1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
4  *
5  * Copyright (C) 2008 David Brownell
6  */
7 
8 #include <linux/module.h>
9 #include <linux/string.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/platform_device.h>
14 #include <linux/of.h>
15 #include <linux/of_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/regulator/of_regulator.h>
19 #include <linux/mfd/twl.h>
20 #include <linux/delay.h>
21 
22 /*
23  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
24  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
25  * include an audio codec, battery charger, and more voltage regulators.
26  * These chips are often used in OMAP-based systems.
27  *
28  * This driver implements software-based resource control for various
29  * voltage regulators.  This is usually augmented with state machine
30  * based control.
31  */
32 
33 struct twlreg_info {
34 	/* start of regulator's PM_RECEIVER control register bank */
35 	u8			base;
36 
37 	/* twl resource ID, for resource control state machine */
38 	u8			id;
39 
40 	/* voltage in mV = table[VSEL]; table_len must be a power-of-two */
41 	u8			table_len;
42 	const u16		*table;
43 
44 	/* State REMAP default configuration */
45 	u8			remap;
46 
47 	/* used by regulator core */
48 	struct regulator_desc	desc;
49 
50 	/* chip specific features */
51 	unsigned long		features;
52 
53 	/* data passed from board for external get/set voltage */
54 	void			*data;
55 };
56 
57 
58 /* LDO control registers ... offset is from the base of its register bank.
59  * The first three registers of all power resource banks help hardware to
60  * manage the various resource groups.
61  */
62 /* Common offset in TWL4030/6030 */
63 #define VREG_GRP		0
64 /* TWL4030 register offsets */
65 #define VREG_TYPE		1
66 #define VREG_REMAP		2
67 #define VREG_DEDICATED		3	/* LDO control */
68 #define VREG_VOLTAGE_SMPS_4030	9
69 /* TWL6030 register offsets */
70 #define VREG_TRANS		1
71 #define VREG_STATE		2
72 #define VREG_VOLTAGE		3
73 #define VREG_VOLTAGE_SMPS	4
74 
75 static inline int
76 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
77 {
78 	u8 value;
79 	int status;
80 
81 	status = twl_i2c_read_u8(slave_subgp,
82 			&value, info->base + offset);
83 	return (status < 0) ? status : value;
84 }
85 
86 static inline int
87 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
88 						 u8 value)
89 {
90 	return twl_i2c_write_u8(slave_subgp,
91 			value, info->base + offset);
92 }
93 
94 /*----------------------------------------------------------------------*/
95 
96 /* generic power resource operations, which work on all regulators */
97 
98 static int twlreg_grp(struct regulator_dev *rdev)
99 {
100 	return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
101 								 VREG_GRP);
102 }
103 
104 /*
105  * Enable/disable regulators by joining/leaving the P1 (processor) group.
106  * We assume nobody else is updating the DEV_GRP registers.
