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/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/regulator/of_regulator.h>
  18 #include <linux/mfd/twl.h>
  19 #include <linux/delay.h>
  20
  21 /*
  22  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
  23  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
  24  * include an audio codec, battery charger, and more voltage regulators.
  25  * These chips are often used in OMAP-based systems.
  26  *
  27  * This driver implements software-based resource control for various
  28  * voltage regulators.  This is usually augmented with state machine
  29  * based control.
  30  */
  31
  32 struct twlreg_info {
  33         /* start of regulator's PM_RECEIVER control register bank */
  34         u8                      base;
  35
  36         /* twl resource ID, for resource control state machine */
  37         u8                      id;
  38
  39         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
  40         u8                      table_len;
  41         const u16               *table;
  42
  43         /* State REMAP default configuration */
  44         u8                      remap;
  45
  46         /* used by regulator core */
  47         struct regulator_desc   desc;
  48
  49         /* chip specific features */
  50         unsigned long           features;
  51
  52         /* data passed from board for external get/set voltage */
  53         void                    *data;
  54 };
  55
  56
  57 /* LDO control registers ... offset is from the base of its register bank.
  58  * The first three registers of all power resource banks help hardware to
  59  * manage the various resource groups.
  60  */
  61 /* Common offset in TWL4030/6030 */
  62 #define VREG_GRP                0
  63 /* TWL4030 register offsets */
  64 #define VREG_TYPE               1
  65 #define VREG_REMAP              2
  66 #define VREG_DEDICATED          3       /* LDO control */
  67 #define VREG_VOLTAGE_SMPS_4030  9
  68 /* TWL6030 register offsets */
  69 #define VREG_TRANS              1
  70 #define VREG_STATE              2
  71 #define VREG_VOLTAGE            3
  72 #define VREG_VOLTAGE_SMPS       4
  73
  74 static inline int
  75 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
  76 {
  77         u8 value;
  78         int status;
  79
  80         status = twl_i2c_read_u8(slave_subgp,
  81                         &value, info->base + offset);
  82         return (status < 0) ? status : value;
  83 }
  84
  85 static inline int
  86 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
  87                                                  u8 value)
  88 {
  89         return twl_i2c_write_u8(slave_subgp,
  90                         value, info->base + offset);
  91 }
  92
  93 /*----------------------------------------------------------------------*/
  94
  95 /* generic power resource operations, which work on all regulators */
  96
  97 static int twlreg_grp(struct regulator_dev *rdev)
  98 {
  99         return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
 100                                                                  VREG_GRP);
 101 }
 102
 103 /*
 104  * Enable/disable regulators by joining/leaving the P1 (processor) group.
 105  * We assume nobody else is updating the DEV_GRP registers.
 106  */
 107 /* definition for 4030 family */
 108 #define P3_GRP_4030     BIT(7)          /* "peripherals" */
 109 #define P2_GRP_4030     BIT(6)          /* secondary processor, modem, etc */
 110 #define P1_GRP_4030     BIT(5)          /* CPU/Linux */
 111 /* definition for 6030 family */
 112 #define P3_GRP_6030     BIT(2)          /* secondary processor, modem, etc */
 113 #define P2_GRP_6030     BIT(1)          /* "peripherals" */
 114 #define P1_GRP_6030     BIT(0)          /* CPU/Linux */
 115
 116 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
 117 {
 118         int     state = twlreg_grp(rdev);
 119
 120         if (state < 0)
 121                 return state;
 122
 123         return state & P1_GRP_4030;
 124 }
 125
 126 #define PB_I2C_BUSY     BIT(0)
 127 #define PB_I2C_BWEN     BIT(1)
 128
 129 /* Wait until buffer empty/ready to send a word on power bus. */
 130 static int twl4030_wait_pb_ready(void)
 131 {
 132
 133         int     ret;
 134         int     timeout = 10;
 135         u8      val;
 136
 137         do {
 138                 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 139                                       TWL4030_PM_MASTER_PB_CFG);
 140                 if (ret < 0)
 141                         return ret;
 142
 143                 if (!(val & PB_I2C_BUSY))
