1 /*
2  * max77802.c - Regulator driver for the Maxim 77802
3  *
4  * Copyright (C) 2013-2014 Google, Inc
5  * Simon Glass <sjg@chromium.org>
6  *
7  * Copyright (C) 2012 Samsung Electronics
8  * Chiwoong Byun <woong.byun@samsung.com>
9  * Jonghwa Lee <jonghwa3.lee@samsung.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * This driver is based on max8997.c
22  */
23 
24 #include <linux/kernel.h>
25 #include <linux/bug.h>
26 #include <linux/err.h>
27 #include <linux/gpio.h>
28 #include <linux/slab.h>
29 #include <linux/gpio/consumer.h>
30 #include <linux/module.h>
31 #include <linux/platform_device.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/regulator/of_regulator.h>
35 #include <linux/mfd/max77686.h>
36 #include <linux/mfd/max77686-private.h>
37 #include <dt-bindings/regulator/maxim,max77802.h>
38 
39 /* Default ramp delay in case it is not manually set */
40 #define MAX77802_RAMP_DELAY		100000		/* uV/us */
41 
42 #define MAX77802_OPMODE_SHIFT_LDO	6
43 #define MAX77802_OPMODE_BUCK234_SHIFT	4
44 #define MAX77802_OPMODE_MASK		0x3
45 
46 #define MAX77802_VSEL_MASK		0x3F
47 #define MAX77802_DVS_VSEL_MASK		0xFF
48 
49 #define MAX77802_RAMP_RATE_MASK_2BIT	0xC0
50 #define MAX77802_RAMP_RATE_SHIFT_2BIT	6
51 #define MAX77802_RAMP_RATE_MASK_4BIT	0xF0
52 #define MAX77802_RAMP_RATE_SHIFT_4BIT	4
53 
54 #define MAX77802_STATUS_OFF		0x0
55 #define MAX77802_OFF_PWRREQ		0x1
56 #define MAX77802_LP_PWRREQ		0x2
57 
58 /* MAX77802 has two register formats: 2-bit and 4-bit */
59 static const unsigned int ramp_table_77802_2bit[] = {
60 	12500,
61 	25000,
62 	50000,
63 	100000,
64 };
65 
66 static unsigned int ramp_table_77802_4bit[] = {
67 	1000,	2000,	3030,	4000,
68 	5000,	5880,	7140,	8330,
69 	9090,	10000,	11110,	12500,
70 	16670,	25000,	50000,	100000,
71 };
72 
73 struct max77802_regulator_prv {
74 	/* Array indexed by regulator id */
75 	unsigned int opmode[MAX77802_REG_MAX];
76 };
77 
78 static inline unsigned int max77802_map_mode(unsigned int mode)
79 {
80 	return mode == MAX77802_OPMODE_NORMAL ?
81 		REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
82 }
83 
84 static int max77802_get_opmode_shift(int id)
85 {
86 	if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
87 				     id <= MAX77802_BUCK10))
88 		return 0;
89 
90 	if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
91 		return MAX77802_OPMODE_BUCK234_SHIFT;
92 
93 	if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
94 		return MAX77802_OPMODE_SHIFT_LDO;
95 
96 	return -EINVAL;
97 }
98 
99 /**
100  * max77802_set_suspend_disable - Disable the regulator during system suspend
101  * @rdev: regulator to mark as disabled
102  *
103  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
104  * Configure the regulator so the PMIC will turn it OFF during system suspend.
105  */
106 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
107 {
108 	unsigned int val = MAX77802_OFF_PWRREQ;
109 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
110 	int id = rdev_get_id(rdev);
111 	int shift = max77802_get_opmode_shift(id);
112 
113 	max77802->opmode[id] = val;
114 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
115 				  rdev->desc->enable_mask, val << shift);
116 }
117 
118 /*
119  * Some LDOs support Low Power Mode while the system is running.
120  *
121  * LDOs 1, 3, 20, 21.
122  */
123 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
124 {
125 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
126 	int id = rdev_get_id(rdev);
127 	unsigned int val;
128 	int shift = max77802_get_opmode_shift(id);
129 
130 	switch (mode) {
131 	case REGULATOR_MODE_STANDBY:
132 		val = MAX77802_OPMODE_LP;	/* ON in Low Power Mode */
133 		break;
134 	case REGULATOR_MODE_NORMAL:
135 		val = MAX77802_OPMODE_NORMAL;	/* ON in Normal Mode */
136 		break;
137 	default:
138 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
139 			 rdev->desc->name, mode);
140 		return -EINVAL;
141 	}
142 
143 	max77802->opmode[id] = val;
144 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
145 				  rdev->desc->enable_mask, val << shift);
146 }
147 
148 static unsigned max77802_get_mode(struct regulator_dev *rdev)
149 {
150 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
151 	int id = rdev_get_id(rdev);
152 
153 	return max77802_map_mode(max77802->opmode[id]);
154 }
155 
156 /**
157  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
158  * @rdev: regulator to change mode
159  * @mode: operating mode to be set
160  *
161  * Will set the operating mode for the regulators during system suspend.