107  */
108 /* definition for 4030 family */
109 #define P3_GRP_4030	BIT(7)		/* "peripherals" */
110 #define P2_GRP_4030	BIT(6)		/* secondary processor, modem, etc */
111 #define P1_GRP_4030	BIT(5)		/* CPU/Linux */
112 /* definition for 6030 family */
113 #define P3_GRP_6030	BIT(2)		/* secondary processor, modem, etc */
114 #define P2_GRP_6030	BIT(1)		/* "peripherals" */
115 #define P1_GRP_6030	BIT(0)		/* CPU/Linux */
116 
117 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
118 {
119 	int	state = twlreg_grp(rdev);
120 
121 	if (state < 0)
122 		return state;
123 
124 	return state & P1_GRP_4030;
125 }
126 
127 #define PB_I2C_BUSY	BIT(0)
128 #define PB_I2C_BWEN	BIT(1)
129 
130 /* Wait until buffer empty/ready to send a word on power bus. */
131 static int twl4030_wait_pb_ready(void)
132 {
133 
134 	int	ret;
135 	int	timeout = 10;
136 	u8	val;
137 
138 	do {
139 		ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
140 				      TWL4030_PM_MASTER_PB_CFG);
141 		if (ret < 0)
142 			return ret;
143 
144 		if (!(val & PB_I2C_BUSY))
145 			return 0;
146 
147 		mdelay(1);
148 		timeout--;
149 	} while (timeout);
150 
151 	return -ETIMEDOUT;
152 }
153 
154 /* Send a word over the powerbus */
155 static int twl4030_send_pb_msg(unsigned msg)
156 {
157 	u8	val;
158 	int	ret;
159 
160 	/* save powerbus configuration */
161 	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
162 			      TWL4030_PM_MASTER_PB_CFG);
163 	if (ret < 0)
164 		return ret;
165 
166 	/* Enable i2c access to powerbus */
167 	ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
168 			       TWL4030_PM_MASTER_PB_CFG);
169 	if (ret < 0)
170 		return ret;
171 
172 	ret = twl4030_wait_pb_ready();
173 	if (ret < 0)
174 		return ret;
175 
176 	ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
177 			       TWL4030_PM_MASTER_PB_WORD_MSB);
178 	if (ret < 0)
179 		return ret;
180 
181 	ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
182 			       TWL4030_PM_MASTER_PB_WORD_LSB);
183 	if (ret < 0)
184 		return ret;
185 
186 	ret = twl4030_wait_pb_ready();
187 	if (ret < 0)
188 		return ret;
189 
190 	/* Restore powerbus configuration */
191 	return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
192 				TWL4030_PM_MASTER_PB_CFG);
193 }
194 
195 static int twl4030reg_enable(struct regulator_dev *rdev)
196 {
197 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
198 	int			grp;
199 	int			ret;
200 
201 	grp = twlreg_grp(rdev);
202 	if (grp < 0)
203 		return grp;
204 
205 	grp |= P1_GRP_4030;
206 
207 	ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
208 
209 	return ret;
210 }
211 
212 static int twl4030reg_disable(struct regulator_dev *rdev)
213 {
214 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
215 	int			grp;
216 	int			ret;
217 
218 	grp = twlreg_grp(rdev);
219 	if (grp < 0)
220 		return grp;
221 
222 	grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
223 
224 	ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
225 
226 	return ret;
227 }
228 
229 static int twl4030reg_get_status(struct regulator_dev *rdev)
230 {
231 	int	state = twlreg_grp(rdev);
232 
233 	if (state < 0)
234 		return state;
235 	state &= 0x0f;
236 
237 	/* assume state != WARM_RESET; we'd not be running...  */
238 	if (!state)
239 		return REGULATOR_STATUS_OFF;
240 	return (state & BIT(3))
241 		? REGULATOR_STATUS_NORMAL
242 		: REGULATOR_STATUS_STANDBY;
243 }
244 
245 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
246 {
247 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
248 	unsigned		message;
249 
250 	/* We can only set the mode through state machine commands... */
251 	switch (mode) {
252 	case REGULATOR_MODE_NORMAL:
253 		message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
254 		break;
255 	case REGULATOR_MODE_STANDBY:
256 		message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
257 		break;
258 	default:
259 		return -EINVAL;
260 	}
261 
262 	return twl4030_send_pb_msg(message);
263 }
264 
265 static inline unsigned int twl4030reg_map_mode(unsigned int mode)
266 {
267 	switch (mode) {
268 	case RES_STATE_ACTIVE:
269 		return REGULATOR_MODE_NORMAL;
270 	case RES_STATE_SLEEP:
271 		return REGULATOR_MODE_STANDBY;
272 	default:
273 		return REGULATOR_MODE_INVALID;
274 	}
275 }
276 
277 /*----------------------------------------------------------------------*/
278 
279 /*
280  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
281  * select field in its control register.   We use tables indexed by VSEL
282  * to record voltages in milliVolts.  (Accuracy is about three percent.)
283  *
284  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
285  * currently handled by listing two slightly different VAUX2 regulators,
286  * only one of which will be configured.
287  *
288  * VSEL values documented as "TI cannot support these values" are flagged
289  * in these tables as UNSUP() values; we normally won't assign them.
