1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max77686.c - Regulator driver for the Maxim 77686
4 //
5 // Copyright (C) 2012 Samsung Electronics
6 // Chiwoong Byun <woong.byun@samsung.com>
7 // Jonghwa Lee <jonghwa3.lee@samsung.com>
8 //
9 // This driver is based on max8997.c
10 
11 #include <linux/kernel.h>
12 #include <linux/bug.h>
13 #include <linux/err.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/regulator/of_regulator.h>
20 #include <linux/mfd/max77686.h>
21 #include <linux/mfd/max77686-private.h>
22 
23 #define MAX77686_LDO_MINUV	800000
24 #define MAX77686_LDO_UVSTEP	50000
25 #define MAX77686_LDO_LOW_MINUV	800000
26 #define MAX77686_LDO_LOW_UVSTEP	25000
27 #define MAX77686_BUCK_MINUV	750000
28 #define MAX77686_BUCK_UVSTEP	50000
29 #define MAX77686_BUCK_ENABLE_TIME	40		/* us */
30 #define MAX77686_DVS_ENABLE_TIME	22		/* us */
31 #define MAX77686_RAMP_DELAY	100000			/* uV/us */
32 #define MAX77686_DVS_RAMP_DELAY	27500			/* uV/us */
33 #define MAX77686_DVS_MINUV	600000
34 #define MAX77686_DVS_UVSTEP	12500
35 
36 /*
37  * Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
38  * It is the same as 'off' for other regulators.
39  */
40 #define MAX77686_GPIO_CONTROL		0x0
41 /*
42  * Values used for configuring LDOs and bucks.
43  * Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
44  */
45 #define MAX77686_LDO_LOWPOWER		0x1
46 /*
47  * On/off controlled by PWRREQ:
48  *  - LDO2, 6-8, 10-12, 14-16
49  *  - buck[1234]
50  */
51 #define MAX77686_OFF_PWRREQ		0x1
52 /* Low power mode controlled by PWRREQ: All LDOs */
53 #define MAX77686_LDO_LOWPOWER_PWRREQ	0x2
54 /* Forcing low power mode: buck[234] */
55 #define MAX77686_BUCK_LOWPOWER		0x2
56 #define MAX77686_NORMAL			0x3
57 
58 #define MAX77686_OPMODE_SHIFT	6
59 #define MAX77686_OPMODE_BUCK234_SHIFT	4
60 #define MAX77686_OPMODE_MASK	0x3
61 
62 #define MAX77686_VSEL_MASK	0x3F
63 #define MAX77686_DVS_VSEL_MASK	0xFF
64 
65 #define MAX77686_RAMP_RATE_MASK	0xC0
66 
67 #define MAX77686_REGULATORS	MAX77686_REG_MAX
68 #define MAX77686_LDOS		26
69 
70 enum max77686_ramp_rate {
71 	RAMP_RATE_13P75MV,
72 	RAMP_RATE_27P5MV,
73 	RAMP_RATE_55MV,
74 	RAMP_RATE_NO_CTRL,	/* 100mV/us */
75 };
76 
77 struct max77686_data {
78 	struct device *dev;
79 	DECLARE_BITMAP(gpio_enabled, MAX77686_REGULATORS);
80 
81 	/* Array indexed by regulator id */
82 	unsigned int opmode[MAX77686_REGULATORS];
83 };
84 
max77686_get_opmode_shift(int id)85 static unsigned int max77686_get_opmode_shift(int id)
86 {
87 	switch (id) {
88 	case MAX77686_BUCK1:
89 	case MAX77686_BUCK5 ... MAX77686_BUCK9:
90 		return 0;
91 	case MAX77686_BUCK2 ... MAX77686_BUCK4:
92 		return MAX77686_OPMODE_BUCK234_SHIFT;
93 	default:
94 		/* all LDOs */
95 		return MAX77686_OPMODE_SHIFT;
96 	}
97 }
98 
99 /*
100  * When regulator is configured for GPIO control then it
101  * replaces "normal" mode. Any change from low power mode to normal
102  * should actually change to GPIO control.
103  * Map normal mode to proper value for such regulators.