162  * This function is valid for the three different enable control logics:
163  *
164  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
165  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
166  * Enable Control Logic3 by PWRREQ (LDO 3)
167  *
168  * If setting the regulator mode fails, the function only warns but does
169  * not return an error code to avoid the regulator core to stop setting
170  * the operating mode for the remaining regulators.
171  */
172 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
173 				     unsigned int mode)
174 {
175 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
176 	int id = rdev_get_id(rdev);
177 	unsigned int val;
178 	int shift = max77802_get_opmode_shift(id);
179 
180 	/*
181 	 * If the regulator has been disabled for suspend
182 	 * then is invalid to try setting a suspend mode.
183 	 */
184 	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
185 		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
186 			 rdev->desc->name, mode);
187 		return 0;
188 	}
189 
190 	switch (mode) {
191 	case REGULATOR_MODE_STANDBY:
192 		/*
193 		 * If the regulator opmode is normal then enable
194 		 * ON in Low Power Mode by PWRREQ. If the mode is
195 		 * already Low Power then no action is required.
196 		 */
197 		if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
198 			val = MAX77802_LP_PWRREQ;
199 		else
200 			return 0;
201 		break;
202 	case REGULATOR_MODE_NORMAL:
203 		/*
204 		 * If the regulator operating mode is Low Power then
205 		 * normal is not a valid opmode in suspend. If the
206 		 * mode is already normal then no action is required.
207 		 */
208 		if (max77802->opmode[id] == MAX77802_OPMODE_LP)
209 			dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
210 				 rdev->desc->name, mode);
211 		return 0;
212 	default:
213 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
214 			 rdev->desc->name, mode);
215 		return -EINVAL;
216 	}
217 
218 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
219 				  rdev->desc->enable_mask, val << shift);
220 }
221 
222 static int max77802_enable(struct regulator_dev *rdev)
223 {
224 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
225 	int id = rdev_get_id(rdev);
226 	int shift = max77802_get_opmode_shift(id);
227 
228 	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
229 		max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
230 
231 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
232 				  rdev->desc->enable_mask,
233 				  max77802->opmode[id] << shift);
234 }
235 
236 static int max77802_find_ramp_value(struct regulator_dev *rdev,
237 				    const unsigned int limits[], int size,
238 				    unsigned int ramp_delay)
239 {
240 	int i;
241 
242 	for (i = 0; i < size; i++) {
243 		if (ramp_delay <= limits[i])
244 			return i;
245 	}
246 
247 	/* Use maximum value for no ramp control */
248 	dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
249 		 rdev->desc->name, ramp_delay);
250 	return size - 1;
251 }
252 
253 /* Used for BUCKs 2-4 */
254 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
255 					int ramp_delay)
256 {
257 	int id = rdev_get_id(rdev);
258 	unsigned int ramp_value;
259 
260 	if (id > MAX77802_BUCK4) {
261 			dev_warn(&rdev->dev,
262 				 "%s: regulator: ramp delay not supported\n",
263 				 rdev->desc->name);
264 		return -EINVAL;
265 	}
266 	ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
267 				ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
268 
269 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
270 				  MAX77802_RAMP_RATE_MASK_2BIT,
271 				  ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
272 }
273 
274 /* For BUCK1, 6 */
275 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
276 					    int ramp_delay)
277 {
278 	unsigned int ramp_value;
279 
280 	ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
281 				ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
282 
283 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
284 				  MAX77802_RAMP_RATE_MASK_4BIT,
285 				  ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
