summaryrefslogtreecommitdiff
path: root/drivers/regulator/twl-regulator.c
blob: 5bacfcebf59aae514dc5ef511840faec484d6cd2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
 *
 * Copyright (C) 2008 David Brownell
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/twl.h>
#include <linux/delay.h>

/*
 * The TWL4030/TW5030/TPS659x0 family chips include power management, a
 * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
 * include an audio codec, battery charger, and more voltage regulators.
 * These chips are often used in OMAP-based systems.
 *
 * This driver implements software-based resource control for various
 * voltage regulators.  This is usually augmented with state machine
 * based control.
 */

struct twlreg_info {
	/* start of regulator's PM_RECEIVER control register bank */
	u8			base;

	/* twl resource ID, for resource control state machine */
	u8			id;

	/* voltage in mV = table[VSEL]; table_len must be a power-of-two */
	u8			table_len;
	const u16		*table;

	/* State REMAP default configuration */
	u8			remap;

	/* used by regulator core */
	struct regulator_desc	desc;

	/* chip specific features */
	unsigned long		features;

	/* data passed from board for external get/set voltage */
	void			*data;
};


/* LDO control registers ... offset is from the base of its register bank.
 * The first three registers of all power resource banks help hardware to
 * manage the various resource groups.
 */
/* Common offset in TWL4030/6030 */
#define VREG_GRP		0
/* TWL4030 register offsets */
#define VREG_TYPE		1
#define VREG_REMAP		2
#define VREG_DEDICATED		3	/* LDO control */
#define VREG_VOLTAGE_SMPS_4030	9
/* TWL6030 register offsets */
#define VREG_TRANS		1
#define VREG_STATE		2
#define VREG_VOLTAGE		3
#define VREG_VOLTAGE_SMPS	4

static inline int
twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
{
	u8 value;
	int status;

	status = twl_i2c_read_u8(slave_subgp,
			&value, info->base + offset);
	return (status < 0) ? status : value;
}

static inline int
twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
						 u8 value)
{
	return twl_i2c_write_u8(slave_subgp,
			value, info->base + offset);
}

/*----------------------------------------------------------------------*/

/* generic power resource operations, which work on all regulators */

static int twlreg_grp(struct regulator_dev *rdev)
{
	return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
								 VREG_GRP);
}

/*
 * Enable/disable regulators by joining/leaving the P1 (processor) group.
 * We assume nobody else is updating the DEV_GRP registers.
 */
/* definition for 4030 family */
#define P3_GRP_4030	BIT(7)		/* "peripherals" */
#define P2_GRP_4030	BIT(6)		/* secondary processor, modem, etc */
#define P1_GRP_4030	BIT(5)		/* CPU/Linux */
/* definition for 6030 family */
#define P3_GRP_6030	BIT(2)		/* secondary processor, modem, etc */
#define P2_GRP_6030	BIT(1)		/* "peripherals" */
#define P1_GRP_6030	BIT(0)		/* CPU/Linux */

static int twl4030reg_is_enabled(struct regulator_dev *rdev)
{
	int	state = twlreg_grp(rdev);

	if (state < 0)
		return state;

	return state & P1_GRP_4030;
}

#define PB_I2C_BUSY	BIT(0)
#define PB_I2C_BWEN	BIT(1)

/* Wait until buffer empty/ready to send a word on power bus. */
static int twl4030_wait_pb_ready(void)
{

	int	ret;
	int	timeout = 10;
	u8	val;

	do {
		ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
				      TWL4030_PM_MASTER_PB_CFG);
		if (ret < 0)
			return ret;

		if (!(val & PB_I2C_BUSY))
			return 0;

		mdelay(1);
		timeout--;
	} while (timeout);

	return -ETIMEDOUT;
}

/* Send a word over the powerbus */
static int twl4030_send_pb_msg(unsigned msg)
{
	u8	val;
	int	ret;

	/* save powerbus configuration */
	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
			      TWL4030_PM_MASTER_PB_CFG);
	if (ret < 0)
		return ret;

