drivers/regulator/twl-regulator.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
0004  *
0005  * Copyright (C) 2008 David Brownell
0006  */
0007
0008 #include <linux/module.h>
0009 #include <linux/string.h>
0010 #include <linux/slab.h>
0011 #include <linux/init.h>
0012 #include <linux/err.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/of.h>
0015 #include <linux/of_device.h>
0016 #include <linux/regulator/driver.h>
0017 #include <linux/regulator/machine.h>
0018 #include <linux/regulator/of_regulator.h>
0019 #include <linux/mfd/twl.h>
0020 #include <linux/delay.h>
0021
0022 /*
0023  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
0024  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
0025  * include an audio codec, battery charger, and more voltage regulators.
0026  * These chips are often used in OMAP-based systems.
0027  *
0028  * This driver implements software-based resource control for various
0029  * voltage regulators.  This is usually augmented with state machine
0030  * based control.
0031  */
0032
0033 struct twlreg_info {
0034     /* start of regulator's PM_RECEIVER control register bank */
0035     u8          base;
0036
0037     /* twl resource ID, for resource control state machine */
0038     u8          id;
0039
0040     /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
0041     u8          table_len;
0042     const u16       *table;
0043
0044     /* State REMAP default configuration */
0045     u8          remap;
0046
0047     /* used by regulator core */
0048     struct regulator_desc   desc;
0049
0050     /* chip specific features */
0051     unsigned long       features;
0052
0053     /* data passed from board for external get/set voltage */
0054     void            *data;
0055 };
0056
0057
0058 /* LDO control registers ... offset is from the base of its register bank.
0059  * The first three registers of all power resource banks help hardware to
0060  * manage the various resource groups.
0061  */
0062 /* Common offset in TWL4030/6030 */
0063 #define VREG_GRP        0
0064 /* TWL4030 register offsets */
0065 #define VREG_TYPE       1
0066 #define VREG_REMAP      2
0067 #define VREG_DEDICATED      3   /* LDO control */
0068 #define VREG_VOLTAGE_SMPS_4030  9
0069 /* TWL6030 register offsets */
0070 #define VREG_TRANS      1
0071 #define VREG_STATE      2
0072 #define VREG_VOLTAGE        3
0073 #define VREG_VOLTAGE_SMPS   4
0074
0075 static inline int
0076 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
0077 {
0078     u8 value;
0079     int status;
0080
0081     status = twl_i2c_read_u8(slave_subgp,
0082             &value, info->base + offset);
0083     return (status < 0) ? status : value;
0084 }
0085
0086 static inline int
0087 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
0088                          u8 value)
0089 {
0090     return twl_i2c_write_u8(slave_subgp,
0091             value, info->base + offset);
0092 }
0093
0094 /*----------------------------------------------------------------------*/
0095
0096 /* generic power resource operations, which work on all regulators */
0097
0098 static int twlreg_grp(struct regulator_dev *rdev)
0099 {
0100     return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
0101                                  VREG_GRP);
0102 }
0103
0104 /*
0105  * Enable/disable regulators by joining/leaving the P1 (processor) group.
0106  * We assume nobody else is updating the DEV_GRP registers.
