xref: /openbmc/linux/drivers/regulator/lp872x.c (revision 6774def6)
1 /*
2  * Copyright 2012 Texas Instruments
3  *
4  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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 version 2 as
8  * published by the Free Software Foundation.
9  *
10  */
11 
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/i2c.h>
15 #include <linux/regmap.h>
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/regulator/lp872x.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/platform_device.h>
21 #include <linux/of.h>
22 #include <linux/of_gpio.h>
23 #include <linux/regulator/of_regulator.h>
24 
25 /* Registers : LP8720/8725 shared */
26 #define LP872X_GENERAL_CFG		0x00
27 #define LP872X_LDO1_VOUT		0x01
28 #define LP872X_LDO2_VOUT		0x02
29 #define LP872X_LDO3_VOUT		0x03
30 #define LP872X_LDO4_VOUT		0x04
31 #define LP872X_LDO5_VOUT		0x05
32 
33 /* Registers : LP8720 */
34 #define LP8720_BUCK_VOUT1		0x06
35 #define LP8720_BUCK_VOUT2		0x07
36 #define LP8720_ENABLE			0x08
37 
38 /* Registers : LP8725 */
39 #define LP8725_LILO1_VOUT		0x06
40 #define LP8725_LILO2_VOUT		0x07
41 #define LP8725_BUCK1_VOUT1		0x08
42 #define LP8725_BUCK1_VOUT2		0x09
43 #define LP8725_BUCK2_VOUT1		0x0A
44 #define LP8725_BUCK2_VOUT2		0x0B
45 #define LP8725_BUCK_CTRL		0x0C
46 #define LP8725_LDO_CTRL			0x0D
47 
48 /* Mask/shift : LP8720/LP8725 shared */
49 #define LP872X_VOUT_M			0x1F
50 #define LP872X_START_DELAY_M		0xE0
51 #define LP872X_START_DELAY_S		5
52 #define LP872X_EN_LDO1_M		BIT(0)
53 #define LP872X_EN_LDO2_M		BIT(1)
54 #define LP872X_EN_LDO3_M		BIT(2)
55 #define LP872X_EN_LDO4_M		BIT(3)
56 #define LP872X_EN_LDO5_M		BIT(4)
57 
58 /* Mask/shift : LP8720 */
59 #define LP8720_TIMESTEP_S		0		/* Addr 00h */
60 #define LP8720_TIMESTEP_M		BIT(0)
61 #define LP8720_EXT_DVS_M		BIT(2)
62 #define LP8720_BUCK_FPWM_S		5		/* Addr 07h */
63 #define LP8720_BUCK_FPWM_M		BIT(5)
64 #define LP8720_EN_BUCK_M		BIT(5)		/* Addr 08h */
65 #define LP8720_DVS_SEL_M		BIT(7)
66 
67 /* Mask/shift : LP8725 */
68 #define LP8725_TIMESTEP_M		0xC0		/* Addr 00h */
69 #define LP8725_TIMESTEP_S		6
70 #define LP8725_BUCK1_EN_M		BIT(0)
71 #define LP8725_DVS1_M			BIT(2)
72 #define LP8725_DVS2_M			BIT(3)
73 #define LP8725_BUCK2_EN_M		BIT(4)
74 #define LP8725_BUCK_CL_M		0xC0		/* Addr 09h, 0Bh */
75 #define LP8725_BUCK_CL_S		6
76 #define LP8725_BUCK1_FPWM_S		1		/* Addr 0Ch */
77 #define LP8725_BUCK1_FPWM_M		BIT(1)
78 #define LP8725_BUCK2_FPWM_S		5
79 #define LP8725_BUCK2_FPWM_M		BIT(5)
80 #define LP8725_EN_LILO1_M		BIT(5)		/* Addr 0Dh */
81 #define LP8725_EN_LILO2_M		BIT(6)
82 
83 /* PWM mode */
84 #define LP872X_FORCE_PWM		1
85 #define LP872X_AUTO_PWM			0
86 
87 #define LP8720_NUM_REGULATORS		6
88 #define LP8725_NUM_REGULATORS		9
89 #define EXTERN_DVS_USED			0
90 #define MAX_DELAY			6
91 
92 /* Default DVS Mode */
93 #define LP8720_DEFAULT_DVS		0
94 #define LP8725_DEFAULT_DVS		BIT(2)
95 
96 /* dump registers in regmap-debugfs */
97 #define MAX_REGISTERS			0x0F
98 
99 enum lp872x_id {
100 	LP8720,
101 	LP8725,
102 };
103 
104 struct lp872x {
105 	struct regmap *regmap;
106 	struct device *dev;
107 	enum lp872x_id chipid;
108 	struct lp872x_platform_data *pdata;
109 	struct regulator_dev **regulators;
110 	int num_regulators;
111 	enum lp872x_dvs_state dvs_pin;
112 	int dvs_gpio;
113 };
114 
115 /* LP8720/LP8725 shared voltage table for LDOs */
116 static const unsigned int lp872x_ldo_vtbl[] = {
117 	1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000,
118 	1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000, 2000000,
119 	2100000, 2200000, 2300000, 2400000, 2500000, 2600000, 2650000, 2700000,
120 	2750000, 2800000, 2850000, 2900000, 2950000, 3000000, 3100000, 3300000,
121 };
122 
123 /* LP8720 LDO4 voltage table */
124 static const unsigned int lp8720_ldo4_vtbl[] = {
125 	 800000,  850000,  900000, 1000000, 1100000, 1200000, 1250000, 1300000,
126 	1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000,
127 	1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
128 	2400000, 2500000, 2600000, 2650000, 2700000, 2750000, 2800000, 2850000,
129 };
130 
131 /* LP8725 LILO(Low Input Low Output) voltage table */
132 static const unsigned int lp8725_lilo_vtbl[] = {