290  *
291  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
292  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
293  */
294 #define UNSUP_MASK	0x8000
295 
296 #define UNSUP(x)	(UNSUP_MASK | (x))
297 #define IS_UNSUP(info, x)			\
298 	((UNSUP_MASK & (x)) &&			\
299 	 !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
300 #define LDO_MV(x)	(~UNSUP_MASK & (x))
301 
302 
303 static const u16 VAUX1_VSEL_table[] = {
304 	UNSUP(1500), UNSUP(1800), 2500, 2800,
305 	3000, 3000, 3000, 3000,
306 };
307 static const u16 VAUX2_4030_VSEL_table[] = {
308 	UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
309 	1500, 1800, UNSUP(1850), 2500,
310 	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
311 	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
312 };
313 static const u16 VAUX2_VSEL_table[] = {
314 	1700, 1700, 1900, 1300,
315 	1500, 1800, 2000, 2500,
316 	2100, 2800, 2200, 2300,
317 	2400, 2400, 2400, 2400,
318 };
319 static const u16 VAUX3_VSEL_table[] = {
320 	1500, 1800, 2500, 2800,
321 	3000, 3000, 3000, 3000,
322 };
323 static const u16 VAUX4_VSEL_table[] = {
324 	700, 1000, 1200, UNSUP(1300),
325 	1500, 1800, UNSUP(1850), 2500,
326 	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
327 	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
328 };
329 static const u16 VMMC1_VSEL_table[] = {
330 	1850, 2850, 3000, 3150,
331 };
332 static const u16 VMMC2_VSEL_table[] = {
333 	UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
334 	UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
335 	2600, 2800, 2850, 3000,
336 	3150, 3150, 3150, 3150,
337 };
338 static const u16 VPLL1_VSEL_table[] = {
339 	1000, 1200, 1300, 1800,
340 	UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
341 };
342 static const u16 VPLL2_VSEL_table[] = {
343 	700, 1000, 1200, 1300,
344 	UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
345 	UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
346 	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
347 };
348 static const u16 VSIM_VSEL_table[] = {
349 	UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
350 	2800, 3000, 3000, 3000,
351 };
352 static const u16 VDAC_VSEL_table[] = {
353 	1200, 1300, 1800, 1800,
354 };
355 static const u16 VIO_VSEL_table[] = {
356 	1800, 1850,
357 };
358 static const u16 VINTANA2_VSEL_table[] = {
359 	2500, 2750,
360 };
361 
362 /* 600mV to 1450mV in 12.5 mV steps */
363 static const struct regulator_linear_range VDD1_ranges[] = {
364 	REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500)
365 };
366 
367 /* 600mV to 1450mV in 12.5 mV steps, everything above = 1500mV */
368 static const struct regulator_linear_range VDD2_ranges[] = {
369 	REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500),
370 	REGULATOR_LINEAR_RANGE(1500000, 69, 69, 12500)
371 };
372 
373 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
374 {
375 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
376 	int			mV = info->table[index];
377 
378 	return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000);
379 }
380 
381 static int
382 twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
383 {
384 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
385 
386 	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
387 			    selector);
388 }
389 
390 static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev)
391 {
392 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
393 	int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);
394 
395 	if (vsel < 0)
396 		return vsel;
397 
398 	vsel &= info->table_len - 1;
399 	return vsel;
400 }
401 
402 static const struct regulator_ops twl4030ldo_ops = {