	/* Enable i2c access to powerbus */
	ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
			       TWL4030_PM_MASTER_PB_CFG);
	if (ret < 0)
		return ret;

	ret = twl4030_wait_pb_ready();
	if (ret < 0)
		return ret;

	ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
			       TWL4030_PM_MASTER_PB_WORD_MSB);
	if (ret < 0)
		return ret;

	ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
			       TWL4030_PM_MASTER_PB_WORD_LSB);
	if (ret < 0)
		return ret;

	ret = twl4030_wait_pb_ready();
	if (ret < 0)
		return ret;

	/* Restore powerbus configuration */
	return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
				TWL4030_PM_MASTER_PB_CFG);
}

static int twl4030reg_enable(struct regulator_dev *rdev)
{
	struct twlreg_info	*info = rdev_get_drvdata(rdev);
	int			grp;

	grp = twlreg_grp(rdev);
	if (grp < 0)
		return grp;

	grp |= P1_GRP_4030;

	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
}

static int twl4030reg_disable(struct regulator_dev *rdev)
{
	struct twlreg_info	*info = rdev_get_drvdata(rdev);
	int			grp;

	grp = twlreg_grp(rdev);
	if (grp < 0)
		return grp;

	grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);

	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
}

static int twl4030reg_get_status(struct regulator_dev *rdev)
{
	int	state = twlreg_grp(rdev);

	if (state < 0)
		return state;
	state &= 0x0f;

	/* assume state != WARM_RESET; we'd not be running...  */
	if (!state)
		return REGULATOR_STATUS_OFF;
	return (state & BIT(3))
		? REGULATOR_STATUS_NORMAL
		: REGULATOR_STATUS_STANDBY;
}

static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
{
	struct twlreg_info	*info = rdev_get_drvdata(rdev);
	unsigned		message;

	/* We can only set the mode through state machine commands... */
	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
		break;
	case REGULATOR_MODE_STANDBY:
		message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
		break;
	default:
		return -EINVAL;
	}

	return twl4030_send_pb_msg(message);
}

static inline unsigned int twl4030reg_map_mode(unsigned int mode)
{
	switch (mode) {
	case RES_STATE_ACTIVE:
		return REGULATOR_MODE_NORMAL;
	case RES_STATE_SLEEP:
		return REGULATOR_MODE_STANDBY;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

/*----------------------------------------------------------------------*/

/*
 * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 * select field in its control register.   We use tables indexed by VSEL
 * to record voltages in milliVolts.  (Accuracy is about three percent.)
 *
 * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 * currently handled by listing two slightly different VAUX2 regulators,
 * only one of which will be configured.
 *
 * VSEL values documented as "TI cannot support these values" are flagged
 * in these tables as UNSUP() values; we normally won't assign them.
 *
 * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
 * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
 */
#define UNSUP_MASK	0x8000

#define UNSUP(x)	(UNSUP_MASK | (x))
#define IS_UNSUP(info, x)			\
	((UNSUP_MASK & (x)) &&			\
	 !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
#define LDO_MV(x)	(~UNSUP_MASK & (x))


static const u16 VAUX1_VSEL_table[] = {
	UNSUP(1500), UNSUP(1800), 2500, 2800,
	3000, 3000, 3000, 3000,
};
static const u16 VAUX2_4030_VSEL_table[] = {
	UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
	1500, 1800, UNSUP(1850), 2500,
	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
};
static const u16 VAUX2_VSEL_table[] = {
	1700, 1700, 1900, 1300,
	1500, 1800, 2000, 2500,
	2100, 2800, 2200, 2300,
	2400, 2400, 2400, 2400,
};
static const u16 VAUX3_VSEL_table[] = {
	1500, 1800, 2500, 2800,
	3000, 3000, 3000, 3000,
};
static const u16 VAUX4_VSEL_table[] = {
	700, 1000, 1200, UNSUP(1300),
	1500, 1800, UNSUP(1850), 2500,
	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
};
static const u16 VMMC1_VSEL_table[] = {
	1850, 2850, 3000, 3150,
};
static const u16 VMMC2_VSEL_table[] = {
	UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
	UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
	2600, 2800, 2850, 3000,
	3150, 3150, 3150, 3150,
};
static const u16 VPLL1_VSEL_table[] = {
	1000, 1200, 1300, 1800,
	UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
};
static const u16 VPLL2_VSEL_table[] = {
	700, 1000, 1200, 1300,
	UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
	UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
};
static const u16 VSIM_VSEL_table[] = {
	UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
	2800, 3000, 3000, 3000,
};
static const u16 VDAC_VSEL_table[] = {
	1200, 1300, 1800, 1800,
};
static const u16 VIO_VSEL_table[] = {
	1800, 1850,
};
static const u16 VINTANA2_VSEL_table[] = {
	2500, 2750,
};