133 	 800000,  850000,  900000,  950000, 1000000, 1050000, 1100000, 1150000,
134 	1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
135 	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
136 	2600000, 2700000, 2800000, 2850000, 2900000, 3000000, 3100000, 3300000,
137 };
138 
139 /* LP8720 BUCK voltage table */
140 #define EXT_R		0	/* external resistor divider */
141 static const unsigned int lp8720_buck_vtbl[] = {
142 	  EXT_R,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
143 	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
144 	1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
145 	1950000, 2000000, 2050000, 2100000, 2150000, 2200000, 2250000, 2300000,
146 };
147 
148 /* LP8725 BUCK voltage table */
149 static const unsigned int lp8725_buck_vtbl[] = {
150 	 800000,  850000,  900000,  950000, 1000000, 1050000, 1100000, 1150000,
151 	1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
152 	1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
153 	2400000, 2500000, 2600000, 2700000, 2800000, 2850000, 2900000, 3000000,
154 };
155 
156 /* LP8725 BUCK current limit */
157 static const unsigned int lp8725_buck_uA[] = {
158 	460000, 780000, 1050000, 1370000,
159 };
160 
161 static int lp872x_read_byte(struct lp872x *lp, u8 addr, u8 *data)
162 {
163 	int ret;
164 	unsigned int val;
165 
166 	ret = regmap_read(lp->regmap, addr, &val);
167 	if (ret < 0) {
168 		dev_err(lp->dev, "failed to read 0x%.2x\n", addr);
169 		return ret;
170 	}
171 
172 	*data = (u8)val;
173 	return 0;
174 }
175 
176 static inline int lp872x_write_byte(struct lp872x *lp, u8 addr, u8 data)
177 {
178 	return regmap_write(lp->regmap, addr, data);
179 }
180 
181 static inline int lp872x_update_bits(struct lp872x *lp, u8 addr,
182 				unsigned int mask, u8 data)
183 {
184 	return regmap_update_bits(lp->regmap, addr, mask, data);
185 }
186 
187 static int lp872x_get_timestep_usec(struct lp872x *lp)
188 {
189 	enum lp872x_id chip = lp->chipid;
190 	u8 val, mask, shift;
191 	int *time_usec, size, ret;
192 	int lp8720_time_usec[] = { 25, 50 };
193 	int lp8725_time_usec[] = { 32, 64, 128, 256 };
194 
195 	switch (chip) {
196 	case LP8720:
197 		mask = LP8720_TIMESTEP_M;
198 		shift = LP8720_TIMESTEP_S;
199 		time_usec = &lp8720_time_usec[0];
200 		size = ARRAY_SIZE(lp8720_time_usec);
201 		break;
202 	case LP8725:
203 		mask = LP8725_TIMESTEP_M;
204 		shift = LP8725_TIMESTEP_S;
205 		time_usec = &lp8725_time_usec[0];
206 		size = ARRAY_SIZE(lp8725_time_usec);
207 		break;
208 	default:
209 		return -EINVAL;
210 	}
211 
212 	ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
213 	if (ret)
214 		return ret;
215 
216 	val = (val & mask) >> shift;
217 	if (val >= size)
218 		return -EINVAL;
219 
220 	return *(time_usec + val);
221 }
222 
223 static int lp872x_regulator_enable_time(struct regulator_dev *rdev)
224 {
225 	struct lp872x *lp = rdev_get_drvdata(rdev);
226 	enum lp872x_regulator_id rid = rdev_get_id(rdev);
227 	int time_step_us = lp872x_get_timestep_usec(lp);
228 	int ret;
229 	u8 addr, val;
230 
231 	if (time_step_us < 0)
232 		return time_step_us;
233 
234 	switch (rid) {
235 	case LP8720_ID_LDO1 ... LP8720_ID_BUCK:
236 		addr = LP872X_LDO1_VOUT + rid;
237 		break;
238 	case LP8725_ID_LDO1 ... LP8725_ID_BUCK1:
239 		addr = LP872X_LDO1_VOUT + rid - LP8725_ID_BASE;
240 		break;
241 	case LP8725_ID_BUCK2:
242 		addr = LP8725_BUCK2_VOUT1;
243 		break;
244 	default:
245 		return -EINVAL;
246 	}
247 
248 	ret = lp872x_read_byte(lp, addr, &val);
249 	if (ret)
250 		return ret;
251 
252 	val = (val & LP872X_START_DELAY_M) >> LP872X_START_DELAY_S;
253 
254 	return val > MAX_DELAY ? 0 : val * time_step_us;
255 }
256 
257 static void lp872x_set_dvs(struct lp872x *lp, enum lp872x_dvs_sel dvs_sel,
258 			int gpio)
259 {
260 	enum lp872x_dvs_state state;
261 
262 	state = dvs_sel == SEL_V1 ? DVS_HIGH : DVS_LOW;
263 	gpio_set_value(gpio, state);
264 	lp->dvs_pin = state;
265 }
266 
267 static u8 lp872x_select_buck_vout_addr(struct lp872x *lp,
268 				enum lp872x_regulator_id buck)
269 {
270 	u8 val, addr;
271 
272 	if (lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val))
273 		return 0;
274 
275 	switch (buck) {
276 	case LP8720_ID_BUCK:
277 		if (val & LP8720_EXT_DVS_M) {
278 			addr = (lp->dvs_pin == DVS_HIGH) ?
