drivers/regulator/twl-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
   4  *
   5  * Copyright (C) 2008 David Brownell
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/string.h>
  10 #include <linux/slab.h>
  11 #include <linux/init.h>
  12 #include <linux/err.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/regulator/of_regulator.h>
  19 #include <linux/mfd/twl.h>
  20 #include <linux/delay.h>
  21
  22 /*
  23  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
  24  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
  25  * include an audio codec, battery charger, and more voltage regulators.
  26  * These chips are often used in OMAP-based systems.
  27  *
  28  * This driver implements software-based resource control for various
  29  * voltage regulators.  This is usually augmented with state machine
  30  * based control.
  31  */
  32
  33 struct twlreg_info {
  34         /* start of regulator's PM_RECEIVER control register bank */
  35         u8                      base;
  36
  37         /* twl resource ID, for resource control state machine */
  38         u8                      id;
  39
  40         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
  41         u8                      table_len;
  42         const u16               *table;
  43
  44         /* State REMAP default configuration */
  45         u8                      remap;
  46
  47         /* used by regulator core */
  48         struct regulator_desc   desc;
  49
  50         /* chip specific features */
  51         unsigned long           features;
  52
  53         /* data passed from board for external get/set voltage */
  54         void                    *data;
  55 };
  56
  57
  58 /* LDO control registers ... offset is from the base of its register bank.
  59  * The first three registers of all power resource banks help hardware to
  60  * manage the various resource groups.
  61  */
  62 /* Common offset in TWL4030/6030 */
  63 #define VREG_GRP                0
  64 /* TWL4030 register offsets */
  65 #define VREG_TYPE               1
  66 #define VREG_REMAP              2
  67 #define VREG_DEDICATED          3       /* LDO control */
  68 #define VREG_VOLTAGE_SMPS_4030  9
  69 /* TWL6030 register offsets */
  70 #define VREG_TRANS              1
  71 #define VREG_STATE              2
  72 #define VREG_VOLTAGE            3
  73 #define VREG_VOLTAGE_SMPS       4
  74
  75 static inline int
  76 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
  77 {
  78         u8 value;
  79         int status;
  80
  81         status = twl_i2c_read_u8(slave_subgp,
  82                         &value, info->base + offset);
  83         return (status < 0) ? status : value;
  84 }
  85
  86 static inline int
  87 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
  88                                                  u8 value)
  89 {
  90         return twl_i2c_write_u8(slave_subgp,
  91                         value, info->base + offset);
  92 }
  93
  94 /*----------------------------------------------------------------------*/
  95
  96 /* generic power resource operations, which work on all regulators */
  97
  98 static int twlreg_grp(struct regulator_dev *rdev)
  99 {
 100         return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
 101                                                                  VREG_GRP);
 102 }
 103
 104 /*
 105  * Enable/disable regulators by joining/leaving the P1 (processor) group.
 106  * We assume nobody else is updating the DEV_GRP registers.
