drivers/regulator/fan53555.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
   4 //
   5 // Supported Part Numbers:
   6 // FAN53555UC00X/01X/03X/04X/05X
   7 //
   8 // Copyright (c) 2012 Marvell Technology Ltd.
   9 // Yunfan Zhang <yfzhang@marvell.com>
  10
  11 #include <linux/module.h>
  12 #include <linux/param.h>
  13 #include <linux/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/regulator/of_regulator.h>
  18 #include <linux/of_device.h>
  19 #include <linux/i2c.h>
  20 #include <linux/slab.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/fan53555.h>
  23
  24 /* Voltage setting */
  25 #define FAN53555_VSEL0          0x00
  26 #define FAN53555_VSEL1          0x01
  27
  28 #define TCS4525_VSEL0           0x11
  29 #define TCS4525_VSEL1           0x10
  30 #define TCS4525_TIME            0x13
  31 #define TCS4525_COMMAND         0x14
  32
  33 /* Control register */
  34 #define FAN53555_CONTROL        0x02
  35 /* IC Type */
  36 #define FAN53555_ID1            0x03
  37 /* IC mask version */
  38 #define FAN53555_ID2            0x04
  39 /* Monitor register */
  40 #define FAN53555_MONITOR        0x05
  41
  42 /* VSEL bit definitions */
  43 #define VSEL_BUCK_EN    (1 << 7)
  44 #define VSEL_MODE               (1 << 6)
  45 /* Chip ID and Verison */
  46 #define DIE_ID          0x0F    /* ID1 */
  47 #define DIE_REV         0x0F    /* ID2 */
  48 /* Control bit definitions */
  49 #define CTL_OUTPUT_DISCHG       (1 << 7)
  50 #define CTL_SLEW_MASK           (0x7 << 4)
  51 #define CTL_SLEW_SHIFT          4
  52 #define CTL_RESET                       (1 << 2)
  53 #define CTL_MODE_VSEL0_MODE     BIT(0)
  54 #define CTL_MODE_VSEL1_MODE     BIT(1)
  55
  56 #define FAN53555_NVOLTAGES      64      /* Numbers of voltages */
  57 #define FAN53526_NVOLTAGES      128
  58 #define TCS4525_NVOLTAGES       127     /* Numbers of voltages */
  59
  60 #define TCS_VSEL_NSEL_MASK      0x7f
  61 #define TCS_VSEL0_MODE          (1 << 7)
  62 #define TCS_VSEL1_MODE          (1 << 6)
  63
  64 #define TCS_SLEW_SHIFT          3
  65 #define TCS_SLEW_MASK           (0x3 < 3)
  66
  67 enum fan53555_vendor {
  68         FAN53526_VENDOR_FAIRCHILD = 0,
  69         FAN53555_VENDOR_FAIRCHILD,
  70         FAN53555_VENDOR_SILERGY,
  71         FAN53555_VENDOR_TCS,
  72 };
  73
  74 enum {
  75         FAN53526_CHIP_ID_01 = 1,
  76 };
  77
  78 enum {
  79         FAN53526_CHIP_REV_08 = 8,
  80 };
  81
  82 /* IC Type */
  83 enum {
  84         FAN53555_CHIP_ID_00 = 0,
  85         FAN53555_CHIP_ID_01,
  86         FAN53555_CHIP_ID_02,
  87         FAN53555_CHIP_ID_03,
  88         FAN53555_CHIP_ID_04,
  89         FAN53555_CHIP_ID_05,
  90         FAN53555_CHIP_ID_08 = 8,
  91 };
  92
  93 /* IC mask revision */
  94 enum {
  95         FAN53555_CHIP_REV_00 = 0x3,
  96         FAN53555_CHIP_REV_13 = 0xf,
  97 };
  98
  99 enum {
 100         SILERGY_SYR82X = 8,
 101         SILERGY_SYR83X = 9,
 102 };
 103
 104 struct fan53555_device_info {
 105         enum fan53555_vendor vendor;
 106         struct device *dev;
 107         struct regulator_desc desc;
 108         struct regulator_init_data *regulator;
 109         /* IC Type and Rev */
 110         int chip_id;
 111         int chip_rev;
 112         /* Voltage setting register */
 113         unsigned int vol_reg;
 114         unsigned int sleep_reg;
 115         /* Voltage range and step(linear) */
 116         unsigned int vsel_min;
 117         unsigned int vsel_step;
 118         unsigned int vsel_count;
 119         /* Mode */
 120         unsigned int mode_reg;
 121         unsigned int mode_mask;
 122         /* Sleep voltage cache */
 123         unsigned int sleep_vol_cache;
 124         /* Slew rate */
 125         unsigned int slew_reg;
 126         unsigned int slew_mask;
 127         unsigned int slew_shift;
 128         unsigned int slew_rate;
 129 };
 130
 131 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 132 {
 133         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 134         int ret;
 135
 136         if (di->sleep_vol_cache == uV)