279 				LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
280 		} else {
281 			if (lp872x_read_byte(lp, LP8720_ENABLE, &val))
282 				return 0;
283 
284 			addr = val & LP8720_DVS_SEL_M ?
285 				LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
286 		}
287 		break;
288 	case LP8725_ID_BUCK1:
289 		if (val & LP8725_DVS1_M)
290 			addr = LP8725_BUCK1_VOUT1;
291 		else
292 			addr = (lp->dvs_pin == DVS_HIGH) ?
293 				LP8725_BUCK1_VOUT1 : LP8725_BUCK1_VOUT2;
294 		break;
295 	case LP8725_ID_BUCK2:
296 		addr =  val & LP8725_DVS2_M ?
297 			LP8725_BUCK2_VOUT1 : LP8725_BUCK2_VOUT2;
298 		break;
299 	default:
300 		return 0;
301 	}
302 
303 	return addr;
304 }
305 
306 static bool lp872x_is_valid_buck_addr(u8 addr)
307 {
308 	switch (addr) {
309 	case LP8720_BUCK_VOUT1:
310 	case LP8720_BUCK_VOUT2:
311 	case LP8725_BUCK1_VOUT1:
312 	case LP8725_BUCK1_VOUT2:
313 	case LP8725_BUCK2_VOUT1:
314 	case LP8725_BUCK2_VOUT2:
315 		return true;
316 	default:
317 		return false;
318 	}
319 }
320 
321 static int lp872x_buck_set_voltage_sel(struct regulator_dev *rdev,
322 					unsigned selector)
323 {
324 	struct lp872x *lp = rdev_get_drvdata(rdev);
325 	enum lp872x_regulator_id buck = rdev_get_id(rdev);
326 	u8 addr, mask = LP872X_VOUT_M;
327 	struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
328 
329 	if (dvs && gpio_is_valid(dvs->gpio))
330 		lp872x_set_dvs(lp, dvs->vsel, dvs->gpio);
331 
332 	addr = lp872x_select_buck_vout_addr(lp, buck);
333 	if (!lp872x_is_valid_buck_addr(addr))
334 		return -EINVAL;
335 
336 	return lp872x_update_bits(lp, addr, mask, selector);
337 }
338 
339 static int lp872x_buck_get_voltage_sel(struct regulator_dev *rdev)
340 {
341 	struct lp872x *lp = rdev_get_drvdata(rdev);
342 	enum lp872x_regulator_id buck = rdev_get_id(rdev);
343 	u8 addr, val;
344 	int ret;
345 
346 	addr = lp872x_select_buck_vout_addr(lp, buck);
347 	if (!lp872x_is_valid_buck_addr(addr))
348 		return -EINVAL;
349 
350 	ret = lp872x_read_byte(lp, addr, &val);
351 	if (ret)
352 		return ret;
353 
354 	return val & LP872X_VOUT_M;
355 }
356 
357 static int lp8725_buck_set_current_limit(struct regulator_dev *rdev,
358 					int min_uA, int max_uA)
359 {
360 	struct lp872x *lp = rdev_get_drvdata(rdev);
361 	enum lp872x_regulator_id buck = rdev_get_id(rdev);
362 	int i;
363 	u8 addr;
364 
365 	switch (buck) {
366 	case LP8725_ID_BUCK1:
367 		addr = LP8725_BUCK1_VOUT2;
368 		break;
369 	case LP8725_ID_BUCK2:
370 		addr = LP8725_BUCK2_VOUT2;
371 		break;
372 	default:
373 		return -EINVAL;
374 	}
375 
376 	for (i = ARRAY_SIZE(lp8725_buck_uA) - 1; i >= 0; i--) {
377 		if (lp8725_buck_uA[i] >= min_uA &&
378 			lp8725_buck_uA[i] <= max_uA)
379 			return lp872x_update_bits(lp, addr,
380 						  LP8725_BUCK_CL_M,
381 						  i << LP8725_BUCK_CL_S);
382 	}
383 
384 	return -EINVAL;
385 }
386 
387 static int lp8725_buck_get_current_limit(struct regulator_dev *rdev)
388 {
389 	struct lp872x *lp = rdev_get_drvdata(rdev);
390 	enum lp872x_regulator_id buck = rdev_get_id(rdev);
391 	u8 addr, val;
392 	int ret;
393 
394 	switch (buck) {
395 	case LP8725_ID_BUCK1:
396 		addr = LP8725_BUCK1_VOUT2;
397 		break;
398 	case LP8725_ID_BUCK2:
399 		addr = LP8725_BUCK2_VOUT2;
400 		break;
401 	default:
402 		return -EINVAL;
403 	}
404 
405 	ret = lp872x_read_byte(lp, addr, &val);
406 	if (ret)
407 		return ret;
408 
409 	val = (val & LP8725_BUCK_CL_M) >> LP8725_BUCK_CL_S;
410 
411 	return (val < ARRAY_SIZE(lp8725_buck_uA)) ?