 107  */
 108 /* definition for 4030 family */
 109 #define P3_GRP_4030     BIT(7)          /* "peripherals" */
 110 #define P2_GRP_4030     BIT(6)          /* secondary processor, modem, etc */
 111 #define P1_GRP_4030     BIT(5)          /* CPU/Linux */
 112 /* definition for 6030 family */
 113 #define P3_GRP_6030     BIT(2)          /* secondary processor, modem, etc */
 114 #define P2_GRP_6030     BIT(1)          /* "peripherals" */
 115 #define P1_GRP_6030     BIT(0)          /* CPU/Linux */
 116
 117 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
 118 {
 119         int     state = twlreg_grp(rdev);
 120
 121         if (state < 0)
 122                 return state;
 123
 124         return state & P1_GRP_4030;
 125 }
 126
 127 #define PB_I2C_BUSY     BIT(0)
 128 #define PB_I2C_BWEN     BIT(1)
 129
 130 /* Wait until buffer empty/ready to send a word on power bus. */
 131 static int twl4030_wait_pb_ready(void)
 132 {
 133
 134         int     ret;
 135         int     timeout = 10;
 136         u8      val;
 137
 138         do {
 139                 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 140                                       TWL4030_PM_MASTER_PB_CFG);
 141                 if (ret < 0)
 142                         return ret;
 143
 144                 if (!(val & PB_I2C_BUSY))
 145                         return 0;
 146
 147                 mdelay(1);
 148                 timeout--;
 149         } while (timeout);
 150
 151         return -ETIMEDOUT;
 152 }
 153
 154 /* Send a word over the powerbus */
 155 static int twl4030_send_pb_msg(unsigned msg)
 156 {
 157         u8      val;
 158         int     ret;
 159
 160         /* save powerbus configuration */
 161         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 162                               TWL4030_PM_MASTER_PB_CFG);
 163         if (ret < 0)
 164                 return ret;
 165
 166         /* Enable i2c access to powerbus */
 167         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
 168                                TWL4030_PM_MASTER_PB_CFG);
 169         if (ret < 0)
 170                 return ret;
 171
 172         ret = twl4030_wait_pb_ready();
 173         if (ret < 0)
 174                 return ret;
 175
 176         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
 177                                TWL4030_PM_MASTER_PB_WORD_MSB);
 178         if (ret < 0)
 179                 return ret;
 180
 181         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
 182                                TWL4030_PM_MASTER_PB_WORD_LSB);
 183         if (ret < 0)
 184                 return ret;
 185
 186         ret = twl4030_wait_pb_ready();
 187         if (ret < 0)
 188                 return ret;
 189
 190         /* Restore powerbus configuration */
 191         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
 192                                 TWL4030_PM_MASTER_PB_CFG);
 193 }
 194
 195 static int twl4030reg_enable(struct regulator_dev *rdev)
 196 {
 197         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 198         int                     grp;
 199         int                     ret;
 200
 201         grp = twlreg_grp(rdev);
 202         if (grp < 0)
 203                 return grp;
 204
 205         grp |= P1_GRP_4030;
 206
 207         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 208
 209         return ret;
 210 }
 211
 212 static int twl4030reg_disable(struct regulator_dev *rdev)
 213 {
 214         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 215         int                     grp;
 216         int                     ret;
 217
 218         grp = twlreg_grp(rdev);
 219         if (grp < 0)
 220                 return grp;
 221
 222         grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
 223
 224         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 225
 226         return ret;
 227 }
 228
 229 static int twl4030reg_get_status(struct regulator_dev *rdev)
 230 {
 231         int     state = twlreg_grp(rdev);
 232
 233         if (state < 0)
 234                 return state;
 235         state &= 0x0f;
 236
 237         /* assume state != WARM_RESET; we'd not be running...  */
 238         if (!state)
 239                 return REGULATOR_STATUS_OFF;
 240         return (state & BIT(3))
 241                 ? REGULATOR_STATUS_NORMAL
 242                 : REGULATOR_STATUS_STANDBY;
 243 }
 244
 245 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
 246 {
 247         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 248         unsigned                message;
 249
 250         /* We can only set the mode through state machine commands... */
 251         switch (mode) {
 252         case REGULATOR_MODE_NORMAL:
 253                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 254                 break;
 255         case REGULATOR_MODE_STANDBY:
 256                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 257                 break;
 258         default:
 259                 return -EINVAL;
 260         }
 261
 262         return twl4030_send_pb_msg(message);
 263 }
 264
 265 static inline unsigned int twl4030reg_map_mode(unsigned int mode)
 266 {
 267         switch (mode) {
 268         case RES_STATE_ACTIVE:
 269                 return REGULATOR_MODE_NORMAL;
 270         case RES_STATE_SLEEP:
 271                 return REGULATOR_MODE_STANDBY;
 272         default:
 273                 return REGULATOR_MODE_INVALID;
 274         }
 275 }
 276
 277 /*----------------------------------------------------------------------*/
 278
 279 /*
 280  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 281  * select field in its control register.   We use tables indexed by VSEL
 282  * to record voltages in milliVolts.  (Accuracy is about three percent.)
