drivers/regulator/twl-regulator.c

   1 /*
   2  * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
   3  *
   4  * Copyright (C) 2008 David Brownell
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/string.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/err.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/of.h>
  19 #include <linux/of_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/machine.h>
  22 #include <linux/regulator/of_regulator.h>
  23 #include <linux/mfd/twl.h>
  24 #include <linux/delay.h>
  25
  26 /*
  27  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
  28  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
  29  * include an audio codec, battery charger, and more voltage regulators.
  30  * These chips are often used in OMAP-based systems.
  31  *
  32  * This driver implements software-based resource control for various
  33  * voltage regulators.  This is usually augmented with state machine
  34  * based control.
  35  */
  36
  37 struct twlreg_info {
  38         /* start of regulator's PM_RECEIVER control register bank */
  39         u8                      base;
  40
  41         /* twl resource ID, for resource control state machine */
  42         u8                      id;
  43
  44         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
  45         u8                      table_len;
  46         const u16               *table;
  47
  48         /* State REMAP default configuration */
  49         u8                      remap;
  50
  51         /* used by regulator core */
  52         struct regulator_desc   desc;
  53
  54         /* chip specific features */
  55         unsigned long           features;
  56
  57         /* data passed from board for external get/set voltage */
  58         void                    *data;
  59 };
  60
  61
  62 /* LDO control registers ... offset is from the base of its register bank.
  63  * The first three registers of all power resource banks help hardware to
  64  * manage the various resource groups.
  65  */
  66 /* Common offset in TWL4030/6030 */
  67 #define VREG_GRP                0
  68 /* TWL4030 register offsets */
  69 #define VREG_TYPE               1
  70 #define VREG_REMAP              2
  71 #define VREG_DEDICATED          3       /* LDO control */
  72 #define VREG_VOLTAGE_SMPS_4030  9
  73 /* TWL6030 register offsets */
  74 #define VREG_TRANS              1
  75 #define VREG_STATE              2
  76 #define VREG_VOLTAGE            3
  77 #define VREG_VOLTAGE_SMPS       4
  78
  79 static inline int
  80 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
  81 {
  82         u8 value;
  83         int status;
  84
  85         status = twl_i2c_read_u8(slave_subgp,
  86                         &value, info->base + offset);
  87         return (status < 0) ? status : value;
  88 }
  89
  90 static inline int
  91 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
  92                                                  u8 value)
  93 {
  94         return twl_i2c_write_u8(slave_subgp,
  95                         value, info->base + offset);
  96 }
  97
  98 /*----------------------------------------------------------------------*/
  99
 100 /* generic power resource operations, which work on all regulators */
 101
 102 static int twlreg_grp(struct regulator_dev *rdev)
 103 {
 104         return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
 105                                                                  VREG_GRP);
 106 }
 107
 108 /*
 109  * Enable/disable regulators by joining/leaving the P1 (processor) group.
 110  * We assume nobody else is updating the DEV_GRP registers.
 111  */
 112 /* definition for 4030 family */
 113 #define P3_GRP_4030     BIT(7)          /* "peripherals" */
 114 #define P2_GRP_4030     BIT(6)          /* secondary processor, modem, etc */
 115 #define P1_GRP_4030     BIT(5)          /* CPU/Linux */
 116 /* definition for 6030 family */
 117 #define P3_GRP_6030     BIT(2)          /* secondary processor, modem, etc */
 118 #define P2_GRP_6030     BIT(1)          /* "peripherals" */
 119 #define P1_GRP_6030     BIT(0)          /* CPU/Linux */
 120
 121 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
 122 {
 123         int     state = twlreg_grp(rdev);
 124
 125         if (state < 0)
 126                 return state;
 127
 128         return state & P1_GRP_4030;
 129 }
 130
 131 #define PB_I2C_BUSY     BIT(0)
 132 #define PB_I2C_BWEN     BIT(1)
 133
 134 /* Wait until buffer empty/ready to send a word on power bus. */
 135 static int twl4030_wait_pb_ready(void)
 136 {
 137
 138         int     ret;
 139         int     timeout = 10;
 140         u8      val;
 141
 142         do {
 143                 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 144                                       TWL4030_PM_MASTER_PB_CFG);
 145                 if (ret < 0)