412 			lp8725_buck_uA[val] : -EINVAL;
413 }
414 
415 static int lp872x_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
416 {
417 	struct lp872x *lp = rdev_get_drvdata(rdev);
418 	enum lp872x_regulator_id buck = rdev_get_id(rdev);
419 	u8 addr, mask, shift, val;
420 
421 	switch (buck) {
422 	case LP8720_ID_BUCK:
423 		addr = LP8720_BUCK_VOUT2;
424 		mask = LP8720_BUCK_FPWM_M;
425 		shift = LP8720_BUCK_FPWM_S;
426 		break;
427 	case LP8725_ID_BUCK1:
428 		addr = LP8725_BUCK_CTRL;
429 		mask = LP8725_BUCK1_FPWM_M;
430 		shift = LP8725_BUCK1_FPWM_S;
431 		break;
432 	case LP8725_ID_BUCK2:
433 		addr = LP8725_BUCK_CTRL;
434 		mask = LP8725_BUCK2_FPWM_M;
435 		shift = LP8725_BUCK2_FPWM_S;
436 		break;
437 	default:
438 		return -EINVAL;
439 	}
440 
441 	if (mode == REGULATOR_MODE_FAST)
442 		val = LP872X_FORCE_PWM << shift;
443 	else if (mode == REGULATOR_MODE_NORMAL)
444 		val = LP872X_AUTO_PWM << shift;
445 	else
446 		return -EINVAL;
447 
448 	return lp872x_update_bits(lp, addr, mask, val);
449 }
450 
451 static unsigned int lp872x_buck_get_mode(struct regulator_dev *rdev)
452 {
453 	struct lp872x *lp = rdev_get_drvdata(rdev);
454 	enum lp872x_regulator_id buck = rdev_get_id(rdev);
455 	u8 addr, mask, val;
456 	int ret;
457 
458 	switch (buck) {
459 	case LP8720_ID_BUCK:
460 		addr = LP8720_BUCK_VOUT2;
461 		mask = LP8720_BUCK_FPWM_M;
462 		break;
463 	case LP8725_ID_BUCK1:
464 		addr = LP8725_BUCK_CTRL;
465 		mask = LP8725_BUCK1_FPWM_M;
466 		break;
467 	case LP8725_ID_BUCK2:
468 		addr = LP8725_BUCK_CTRL;
469 		mask = LP8725_BUCK2_FPWM_M;
470 		break;
471 	default:
472 		return -EINVAL;
473 	}
474 
475 	ret = lp872x_read_byte(lp, addr, &val);
476 	if (ret)
477 		return ret;
478 
479 	return val & mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
480 }
481 
482 static struct regulator_ops lp872x_ldo_ops = {
483 	.list_voltage = regulator_list_voltage_table,
484 	.map_voltage = regulator_map_voltage_ascend,
485 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
486 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
487 	.enable = regulator_enable_regmap,
488 	.disable = regulator_disable_regmap,
489 	.is_enabled = regulator_is_enabled_regmap,
490 	.enable_time = lp872x_regulator_enable_time,
491 };
492 
493 static struct regulator_ops lp8720_buck_ops = {
494 	.list_voltage = regulator_list_voltage_table,
495 	.map_voltage = regulator_map_voltage_ascend,
496 	.set_voltage_sel = lp872x_buck_set_voltage_sel,
497 	.get_voltage_sel = lp872x_buck_get_voltage_sel,
498 	.enable = regulator_enable_regmap,
499 	.disable = regulator_disable_regmap,
500 	.is_enabled = regulator_is_enabled_regmap,
501 	.enable_time = lp872x_regulator_enable_time,
502 	.set_mode = lp872x_buck_set_mode,
503 	.get_mode = lp872x_buck_get_mode,
504 };
505 
506 static struct regulator_ops lp8725_buck_ops = {
507 	.list_voltage = regulator_list_voltage_table,
508 	.map_voltage = regulator_map_voltage_ascend,
509 	.set_voltage_sel = lp872x_buck_set_voltage_sel,
510 	.get_voltage_sel = lp872x_buck_get_voltage_sel,
511 	.enable = regulator_enable_regmap,
512 	.disable = regulator_disable_regmap,
513 	.is_enabled = regulator_is_enabled_regmap,
514 	.enable_time = lp872x_regulator_enable_time,
515 	.set_mode = lp872x_buck_set_mode,
516 	.get_mode = lp872x_buck_get_mode,
517 	.set_current_limit = lp8725_buck_set_current_limit,
518 	.get_current_limit = lp8725_buck_get_current_limit,
519 };
520 