0107  */
0108 /* definition for 4030 family */
0109 #define P3_GRP_4030 BIT(7)      /* "peripherals" */
0110 #define P2_GRP_4030 BIT(6)      /* secondary processor, modem, etc */
0111 #define P1_GRP_4030 BIT(5)      /* CPU/Linux */
0112 /* definition for 6030 family */
0113 #define P3_GRP_6030 BIT(2)      /* secondary processor, modem, etc */
0114 #define P2_GRP_6030 BIT(1)      /* "peripherals" */
0115 #define P1_GRP_6030 BIT(0)      /* CPU/Linux */
0116
0117 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
0118 {
0119     int state = twlreg_grp(rdev);
0120
0121     if (state < 0)
0122         return state;
0123
0124     return state & P1_GRP_4030;
0125 }
0126
0127 #define PB_I2C_BUSY BIT(0)
0128 #define PB_I2C_BWEN BIT(1)
0129
0130 /* Wait until buffer empty/ready to send a word on power bus. */
0131 static int twl4030_wait_pb_ready(void)
0132 {
0133
0134     int ret;
0135     int timeout = 10;
0136     u8  val;
0137
0138     do {
0139         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
0140                       TWL4030_PM_MASTER_PB_CFG);
0141         if (ret < 0)
0142             return ret;
0143
0144         if (!(val & PB_I2C_BUSY))
0145             return 0;
0146
0147         mdelay(1);
0148         timeout--;
0149     } while (timeout);
0150
0151     return -ETIMEDOUT;
0152 }
0153
0154 /* Send a word over the powerbus */
0155 static int twl4030_send_pb_msg(unsigned msg)
0156 {
0157     u8  val;
0158     int ret;
0159
0160     /* save powerbus configuration */
0161     ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
0162                   TWL4030_PM_MASTER_PB_CFG);
0163     if (ret < 0)
0164         return ret;
0165
0166     /* Enable i2c access to powerbus */
0167     ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
0168                    TWL4030_PM_MASTER_PB_CFG);
0169     if (ret < 0)
0170         return ret;
0171
0172     ret = twl4030_wait_pb_ready();
0173     if (ret < 0)
0174         return ret;
0175
0176     ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
0177                    TWL4030_PM_MASTER_PB_WORD_MSB);
0178     if (ret < 0)
0179         return ret;
0180
0181     ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
0182                    TWL4030_PM_MASTER_PB_WORD_LSB);
0183     if (ret < 0)
0184         return ret;
0185
0186     ret = twl4030_wait_pb_ready();
0187     if (ret < 0)
0188         return ret;
0189
0190     /* Restore powerbus configuration */
0191     return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
0192                 TWL4030_PM_MASTER_PB_CFG);
0193 }
0194
0195 static int twl4030reg_enable(struct regulator_dev *rdev)
0196 {
0197     struct twlreg_info  *info = rdev_get_drvdata(rdev);
0198     int         grp;
0199
0200     grp = twlreg_grp(rdev);
0201     if (grp < 0)
0202         return grp;
0203
0204     grp |= P1_GRP_4030;
0205
0206     return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
0207 }
0208
0209 static int twl4030reg_disable(struct regulator_dev *rdev)
0210 {
0211     struct twlreg_info  *info = rdev_get_drvdata(rdev);
0212     int         grp;
0213
0214     grp = twlreg_grp(rdev);
0215     if (grp < 0)
0216         return grp;
0217
0218     grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
0219
0220     return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
0221 }
0222
0223 static int twl4030reg_get_status(struct regulator_dev *rdev)
0224 {
0225     int state = twlreg_grp(rdev);
0226
0227     if (state < 0)
0228         return state;
0229     state &= 0x0f;
0230
0231     /* assume state != WARM_RESET; we'd not be running...  */
0232     if (!state)
0233         return REGULATOR_STATUS_OFF;
0234     return (state & BIT(3))
0235         ? REGULATOR_STATUS_NORMAL
0236         : REGULATOR_STATUS_STANDBY;
0237 }
0238
0239 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
0240 {
0241     struct twlreg_info  *info = rdev_get_drvdata(rdev);
0242     unsigned        message;
0243
0244     /* We can only set the mode through state machine commands... */
0245     switch (mode) {
0246     case REGULATOR_MODE_NORMAL:
0247         message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
0248         break;
0249     case REGULATOR_MODE_STANDBY:
0250         message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
0251         break;
0252     default:
0253         return -EINVAL;
0254     }
0255
0256     return twl4030_send_pb_msg(message);
0257 }
0258
0259 static inline unsigned int twl4030reg_map_mode(unsigned int mode)
0260 {
0261     switch (mode) {
0262     case RES_STATE_ACTIVE:
0263         return REGULATOR_MODE_NORMAL;
0264     case RES_STATE_SLEEP:
0265         return REGULATOR_MODE_STANDBY;
0266     default:
0267         return REGULATOR_MODE_INVALID;
0268     }
0269 }
0270
0271 /*----------------------------------------------------------------------*/
0272
0273 /*
0274  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
0275  * select field in its control register.   We use tables indexed by VSEL
0276  * to record voltages in milliVolts.  (Accuracy is about three percent.)
0277  *
0278  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
0279  * currently handled by listing two slightly different VAUX2 regulators,
0280  * only one of which will be configured.