 283  *
 284  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 285  * currently handled by listing two slightly different VAUX2 regulators,
 286  * only one of which will be configured.
 287  *
 288  * VSEL values documented as "TI cannot support these values" are flagged
 289  * in these tables as UNSUP() values; we normally won't assign them.
 290  *
 291  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
 292  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
 293  */
 294 #define UNSUP_MASK      0x8000
 295
 296 #define UNSUP(x)        (UNSUP_MASK | (x))
 297 #define IS_UNSUP(info, x)                       \
 298         ((UNSUP_MASK & (x)) &&                  \
 299          !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
 300 #define LDO_MV(x)       (~UNSUP_MASK & (x))
 301
 302
 303 static const u16 VAUX1_VSEL_table[] = {
 304         UNSUP(1500), UNSUP(1800), 2500, 2800,
 305         3000, 3000, 3000, 3000,
 306 };
 307 static const u16 VAUX2_4030_VSEL_table[] = {
 308         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 309         1500, 1800, UNSUP(1850), 2500,
 310         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 311         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 312 };
 313 static const u16 VAUX2_VSEL_table[] = {
 314         1700, 1700, 1900, 1300,
 315         1500, 1800, 2000, 2500,
 316         2100, 2800, 2200, 2300,
 317         2400, 2400, 2400, 2400,
 318 };
 319 static const u16 VAUX3_VSEL_table[] = {
 320         1500, 1800, 2500, 2800,
 321         3000, 3000, 3000, 3000,
 322 };
 323 static const u16 VAUX4_VSEL_table[] = {
 324         700, 1000, 1200, UNSUP(1300),
 325         1500, 1800, UNSUP(1850), 2500,
 326         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 327         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 328 };
 329 static const u16 VMMC1_VSEL_table[] = {
 330         1850, 2850, 3000, 3150,
 331 };
 332 static const u16 VMMC2_VSEL_table[] = {
 333         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 334         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 335         2600, 2800, 2850, 3000,
 336         3150, 3150, 3150, 3150,
 337 };
 338 static const u16 VPLL1_VSEL_table[] = {
 339         1000, 1200, 1300, 1800,
 340         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 341 };
 342 static const u16 VPLL2_VSEL_table[] = {
 343         700, 1000, 1200, 1300,
 344         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 345         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 346         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 347 };
 348 static const u16 VSIM_VSEL_table[] = {
 349         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 350         2800, 3000, 3000, 3000,
 351 };
 352 static const u16 VDAC_VSEL_table[] = {
 353         1200, 1300, 1800, 1800,
 354 };
 355 static const u16 VIO_VSEL_table[] = {
 356         1800, 1850,
 357 };
 358 static const u16 VINTANA2_VSEL_table[] = {
 359         2500, 2750,
 360 };
 361
 362 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 363 {
 364         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 365         int                     mV = info->table[index];
 366
 367         return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000);
 368 }
 369
 370 static int
 371 twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
 372 {
 373         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 374
 375         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
 376                             selector);
 377 }
 378
 379 static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev)
 380 {
 381         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 382         int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);
 383
 384         if (vsel < 0)
 385                 return vsel;
 386
 387         vsel &= info->table_len - 1;
 388         return vsel;
 389 }
 390
 391 static const struct regulator_ops twl4030ldo_ops = {
 392         .list_voltage   = twl4030ldo_list_voltage,
 393
 394         .set_voltage_sel = twl4030ldo_set_voltage_sel,