 137                 return 0;
 138         ret = regulator_map_voltage_linear(rdev, uV, uV);
 139         if (ret < 0)
 140                 return ret;
 141         ret = regmap_update_bits(rdev->regmap, di->sleep_reg,
 142                                  di->desc.vsel_mask, ret);
 143         if (ret < 0)
 144                 return ret;
 145         /* Cache the sleep voltage setting.
 146          * Might not be the real voltage which is rounded */
 147         di->sleep_vol_cache = uV;
 148
 149         return 0;
 150 }
 151
 152 static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
 153 {
 154         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 155
 156         return regmap_update_bits(rdev->regmap, di->sleep_reg,
 157                                   VSEL_BUCK_EN, VSEL_BUCK_EN);
 158 }
 159
 160 static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
 161 {
 162         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 163
 164         return regmap_update_bits(rdev->regmap, di->sleep_reg,
 165                                   VSEL_BUCK_EN, 0);
 166 }
 167
 168 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
 169 {
 170         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 171
 172         switch (mode) {
 173         case REGULATOR_MODE_FAST:
 174                 regmap_update_bits(rdev->regmap, di->mode_reg,
 175                                    di->mode_mask, di->mode_mask);
 176                 break;
 177         case REGULATOR_MODE_NORMAL:
 178                 regmap_update_bits(rdev->regmap, di->vol_reg, di->mode_mask, 0);
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183         return 0;
 184 }
 185
 186 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 187 {
 188         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 189         unsigned int val;
 190         int ret = 0;
 191
 192         ret = regmap_read(rdev->regmap, di->mode_reg, &val);
 193         if (ret < 0)
 194                 return ret;
 195         if (val & di->mode_mask)
 196                 return REGULATOR_MODE_FAST;
 197         else
 198                 return REGULATOR_MODE_NORMAL;
 199 }
 200
 201 static const int slew_rates[] = {
 202         64000,
 203         32000,
 204         16000,
 205          8000,
 206          4000,
 207          2000,
 208          1000,
 209           500,
 210 };
 211
 212 static const int tcs_slew_rates[] = {
 213         18700,
 214          9300,
 215          4600,
 216          2300,
 217 };
 218
 219 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 220 {
 221         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 222         int regval = -1, i;
 223         const int *slew_rate_t;
 224         int slew_rate_n;
 225
 226         switch (di->vendor) {
 227         case FAN53526_VENDOR_FAIRCHILD:
 228         case FAN53555_VENDOR_FAIRCHILD:
 229         case FAN53555_VENDOR_SILERGY:
 230                 slew_rate_t = slew_rates;
 231                 slew_rate_n = ARRAY_SIZE(slew_rates);
 232                 break;
 233         case FAN53555_VENDOR_TCS:
 234                 slew_rate_t = tcs_slew_rates;
 235                 slew_rate_n = ARRAY_SIZE(tcs_slew_rates);
 236                 break;
 237         default:
 238                 return -EINVAL;
 239         }
 240
 241         for (i = 0; i < slew_rate_n; i++) {
 242                 if (ramp <= slew_rate_t[i])
 243                         regval = i;
 244                 else
 245                         break;
 246         }
 247
 248         if (regval < 0) {
 249                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 250                 return -EINVAL;
 251         }
 252
 253         return regmap_update_bits(rdev->regmap, di->slew_reg,
 254                                   di->slew_mask, regval << di->slew_shift);
 255 }
 256
 257 static const struct regulator_ops fan53555_regulator_ops = {
 258         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 259         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 260         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 261         .map_voltage = regulator_map_voltage_linear,