521 static struct regulator_desc lp8720_regulator_desc[] = {
522 	{
523 		.name = "ldo1",
524 		.id = LP8720_ID_LDO1,
525 		.ops = &lp872x_ldo_ops,
526 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
527 		.volt_table = lp872x_ldo_vtbl,
528 		.type = REGULATOR_VOLTAGE,
529 		.owner = THIS_MODULE,
530 		.vsel_reg = LP872X_LDO1_VOUT,
531 		.vsel_mask = LP872X_VOUT_M,
532 		.enable_reg = LP8720_ENABLE,
533 		.enable_mask = LP872X_EN_LDO1_M,
534 	},
535 	{
536 		.name = "ldo2",
537 		.id = LP8720_ID_LDO2,
538 		.ops = &lp872x_ldo_ops,
539 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
540 		.volt_table = lp872x_ldo_vtbl,
541 		.type = REGULATOR_VOLTAGE,
542 		.owner = THIS_MODULE,
543 		.vsel_reg = LP872X_LDO2_VOUT,
544 		.vsel_mask = LP872X_VOUT_M,
545 		.enable_reg = LP8720_ENABLE,
546 		.enable_mask = LP872X_EN_LDO2_M,
547 	},
548 	{
549 		.name = "ldo3",
550 		.id = LP8720_ID_LDO3,
551 		.ops = &lp872x_ldo_ops,
552 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
553 		.volt_table = lp872x_ldo_vtbl,
554 		.type = REGULATOR_VOLTAGE,
555 		.owner = THIS_MODULE,
556 		.vsel_reg = LP872X_LDO3_VOUT,
557 		.vsel_mask = LP872X_VOUT_M,
558 		.enable_reg = LP8720_ENABLE,
559 		.enable_mask = LP872X_EN_LDO3_M,
560 	},
561 	{
562 		.name = "ldo4",
563 		.id = LP8720_ID_LDO4,
564 		.ops = &lp872x_ldo_ops,
565 		.n_voltages = ARRAY_SIZE(lp8720_ldo4_vtbl),
566 		.volt_table = lp8720_ldo4_vtbl,
567 		.type = REGULATOR_VOLTAGE,
568 		.owner = THIS_MODULE,
569 		.vsel_reg = LP872X_LDO4_VOUT,
570 		.vsel_mask = LP872X_VOUT_M,
571 		.enable_reg = LP8720_ENABLE,
572 		.enable_mask = LP872X_EN_LDO4_M,
573 	},
574 	{
575 		.name = "ldo5",
576 		.id = LP8720_ID_LDO5,
577 		.ops = &lp872x_ldo_ops,
578 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
579 		.volt_table = lp872x_ldo_vtbl,
580 		.type = REGULATOR_VOLTAGE,
581 		.owner = THIS_MODULE,
582 		.vsel_reg = LP872X_LDO5_VOUT,
583 		.vsel_mask = LP872X_VOUT_M,
584 		.enable_reg = LP8720_ENABLE,
585 		.enable_mask = LP872X_EN_LDO5_M,
586 	},
587 	{
588 		.name = "buck",
589 		.id = LP8720_ID_BUCK,
590 		.ops = &lp8720_buck_ops,
591 		.n_voltages = ARRAY_SIZE(lp8720_buck_vtbl),
592 		.volt_table = lp8720_buck_vtbl,
593 		.type = REGULATOR_VOLTAGE,
594 		.owner = THIS_MODULE,
595 		.enable_reg = LP8720_ENABLE,
596 		.enable_mask = LP8720_EN_BUCK_M,
597 	},
598 };
599 
600 static struct regulator_desc lp8725_regulator_desc[] = {
601 	{
602 		.name = "ldo1",
603 		.id = LP8725_ID_LDO1,
604 		.ops = &lp872x_ldo_ops,
605 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
606 		.volt_table = lp872x_ldo_vtbl,
607 		.type = REGULATOR_VOLTAGE,
608 		.owner = THIS_MODULE,
609 		.vsel_reg = LP872X_LDO1_VOUT,
610 		.vsel_mask = LP872X_VOUT_M,
611 		.enable_reg = LP8725_LDO_CTRL,
612 		.enable_mask = LP872X_EN_LDO1_M,
613 	},
614 	{
615 		.name = "ldo2",
616 		.id = LP8725_ID_LDO2,
617 		.ops = &lp872x_ldo_ops,
618 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
619 		.volt_table = lp872x_ldo_vtbl,
620 		.type = REGULATOR_VOLTAGE,
621 		.owner = THIS_MODULE,
622 		.vsel_reg = LP872X_LDO2_VOUT,
623 		.vsel_mask = LP872X_VOUT_M,
624 		.enable_reg = LP8725_LDO_CTRL,
625 		.enable_mask = LP872X_EN_LDO2_M,
626 	},
627 	{
628 		.name = "ldo3",
629 		.id = LP8725_ID_LDO3,
630 		.ops = &lp872x_ldo_ops,
631 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
632 		.volt_table = lp872x_ldo_vtbl,
633 		.type = REGULATOR_VOLTAGE,
