 0x7a, 0x7f, 0),
 183         REGULATOR_LINEAR_RANGE(2700000, 0x80, 0x89, 10000),
 184         REGULATOR_LINEAR_RANGE(2800000, 0x8a, 0x90, 0),
 185         REGULATOR_LINEAR_RANGE(2810000, 0x91, 0x99, 10000),
 186         REGULATOR_LINEAR_RANGE(2900000, 0x9a, 0xa0, 0),
 187         REGULATOR_LINEAR_RANGE(2910000, 0xa1, 0xa9, 10000),
 188         REGULATOR_LINEAR_RANGE(3000000, 0xaa, 0xb0, 0),
 189         REGULATOR_LINEAR_RANGE(3010000, 0xb1, 0xb9, 10000),
 190         REGULATOR_LINEAR_RANGE(3100000, 0xba, 0xc0, 0),
 191         REGULATOR_LINEAR_RANGE(3110000, 0xc1, 0xc9, 10000),
 192         REGULATOR_LINEAR_RANGE(3200000, 0xca, 0xcf, 0),
 193         REGULATOR_LINEAR_RANGE(3300000, 0xd0, 0xd9, 10000),
 194         REGULATOR_LINEAR_RANGE(3400000, 0xda, 0xe0, 0),
 195         REGULATOR_LINEAR_RANGE(3410000, 0xe1, 0xe9, 10000),
 196         REGULATOR_LINEAR_RANGE(3500000, 0xea, 0xf0, 0),
 197         REGULATOR_LINEAR_RANGE(3510000, 0xf1, 0xf9, 10000),
 198         REGULATOR_LINEAR_RANGE(3600000, 0xfa, 0xff, 0),
 199 };
 200
 201 static const struct linear_range ldo_vout_ranges3[] = {
 202         REGULATOR_LINEAR_RANGE(2700000, 0x00, 0x09, 10000),
 203         REGULATOR_LINEAR_RANGE(2800000, 0x0a, 0x10, 0),
 204         REGULATOR_LINEAR_RANGE(2810000, 0x11, 0x19, 10000),
 205         REGULATOR_LINEAR_RANGE(2900000, 0x1a, 0x20, 0),
 206         REGULATOR_LINEAR_RANGE(2910000, 0x21, 0x29, 10000),
 207         REGULATOR_LINEAR_RANGE(3000000, 0x2a, 0x30, 0),
 208         REGULATOR_LINEAR_RANGE(3010000, 0x31, 0x39, 10000),
 209         REGULATOR_LINEAR_RANGE(3100000, 0x3a, 0x40, 0),
 210         REGULATOR_LINEAR_RANGE(3110000, 0x41, 0x49, 10000),
 211         REGULATOR_LINEAR_RANGE(3200000, 0x4a, 0x4f, 0),
 212         REGULATOR_LINEAR_RANGE(3300000, 0x50, 0x59, 10000),
 213         REGULATOR_LINEAR_RANGE(3400000, 0x5a, 0x60, 0),
 214         REGULATOR_LINEAR_RANGE(3410000, 0x61, 0x69, 10000),
 215         REGULATOR_LINEAR_RANGE(3500000, 0x6a, 0x70, 0),
 216         REGULATOR_LINEAR_RANGE(3510000, 0x71, 0x79, 10000),
 217         REGULATOR_LINEAR_RANGE(3600000, 0x7a, 0x7f, 0),
 218 };
 219
 220 static int mt6360_regulator_set_mode(struct regulator_dev *rdev,
 221                                      unsigned int mode)
 222 {
 223         const struct mt6360_regulator_desc *rdesc = (struct mt6360_regulator_desc *)rdev->desc;
 224         struct regmap *regmap = rdev_get_regmap(rdev);
 225         int shift = ffs(rdesc->mode_mask) - 1;
 226         unsigned int val;
 227         int ret;
 228
 229         switch (mode) {
 230         case REGULATOR_MODE_NORMAL:
 231                 val = MT6360_OPMODE_NORMAL;
 232                 break;
 233         case REGULATOR_MODE_STANDBY:
 234                 val = MT6360_OPMODE_ULP;
 235                 break;
 236         case REGULATOR_MODE_IDLE:
 237                 val = MT6360_OPMODE_LP;
 238                 break;
 239         default:
 240                 return -EINVAL;
 241         }
 242
 243         ret = regmap_update_bits(regmap, rdesc->mode_reg, rdesc->mode_mask, val << shift);
 244         if (ret) {
 245                 dev_err(&rdev->dev, "%s: fail (%d)\n", __func__, ret);
 246                 return ret;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static unsigned int mt6360_regulator_get_mode(struct regulator_dev *rdev)
 253 {
 254         const struct mt6360_regulator_desc *rdesc = (struct mt6360_regulator_desc *)rdev->desc;
 255         struct regmap *regmap = rdev_get_regmap(rdev);
 256         int shift = ffs(rdesc->mode_mask) - 1;
 257         unsigned int val;
 258         int ret;
 259
 260         ret = regmap_read(regmap, rdesc->mode_reg, &val);
 261         if (ret)
 262                 return ret;
 263
 264         val &= rdesc->mode_mask;
 265         val >>= shift;
 266
 267         switch (val) {
 268         case MT6360_OPMODE_LP:
 269                 return REGULATOR_MODE_IDLE;
 270         case MT6360_OPMODE_ULP:
 271                 return REGULATOR_MODE_STANDBY;
 272         case MT6360_OPMODE_NORMAL:
 273                 return REGULATOR_MODE_NORMAL;
 274         default:
 275                 return -EINVAL;
 276         }
 277 }
 278
 279 static int mt6360_regulator_get_status(struct regulator_dev *rdev)
 280 {
 281         const struct mt6360_regulator_desc *rdesc = (struct mt6360_regulator_desc *)rdev->desc;