286 }
287 
288 /*
289  * LDOs 2, 4-19, 22-35
290  */
291 static const struct regulator_ops max77802_ldo_ops_logic1 = {
292 	.list_voltage		= regulator_list_voltage_linear,
293 	.map_voltage		= regulator_map_voltage_linear,
294 	.is_enabled		= regulator_is_enabled_regmap,
295 	.enable			= max77802_enable,
296 	.disable		= regulator_disable_regmap,
297 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
298 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
299 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
300 	.set_suspend_disable	= max77802_set_suspend_disable,
301 	.set_suspend_mode	= max77802_set_suspend_mode,
302 };
303 
304 /*
305  * LDOs 1, 20, 21, 3
306  */
307 static const struct regulator_ops max77802_ldo_ops_logic2 = {
308 	.list_voltage		= regulator_list_voltage_linear,
309 	.map_voltage		= regulator_map_voltage_linear,
310 	.is_enabled		= regulator_is_enabled_regmap,
311 	.enable			= max77802_enable,
312 	.disable		= regulator_disable_regmap,
313 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
314 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
315 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
316 	.set_mode		= max77802_set_mode,
317 	.get_mode		= max77802_get_mode,
318 	.set_suspend_mode	= max77802_set_suspend_mode,
319 };
320 
321 /* BUCKS 1, 6 */
322 static const struct regulator_ops max77802_buck_16_dvs_ops = {
323 	.list_voltage		= regulator_list_voltage_linear,
324 	.map_voltage		= regulator_map_voltage_linear,
325 	.is_enabled		= regulator_is_enabled_regmap,
326 	.enable			= max77802_enable,
327 	.disable		= regulator_disable_regmap,
328 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
329 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
330 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
331 	.set_ramp_delay		= max77802_set_ramp_delay_4bit,
332 	.set_suspend_disable	= max77802_set_suspend_disable,
333 };
334 
335 /* BUCKs 2-4 */
336 static const struct regulator_ops max77802_buck_234_ops = {
337 	.list_voltage		= regulator_list_voltage_linear,
338 	.map_voltage		= regulator_map_voltage_linear,
339 	.is_enabled		= regulator_is_enabled_regmap,
340 	.enable			= max77802_enable,
341 	.disable		= regulator_disable_regmap,
342 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
343 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
344 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
345 	.set_ramp_delay		= max77802_set_ramp_delay_2bit,
346 	.set_suspend_disable	= max77802_set_suspend_disable,
347 	.set_suspend_mode	= max77802_set_suspend_mode,
348 };
349 
350 /* BUCKs 5, 7-10 */
351 static const struct regulator_ops max77802_buck_dvs_ops = {
352 	.list_voltage		= regulator_list_voltage_linear,
353 	.map_voltage		= regulator_map_voltage_linear,
354 	.is_enabled		= regulator_is_enabled_regmap,
355 	.enable			= max77802_enable,
356 	.disable		= regulator_disable_regmap,
357 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
358 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
359 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
360 	.set_ramp_delay		= max77802_set_ramp_delay_2bit,
361 	.set_suspend_disable	= max77802_set_suspend_disable,
362 };
363 
364 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
365 #define regulator_77802_desc_p_ldo(num, supply, log)	{		\
366 	.name		= "LDO"#num,					\
367 	.of_match	= of_match_ptr("LDO"#num),			\
368 	.regulators_node	= of_match_ptr("regulators"),		\
369 	.id		= MAX77802_LDO##num,				\
370 	.supply_name	= "inl"#supply,					\
371 	.ops		= &max77802_ldo_ops_logic##log,			\
372 	.type		= REGULATOR_VOLTAGE,				\
373 	.owner		= THIS_MODULE,					\
374 	.min_uV		= 800000,					\
375 	.uV_step	= 50000,					\
376 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
377 	.n_voltages	= 1 << 6,					\
378 	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
379 	.vsel_mask	= MAX77802_VSEL_MASK,				\
380 	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
381 	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
382 	.of_map_mode	= max77802_map_mode,				\
383 }
384 