0281  *
0282  * VSEL values documented as "TI cannot support these values" are flagged
0283  * in these tables as UNSUP() values; we normally won't assign them.
0284  *
0285  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
0286  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
0287  */
0288 #define UNSUP_MASK  0x8000
0289
0290 #define UNSUP(x)    (UNSUP_MASK | (x))
0291 #define IS_UNSUP(info, x)           \
0292     ((UNSUP_MASK & (x)) &&          \
0293      !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
0294 #define LDO_MV(x)   (~UNSUP_MASK & (x))
0295
0296
0297 static const u16 VAUX1_VSEL_table[] = {
0298     UNSUP(1500), UNSUP(1800), 2500, 2800,
0299     3000, 3000, 3000, 3000,
0300 };
0301 static const u16 VAUX2_4030_VSEL_table[] = {
0302     UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
0303     1500, 1800, UNSUP(1850), 2500,
0304     UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
0305     UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
0306 };
0307 static const u16 VAUX2_VSEL_table[] = {
0308     1700, 1700, 1900, 1300,
0309     1500, 1800, 2000, 2500,
0310     2100, 2800, 2200, 2300,
0311     2400, 2400, 2400, 2400,
0312 };
0313 static const u16 VAUX3_VSEL_table[] = {
0314     1500, 1800, 2500, 2800,
0315     3000, 3000, 3000, 3000,
0316 };
0317 static const u16 VAUX4_VSEL_table[] = {
0318     700, 1000, 1200, UNSUP(1300),
0319     1500, 1800, UNSUP(1850), 2500,
0320     UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
0321     UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
0322 };
0323 static const u16 VMMC1_VSEL_table[] = {
0324     1850, 2850, 3000, 3150,
0325 };
0326 static const u16 VMMC2_VSEL_table[] = {
0327     UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
0328     UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
0329     2600, 2800, 2850, 3000,
0330     3150, 3150, 3150, 3150,
0331 };
0332 static const u16 VPLL1_VSEL_table[] = {
0333     1000, 1200, 1300, 1800,
0334     UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
0335 };
0336 static const u16 VPLL2_VSEL_table[] = {
0337     700, 1000, 1200, 1300,
0338     UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
0339     UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
0340     UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
0341 };
0342 static const u16 VSIM_VSEL_table[] = {
0343     UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
0344     2800, 3000, 3000, 3000,
0345 };
0346 static const u16 VDAC_VSEL_table[] = {
0347     1200, 1300, 1800, 1800,
0348 };
0349 static const u16 VIO_VSEL_table[] = {
0350     1800, 1850,
0351 };
0352 static const u16 VINTANA2_VSEL_table[] = {
0353     2500, 2750,
0354 };
0355
0356 /* 600mV to 1450mV in 12.5 mV steps */
0357 static const struct linear_range VDD1_ranges[] = {
0358     REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500)
0359 };
0360
0361 /* 600mV to 1450mV in 12.5 mV steps, everything above = 1500mV */
0362 static const struct linear_range VDD2_ranges[] = {
0363     REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500),
0364     REGULATOR_LINEAR_RANGE(1500000, 69, 69, 12500)
0365 };
0366
0367 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
0368 {
0369     struct twlreg_info  *info = rdev_get_drvdata(rdev);
0370     int         mV = info->table[index];
0371
0372     return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000);
0373 }
0374
0375 static int
0376 twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
0377 {
0378     struct twlreg_info  *info = rdev_get_drvdata(rdev);
0379
0380     return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
0381                 selector);
0382 }
0383
0384 static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev)
0385 {
0386     struct twlreg_info  *info = rdev_get_drvdata(rdev);
0387     int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);
0388
0389     if (vsel < 0)
0390         return vsel;
0391
0392     vsel &= info->table_len - 1;
0393     return vsel;
0394 }
0395
0396 static const struct regulator_ops twl4030ldo_ops = {