 395         .get_voltage_sel = twl4030ldo_get_voltage_sel,
 396
 397         .enable         = twl4030reg_enable,
 398         .disable        = twl4030reg_disable,
 399         .is_enabled     = twl4030reg_is_enabled,
 400
 401         .set_mode       = twl4030reg_set_mode,
 402
 403         .get_status     = twl4030reg_get_status,
 404 };
 405
 406 static int
 407 twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
 408                         unsigned *selector)
 409 {
 410         struct twlreg_info *info = rdev_get_drvdata(rdev);
 411         int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
 412
 413         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel);
 414
 415         return 0;
 416 }
 417
 418 static int twl4030smps_get_voltage(struct regulator_dev *rdev)
 419 {
 420         struct twlreg_info *info = rdev_get_drvdata(rdev);
 421         int vsel;
 422
 423         vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 424                 VREG_VOLTAGE_SMPS_4030);
 425
 426         return vsel * 12500 + 600000;
 427 }
 428
 429 static const struct regulator_ops twl4030smps_ops = {
 430         .set_voltage    = twl4030smps_set_voltage,
 431         .get_voltage    = twl4030smps_get_voltage,
 432 };
 433
 434 /*----------------------------------------------------------------------*/
 435
 436 static const struct regulator_ops twl4030fixed_ops = {
 437         .list_voltage   = regulator_list_voltage_linear,
 438
 439         .enable         = twl4030reg_enable,
 440         .disable        = twl4030reg_disable,
 441         .is_enabled     = twl4030reg_is_enabled,
 442
 443         .set_mode       = twl4030reg_set_mode,
 444
 445         .get_status     = twl4030reg_get_status,
 446 };
 447
 448 /*----------------------------------------------------------------------*/
 449
 450 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
 451 static const struct twlreg_info TWL4030_INFO_##label = { \
 452         .base = offset, \
 453         .id = num, \
 454         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 455         .table = label##_VSEL_table, \
 456         .remap = remap_conf, \
 457         .desc = { \
 458                 .name = #label, \
 459                 .id = TWL4030_REG_##label, \
 460                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 461                 .ops = &twl4030ldo_ops, \
 462                 .type = REGULATOR_VOLTAGE, \
 463                 .owner = THIS_MODULE, \
 464                 .enable_time = turnon_delay, \
 465                 .of_map_mode = twl4030reg_map_mode, \
 466                 }, \
 467         }
 468
 469 #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf) \
 470 static const struct twlreg_info TWL4030_INFO_##label = { \
 471         .base = offset, \
 472         .id = num, \
 473         .remap = remap_conf, \
 474         .desc = { \
 475                 .name = #label, \
 476                 .id = TWL4030_REG_##label, \
 477                 .ops = &twl4030smps_ops, \
 478                 .type = REGULATOR_VOLTAGE, \
 479                 .owner = THIS_MODULE, \
 480                 .enable_time = turnon_delay, \
 481                 .of_map_mode = twl4030reg_map_mode, \
 482                 }, \
 483         }
 484
 485 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 486                         remap_conf) \
 487 static const struct twlreg_info TWLFIXED_INFO_##label = { \
 488         .base = offset, \
 489         .id = num, \
 490         .remap = remap_conf, \
 491         .desc = { \
 492                 .name = #label, \
 493                 .id = TWL4030##_REG_##label, \
 494                 .n_voltages = 1, \
 495                 .ops = &twl4030fixed_ops, \
 496                 .type = REGULATOR_VOLTAGE, \
 497                 .owner = THIS_MODULE, \
 498                 .min_uV = mVolts * 1000, \
 499                 .enable_time = turnon_delay, \
 500                 .of_map_mode = twl4030reg_map_mode, \
 501                 }, \
 502         }
 503
 504 /*
 505  * We list regulators here if systems need some level of
 506  * software control over them after boot.