 144                         return 0;
 145
 146                 mdelay(1);
 147                 timeout--;
 148         } while (timeout);
 149
 150         return -ETIMEDOUT;
 151 }
 152
 153 /* Send a word over the powerbus */
 154 static int twl4030_send_pb_msg(unsigned msg)
 155 {
 156         u8      val;
 157         int     ret;
 158
 159         /* save powerbus configuration */
 160         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 161                               TWL4030_PM_MASTER_PB_CFG);
 162         if (ret < 0)
 163                 return ret;
 164
 165         /* Enable i2c access to powerbus */
 166         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
 167                                TWL4030_PM_MASTER_PB_CFG);
 168         if (ret < 0)
 169                 return ret;
 170
 171         ret = twl4030_wait_pb_ready();
 172         if (ret < 0)
 173                 return ret;
 174
 175         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
 176                                TWL4030_PM_MASTER_PB_WORD_MSB);
 177         if (ret < 0)
 178                 return ret;
 179
 180         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
 181                                TWL4030_PM_MASTER_PB_WORD_LSB);
 182         if (ret < 0)
 183                 return ret;
 184
 185         ret = twl4030_wait_pb_ready();
 186         if (ret < 0)
 187                 return ret;
 188
 189         /* Restore powerbus configuration */
 190         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
 191                                 TWL4030_PM_MASTER_PB_CFG);
 192 }
 193
 194 static int twl4030reg_enable(struct regulator_dev *rdev)
 195 {
 196         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 197         int                     grp;
 198
 199         grp = twlreg_grp(rdev);
 200         if (grp < 0)
 201                 return grp;
 202
 203         grp |= P1_GRP_4030;
 204
 205         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 206 }
 207
 208 static int twl4030reg_disable(struct regulator_dev *rdev)
 209 {
 210         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 211         int                     grp;
 212
 213         grp = twlreg_grp(rdev);
 214         if (grp < 0)
 215                 return grp;
 216
 217         grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
 218
 219         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 220 }
 221
 222 static int twl4030reg_get_status(struct regulator_dev *rdev)
 223 {
 224         int     state = twlreg_grp(rdev);
 225
 226         if (state < 0)
 227                 return state;
 228         state &= 0x0f;
 229
 230         /* assume state != WARM_RESET; we'd not be running...  */
 231         if (!state)
 232                 return REGULATOR_STATUS_OFF;
 233         return (state & BIT(3))
 234                 ? REGULATOR_STATUS_NORMAL
 235                 : REGULATOR_STATUS_STANDBY;
 236 }
 237
 238 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
 239 {
 240         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 241         unsigned                message;
 242
 243         /* We can only set the mode through state machine commands... */
 244         switch (mode) {
 245         case REGULATOR_MODE_NORMAL:
 246                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 247                 break;
 248         case REGULATOR_MODE_STANDBY:
 249                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 250                 break;
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         return twl4030_send_pb_msg(message);
 256 }
 257
 258 static inline unsigned int twl4030reg_map_mode(unsigned int mode)
 259 {
 260         switch (mode) {
 261         case RES_STATE_ACTIVE:
 262                 return REGULATOR_MODE_NORMAL;
 263         case RES_STATE_SLEEP:
 264                 return REGULATOR_MODE_STANDBY;
 265         default:
 266                 return REGULATOR_MODE_INVALID;
 267         }
 268 }
 269
 270 /*----------------------------------------------------------------------*/
 271
 272 /*
 273  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 274  * select field in its control register.   We use tables indexed by VSEL
 275  * to record voltages in milliVolts.  (Accuracy is about three percent.)
 276  *
 277  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 278  * currently handled by listing two slightly different VAUX2 regulators,
 279  * only one of which will be configured.
 280  *
 281  * VSEL values documented as "TI cannot support these values" are flagged
 282  * in these tables as UNSUP() values; we normally won't assign them.