 282         struct regmap *regmap = rdev_get_regmap(rdev);
 283         unsigned int val;
 284         int ret;
 285
 286         ret = regmap_read(regmap, rdesc->state_reg, &val);
 287         if (ret)
 288                 return ret;
 289
 290         if (val & rdesc->state_mask)
 291                 return REGULATOR_STATUS_ON;
 292
 293         return REGULATOR_STATUS_OFF;
 294 }
 295
 296 static const struct regulator_ops mt6360_regulator_ops = {
 297         .list_voltage = regulator_list_voltage_linear_range,
 298         .enable = regulator_enable_regmap,
 299         .disable = regulator_disable_regmap,
 300         .is_enabled = regulator_is_enabled_regmap,
 301         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 302         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 303         .set_mode = mt6360_regulator_set_mode,
 304         .get_mode = mt6360_regulator_get_mode,
 305         .get_status = mt6360_regulator_get_status,
 306 };
 307
 308 static unsigned int mt6360_regulator_of_map_mode(unsigned int hw_mode)
 309 {
 310         switch (hw_mode) {
 311         case MT6360_OPMODE_NORMAL:
 312                 return REGULATOR_MODE_NORMAL;
 313         case MT6360_OPMODE_LP:
 314                 return REGULATOR_MODE_IDLE;
 315         case MT6360_OPMODE_ULP:
 316                 return REGULATOR_MODE_STANDBY;
 317         default:
 318                 return REGULATOR_MODE_INVALID;
 319         }
 320 }
 321
 322 #define MT6360_REGULATOR_DESC(_name, _sname, ereg, emask, vreg, vmask,  \
 323                               mreg, mmask, streg, stmask, vranges,      \
 324                               vcnts, offon_delay, irq_tbls)             \
 325 {                                                                       \
 326         .desc = {                                                       \
 327                 .name = #_name,                                         \
 328                 .supply_name = #_sname,                                 \
 329                 .id =  MT6360_REGULATOR_##_name,                        \
 330                 .of_match = of_match_ptr(#_name),                       \
 331                 .regulators_node = of_match_ptr("regulator"),           \
 332                 .of_map_mode = mt6360_regulator_of_map_mode,            \
 333                 .owner = THIS_MODULE,                                   \
 334                 .ops = &mt6360_regulator_ops,                           \
 335                 .type = REGULATOR_VOLTAGE,                              \
 336                 .vsel_reg = vreg,                                       \
 337                 .vsel_mask = vmask,                                     \
 338                 .enable_reg = ereg,                                     \
 339                 .enable_mask = emask,                                   \
 340                 .linear_ranges = vranges,                               \
 341                 .n_linear_ranges = ARRAY_SIZE(vranges),                 \
 342                 .n_voltages = vcnts,                                    \
 343                 .off_on_delay = offon_delay,                            \
 344         },                                                              \
 345         .mode_reg = mreg,                                               \
 346         .mode_mask = mmask,                                             \
 347         .state_reg = streg,                                             \
 348         .state_mask = stmask,                                           \
 349         .irq_tables = irq_tbls,                                         \
 350         .irq_table_size = ARRAY_SIZE(irq_tbls),                         \
 351 }
 352
 353 static const struct mt6360_regulator_desc mt6360_regulator_descs[] =  {
 354         MT6360_REGULATOR_DESC(BUCK1, BUCK1_VIN, 0x117, 0x40, 0x110, 0xff, 0x117, 0x30, 0x117, 0x04,
 355                               buck_vout_ranges, 256, 0, buck1_irq_tbls),
 356         MT6360_REGULATOR_DESC(BUCK2, BUCK2_VIN, 0x127, 0x40, 0x120, 0xff, 0x127, 0x30, 0x127, 0x04,
 357                               buck_vout_ranges, 256, 0, buck2_irq_tbls),
 358         MT6360_REGULATOR_DESC(LDO6, LDO_VIN3, 0x137, 0x40, 0x13B, 0xff, 0x137, 0x30, 0x137, 0x04,
 359                               ldo_vout_ranges1, 256, 0, ldo6_irq_tbls),