 146                         return ret;
 147
 148                 if (!(val & PB_I2C_BUSY))
 149                         return 0;
 150
 151                 mdelay(1);
 152                 timeout--;
 153         } while (timeout);
 154
 155         return -ETIMEDOUT;
 156 }
 157
 158 /* Send a word over the powerbus */
 159 static int twl4030_send_pb_msg(unsigned msg)
 160 {
 161         u8      val;
 162         int     ret;
 163
 164         /* save powerbus configuration */
 165         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 166                               TWL4030_PM_MASTER_PB_CFG);
 167         if (ret < 0)
 168                 return ret;
 169
 170         /* Enable i2c access to powerbus */
 171         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
 172                                TWL4030_PM_MASTER_PB_CFG);
 173         if (ret < 0)
 174                 return ret;
 175
 176         ret = twl4030_wait_pb_ready();
 177         if (ret < 0)
 178                 return ret;
 179
 180         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
 181                                TWL4030_PM_MASTER_PB_WORD_MSB);
 182         if (ret < 0)
 183                 return ret;
 184
 185         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
 186                                TWL4030_PM_MASTER_PB_WORD_LSB);
 187         if (ret < 0)
 188                 return ret;
 189
 190         ret = twl4030_wait_pb_ready();
 191         if (ret < 0)
 192                 return ret;
 193
 194         /* Restore powerbus configuration */
 195         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
 196                                 TWL4030_PM_MASTER_PB_CFG);
 197 }
 198
 199 static int twl4030reg_enable(struct regulator_dev *rdev)
 200 {
 201         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 202         int                     grp;
 203         int                     ret;
 204
 205         grp = twlreg_grp(rdev);
 206         if (grp < 0)
 207                 return grp;
 208
 209         grp |= P1_GRP_4030;
 210
 211         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 212
 213         return ret;
 214 }
 215
 216 static int twl4030reg_disable(struct regulator_dev *rdev)
 217 {
 218         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 219         int                     grp;
 220         int                     ret;
 221
 222         grp = twlreg_grp(rdev);
 223         if (grp < 0)
 224                 return grp;
 225
 226         grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
 227
 228         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 229
 230         return ret;
 231 }
 232
 233 static int twl4030reg_get_status(struct regulator_dev *rdev)
 234 {
 235         int     state = twlreg_grp(rdev);
 236
 237         if (state < 0)
 238                 return state;
 239         state &= 0x0f;
 240
 241         /* assume state != WARM_RESET; we'd not be running...  */
 242         if (!state)
 243                 return REGULATOR_STATUS_OFF;
 244         return (state & BIT(3))
 245                 ? REGULATOR_STATUS_NORMAL
 246                 : REGULATOR_STATUS_STANDBY;
 247 }
 248
 249 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
 250 {
 251         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 252         unsigned                message;
 253
 254         /* We can only set the mode through state machine commands... */
 255         switch (mode) {
 256         case REGULATOR_MODE_NORMAL:
 257                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 258                 break;
 259         case REGULATOR_MODE_STANDBY:
 260                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 261                 break;
 262         default:
 263                 return -EINVAL;
 264         }
 265
 266         return twl4030_send_pb_msg(message);
 267 }
 268
 269 static inline unsigned int twl4030reg_map_mode(unsigned int mode)
 270 {
 271         switch (mode) {
 272         case RES_STATE_ACTIVE:
 273                 return REGULATOR_MODE_NORMAL;
 274         case RES_STATE_SLEEP:
 275                 return REGULATOR_MODE_STANDBY;
 276         default:
 277                 return -EINVAL;
 278         }
 279 }
 280
 281 /*----------------------------------------------------------------------*/
 282
 283 /*
 284  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 285  * select field in its control register.   We use tables indexed by VSEL
 286  * to record voltages in milliVolts.  (Accuracy is about three percent.)
 287  *
 288  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 289  * currently handled by listing two slightly different VAUX2 regulators,
 290  * only one of which will be configured.
 291  *
 292  * VSEL values documented as "TI cannot support these values" are flagged
 293  * in these tables as UNSUP() values; we normally won't assign them.