403 	.list_voltage	= twl4030ldo_list_voltage,
404 
405 	.set_voltage_sel = twl4030ldo_set_voltage_sel,
406 	.get_voltage_sel = twl4030ldo_get_voltage_sel,
407 
408 	.enable		= twl4030reg_enable,
409 	.disable	= twl4030reg_disable,
410 	.is_enabled	= twl4030reg_is_enabled,
411 
412 	.set_mode	= twl4030reg_set_mode,
413 
414 	.get_status	= twl4030reg_get_status,
415 };
416 
417 static int
418 twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
419 			unsigned *selector)
420 {
421 	struct twlreg_info *info = rdev_get_drvdata(rdev);
422 	int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
423 
424 	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel);
425 
426 	return 0;
427 }
428 
429 static int twl4030smps_get_voltage(struct regulator_dev *rdev)
430 {
431 	struct twlreg_info *info = rdev_get_drvdata(rdev);
432 	int vsel;
433 
434 	vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
435 		VREG_VOLTAGE_SMPS_4030);
436 
437 	return vsel * 12500 + 600000;
438 }
439 
440 static const struct regulator_ops twl4030smps_ops = {
441 	.list_voltage   = regulator_list_voltage_linear_range,
442 
443 	.set_voltage	= twl4030smps_set_voltage,
444 	.get_voltage	= twl4030smps_get_voltage,
445 };
446 
447 /*----------------------------------------------------------------------*/
448 
449 static const struct regulator_ops twl4030fixed_ops = {
450 	.list_voltage	= regulator_list_voltage_linear,
451 
452 	.enable		= twl4030reg_enable,
453 	.disable	= twl4030reg_disable,
454 	.is_enabled	= twl4030reg_is_enabled,
455 
456 	.set_mode	= twl4030reg_set_mode,
457 
458 	.get_status	= twl4030reg_get_status,
459 };
460 
461 /*----------------------------------------------------------------------*/
462 
463 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
464 static const struct twlreg_info TWL4030_INFO_##label = { \
465 	.base = offset, \
466 	.id = num, \
467 	.table_len = ARRAY_SIZE(label##_VSEL_table), \
468 	.table = label##_VSEL_table, \
469 	.remap = remap_conf, \
470 	.desc = { \
471 		.name = #label, \
472 		.id = TWL4030_REG_##label, \
473 		.n_voltages = ARRAY_SIZE(label##_VSEL_table), \
474 		.ops = &twl4030ldo_ops, \
475 		.type = REGULATOR_VOLTAGE, \
476 		.owner = THIS_MODULE, \
477 		.enable_time = turnon_delay, \
478 		.of_map_mode = twl4030reg_map_mode, \
479 		}, \
480 	}
481 
482 #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf, \
483 		n_volt) \
484 static const struct twlreg_info TWL4030_INFO_##label = { \
485 	.base = offset, \
486 	.id = num, \
487 	.remap = remap_conf, \
488 	.desc = { \
489 		.name = #label, \
490 		.id = TWL4030_REG_##label, \
491 		.ops = &twl4030smps_ops, \
492 		.type = REGULATOR_VOLTAGE, \
493 		.owner = THIS_MODULE, \
494 		.enable_time = turnon_delay, \
495 		.of_map_mode = twl4030reg_map_mode, \
496 		.n_voltages = n_volt, \
497 		.n_linear_ranges = ARRAY_SIZE(label ## _ranges), \
498 		.linear_ranges = label ## _ranges, \
499 		}, \
500 	}
501 
502 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
503 			remap_conf) \
504 static const struct twlreg_info TWLFIXED_INFO_##label = { \
505 	.base = offset, \
506 	.id = num, \
507 	.remap = remap_conf, \
508 	.desc = { \
509 		.name = #label, \
510 		.id = TWL4030##_REG_##label, \
511 		.n_voltages = 1, \
512 		.ops = &twl4030fixed_ops, \
513 		.type = REGULATOR_VOLTAGE, \
514 		.owner = THIS_MODULE, \
515 		.min_uV = mVolts * 1000, \
516 		.enable_time = turnon_delay, \
517 		.of_map_mode = twl4030reg_map_mode, \
518 		}, \
519 	}
520 
521 /*
522  * We list regulators here if systems need some level of
523  * software control over them after boot.