/* 600mV to 1450mV in 12.5 mV steps */
static const struct linear_range VDD1_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500)
};

/* 600mV to 1450mV in 12.5 mV steps, everything above = 1500mV */
static const struct linear_range VDD2_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500),
	REGULATOR_LINEAR_RANGE(1500000, 69, 69, 12500)
};

static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
{
	struct twlreg_info	*info = rdev_get_drvdata(rdev);
	int			mV = info->table[index];

	return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000);
}

static int
twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
	struct twlreg_info	*info = rdev_get_drvdata(rdev);

	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
			    selector);
}

static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev)
{
	struct twlreg_info	*info = rdev_get_drvdata(rdev);
	int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);

	if (vsel < 0)
		return vsel;

	vsel &= info->table_len - 1;
	return vsel;
}

static const struct regulator_ops twl4030ldo_ops = {
	.list_voltage	= twl4030ldo_list_voltage,

	.set_voltage_sel = twl4030ldo_set_voltage_sel,
	.get_voltage_sel = twl4030ldo_get_voltage_sel,

	.enable		= twl4030reg_enable,
	.disable	= twl4030reg_disable,
	.is_enabled	= twl4030reg_is_enabled,

	.set_mode	= twl4030reg_set_mode,

	.get_status	= twl4030reg_get_status,
};

static int
twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
			unsigned *selector)
{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);

	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel);

	return 0;
}

static int twl4030smps_get_voltage(struct regulator_dev *rdev)
{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int vsel;

	vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
		VREG_VOLTAGE_SMPS_4030);

	return vsel * 12500 + 600000;
}

static const struct regulator_ops twl4030smps_ops = {
	.list_voltage   = regulator_list_voltage_linear_range,

	.set_voltage	= twl4030smps_set_voltage,
	.get_voltage	= twl4030smps_get_voltage,
};

/*----------------------------------------------------------------------*/

static const struct regulator_ops twl4030fixed_ops = {
	.list_voltage	= regulator_list_voltage_linear,

	.enable		= twl4030reg_enable,
	.disable	= twl4030reg_disable,
	.is_enabled	= twl4030reg_is_enabled,

	.set_mode	= twl4030reg_set_mode,

	.get_status	= twl4030reg_get_status,
};

/*----------------------------------------------------------------------*/

#define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
static const struct twlreg_info TWL4030_INFO_##label = { \
	.base = offset, \
	.id = num, \
	.table_len = ARRAY_SIZE(label##_VSEL_table), \
	.table = label##_VSEL_table, \
	.remap = remap_conf, \
	.desc = { \
		.name = #label, \
		.id = TWL4030_REG_##label, \
		.n_voltages = ARRAY_SIZE(label##_VSEL_table), \
		.ops = &twl4030ldo_ops, \
		.type = REGULATOR_VOLTAGE, \
		.owner = THIS_MODULE, \
		.enable_time = turnon_delay, \
		.of_map_mode = twl4030reg_map_mode, \
		}, \
	}

#define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf, \
		n_volt) \
static const struct twlreg_info TWL4030_INFO_##label = { \
	.base = offset, \
	.id = num, \
	.remap = remap_conf, \
	.desc = { \
		.name = #label, \
		.id = TWL4030_REG_##label, \
		.ops = &twl4030smps_ops, \
		.type = REGULATOR_VOLTAGE, \
		.owner = THIS_MODULE, \
		.enable_time = turnon_delay, \
		.of_map_mode = twl4030reg_map_mode, \
		.n_voltages = n_volt, \
		.n_linear_ranges = ARRAY_SIZE(label ## _ranges), \
		.linear_ranges = label ## _ranges, \
		}, \
	}