 283  *
 284  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
 285  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
 286  */
 287 #define UNSUP_MASK      0x8000
 288
 289 #define UNSUP(x)        (UNSUP_MASK | (x))
 290 #define IS_UNSUP(info, x)                       \
 291         ((UNSUP_MASK & (x)) &&                  \
 292          !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
 293 #define LDO_MV(x)       (~UNSUP_MASK & (x))
 294
 295
 296 static const u16 VAUX1_VSEL_table[] = {
 297         UNSUP(1500), UNSUP(1800), 2500, 2800,
 298         3000, 3000, 3000, 3000,
 299 };
 300 static const u16 VAUX2_4030_VSEL_table[] = {
 301         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 302         1500, 1800, UNSUP(1850), 2500,
 303         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 304         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 305 };
 306 static const u16 VAUX2_VSEL_table[] = {
 307         1700, 1700, 1900, 1300,
 308         1500, 1800, 2000, 2500,
 309         2100, 2800, 2200, 2300,
 310         2400, 2400, 2400, 2400,
 311 };
 312 static const u16 VAUX3_VSEL_table[] = {
 313         1500, 1800, 2500, 2800,
 314         3000, 3000, 3000, 3000,
 315 };
 316 static const u16 VAUX4_VSEL_table[] = {
 317         700, 1000, 1200, UNSUP(1300),
 318         1500, 1800, UNSUP(1850), 2500,
 319         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 320         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 321 };
 322 static const u16 VMMC1_VSEL_table[] = {
 323         1850, 2850, 3000, 3150,
 324 };
 325 static const u16 VMMC2_VSEL_table[] = {
 326         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 327         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 328         2600, 2800, 2850, 3000,
 329         3150, 3150, 3150, 3150,
 330 };
 331 static const u16 VPLL1_VSEL_table[] = {
 332         1000, 1200, 1300, 1800,
 333         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 334 };
 335 static const u16 VPLL2_VSEL_table[] = {
 336         700, 1000, 1200, 1300,
 337         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 338         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 339         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 340 };
 341 static const u16 VSIM_VSEL_table[] = {
 342         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 343         2800, 3000, 3000, 3000,
 344 };
 345 static const u16 VDAC_VSEL_table[] = {
 346         1200, 1300, 1800, 1800,
 347 };
 348 static const u16 VIO_VSEL_table[] = {
 349         1800, 1850,
 350 };
 351 static const u16 VINTANA2_VSEL_table[] = {
 352         2500, 2750,
 353 };
 354
 355 /* 600mV to 1450mV in 12.5 mV steps */
 356 static const struct linear_range VDD1_ranges[] = {
 357         REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500)
 358 };
 359
 360 /* 600mV to 1450mV in 12.5 mV steps, everything above = 1500mV */
 361 static const struct linear_range VDD2_ranges[] = {
 362         REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500),
 363         REGULATOR_LINEAR_RANGE(1500000, 69, 69, 12500)
 364 };
 365
 366 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 367 {
 368         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 369         int                     mV = info->table[index];
 370
 371         return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000);
 372 }
 373
 374 static int
 375 twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
 376 {
 377         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 378
 379         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
 380                             selector);
 381 }
 382
 383 static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev)
 384 {
 385         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 386         int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);
 387
 388         if (vsel < 0)
 389                 return vsel;
 390
 391         vsel &= info->table_len - 1;
 392         return vsel;
 393 }
 394
 395 static const struct regulator_ops twl4030ldo_ops = {
 396         .list_voltage   = twl4030ldo_list_voltage,
 397
 398         .set_voltage_sel = twl4030ldo_set_voltage_sel,
 399         .get_voltage_sel = twl4030ldo_get_voltage_sel,
 400