524  */
525 TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
526 TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
527 TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
528 TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
529 TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
530 TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
531 TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
532 TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
533 TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
534 TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
535 TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
536 TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
537 TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
538 TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08, 68);
539 TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08, 69);
540 /* VUSBCP is managed *only* by the USB subchip */
541 TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
542 TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
543 TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
544 TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
545 TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);
546 
547 #define TWL_OF_MATCH(comp, family, label) \
548 	{ \
549 		.compatible = comp, \
550 		.data = &family##_INFO_##label, \
551 	}
552 
553 #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
554 #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
555 #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
556 #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
557 #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)
558 
559 static const struct of_device_id twl_of_match[] = {
560 	TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
561 	TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
562 	TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
563 	TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
564 	TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
565 	TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
566 	TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
567 	TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
568 	TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
569 	TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
570 	TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
571 	TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
572 	TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
573 	TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
574 	TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
575 	TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
576 	TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
577 	TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
578 	TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
579 	TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
580 	{},
581 };
582 MODULE_DEVICE_TABLE(of, twl_of_match);
583 
584 static int twlreg_probe(struct platform_device *pdev)
585 {
586 	int id;
587 	struct twlreg_info		*info;
588 	const struct twlreg_info	*template;
589 	struct regulator_init_data	*initdata;
590 	struct regulation_constraints	*c;
591 	struct regulator_dev		*rdev;
592 	struct regulator_config		config = { };
593 
594 	template = of_device_get_match_data(&pdev->dev);
595 	if (!template)
596 		return -ENODEV;
597 
598 	id = template->desc.id;
599 	initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
600 						&template->desc);
601 	if (!initdata)
602 		return -EINVAL;
603 
604 	info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
605 	if (!info)
606 		return -ENOMEM;
607 
608 	/* Constrain board-specific capabilities according to what
609 	 * this driver and the chip itself can actually do.
610 	 */
611 	c = &initdata->constraints;
612 	c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
613 	c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
614 				| REGULATOR_CHANGE_MODE
615 				| REGULATOR_CHANGE_STATUS;
616 	switch (id) {
617 	case TWL4030_REG_VIO:
618 	case TWL4030_REG_VDD1:
619 	case TWL4030_REG_VDD2:
620 	case TWL4030_REG_VPLL1:
621 	case TWL4030_REG_VINTANA1:
622 	case TWL4030_REG_VINTANA2:
623 	case TWL4030_REG_VINTDIG:
624 		c->always_on = true;
625 		break;
626 	default:
627 		break;
628 	}
629 
630 	config.dev = &pdev->dev;
631 	config.init_data = initdata;
632 	config.driver_data = info;
633 	config.of_node = pdev->dev.of_node;
634 
635 	rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
636 	if (IS_ERR(rdev)) {
637 		dev_err(&pdev->dev, "can't register %s, %ld\n",
638 				info->desc.name, PTR_ERR(rdev));
639 		return PTR_ERR(rdev);
640 	}
641 	platform_set_drvdata(pdev, rdev);
642 
643 	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);
644 
645 	/* NOTE:  many regulators support short-circuit IRQs (presentable
646 	 * as REGULATOR_OVER_CURRENT notifications?) configured via:
647 	 *  - SC_CONFIG
648 	 *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
649 	 *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
650 	 *  - IT_CONFIG
651 	 */
652 
653 	return 0;
654 }
655 
656 MODULE_ALIAS("platform:twl4030_reg");
657 
658 static struct platform_driver twlreg_driver = {
659 	.probe		= twlreg_probe,
660 	/* NOTE: short name, to work around driver model truncation of
661 	 * "twl_regulator.12" (and friends) to "twl_regulator.1".
662 	 */
663 	.driver  = {
664 		.name  = "twl4030_reg",
665 		.of_match_table = of_match_ptr(twl_of_match),
666 	},
667 };
668 
669 static int __init twlreg_init(void)
670 {
671 	return platform_driver_register(&twlreg_driver);
672 }
673 subsys_initcall(twlreg_init);
674 
675 static void __exit twlreg_exit(void)
676 {
677 	platform_driver_unregister(&twlreg_driver);
678 }
679 module_exit(twlreg_exit)
680 
681 MODULE_DESCRIPTION("TWL4030 regulator driver");
682 MODULE_LICENSE("GPL");
683