634 		.owner = THIS_MODULE,
635 		.vsel_reg = LP872X_LDO3_VOUT,
636 		.vsel_mask = LP872X_VOUT_M,
637 		.enable_reg = LP8725_LDO_CTRL,
638 		.enable_mask = LP872X_EN_LDO3_M,
639 	},
640 	{
641 		.name = "ldo4",
642 		.id = LP8725_ID_LDO4,
643 		.ops = &lp872x_ldo_ops,
644 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
645 		.volt_table = lp872x_ldo_vtbl,
646 		.type = REGULATOR_VOLTAGE,
647 		.owner = THIS_MODULE,
648 		.vsel_reg = LP872X_LDO4_VOUT,
649 		.vsel_mask = LP872X_VOUT_M,
650 		.enable_reg = LP8725_LDO_CTRL,
651 		.enable_mask = LP872X_EN_LDO4_M,
652 	},
653 	{
654 		.name = "ldo5",
655 		.id = LP8725_ID_LDO5,
656 		.ops = &lp872x_ldo_ops,
657 		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
658 		.volt_table = lp872x_ldo_vtbl,
659 		.type = REGULATOR_VOLTAGE,
660 		.owner = THIS_MODULE,
661 		.vsel_reg = LP872X_LDO5_VOUT,
662 		.vsel_mask = LP872X_VOUT_M,
663 		.enable_reg = LP8725_LDO_CTRL,
664 		.enable_mask = LP872X_EN_LDO5_M,
665 	},
666 	{
667 		.name = "lilo1",
668 		.id = LP8725_ID_LILO1,
669 		.ops = &lp872x_ldo_ops,
670 		.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
671 		.volt_table = lp8725_lilo_vtbl,
672 		.type = REGULATOR_VOLTAGE,
673 		.owner = THIS_MODULE,
674 		.vsel_reg = LP8725_LILO1_VOUT,
675 		.vsel_mask = LP872X_VOUT_M,
676 		.enable_reg = LP8725_LDO_CTRL,
677 		.enable_mask = LP8725_EN_LILO1_M,
678 	},
679 	{
680 		.name = "lilo2",
681 		.id = LP8725_ID_LILO2,
682 		.ops = &lp872x_ldo_ops,
683 		.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
684 		.volt_table = lp8725_lilo_vtbl,
685 		.type = REGULATOR_VOLTAGE,
686 		.owner = THIS_MODULE,
687 		.vsel_reg = LP8725_LILO2_VOUT,
688 		.vsel_mask = LP872X_VOUT_M,
689 		.enable_reg = LP8725_LDO_CTRL,
690 		.enable_mask = LP8725_EN_LILO2_M,
691 	},
692 	{
693 		.name = "buck1",
694 		.id = LP8725_ID_BUCK1,
695 		.ops = &lp8725_buck_ops,
696 		.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
697 		.volt_table = lp8725_buck_vtbl,
698 		.type = REGULATOR_VOLTAGE,
699 		.owner = THIS_MODULE,
700 		.enable_reg = LP872X_GENERAL_CFG,
701 		.enable_mask = LP8725_BUCK1_EN_M,
702 	},
703 	{
704 		.name = "buck2",
705 		.id = LP8725_ID_BUCK2,
706 		.ops = &lp8725_buck_ops,
707 		.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
708 		.volt_table = lp8725_buck_vtbl,
709 		.type = REGULATOR_VOLTAGE,
710 		.owner = THIS_MODULE,
711 		.enable_reg = LP872X_GENERAL_CFG,
712 		.enable_mask = LP8725_BUCK2_EN_M,
713 	},
714 };
715 
716 static int lp872x_init_dvs(struct lp872x *lp)
717 {
718 	int ret, gpio;
719 	struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
720 	enum lp872x_dvs_state pinstate;
721 	u8 mask[] = { LP8720_EXT_DVS_M, LP8725_DVS1_M | LP8725_DVS2_M };
722 	u8 default_dvs_mode[] = { LP8720_DEFAULT_DVS, LP8725_DEFAULT_DVS };
723 
724 	if (!dvs)
725 		goto set_default_dvs_mode;
726 
727 	gpio = dvs->gpio;
728 	if (!gpio_is_valid(gpio)) {
729 		dev_warn(lp->dev, "invalid gpio: %d\n", gpio);
730 		goto set_default_dvs_mode;
731 	}
732 
733 	pinstate = dvs->init_state;
734 	ret = devm_gpio_request_one(lp->dev, gpio, pinstate, "LP872X DVS");
735 	if (ret) {
736 		dev_err(lp->dev, "gpio request err: %d\n", ret);
737 		return ret;
738 	}
739 
740 	lp->dvs_pin = pinstate;
741 	lp->dvs_gpio = gpio;
742 
743 	return 0;
744 
745 set_default_dvs_mode:
746 	return lp872x_update_bits(lp, LP872X_GENERAL_CFG, mask[lp->chipid],
747 				default_dvs_mode[lp->chipid]);