 262         .list_voltage = regulator_list_voltage_linear,
 263         .set_suspend_voltage = fan53555_set_suspend_voltage,
 264         .enable = regulator_enable_regmap,
 265         .disable = regulator_disable_regmap,
 266         .is_enabled = regulator_is_enabled_regmap,
 267         .set_mode = fan53555_set_mode,
 268         .get_mode = fan53555_get_mode,
 269         .set_ramp_delay = fan53555_set_ramp,
 270         .set_suspend_enable = fan53555_set_suspend_enable,
 271         .set_suspend_disable = fan53555_set_suspend_disable,
 272 };
 273
 274 static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di)
 275 {
 276         /* Init voltage range and step */
 277         switch (di->chip_id) {
 278         case FAN53526_CHIP_ID_01:
 279                 switch (di->chip_rev) {
 280                 case FAN53526_CHIP_REV_08:
 281                         di->vsel_min = 600000;
 282                         di->vsel_step = 6250;
 283                         break;
 284                 default:
 285                         dev_err(di->dev,
 286                                 "Chip ID %d with rev %d not supported!\n",
 287                                 di->chip_id, di->chip_rev);
 288                         return -EINVAL;
 289                 }
 290                 break;
 291         default:
 292                 dev_err(di->dev,
 293                         "Chip ID %d not supported!\n", di->chip_id);
 294                 return -EINVAL;
 295         }
 296
 297         di->vsel_count = FAN53526_NVOLTAGES;
 298
 299         return 0;
 300 }
 301
 302 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 303 {
 304         /* Init voltage range and step */
 305         switch (di->chip_id) {
 306         case FAN53555_CHIP_ID_00:
 307                 switch (di->chip_rev) {
 308                 case FAN53555_CHIP_REV_00:
 309                         di->vsel_min = 600000;
 310                         di->vsel_step = 10000;
 311                         break;
 312                 case FAN53555_CHIP_REV_13:
 313                         di->vsel_min = 800000;
 314                         di->vsel_step = 10000;
 315                         break;
 316                 default:
 317                         dev_err(di->dev,
 318                                 "Chip ID %d with rev %d not supported!\n",
 319                                 di->chip_id, di->chip_rev);
 320                         return -EINVAL;
 321                 }
 322                 break;
 323         case FAN53555_CHIP_ID_01:
 324         case FAN53555_CHIP_ID_03:
 325         case FAN53555_CHIP_ID_05:
 326         case FAN53555_CHIP_ID_08:
 327                 di->vsel_min = 600000;
 328                 di->vsel_step = 10000;
 329                 break;
 330         case FAN53555_CHIP_ID_04:
 331                 di->vsel_min = 603000;
 332                 di->vsel_step = 12826;
 333                 break;
 334         default:
 335                 dev_err(di->dev,
 336                         "Chip ID %d not supported!\n", di->chip_id);
 337                 return -EINVAL;
 338         }
 339         di->slew_reg = FAN53555_CONTROL;
 340         di->slew_mask = CTL_SLEW_MASK;
 341         di->slew_shift = CTL_SLEW_SHIFT;
 342         di->vsel_count = FAN53555_NVOLTAGES;
 343
 344         return 0;
 345 }
 346
 347 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 348 {
 349         /* Init voltage range and step */
 350         switch (di->chip_id) {
 351         case SILERGY_SYR82X:
 352         case SILERGY_SYR83X:
 353                 di->vsel_min = 712500;
 354                 di->vsel_step = 12500;
 355                 break;
 356         default:
 357                 dev_err(di->dev,
 358                         "Chip ID %d not supported!\n", di->chip_id);
 359                 return -EINVAL;
 360         }
 361         di->slew_reg = FAN53555_CONTROL;
 362         di->slew_reg = FAN53555_CONTROL;
 363         di->slew_mask = CTL_SLEW_MASK;
 364         di->slew_shift = CTL_SLEW_SHIFT;