385 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
386 #define regulator_77802_desc_n_ldo(num, supply, log)   {		\
387 	.name		= "LDO"#num,					\
388 	.of_match	= of_match_ptr("LDO"#num),			\
389 	.regulators_node	= of_match_ptr("regulators"),		\
390 	.id		= MAX77802_LDO##num,				\
391 	.supply_name	= "inl"#supply,					\
392 	.ops		= &max77802_ldo_ops_logic##log,			\
393 	.type		= REGULATOR_VOLTAGE,				\
394 	.owner		= THIS_MODULE,					\
395 	.min_uV		= 800000,					\
396 	.uV_step	= 25000,					\
397 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
398 	.n_voltages	= 1 << 6,					\
399 	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
400 	.vsel_mask	= MAX77802_VSEL_MASK,				\
401 	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
402 	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
403 	.of_map_mode	= max77802_map_mode,				\
404 }
405 
406 /* BUCKs 1, 6 */
407 #define regulator_77802_desc_16_buck(num)	{		\
408 	.name		= "BUCK"#num,					\
409 	.of_match	= of_match_ptr("BUCK"#num),			\
410 	.regulators_node	= of_match_ptr("regulators"),		\
411 	.id		= MAX77802_BUCK##num,				\
412 	.supply_name	= "inb"#num,					\
413 	.ops		= &max77802_buck_16_dvs_ops,			\
414 	.type		= REGULATOR_VOLTAGE,				\
415 	.owner		= THIS_MODULE,					\
416 	.min_uV		= 612500,					\
417 	.uV_step	= 6250,						\
418 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
419 	.n_voltages	= 1 << 8,					\
420 	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
421 	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
422 	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL,		\
423 	.enable_mask	= MAX77802_OPMODE_MASK,				\
424 	.of_map_mode	= max77802_map_mode,				\
425 }
426 
427 /* BUCKS 2-4 */
428 #define regulator_77802_desc_234_buck(num)	{		\
429 	.name		= "BUCK"#num,					\
430 	.of_match	= of_match_ptr("BUCK"#num),			\
431 	.regulators_node	= of_match_ptr("regulators"),		\
432 	.id		= MAX77802_BUCK##num,				\
433 	.supply_name	= "inb"#num,					\
434 	.ops		= &max77802_buck_234_ops,			\
435 	.type		= REGULATOR_VOLTAGE,				\
436 	.owner		= THIS_MODULE,					\
437 	.min_uV		= 600000,					\
438 	.uV_step	= 6250,						\
439 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
440 	.n_voltages	= 0x91,						\
441 	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
442 	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
443 	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL1,		\
444 	.enable_mask	= MAX77802_OPMODE_MASK <<			\
445 				MAX77802_OPMODE_BUCK234_SHIFT,		\
446 	.of_map_mode	= max77802_map_mode,				\
447 }
448 
449 /* BUCK 5 */
450 #define regulator_77802_desc_buck5(num)		{		\
451 	.name		= "BUCK"#num,					\
452 	.of_match	= of_match_ptr("BUCK"#num),			\
453 	.regulators_node	= of_match_ptr("regulators"),		\
454 	.id		= MAX77802_BUCK##num,				\
455 	.supply_name	= "inb"#num,					\
456 	.ops		= &max77802_buck_dvs_ops,			\
457 	.type		= REGULATOR_VOLTAGE,				\
458 	.owner		= THIS_MODULE,					\
459 	.min_uV		= 750000,					\
460 	.uV_step	= 50000,					\
461 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
462 	.n_voltages	= 1 << 6,					\
463 	.vsel_reg	= MAX77802_REG_BUCK5OUT,			\
464 	.vsel_mask	= MAX77802_VSEL_MASK,				\
465 	.enable_reg	= MAX77802_REG_BUCK5CTRL,			\
466 	.enable_mask	= MAX77802_OPMODE_MASK,				\
467 	.of_map_mode	= max77802_map_mode,				\
468 }
469 
470 /* BUCKs 7-10 */
471 #define regulator_77802_desc_buck7_10(num)	{		\
472 	.name		= "BUCK"#num,					\
473 	.of_match	= of_match_ptr("BUCK"#num),			\
474 	.regulators_node	= of_match_ptr("regulators"),		\
475 	.id		= MAX77802_BUCK##num,				\
476 	.supply_name	= "inb"#num,					\
477 	.ops		= &max77802_buck_dvs_ops,			\
478 	.type		= REGULATOR_VOLTAGE,				\
479 	.owner		= THIS_MODULE,					\
480 	.min_uV		= 750000,					\
481 	.uV_step	= 50000,					\
482 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
483 	.n_voltages	= 1 << 6,					\
484 	.vsel_reg	= MAX77802_REG_BUCK7OUT + (num - 7) * 3,	\
485 	.vsel_mask	= MAX77802_VSEL_MASK,				\
486 	.enable_reg	= MAX77802_REG_BUCK7CTRL + (num - 7) * 3,	\
487 	.enable_mask	= MAX77802_OPMODE_MASK,				\