748 }
749 
750 static int lp872x_config(struct lp872x *lp)
751 {
752 	struct lp872x_platform_data *pdata = lp->pdata;
753 	int ret;
754 
755 	if (!pdata || !pdata->update_config)
756 		goto init_dvs;
757 
758 	ret = lp872x_write_byte(lp, LP872X_GENERAL_CFG, pdata->general_config);
759 	if (ret)
760 		return ret;
761 
762 init_dvs:
763 	return lp872x_init_dvs(lp);
764 }
765 
766 static struct regulator_init_data
767 *lp872x_find_regulator_init_data(int id, struct lp872x *lp)
768 {
769 	struct lp872x_platform_data *pdata = lp->pdata;
770 	int i;
771 
772 	if (!pdata)
773 		return NULL;
774 
775 	for (i = 0; i < lp->num_regulators; i++) {
776 		if (pdata->regulator_data[i].id == id)
777 			return pdata->regulator_data[i].init_data;
778 	}
779 
780 	return NULL;
781 }
782 
783 static int lp872x_regulator_register(struct lp872x *lp)
784 {
785 	struct regulator_desc *desc;
786 	struct regulator_config cfg = { };
787 	struct regulator_dev *rdev;
788 	int i;
789 
790 	for (i = 0; i < lp->num_regulators; i++) {
791 		desc = (lp->chipid == LP8720) ? &lp8720_regulator_desc[i] :
792 						&lp8725_regulator_desc[i];
793 
794 		cfg.dev = lp->dev;
795 		cfg.init_data = lp872x_find_regulator_init_data(desc->id, lp);
796 		cfg.driver_data = lp;
797 		cfg.regmap = lp->regmap;
798 
799 		rdev = devm_regulator_register(lp->dev, desc, &cfg);
800 		if (IS_ERR(rdev)) {
801 			dev_err(lp->dev, "regulator register err");
802 			return PTR_ERR(rdev);
803 		}
804 
805 		*(lp->regulators + i) = rdev;
806 	}
807 
808 	return 0;
809 }
810 
811 static const struct regmap_config lp872x_regmap_config = {
812 	.reg_bits = 8,
813 	.val_bits = 8,
814 	.max_register = MAX_REGISTERS,
815 };
816 
817 #ifdef CONFIG_OF
818 
819 #define LP872X_VALID_OPMODE	(REGULATOR_MODE_FAST | REGULATOR_MODE_NORMAL)
820 
821 static struct of_regulator_match lp8720_matches[] = {
822 	{ .name = "ldo1", .driver_data = (void *)LP8720_ID_LDO1, },
823 	{ .name = "ldo2", .driver_data = (void *)LP8720_ID_LDO2, },
824 	{ .name = "ldo3", .driver_data = (void *)LP8720_ID_LDO3, },
825 	{ .name = "ldo4", .driver_data = (void *)LP8720_ID_LDO4, },
826 	{ .name = "ldo5", .driver_data = (void *)LP8720_ID_LDO5, },
827 	{ .name = "buck", .driver_data = (void *)LP8720_ID_BUCK, },
828 };
829 
830 static struct of_regulator_match lp8725_matches[] = {
831 	{ .name = "ldo1", .driver_data = (void *)LP8725_ID_LDO1, },
832 	{ .name = "ldo2", .driver_data = (void *)LP8725_ID_LDO2, },
833 	{ .name = "ldo3", .driver_data = (void *)LP8725_ID_LDO3, },
834 	{ .name = "ldo4", .driver_data = (void *)LP8725_ID_LDO4, },
835 	{ .name = "ldo5", .driver_data = (void *)LP8725_ID_LDO5, },
836 	{ .name = "lilo1", .driver_data = (void *)LP8725_ID_LILO1, },
837 	{ .name = "lilo2", .driver_data = (void *)LP8725_ID_LILO2, },
838 	{ .name = "buck1", .driver_data = (void *)LP8725_ID_BUCK1, },
839 	{ .name = "buck2", .driver_data = (void *)LP8725_ID_BUCK2, },
840 };
841 
842 static struct lp872x_platform_data
843 *lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
844 {
845 	struct device_node *np = dev->of_node;
846 	struct lp872x_platform_data *pdata;
847 	struct of_regulator_match *match;
848 	int num_matches;
849 	int count;
850 	int i;
851 	u8 dvs_state;
852 
853 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
854 	if (!pdata)
855 		goto out;
856 
857 	of_property_read_u8(np, "ti,general-config", &pdata->general_config);
858 	if (of_find_property(np, "ti,update-config", NULL))