 360         MT6360_REGULATOR_DESC(LDO7, LDO_VIN3, 0x131, 0x40, 0x135, 0xff, 0x131, 0x30, 0x131, 0x04,
 361                               ldo_vout_ranges1, 256, 0, ldo7_irq_tbls),
 362         MT6360_REGULATOR_DESC(LDO1, LDO_VIN1, 0x217, 0x40, 0x21B, 0xff, 0x217, 0x30, 0x217, 0x04,
 363                               ldo_vout_ranges2, 256, 0, ldo1_irq_tbls),
 364         MT6360_REGULATOR_DESC(LDO2, LDO_VIN1, 0x211, 0x40, 0x215, 0xff, 0x211, 0x30, 0x211, 0x04,
 365                               ldo_vout_ranges2, 256, 0, ldo2_irq_tbls),
 366         MT6360_REGULATOR_DESC(LDO3, LDO_VIN1, 0x205, 0x40, 0x209, 0xff, 0x205, 0x30, 0x205, 0x04,
 367                               ldo_vout_ranges2, 256, 100, ldo3_irq_tbls),
 368         MT6360_REGULATOR_DESC(LDO5, LDO_VIN2, 0x20B, 0x40, 0x20F, 0x7f, 0x20B, 0x30, 0x20B, 0x04,
 369                               ldo_vout_ranges3, 128, 100, ldo5_irq_tbls),
 370 };
 371
 372 static int mt6360_regulator_irq_register(struct platform_device *pdev,
 373                                          struct regulator_dev *rdev,
 374                                          const struct mt6360_irq_mapping *tbls,
 375                                          int tbl_size)
 376 {
 377         int i, irq, ret;
 378
 379         for (i = 0; i < tbl_size; i++) {
 380                 const struct mt6360_irq_mapping *irq_desc = tbls + i;
 381
 382                 irq = platform_get_irq_byname(pdev, irq_desc->name);
 383                 if (irq < 0) {
 384                         dev_err(&pdev->dev, "Fail to get %s irq\n", irq_desc->name);
 385                         return irq;
 386                 }
 387
 388                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, irq_desc->handler, 0,
 389                                                 irq_desc->name, rdev);
 390                 if (ret) {
 391                         dev_err(&pdev->dev, "Fail to request %s irq\n", irq_desc->name);
 392                         return ret;
 393                 }
 394         }
 395
 396         return 0;
 397 }
 398
 399 static int mt6360_regulator_probe(struct platform_device *pdev)
 400 {
 401         struct mt6360_regulator_data *mrd;
 402         struct regulator_config config = {};
 403         int i, ret;
 404
 405         mrd = devm_kzalloc(&pdev->dev, sizeof(*mrd), GFP_KERNEL);
 406         if (!mrd)
 407                 return -ENOMEM;
 408
 409         mrd->dev = &pdev->dev;
 410
 411         mrd->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 412         if (!mrd->regmap) {
 413                 dev_err(&pdev->dev, "Failed to get parent regmap\n");
 414                 return -ENODEV;
 415         }
 416
 417         config.dev = pdev->dev.parent;
 418         config.driver_data = mrd;
 419         config.regmap = mrd->regmap;
 420
 421         for (i = 0; i < ARRAY_SIZE(mt6360_regulator_descs); i++) {
 422                 const struct mt6360_regulator_desc *rdesc = mt6360_regulator_descs + i;
 423                 struct regulator_dev *rdev;
 424
 425                 rdev = devm_regulator_register(&pdev->dev, &rdesc->desc, &config);
 426                 if (IS_ERR(rdev)) {
 427                         dev_err(&pdev->dev, "Failed to register  %d regulator\n", i);
 428                         return PTR_ERR(rdev);
 429                 }
 430
 431                 ret = mt6360_regulator_irq_register(pdev, rdev, rdesc->irq_tables,
 432                                                     rdesc->irq_table_size);
 433                 if (ret) {
 434                         dev_err(&pdev->dev, "Failed to register  %d regulator irqs\n", i);
 435                         return ret;
 436                 }
 437         }
 438
 439         return 0;
 440 }
 441
 442 static const struct platform_device_id mt6360_regulator_id_table[] = {
 443         { "mt6360-regulator", 0 },
 444         {},
 445 };
 446 MODULE_DEVICE_TABLE(platform, mt6360_regulator_id_table);
 447
 448 static struct platform_driver mt6360_regulator_driver = {
 449         .driver = {
 450                 .name = "mt6360-regulator",
 451         },
 452         .probe = mt6360_regulator_probe,
 453         .id_table = mt6360_regulator_id_table,
 454 };
 455 module_platform_driver(mt6360_regulator_driver);
 456
 457 MODULE_AUTHOR("Gene Chen <gene_chen@richtek.com>");
 458 MODULE_DESCRIPTION("MT6360 Regulator Driver");
 459 MODULE_LICENSE("GPL v2");