488 	.of_map_mode	= max77802_map_mode,				\
489 }
490 
491 static const struct regulator_desc regulators[] = {
492 	regulator_77802_desc_16_buck(1),
493 	regulator_77802_desc_234_buck(2),
494 	regulator_77802_desc_234_buck(3),
495 	regulator_77802_desc_234_buck(4),
496 	regulator_77802_desc_buck5(5),
497 	regulator_77802_desc_16_buck(6),
498 	regulator_77802_desc_buck7_10(7),
499 	regulator_77802_desc_buck7_10(8),
500 	regulator_77802_desc_buck7_10(9),
501 	regulator_77802_desc_buck7_10(10),
502 	regulator_77802_desc_n_ldo(1, 10, 2),
503 	regulator_77802_desc_n_ldo(2, 10, 1),
504 	regulator_77802_desc_p_ldo(3, 3, 2),
505 	regulator_77802_desc_p_ldo(4, 6, 1),
506 	regulator_77802_desc_p_ldo(5, 3, 1),
507 	regulator_77802_desc_p_ldo(6, 3, 1),
508 	regulator_77802_desc_p_ldo(7, 3, 1),
509 	regulator_77802_desc_n_ldo(8, 1, 1),
510 	regulator_77802_desc_p_ldo(9, 5, 1),
511 	regulator_77802_desc_p_ldo(10, 4, 1),
512 	regulator_77802_desc_p_ldo(11, 4, 1),
513 	regulator_77802_desc_p_ldo(12, 9, 1),
514 	regulator_77802_desc_p_ldo(13, 4, 1),
515 	regulator_77802_desc_p_ldo(14, 4, 1),
516 	regulator_77802_desc_n_ldo(15, 1, 1),
517 	regulator_77802_desc_n_ldo(17, 2, 1),
518 	regulator_77802_desc_p_ldo(18, 7, 1),
519 	regulator_77802_desc_p_ldo(19, 5, 1),
520 	regulator_77802_desc_p_ldo(20, 7, 2),
521 	regulator_77802_desc_p_ldo(21, 6, 2),
522 	regulator_77802_desc_p_ldo(23, 9, 1),
523 	regulator_77802_desc_p_ldo(24, 6, 1),
524 	regulator_77802_desc_p_ldo(25, 9, 1),
525 	regulator_77802_desc_p_ldo(26, 9, 1),
526 	regulator_77802_desc_n_ldo(27, 2, 1),
527 	regulator_77802_desc_p_ldo(28, 7, 1),
528 	regulator_77802_desc_p_ldo(29, 7, 1),
529 	regulator_77802_desc_n_ldo(30, 2, 1),
530 	regulator_77802_desc_p_ldo(32, 9, 1),
531 	regulator_77802_desc_p_ldo(33, 6, 1),
532 	regulator_77802_desc_p_ldo(34, 9, 1),
533 	regulator_77802_desc_n_ldo(35, 2, 1),
534 };
535 
536 static int max77802_pmic_probe(struct platform_device *pdev)
537 {
538 	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
539 	struct max77802_regulator_prv *max77802;
540 	int i, val;
541 	struct regulator_config config = { };
542 
543 	max77802 = devm_kzalloc(&pdev->dev,
544 				sizeof(struct max77802_regulator_prv),
545 				GFP_KERNEL);
546 	if (!max77802)
547 		return -ENOMEM;
548 
549 	config.dev = iodev->dev;
550 	config.regmap = iodev->regmap;
551 	config.driver_data = max77802;
552 	platform_set_drvdata(pdev, max77802);
553 
554 	for (i = 0; i < MAX77802_REG_MAX; i++) {
555 		struct regulator_dev *rdev;
556 		int id = regulators[i].id;
557 		int shift = max77802_get_opmode_shift(id);
558 		int ret;
559 
560 		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
561 		if (ret < 0) {
562 			dev_warn(&pdev->dev,
563 				"cannot read current mode for %d\n", i);
564 			val = MAX77802_OPMODE_NORMAL;
565 		} else {
566 			val = val >> shift & MAX77802_OPMODE_MASK;
567 		}
568 
569 		/*
570 		 * If the regulator is disabled and the system warm rebooted,
571 		 * the hardware reports OFF as the regulator operating mode.
572 		 * Default to operating mode NORMAL in that case.
573 		 */
574 		if (val == MAX77802_STATUS_OFF)
575 			max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
576 		else
577 			max77802->opmode[id] = val;
578 
579 		rdev = devm_regulator_register(&pdev->dev,
580 					       &regulators[i], &config);
581 		if (IS_ERR(rdev)) {
582 			ret = PTR_ERR(rdev);
583 			dev_err(&pdev->dev,
584 				"regulator init failed for %d: %d\n", i, ret);
585 			return ret;
586 		}
587 	}
588 
589 	return 0;
590 }
591 
592 static const struct platform_device_id max77802_pmic_id[] = {
593 	{"max77802-pmic", 0},
594 	{ },
595 };
596 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
597 
598 static struct platform_driver max77802_pmic_driver = {
599 	.driver = {
600 		.name = "max77802-pmic",
601 	},
602 	.probe = max77802_pmic_probe,
603 	.id_table = max77802_pmic_id,
604 };
605 
606 module_platform_driver(max77802_pmic_driver);
607 
608 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
609 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
610 MODULE_LICENSE("GPL");
611