 401         .enable         = twl4030reg_enable,
 402         .disable        = twl4030reg_disable,
 403         .is_enabled     = twl4030reg_is_enabled,
 404
 405         .set_mode       = twl4030reg_set_mode,
 406
 407         .get_status     = twl4030reg_get_status,
 408 };
 409
 410 static int
 411 twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
 412                         unsigned *selector)
 413 {
 414         struct twlreg_info *info = rdev_get_drvdata(rdev);
 415         int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
 416
 417         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel);
 418
 419         return 0;
 420 }
 421
 422 static int twl4030smps_get_voltage(struct regulator_dev *rdev)
 423 {
 424         struct twlreg_info *info = rdev_get_drvdata(rdev);
 425         int vsel;
 426
 427         vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 428                 VREG_VOLTAGE_SMPS_4030);
 429
 430         return vsel * 12500 + 600000;
 431 }
 432
 433 static const struct regulator_ops twl4030smps_ops = {
 434         .list_voltage   = regulator_list_voltage_linear_range,
 435
 436         .set_voltage    = twl4030smps_set_voltage,
 437         .get_voltage    = twl4030smps_get_voltage,
 438 };
 439
 440 /*----------------------------------------------------------------------*/
 441
 442 static const struct regulator_ops twl4030fixed_ops = {
 443         .list_voltage   = regulator_list_voltage_linear,
 444
 445         .enable         = twl4030reg_enable,
 446         .disable        = twl4030reg_disable,
 447         .is_enabled     = twl4030reg_is_enabled,
 448
 449         .set_mode       = twl4030reg_set_mode,
 450
 451         .get_status     = twl4030reg_get_status,
 452 };
 453
 454 /*----------------------------------------------------------------------*/
 455
 456 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
 457 static const struct twlreg_info TWL4030_INFO_##label = { \
 458         .base = offset, \
 459         .id = num, \
 460         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 461         .table = label##_VSEL_table, \
 462         .remap = remap_conf, \
 463         .desc = { \
 464                 .name = #label, \
 465                 .id = TWL4030_REG_##label, \
 466                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 467                 .ops = &twl4030ldo_ops, \
 468                 .type = REGULATOR_VOLTAGE, \
 469                 .owner = THIS_MODULE, \
 470                 .enable_time = turnon_delay, \
 471                 .of_map_mode = twl4030reg_map_mode, \
 472                 }, \
 473         }
 474
 475 #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf, \
 476                 n_volt) \
 477 static const struct twlreg_info TWL4030_INFO_##label = { \
 478         .base = offset, \
 479         .id = num, \
 480         .remap = remap_conf, \
 481         .desc = { \
 482                 .name = #label, \
 483                 .id = TWL4030_REG_##label, \
 484                 .ops = &twl4030smps_ops, \
 485                 .type = REGULATOR_VOLTAGE, \
 486                 .owner = THIS_MODULE, \
 487                 .enable_time = turnon_delay, \
 488                 .of_map_mode = twl4030reg_map_mode, \
 489                 .n_voltages = n_volt, \
 490                 .n_linear_ranges = ARRAY_SIZE(label ## _ranges), \
 491                 .linear_ranges = label ## _ranges, \
 492                 }, \
 493         }
 494
 495 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 496                         remap_conf) \
 497 static const struct twlreg_info TWLFIXED_INFO_##label = { \
 498         .base = offset, \
 499         .id = num, \
 500         .remap = remap_conf, \
 501         .desc = { \
 502                 .name = #label, \
 503                 .id = TWL4030##_REG_##label, \
 504                 .n_voltages = 1, \
 505                 .ops = &twl4030fixed_ops, \
 506                 .type = REGULATOR_VOLTAGE, \
 507                 .owner = THIS_MODULE, \
 508                 .min_uV = mVolts * 1000, \
 509                 .enable_time = turnon_delay, \
 510                 .of_map_mode = twl4030reg_map_mode, \
 511                 }, \
 512         }
 513
 514 /*
 515  * We list regulators here if systems need some level of
 516  * software control over them after boot.