0397     .list_voltage   = twl4030ldo_list_voltage,
0398
0399     .set_voltage_sel = twl4030ldo_set_voltage_sel,
0400     .get_voltage_sel = twl4030ldo_get_voltage_sel,
0401
0402     .enable     = twl4030reg_enable,
0403     .disable    = twl4030reg_disable,
0404     .is_enabled = twl4030reg_is_enabled,
0405
0406     .set_mode   = twl4030reg_set_mode,
0407
0408     .get_status = twl4030reg_get_status,
0409 };
0410
0411 static int
0412 twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
0413             unsigned *selector)
0414 {
0415     struct twlreg_info *info = rdev_get_drvdata(rdev);
0416     int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
0417
0418     twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel);
0419
0420     return 0;
0421 }
0422
0423 static int twl4030smps_get_voltage(struct regulator_dev *rdev)
0424 {
0425     struct twlreg_info *info = rdev_get_drvdata(rdev);
0426     int vsel;
0427
0428     vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
0429         VREG_VOLTAGE_SMPS_4030);
0430
0431     return vsel * 12500 + 600000;
0432 }
0433
0434 static const struct regulator_ops twl4030smps_ops = {
0435     .list_voltage   = regulator_list_voltage_linear_range,
0436
0437     .set_voltage    = twl4030smps_set_voltage,
0438     .get_voltage    = twl4030smps_get_voltage,
0439 };
0440
0441 /*----------------------------------------------------------------------*/
0442
0443 static const struct regulator_ops twl4030fixed_ops = {
0444     .list_voltage   = regulator_list_voltage_linear,
0445
0446     .enable     = twl4030reg_enable,
0447     .disable    = twl4030reg_disable,
0448     .is_enabled = twl4030reg_is_enabled,
0449
0450     .set_mode   = twl4030reg_set_mode,
0451
0452     .get_status = twl4030reg_get_status,
0453 };
0454
0455 /*----------------------------------------------------------------------*/
0456
0457 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
0458 static const struct twlreg_info TWL4030_INFO_##label = { \
0459     .base = offset, \
0460     .id = num, \
0461     .table_len = ARRAY_SIZE(label##_VSEL_table), \
0462     .table = label##_VSEL_table, \
0463     .remap = remap_conf, \
0464     .desc = { \
0465         .name = #label, \
0466         .id = TWL4030_REG_##label, \
0467         .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
0468         .ops = &twl4030ldo_ops, \
0469         .type = REGULATOR_VOLTAGE, \
0470         .owner = THIS_MODULE, \
0471         .enable_time = turnon_delay, \
0472         .of_map_mode = twl4030reg_map_mode, \
0473         }, \
0474     }
0475
0476 #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf, \
0477         n_volt) \
0478 static const struct twlreg_info TWL4030_INFO_##label = { \
0479     .base = offset, \
0480     .id = num, \
0481     .remap = remap_conf, \
0482     .desc = { \
0483         .name = #label, \
0484         .id = TWL4030_REG_##label, \
0485         .ops = &twl4030smps_ops, \
0486         .type = REGULATOR_VOLTAGE, \
0487         .owner = THIS_MODULE, \
0488         .enable_time = turnon_delay, \
0489         .of_map_mode = twl4030reg_map_mode, \
0490         .n_voltages = n_volt, \
0491         .n_linear_ranges = ARRAY_SIZE(label ## _ranges), \
0492         .linear_ranges = label ## _ranges, \
0493         }, \
0494     }
0495
0496 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
0497             remap_conf) \
0498 static const struct twlreg_info TWLFIXED_INFO_##label = { \
0499     .base = offset, \
0500     .id = num, \
0501     .remap = remap_conf, \
0502     .desc = { \
0503         .name = #label, \
0504         .id = TWL4030##_REG_##label, \
0505         .n_voltages = 1, \
0506         .ops = &twl4030fixed_ops, \
0507         .type = REGULATOR_VOLTAGE, \
0508         .owner = THIS_MODULE, \
0509         .min_uV = mVolts * 1000, \
0510         .enable_time = turnon_delay, \
0511         .of_map_mode = twl4030reg_map_mode, \
0512         }, \
0513     }
0514
0515 /*
0516  * We list regulators here if systems need some level of
0517  * software control over them after boot.