 365         di->vsel_count = FAN53555_NVOLTAGES;
 366
 367         return 0;
 368 }
 369
 370 static int fan53555_voltages_setup_tcs(struct fan53555_device_info *di)
 371 {
 372         di->slew_reg = TCS4525_TIME;
 373         di->slew_mask = TCS_SLEW_MASK;
 374         di->slew_shift = TCS_SLEW_MASK;
 375
 376         /* Init voltage range and step */
 377         di->vsel_min = 600000;
 378         di->vsel_step = 6250;
 379         di->vsel_count = TCS4525_NVOLTAGES;
 380
 381         return 0;
 382 }
 383
 384 /* For 00,01,03,05 options:
 385  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 386  * For 04 option:
 387  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 388  * */
 389 static int fan53555_device_setup(struct fan53555_device_info *di,
 390                                 struct fan53555_platform_data *pdata)
 391 {
 392         int ret = 0;
 393
 394         /* Setup voltage control register */
 395         switch (di->vendor) {
 396         case FAN53526_VENDOR_FAIRCHILD:
 397         case FAN53555_VENDOR_FAIRCHILD:
 398         case FAN53555_VENDOR_SILERGY:
 399                 switch (pdata->sleep_vsel_id) {
 400                 case FAN53555_VSEL_ID_0:
 401                         di->sleep_reg = FAN53555_VSEL0;
 402                         di->vol_reg = FAN53555_VSEL1;
 403                         break;
 404                 case FAN53555_VSEL_ID_1:
 405                         di->sleep_reg = FAN53555_VSEL1;
 406                         di->vol_reg = FAN53555_VSEL0;
 407                         break;
 408                 default:
 409                         dev_err(di->dev, "Invalid VSEL ID!\n");
 410                         return -EINVAL;
 411                 }
 412                 break;
 413         case FAN53555_VENDOR_TCS:
 414                 switch (pdata->sleep_vsel_id) {
 415                 case FAN53555_VSEL_ID_0:
 416                         di->sleep_reg = TCS4525_VSEL0;
 417                         di->vol_reg = TCS4525_VSEL1;
 418                         break;
 419                 case FAN53555_VSEL_ID_1:
 420                         di->sleep_reg = TCS4525_VSEL1;
 421                         di->vol_reg = TCS4525_VSEL0;
 422                         break;
 423                 default:
 424                         dev_err(di->dev, "Invalid VSEL ID!\n");
 425                         return -EINVAL;
 426                 }
 427                 break;
 428         default:
 429                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 430                 return -EINVAL;
 431         }
 432
 433         /* Setup mode control register */
 434         switch (di->vendor) {
 435         case FAN53526_VENDOR_FAIRCHILD:
 436                 di->mode_reg = FAN53555_CONTROL;
 437
 438                 switch (pdata->sleep_vsel_id) {
 439                 case FAN53555_VSEL_ID_0:
 440                         di->mode_mask = CTL_MODE_VSEL1_MODE;
 441                         break;
 442                 case FAN53555_VSEL_ID_1:
 443                         di->mode_mask = CTL_MODE_VSEL0_MODE;
 444                         break;
 445                 }
 446                 break;
 447         case FAN53555_VENDOR_FAIRCHILD:
 448         case FAN53555_VENDOR_SILERGY:
 449                 di->mode_reg = di->vol_reg;
 450                 di->mode_mask = VSEL_MODE;
 451                 break;
 452         case FAN53555_VENDOR_TCS:
 453                 di->mode_reg = TCS4525_COMMAND;
 454
 455                 switch (pdata->sleep_vsel_id) {
 456                 case FAN53555_VSEL_ID_0:
 457                         di->mode_mask = TCS_VSEL1_MODE;
 458                         break;
 459                 case FAN53555_VSEL_ID_1:
 460                         di->mode_mask = TCS_VSEL0_MODE;
 461                         break;
 462                 }
 463                 break;
 464         default:
 465                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 466                 return -EINVAL;
 467         }
 468
 469         /* Setup voltage range */
 470         switch (di->vendor) {