#define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
			remap_conf) \
static const struct twlreg_info TWLFIXED_INFO_##label = { \
	.base = offset, \
	.id = num, \
	.remap = remap_conf, \
	.desc = { \
		.name = #label, \
		.id = TWL4030##_REG_##label, \
		.n_voltages = 1, \
		.ops = &twl4030fixed_ops, \
		.type = REGULATOR_VOLTAGE, \
		.owner = THIS_MODULE, \
		.min_uV = mVolts * 1000, \
		.enable_time = turnon_delay, \
		.of_map_mode = twl4030reg_map_mode, \
		}, \
	}

/*
 * We list regulators here if systems need some level of
 * software control over them after boot.
 */
TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08, 68);
TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08, 69);
/* VUSBCP is managed *only* by the USB subchip */
TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);

#define TWL_OF_MATCH(comp, family, label) \
	{ \
		.compatible = comp, \
		.data = &family##_INFO_##label, \
	}

#define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
#define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
#define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
#define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
#define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)

static const struct of_device_id twl_of_match[] = {
	TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
	TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
	TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
	TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
	TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
	TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
	TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
	TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
	TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
	TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
	TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
	TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
	TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
	TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
	TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
	TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
	TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
	TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
	TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
	TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
	{},
};
MODULE_DEVICE_TABLE(of, twl_of_match);

static int twlreg_probe(struct platform_device *pdev)
{
	int id;
	struct twlreg_info		*info;
	const struct twlreg_info	*template;
	struct regulator_init_data	*initdata;
	struct regulation_constraints	*c;
	struct regulator_dev		*rdev;
	struct regulator_config		config = { };

	template = of_device_get_match_data(&pdev->dev);
	if (!template)
		return -ENODEV;

	id = template->desc.id;
	initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
						&template->desc);
	if (!initdata)
		return -EINVAL;

	info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	/* Constrain board-specific capabilities according to what
	 * this driver and the chip itself can actually do.
	 */
	c = &initdata->constraints;
	c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
	c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
				| REGULATOR_CHANGE_MODE
				| REGULATOR_CHANGE_STATUS;
	switch (id) {
	case TWL4030_REG_VIO:
	case TWL4030_REG_VDD1:
	case TWL4030_REG_VDD2:
	case TWL4030_REG_VPLL1:
	case TWL4030_REG_VINTANA1:
	case TWL4030_REG_VINTANA2:
	case TWL4030_REG_VINTDIG:
		c->always_on = true;
		break;
	default:
		break;
	}

	config.dev = &pdev->dev;
	config.init_data = initdata;
	config.driver_data = info;
	config.of_node = pdev->dev.of_node;

	rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(&pdev->dev, "can't register %s, %ld\n",
				info->desc.name, PTR_ERR(rdev));
		return PTR_ERR(rdev);
	}
	platform_set_drvdata(pdev, rdev);

	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);

	/* NOTE:  many regulators support short-circuit IRQs (presentable
	 * as REGULATOR_OVER_CURRENT notifications?) configured via:
	 *  - SC_CONFIG
	 *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
	 *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
	 *  - IT_CONFIG
	 */

	return 0;
}

MODULE_ALIAS("platform:twl4030_reg");

static struct platform_driver twlreg_driver = {
	.probe		= twlreg_probe,
	/* NOTE: short name, to work around driver model truncation of
	 * "twl_regulator.12" (and friends) to "twl_regulator.1".
	 */
	.driver  = {
		.name  = "twl4030_reg",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.of_match_table = of_match_ptr(twl_of_match),
	},
};

static int __init twlreg_init(void)
{
	return platform_driver_register(&twlreg_driver);
}
subsys_initcall(twlreg_init);

static void __exit twlreg_exit(void)
{
	platform_driver_unregister(&twlreg_driver);
}
module_exit(twlreg_exit)

MODULE_DESCRIPTION("TWL4030 regulator driver");
MODULE_LICENSE("GPL");