0518  */
0519 TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
0520 TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
0521 TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
0522 TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
0523 TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
0524 TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
0525 TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
0526 TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
0527 TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
0528 TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
0529 TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
0530 TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
0531 TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
0532 TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08, 68);
0533 TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08, 69);
0534 /* VUSBCP is managed *only* by the USB subchip */
0535 TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
0536 TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
0537 TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
0538 TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
0539 TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);
0540
0541 #define TWL_OF_MATCH(comp, family, label) \
0542     { \
0543         .compatible = comp, \
0544         .data = &family##_INFO_##label, \
0545     }
0546
0547 #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
0548 #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
0549 #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
0550 #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
0551 #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)
0552
0553 static const struct of_device_id twl_of_match[] = {
0554     TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
0555     TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
0556     TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
0557     TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
0558     TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
0559     TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
0560     TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
0561     TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
0562     TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
0563     TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
0564     TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
0565     TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
0566     TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
0567     TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
0568     TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
0569     TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
0570     TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
0571     TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
0572     TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
0573     TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
0574     {},
0575 };
0576 MODULE_DEVICE_TABLE(of, twl_of_match);
0577
0578 static int twlreg_probe(struct platform_device *pdev)
0579 {
0580     int id;
0581     struct twlreg_info      *info;
0582     const struct twlreg_info    *template;
0583     struct regulator_init_data  *initdata;
0584     struct regulation_constraints   *c;
0585     struct regulator_dev        *rdev;
0586     struct regulator_config     config = { };
0587
0588     template = of_device_get_match_data(&pdev->dev);
0589     if (!template)
0590         return -ENODEV;
0591
0592     id = template->desc.id;
0593     initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
0594                         &template->desc);
0595     if (!initdata)
0596         return -EINVAL;
0597
0598     info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
0599     if (!info)
0600         return -ENOMEM;
0601
0602     /* Constrain board-specific capabilities according to what
0603      * this driver and the chip itself can actually do.
0604      */
0605     c = &initdata->constraints;
0606     c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
0607     c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
0608                 | REGULATOR_CHANGE_MODE
0609                 | REGULATOR_CHANGE_STATUS;
0610     switch (id) {
0611     case TWL4030_REG_VIO:
0612     case TWL4030_REG_VDD1:
0613     case TWL4030_REG_VDD2:
0614     case TWL4030_REG_VPLL1:
0615     case TWL4030_REG_VINTANA1:
0616     case TWL4030_REG_VINTANA2:
0617     case TWL4030_REG_VINTDIG:
0618         c->always_on = true;
0619         break;
0620     default:
0621         break;
0622     }
0623
0624     config.dev = &pdev->dev;
0625     config.init_data = initdata;
0626     config.driver_data = info;
0627     config.of_node = pdev->dev.of_node;
0628
0629     rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
0630     if (IS_ERR(rdev)) {
0631         dev_err(&pdev->dev, "can't register %s, %ld\n",
0632                 info->desc.name, PTR_ERR(rdev));
0633         return PTR_ERR(rdev);
0634     }
0635     platform_set_drvdata(pdev, rdev);
0636
0637     twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);
0638
0639     /* NOTE:  many regulators support short-circuit IRQs (presentable
0640      * as REGULATOR_OVER_CURRENT notifications?) configured via:
0641      *  - SC_CONFIG
0642      *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
0643      *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
0644      *  - IT_CONFIG
0645      */
0646
0647     return 0;
0648 }
0649
0650 MODULE_ALIAS("platform:twl4030_reg");
0651
0652 static struct platform_driver twlreg_driver = {
0653     .probe      = twlreg_probe,
0654     /* NOTE: short name, to work around driver model truncation of
0655      * "twl_regulator.12" (and friends) to "twl_regulator.1".
0656      */
0657     .driver  = {
0658         .name  = "twl4030_reg",
0659         .of_match_table = of_match_ptr(twl_of_match),
0660     },
0661 };
0662
0663 static int __init twlreg_init(void)
0664 {
0665     return platform_driver_register(&twlreg_driver);
0666 }
0667 subsys_initcall(twlreg_init);
0668
0669 static void __exit twlreg_exit(void)
0670 {
0671     platform_driver_unregister(&twlreg_driver);
0672 }
0673 module_exit(twlreg_exit)
0674
0675 MODULE_DESCRIPTION("TWL4030 regulator driver");
0676 MODULE_LICENSE("GPL");