 471         case FAN53526_VENDOR_FAIRCHILD:
 472                 ret = fan53526_voltages_setup_fairchild(di);
 473                 break;
 474         case FAN53555_VENDOR_FAIRCHILD:
 475                 ret = fan53555_voltages_setup_fairchild(di);
 476                 break;
 477         case FAN53555_VENDOR_SILERGY:
 478                 ret = fan53555_voltages_setup_silergy(di);
 479                 break;
 480         case FAN53555_VENDOR_TCS:
 481                 ret = fan53555_voltages_setup_tcs(di);
 482                 break;
 483         default:
 484                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 485                 return -EINVAL;
 486         }
 487
 488         return ret;
 489 }
 490
 491 static int fan53555_regulator_register(struct fan53555_device_info *di,
 492                         struct regulator_config *config)
 493 {
 494         struct regulator_desc *rdesc = &di->desc;
 495         struct regulator_dev *rdev;
 496
 497         rdesc->name = "fan53555-reg";
 498         rdesc->supply_name = "vin";
 499         rdesc->ops = &fan53555_regulator_ops;
 500         rdesc->type = REGULATOR_VOLTAGE;
 501         rdesc->n_voltages = di->vsel_count;
 502         rdesc->enable_reg = di->vol_reg;
 503         rdesc->enable_mask = VSEL_BUCK_EN;
 504         rdesc->min_uV = di->vsel_min;
 505         rdesc->uV_step = di->vsel_step;
 506         rdesc->vsel_reg = di->vol_reg;
 507         rdesc->vsel_mask = di->vsel_count - 1;
 508         rdesc->owner = THIS_MODULE;
 509
 510         rdev = devm_regulator_register(di->dev, &di->desc, config);
 511         return PTR_ERR_OR_ZERO(rdev);
 512 }
 513
 514 static const struct regmap_config fan53555_regmap_config = {
 515         .reg_bits = 8,
 516         .val_bits = 8,
 517 };
 518
 519 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 520                                               struct device_node *np,
 521                                               const struct regulator_desc *desc)
 522 {
 523         struct fan53555_platform_data *pdata;
 524         int ret;
 525         u32 tmp;
 526
 527         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 528         if (!pdata)
 529                 return NULL;
 530
 531         pdata->regulator = of_get_regulator_init_data(dev, np, desc);
 532
 533         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 534                                    &tmp);
 535         if (!ret)
 536                 pdata->sleep_vsel_id = tmp;
 537
 538         return pdata;
 539 }
 540
 541 static const struct of_device_id __maybe_unused fan53555_dt_ids[] = {
 542         {
 543                 .compatible = "fcs,fan53526",
 544                 .data = (void *)FAN53526_VENDOR_FAIRCHILD,
 545         }, {
 546                 .compatible = "fcs,fan53555",
 547                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 548         }, {
 549                 .compatible = "silergy,syr827",
 550                 .data = (void *)FAN53555_VENDOR_SILERGY,
 551         }, {
 552                 .compatible = "silergy,syr828",
 553                 .data = (void *)FAN53555_VENDOR_SILERGY,
 554         }, {
 555                 .compatible = "tcs,tcs4525",
 556                 .data = (void *)FAN53555_VENDOR_TCS
 557         },
 558         { }
 559 };
 560 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 561
 562 static int fan53555_regulator_probe(struct i2c_client *client,
 563                                 const struct i2c_device_id *id)
 564 {
 565         struct device_node *np = client->dev.of_node;
 566         struct fan53555_device_info *di;
 567         struct fan53555_platform_data *pdata;
 568         struct regulator_config config = { };
 569         struct regmap *regmap;
 570         unsigned int val;
 571         int ret;
 572
 573         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 574                                         GFP_KERNEL);
 575         if (!di)
 576                 return -ENOMEM;
 577
 578         pdata = dev_get_platdata(&client->dev);