 294  *
 295  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
 296  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
 297  */
 298 #define UNSUP_MASK      0x8000
 299
 300 #define UNSUP(x)        (UNSUP_MASK | (x))
 301 #define IS_UNSUP(info, x)                       \
 302         ((UNSUP_MASK & (x)) &&                  \
 303          !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
 304 #define LDO_MV(x)       (~UNSUP_MASK & (x))
 305
 306
 307 static const u16 VAUX1_VSEL_table[] = {
 308         UNSUP(1500), UNSUP(1800), 2500, 2800,
 309         3000, 3000, 3000, 3000,
 310 };
 311 static const u16 VAUX2_4030_VSEL_table[] = {
 312         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 313         1500, 1800, UNSUP(1850), 2500,
 314         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 315         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 316 };
 317 static const u16 VAUX2_VSEL_table[] = {
 318         1700, 1700, 1900, 1300,
 319         1500, 1800, 2000, 2500,
 320         2100, 2800, 2200, 2300,
 321         2400, 2400, 2400, 2400,
 322 };
 323 static const u16 VAUX3_VSEL_table[] = {
 324         1500, 1800, 2500, 2800,
 325         3000, 3000, 3000, 3000,
 326 };
 327 static const u16 VAUX4_VSEL_table[] = {
 328         700, 1000, 1200, UNSUP(1300),
 329         1500, 1800, UNSUP(1850), 2500,
 330         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 331         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 332 };
 333 static const u16 VMMC1_VSEL_table[] = {
 334         1850, 2850, 3000, 3150,
 335 };
 336 static const u16 VMMC2_VSEL_table[] = {
 337         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 338         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 339         2600, 2800, 2850, 3000,
 340         3150, 3150, 3150, 3150,
 341 };
 342 static const u16 VPLL1_VSEL_table[] = {
 343         1000, 1200, 1300, 1800,
 344         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 345 };
 346 static const u16 VPLL2_VSEL_table[] = {
 347         700, 1000, 1200, 1300,
 348         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 349         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 350         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 351 };
 352 static const u16 VSIM_VSEL_table[] = {
 353         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 354         2800, 3000, 3000, 3000,
 355 };
 356 static const u16 VDAC_VSEL_table[] = {
 357         1200, 1300, 1800, 1800,
 358 };
 359 static const u16 VIO_VSEL_table[] = {
 360         1800, 1850,
 361 };
 362 static const u16 VINTANA2_VSEL_table[] = {
 363         2500, 2750,
 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 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 struct regulator_ops twl4030smps_ops = {
 434         .set_voltage    = twl4030smps_set_voltage,
 435         .get_voltage    = twl4030smps_get_voltage,
 436 };
 437
 438 /*----------------------------------------------------------------------*/
 439
 440 static struct regulator_ops twl4030fixed_ops = {
 441         .list_voltage   = regulator_list_voltage_linear,
 442
 443         .enable         = twl4030reg_enable,
 444         .disable        = twl4030reg_disable,
 445         .is_enabled     = twl4030reg_is_enabled,
 446
 447         .set_mode       = twl4030reg_set_mode,
 448
 449         .get_status     = twl4030reg_get_status,
 450 };
 451
 452 /*----------------------------------------------------------------------*/
 453
 454 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
 455 static const struct twlreg_info TWL4030_INFO_##label = { \
 456         .base = offset, \
 457         .id = num, \
 458         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 459         .table = label##_VSEL_table, \
 460         .remap = remap_conf, \
 461         .desc = { \
 462                 .name = #label, \
 463                 .id = TWL4030_REG_##label, \
 464                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 465                 .ops = &twl4030ldo_ops, \
 466                 .type = REGULATOR_VOLTAGE, \
 467                 .owner = THIS_MODULE, \
 468                 .enable_time = turnon_delay, \
 469                 .of_map_mode = twl4030reg_map_mode, \
 470                 }, \
 471         }
 472
 473 #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf) \
 474 static const struct twlreg_info TWL4030_INFO_##label = { \
 475         .base = offset, \
 476         .id = num, \
 477         .remap = remap_conf, \
 478         .desc = { \
 479                 .name = #label, \
 480                 .id = TWL4030_REG_##label, \
 481                 .ops = &twl4030smps_ops, \
 482                 .type = REGULATOR_VOLTAGE, \
 483                 .owner = THIS_MODULE, \
 484                 .enable_time = turnon_delay, \
 485                 .of_map_mode = twl4030reg_map_mode, \
 486                 }, \
 487         }
 488
 489 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 490                         remap_conf) \
 491 static const struct twlreg_info TWLFIXED_INFO_##label = { \
 492         .base = offset, \
 493         .id = num, \
 494         .remap = remap_conf, \
 495         .desc = { \
 496                 .name = #label, \
 497                 .id = TWL4030##_REG_##label, \
 498                 .n_voltages = 1, \
 499                 .ops = &twl4030fixed_ops, \
 500                 .type = REGULATOR_VOLTAGE, \
 501                 .owner = THIS_MODULE, \
 502                 .min_uV = mVolts * 1000, \
 503                 .enable_time = turnon_delay, \
 504                 .of_map_mode = twl4030reg_map_mode, \
 505                 }, \
 506         }
 507
 508 /*
 509  * We list regulators here if systems need some level of
 510  * software control over them after boot.