 517  */
 518 TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
 519 TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
 520 TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
 521 TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
 522 TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
 523 TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
 524 TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
 525 TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
 526 TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
 527 TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
 528 TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
 529 TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
 530 TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
 531 TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08, 68);
 532 TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08, 69);
 533 /* VUSBCP is managed *only* by the USB subchip */
 534 TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
 535 TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
 536 TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
 537 TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
 538 TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);
 539
 540 #define TWL_OF_MATCH(comp, family, label) \
 541         { \
 542                 .compatible = comp, \
 543                 .data = &family##_INFO_##label, \
 544         }
 545
 546 #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
 547 #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
 548 #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
 549 #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
 550 #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)
 551
 552 static const struct of_device_id twl_of_match[] = {
 553         TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
 554         TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
 555         TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
 556         TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
 557         TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
 558         TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
 559         TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
 560         TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
 561         TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
 562         TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
 563         TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
 564         TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
 565         TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
 566         TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
 567         TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
 568         TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
 569         TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
 570         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
 571         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
 572         TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
 573         {},
 574 };
 575 MODULE_DEVICE_TABLE(of, twl_of_match);
 576
 577 static int twlreg_probe(struct platform_device *pdev)
 578 {
 579         int id;
 580         struct twlreg_info              *info;
 581         const struct twlreg_info        *template;
 582         struct regulator_init_data      *initdata;
 583         struct regulation_constraints   *c;
 584         struct regulator_dev            *rdev;
 585         struct regulator_config         config = { };
 586
 587         template = of_device_get_match_data(&pdev->dev);
 588         if (!template)
 589                 return -ENODEV;
 590
 591         id = template->desc.id;
 592         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
 593                                                 &template->desc);
 594         if (!initdata)
 595                 return -EINVAL;
 596
 597         info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
 598         if (!info)
 599                 return -ENOMEM;
 600
 601         /* Constrain board-specific capabilities according to what
 602          * this driver and the chip itself can actually do.
 603          */
 604         c = &initdata->constraints;
 605         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 606         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 607                                 | REGULATOR_CHANGE_MODE
 608                                 | REGULATOR_CHANGE_STATUS;
 609         switch (id) {
 610         case TWL4030_REG_VIO:
 611         case TWL4030_REG_VDD1:
 612         case TWL4030_REG_VDD2:
 613         case TWL4030_REG_VPLL1:
 614         case TWL4030_REG_VINTANA1:
 615         case TWL4030_REG_VINTANA2:
 616         case TWL4030_REG_VINTDIG:
 617                 c->always_on = true;
 618                 break;
 619         default:
 620                 break;
 621         }
 622
 623         config.dev = &pdev->dev;
 624         config.init_data = initdata;
 625         config.driver_data = info;
 626         config.of_node = pdev->dev.of_node;
 627
 628         rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
 629         if (IS_ERR(rdev)) {
 630                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 631                                 info->desc.name, PTR_ERR(rdev));
 632                 return PTR_ERR(rdev);
 633         }
 634         platform_set_drvdata(pdev, rdev);
 635
 636         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);
 637
 638         /* NOTE:  many regulators support short-circuit IRQs (presentable
 639          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 640          *  - SC_CONFIG
 641          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 642          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 643          *  - IT_CONFIG
 644          */
 645
 646         return 0;
 647 }
 648
 649 MODULE_ALIAS("platform:twl4030_reg");
 650
 651 static struct platform_driver twlreg_driver = {
 652         .probe          = twlreg_probe,
 653         /* NOTE: short name, to work around driver model truncation of
 654          * "twl_regulator.12" (and friends) to "twl_regulator.1".
 655          */
 656         .driver  = {
 657                 .name  = "twl4030_reg",
 658                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 659                 .of_match_table = of_match_ptr(twl_of_match),
 660         },
 661 };
 662
 663 static int __init twlreg_init(void)
 664 {
 665         return platform_driver_register(&twlreg_driver);
 666 }
 667 subsys_initcall(twlreg_init);
 668
 669 static void __exit twlreg_exit(void)
 670 {
 671         platform_driver_unregister(&twlreg_driver);
 672 }
 673 module_exit(twlreg_exit)
 674
 675 MODULE_DESCRIPTION("TWL4030 regulator driver");
 676 MODULE_LICENSE("GPL");