859 		pdata->update_config = true;
860 
861 	pdata->dvs = devm_kzalloc(dev, sizeof(struct lp872x_dvs), GFP_KERNEL);
862 	if (!pdata->dvs)
863 		goto out;
864 
865 	pdata->dvs->gpio = of_get_named_gpio(np, "ti,dvs-gpio", 0);
866 	of_property_read_u8(np, "ti,dvs-vsel", (u8 *)&pdata->dvs->vsel);
867 	of_property_read_u8(np, "ti,dvs-state", &dvs_state);
868 	pdata->dvs->init_state = dvs_state ? DVS_HIGH : DVS_LOW;
869 
870 	if (of_get_child_count(np) == 0)
871 		goto out;
872 
873 	switch (which) {
874 	case LP8720:
875 		match = lp8720_matches;
876 		num_matches = ARRAY_SIZE(lp8720_matches);
877 		break;
878 	case LP8725:
879 		match = lp8725_matches;
880 		num_matches = ARRAY_SIZE(lp8725_matches);
881 		break;
882 	default:
883 		goto out;
884 	}
885 
886 	count = of_regulator_match(dev, np, match, num_matches);
887 	if (count <= 0)
888 		goto out;
889 
890 	for (i = 0; i < num_matches; i++) {
891 		pdata->regulator_data[i].id =
892 				(enum lp872x_regulator_id)match[i].driver_data;
893 		pdata->regulator_data[i].init_data = match[i].init_data;
894 	}
895 out:
896 	return pdata;
897 }
898 #else
899 static struct lp872x_platform_data
900 *lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
901 {
902 	return NULL;
903 }
904 #endif
905 
906 static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
907 {
908 	struct lp872x *lp;
909 	int ret, size, num_regulators;
910 	const int lp872x_num_regulators[] = {
911 		[LP8720] = LP8720_NUM_REGULATORS,
912 		[LP8725] = LP8725_NUM_REGULATORS,
913 	};
914 
915 	if (cl->dev.of_node)
916 		cl->dev.platform_data = lp872x_populate_pdata_from_dt(&cl->dev,
917 					      (enum lp872x_id)id->driver_data);
918 
919 	lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
920 	if (!lp)
921 		goto err_mem;
922 
923 	num_regulators = lp872x_num_regulators[id->driver_data];
924 	size = sizeof(struct regulator_dev *) * num_regulators;
925 
926 	lp->regulators = devm_kzalloc(&cl->dev, size, GFP_KERNEL);
927 	if (!lp->regulators)
928 		goto err_mem;
929 
930 	lp->regmap = devm_regmap_init_i2c(cl, &lp872x_regmap_config);
931 	if (IS_ERR(lp->regmap)) {
932 		ret = PTR_ERR(lp->regmap);
933 		dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
934 		goto err_dev;
935 	}
936 
937 	lp->dev = &cl->dev;
938 	lp->pdata = dev_get_platdata(&cl->dev);
939 	lp->chipid = id->driver_data;
940 	lp->num_regulators = num_regulators;
941 	i2c_set_clientdata(cl, lp);
942 
943 	ret = lp872x_config(lp);
944 	if (ret)
945 		goto err_dev;
946 
947 	return lp872x_regulator_register(lp);
948 
949 err_mem:
950 	return -ENOMEM;
951 err_dev:
952 	return ret;
953 }
954 
955 static const struct of_device_id lp872x_dt_ids[] = {
956 	{ .compatible = "ti,lp8720", },
957 	{ .compatible = "ti,lp8725", },
958 	{ }
959 };
960 MODULE_DEVICE_TABLE(of, lp872x_dt_ids);
961 
962 static const struct i2c_device_id lp872x_ids[] = {
963 	{"lp8720", LP8720},
964 	{"lp8725", LP8725},
965 	{ }
966 };
967 MODULE_DEVICE_TABLE(i2c, lp872x_ids);
968 
969 static struct i2c_driver lp872x_driver = {
970 	.driver = {
971 		.name = "lp872x",
972 		.owner = THIS_MODULE,
973 		.of_match_table = of_match_ptr(lp872x_dt_ids),
974 	},
975 	.probe = lp872x_probe,
976 	.id_table = lp872x_ids,
977 };
978 
979 module_i2c_driver(lp872x_driver);
980 
981 MODULE_DESCRIPTION("TI/National Semiconductor LP872x PMU Regulator Driver");
982 MODULE_AUTHOR("Milo Kim");
983 MODULE_LICENSE("GPL");
984