 579         if (!pdata)
 580                 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
 581
 582         if (!pdata || !pdata->regulator) {
 583                 dev_err(&client->dev, "Platform data not found!\n");
 584                 return -ENODEV;
 585         }
 586
 587         di->regulator = pdata->regulator;
 588         if (client->dev.of_node) {
 589                 di->vendor =
 590                         (unsigned long)of_device_get_match_data(&client->dev);
 591         } else {
 592                 /* if no ramp constraint set, get the pdata ramp_delay */
 593                 if (!di->regulator->constraints.ramp_delay) {
 594                         if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) {
 595                                 dev_err(&client->dev, "Invalid slew_rate\n");
 596                                 return -EINVAL;
 597                         }
 598
 599                         di->regulator->constraints.ramp_delay
 600                                         = slew_rates[pdata->slew_rate];
 601                 }
 602
 603                 di->vendor = id->driver_data;
 604         }
 605
 606         regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 607         if (IS_ERR(regmap)) {
 608                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 609                 return PTR_ERR(regmap);
 610         }
 611         di->dev = &client->dev;
 612         i2c_set_clientdata(client, di);
 613         /* Get chip ID */
 614         ret = regmap_read(regmap, FAN53555_ID1, &val);
 615         if (ret < 0) {
 616                 dev_err(&client->dev, "Failed to get chip ID!\n");
 617                 return ret;
 618         }
 619         di->chip_id = val & DIE_ID;
 620         /* Get chip revision */
 621         ret = regmap_read(regmap, FAN53555_ID2, &val);
 622         if (ret < 0) {
 623                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 624                 return ret;
 625         }
 626         di->chip_rev = val & DIE_REV;
 627         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 628                                 di->chip_id, di->chip_rev);
 629         /* Device init */
 630         ret = fan53555_device_setup(di, pdata);
 631         if (ret < 0) {
 632                 dev_err(&client->dev, "Failed to setup device!\n");
 633                 return ret;
 634         }
 635         /* Register regulator */
 636         config.dev = di->dev;
 637         config.init_data = di->regulator;
 638         config.regmap = regmap;
 639         config.driver_data = di;
 640         config.of_node = np;
 641
 642         ret = fan53555_regulator_register(di, &config);
 643         if (ret < 0)
 644                 dev_err(&client->dev, "Failed to register regulator!\n");
 645         return ret;
 646
 647 }
 648
 649 static const struct i2c_device_id fan53555_id[] = {
 650         {
 651                 .name = "fan53526",
 652                 .driver_data = FAN53526_VENDOR_FAIRCHILD
 653         }, {
 654                 .name = "fan53555",
 655                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 656         }, {
 657                 .name = "syr827",
 658                 .driver_data = FAN53555_VENDOR_SILERGY
 659         }, {
 660                 .name = "syr828",
 661                 .driver_data = FAN53555_VENDOR_SILERGY
 662         }, {
 663                 .name = "tcs4525",
 664                 .driver_data = FAN53555_VENDOR_TCS
 665         },
 666         { },
 667 };
 668 MODULE_DEVICE_TABLE(i2c, fan53555_id);
 669
 670 static struct i2c_driver fan53555_regulator_driver = {
 671         .driver = {
 672                 .name = "fan53555-regulator",
 673                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 674         },
 675         .probe = fan53555_regulator_probe,
 676         .id_table = fan53555_id,
 677 };
 678
 679 module_i2c_driver(fan53555_regulator_driver);
 680
 681 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 682 MODULE_DESCRIPTION("FAN53555 regulator driver");
 683 MODULE_LICENSE("GPL v2");