 507  */
 508 TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
 509 TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
 510 TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
 511 TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
 512 TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
 513 TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
 514 TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
 515 TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
 516 TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
 517 TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
 518 TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
 519 TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
 520 TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
 521 TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08);
 522 TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08);
 523 /* VUSBCP is managed *only* by the USB subchip */
 524 TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
 525 TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
 526 TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
 527 TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
 528 TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);
 529
 530 #define TWL_OF_MATCH(comp, family, label) \
 531         { \
 532                 .compatible = comp, \
 533                 .data = &family##_INFO_##label, \
 534         }
 535
 536 #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
 537 #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
 538 #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
 539 #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
 540 #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)
 541
 542 static const struct of_device_id twl_of_match[] = {
 543         TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
 544         TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
 545         TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
 546         TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
 547         TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
 548         TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
 549         TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
 550         TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
 551         TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
 552         TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
 553         TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
 554         TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
 555         TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
 556         TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
 557         TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
 558         TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
 559         TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
 560         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
 561         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
 562         TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
 563         {},
 564 };
 565 MODULE_DEVICE_TABLE(of, twl_of_match);
 566
 567 static int twlreg_probe(struct platform_device *pdev)
 568 {
 569         int id;
 570         struct twlreg_info              *info;
 571         const struct twlreg_info        *template;
 572         struct regulator_init_data      *initdata;
 573         struct regulation_constraints   *c;
 574         struct regulator_dev            *rdev;
 575         struct regulator_config         config = { };
 576
 577         template = of_device_get_match_data(&pdev->dev);
 578         if (!template)
 579                 return -ENODEV;
 580
 581         id = template->desc.id;
 582         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
 583                                                 &template->desc);
 584         if (!initdata)
 585                 return -EINVAL;
 586
 587         info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
 588         if (!info)
 589                 return -ENOMEM;
 590
 591         /* Constrain board-specific capabilities according to what
 592          * this driver and the chip itself can actually do.
 593          */
 594         c = &initdata->constraints;
 595         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 596         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 597                                 | REGULATOR_CHANGE_MODE
 598                                 | REGULATOR_CHANGE_STATUS;
 599         switch (id) {
 600         case TWL4030_REG_VIO:
 601         case TWL4030_REG_VDD1:
 602         case TWL4030_REG_VDD2:
 603         case TWL4030_REG_VPLL1:
 604         case TWL4030_REG_VINTANA1:
 605         case TWL4030_REG_VINTANA2:
 606         case TWL4030_REG_VINTDIG:
 607                 c->always_on = true;
 608                 break;
 609         default:
 610                 break;
 611         }
 612
 613         config.dev = &pdev->dev;
 614         config.init_data = initdata;
 615         config.driver_data = info;
 616         config.of_node = pdev->dev.of_node;
 617
 618         rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
 619         if (IS_ERR(rdev)) {
 620                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 621                                 info->desc.name, PTR_ERR(rdev));
 622                 return PTR_ERR(rdev);
 623         }
 624         platform_set_drvdata(pdev, rdev);
 625
 626         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);
 627
 628         /* NOTE:  many regulators support short-circuit IRQs (presentable
 629          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 630          *  - SC_CONFIG
 631          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 632          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 633          *  - IT_CONFIG
 634          */
 635
 636         return 0;
 637 }
 638
 639 MODULE_ALIAS("platform:twl4030_reg");
 640
 641 static struct platform_driver twlreg_driver = {
 642         .probe          = twlreg_probe,
 643         /* NOTE: short name, to work around driver model truncation of
 644          * "twl_regulator.12" (and friends) to "twl_regulator.1".
 645          */
 646         .driver  = {
 647                 .name  = "twl4030_reg",
 648                 .of_match_table = of_match_ptr(twl_of_match),
 649         },
 650 };
 651
 652 static int __init twlreg_init(void)
 653 {
 654         return platform_driver_register(&twlreg_driver);
 655 }
 656 subsys_initcall(twlreg_init);
 657
 658 static void __exit twlreg_exit(void)
 659 {
 660         platform_driver_unregister(&twlreg_driver);
 661 }
 662 module_exit(twlreg_exit)
 663
 664 MODULE_DESCRIPTION("TWL4030 regulator driver");
 665 MODULE_LICENSE("GPL");