 511  */
 512 TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
 513 TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
 514 TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
 515 TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
 516 TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
 517 TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
 518 TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
 519 TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
 520 TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
 521 TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
 522 TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
 523 TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
 524 TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
 525 TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08);
 526 TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08);
 527 /* VUSBCP is managed *only* by the USB subchip */
 528 TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
 529 TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
 530 TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
 531 TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
 532 TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);
 533
 534 #define TWL_OF_MATCH(comp, family, label) \
 535         { \
 536                 .compatible = comp, \
 537                 .data = &family##_INFO_##label, \
 538         }
 539
 540 #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
 541 #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
 542 #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
 543 #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
 544 #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)
 545
 546 static const struct of_device_id twl_of_match[] = {
 547         TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
 548         TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
 549         TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
 550         TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
 551         TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
 552         TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
 553         TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
 554         TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
 555         TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
 556         TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
 557         TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
 558         TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
 559         TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
 560         TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
 561         TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
 562         TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
 563         TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
 564         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
 565         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
 566         TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
 567         {},
 568 };
 569 MODULE_DEVICE_TABLE(of, twl_of_match);
 570
 571 static int twlreg_probe(struct platform_device *pdev)
 572 {
 573         int id;
 574         struct twlreg_info              *info;
 575         const struct twlreg_info        *template;
 576         struct regulator_init_data      *initdata;
 577         struct regulation_constraints   *c;
 578         struct regulator_dev            *rdev;
 579         const struct of_device_id       *match;
 580         struct regulator_config         config = { };
 581
 582         match = of_match_device(twl_of_match, &pdev->dev);
 583         if (!match)
 584                 return -ENODEV;
 585
 586         template = match->data;
 587         if (!template)
 588                 return -ENODEV;
 589
 590         id = template->desc.id;
 591         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
 592                                                 &template->desc);
 593         if (!initdata)
 594                 return -EINVAL;
 595
 596         info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
 597         if (!info)
 598                 return -ENOMEM;
 599
 600         /* Constrain board-specific capabilities according to what
 601          * this driver and the chip itself can actually do.
 602          */
 603         c = &initdata->constraints;
 604         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 605         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 606                                 | REGULATOR_CHANGE_MODE
 607                                 | REGULATOR_CHANGE_STATUS;
 608         switch (id) {
 609         case TWL4030_REG_VIO:
 610         case TWL4030_REG_VDD1:
 611         case TWL4030_REG_VDD2:
 612         case TWL4030_REG_VPLL1:
 613         case TWL4030_REG_VINTANA1:
 614         case TWL4030_REG_VINTANA2:
 615         case TWL4030_REG_VINTDIG:
 616                 c->always_on = true;
 617                 break;
 618         default:
 619                 break;
 620         }
 621
 622         config.dev = &pdev->dev;
 623         config.init_data = initdata;
 624         config.driver_data = info;
 625         config.of_node = pdev->dev.of_node;
 626
 627         rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
 628         if (IS_ERR(rdev)) {
 629                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 630                                 info->desc.name, PTR_ERR(rdev));
 631                 return PTR_ERR(rdev);
 632         }
 633         platform_set_drvdata(pdev, rdev);
 634
 635         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);
 636
 637         /* NOTE:  many regulators support short-circuit IRQs (presentable
 638          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 639          *  - SC_CONFIG
 640          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 641          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 642          *  - IT_CONFIG
 643          */
 644
 645         return 0;
 646 }
 647
 648 MODULE_ALIAS("platform:twl4030_reg");
 649
 650 static struct platform_driver twlreg_driver = {
 651         .probe          = twlreg_probe,
 652         /* NOTE: short name, to work around driver model truncation of
 653          * "twl_regulator.12" (and friends) to "twl_regulator.1".
 654          */
 655         .driver  = {
 656                 .name  = "twl4030_reg",
 657                 .of_match_table = of_match_ptr(twl_of_match),
 658         },
 659 };
 660
 661 static int __init twlreg_init(void)
 662 {
 663         return platform_driver_register(&twlreg_driver);
 664 }
 665 subsys_initcall(twlreg_init);
 666
 667 static void __exit twlreg_exit(void)
 668 {
 669         platform_driver_unregister(&twlreg_driver);
 670 }
 671 module_exit(twlreg_exit)
 672
 673 MODULE_DESCRIPTION("TWL4030 regulator driver");
 674 MODULE_LICENSE("GPL");