104  */
max77686_map_normal_mode(struct max77686_data * max77686,int id)105 static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
106 					     int id)
107 {
108 	switch (id) {
109 	case MAX77686_BUCK8:
110 	case MAX77686_BUCK9:
111 	case MAX77686_LDO20 ... MAX77686_LDO22:
112 		if (test_bit(id, max77686->gpio_enabled))
113 			return MAX77686_GPIO_CONTROL;
114 	}
115 
116 	return MAX77686_NORMAL;
117 }
118 
119 /* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
max77686_set_suspend_disable(struct regulator_dev * rdev)120 static int max77686_set_suspend_disable(struct regulator_dev *rdev)
121 {
122 	unsigned int val, shift;
123 	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
124 	int ret, id = rdev_get_id(rdev);
125 
126 	shift = max77686_get_opmode_shift(id);
127 	val = MAX77686_OFF_PWRREQ;
128 
129 	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
130 				 rdev->desc->enable_mask, val << shift);
131 	if (ret)
132 		return ret;
133 
134 	max77686->opmode[id] = val;
135 	return 0;
136 }
137 
138 /* Some LDOs supports [LPM/Normal]ON mode during suspend state */
max77686_set_suspend_mode(struct regulator_dev * rdev,unsigned int mode)139 static int max77686_set_suspend_mode(struct regulator_dev *rdev,
140 				     unsigned int mode)
141 {
142 	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
143 	unsigned int val;
144 	int ret, id = rdev_get_id(rdev);
145 
146 	/* BUCK[5-9] doesn't support this feature */
147 	if (id >= MAX77686_BUCK5)
148 		return 0;
149 
150 	switch (mode) {
151 	case REGULATOR_MODE_IDLE:			/* ON in LP Mode */
152 		val = MAX77686_LDO_LOWPOWER_PWRREQ;
153 		break;
154 	case REGULATOR_MODE_NORMAL:			/* ON in Normal Mode */
155 		val = max77686_map_normal_mode(max77686, id);
156 		break;
157 	default:
158 		pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
159 			rdev->desc->name, mode);
160 		return -EINVAL;
161 	}
162 
163 	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
164 				  rdev->desc->enable_mask,
165 				  val << MAX77686_OPMODE_SHIFT);
166 	if (ret)
167 		return ret;
168 
169 	max77686->opmode[id] = val;
170 	return 0;
171 }
172 
173 /* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
max77686_ldo_set_suspend_mode(struct regulator_dev * rdev,unsigned int mode)174 static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
175 				     unsigned int mode)
176 {
177 	unsigned int val;
178 	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
179 	int ret, id = rdev_get_id(rdev);
180 
181 	switch (mode) {
182 	case REGULATOR_MODE_STANDBY:			/* switch off */
183 		val = MAX77686_OFF_PWRREQ;
184 		break;
185 	case REGULATOR_MODE_IDLE:			/* ON in LP Mode */
186 		val = MAX77686_LDO_LOWPOWER_PWRREQ;
187 		break;
188 	case REGULATOR_MODE_NORMAL:			/* ON in Normal Mode */
189 		val = max77686_map_normal_mode(max77686, id);
190 		break;
191 	default:
192 		pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
193 			rdev->desc->name, mode);
194 		return -EINVAL;
195 	}
196 
197 	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
198 				 rdev->desc->enable_mask,
199 				 val << MAX77686_OPMODE_SHIFT);
200 	if (ret)
201 		return ret;
202 
203 	max77686->opmode[id] = val;
204 	return 0;
205 }
206 
max77686_enable(struct regulator_dev * rdev)207 static int max77686_enable(struct regulator_dev *rdev)
208 {
209 	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
210 	unsigned int shift;
211 	int id = rdev_get_id(rdev);
212 
213 	shift = max77686_get_opmode_shift(id);
214 
215 	if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
216 		max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
217 
218 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
219 				  rdev->desc->enable_mask,
220 				  max77686->opmode[id] << shift);
221 }
222 
max77686_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)223 static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
224 {
225 	unsigned int ramp_value = RAMP_RATE_NO_CTRL;
226 
227 	switch (ramp_delay) {
228 	case 1 ... 13750:
229 		ramp_value = RAMP_RATE_13P75MV;
230 		break;
231 	case 13751 ... 27500:
232 		ramp_value = RAMP_RATE_27P5MV;
233 		break;
234 	case 27501 ... 55000:
235 		ramp_value = RAMP_RATE_55MV;
236 		break;
237 	case 55001 ... 100000:
238 		break;
239 	default:
240 		pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
241 			rdev->desc->name, ramp_delay);
242 	}
243 
244 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
245 				  MAX77686_RAMP_RATE_MASK, ramp_value << 6);
246 }
247 
max77686_of_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)248 static int max77686_of_parse_cb(struct device_node *np,
249 		const struct regulator_desc *desc,
250 		struct regulator_config *config)
251 {
252 	struct max77686_data *max77686 = config->driver_data;
253 	int ret;
254 
255 	switch (desc->id) {
256 	case MAX77686_BUCK8:
257 	case MAX77686_BUCK9:
258 	case MAX77686_LDO20 ... MAX77686_LDO22:
259 		config->ena_gpiod = fwnode_gpiod_get_index(
260 				of_fwnode_handle(np),
261 				"maxim,ena",
262 				0,
263 				GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE,
264 				"max77686-regulator");
265 		if (IS_ERR(config->ena_gpiod))
266 			config->ena_gpiod = NULL;
267 		break;
268 	default:
269 		return 0;
270 	}
271 
272 	if (config->ena_gpiod) {
273 		set_bit(desc->id, max77686->gpio_enabled);
274 
275 		ret = regmap_update_bits(config->regmap, desc->enable_reg,
276 					 desc->enable_mask,
277 					 MAX77686_GPIO_CONTROL);
278 		if (ret) {
279 			gpiod_put(config->ena_gpiod);
280 			config->ena_gpiod = NULL;
281 		}
282 	}
283 
284 	return 0;
285 }
286 
287 static const struct regulator_ops max77686_ops = {
288 	.list_voltage		= regulator_list_voltage_linear,
289 	.map_voltage		= regulator_map_voltage_linear,
290 	.is_enabled		= regulator_is_enabled_regmap,
291 	.enable			= max77686_enable,
292 	.disable		= regulator_disable_regmap,
293 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
294 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
295 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
296 	.set_suspend_mode	= max77686_set_suspend_mode,
297 };
298 
299 static const struct regulator_ops max77686_ldo_ops = {
300 	.list_voltage		= regulator_list_voltage_linear,
301 	.map_voltage		= regulator_map_voltage_linear,
302 	.is_enabled		= regulator_is_enabled_regmap,
303 	.enable			= max77686_enable,
304 	.disable		= regulator_disable_regmap,
305 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
306 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
307 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
308 	.set_suspend_mode	= max77686_ldo_set_suspend_mode,
309 	.set_suspend_disable	= max77686_set_suspend_disable,
310 };
311 
312 static const struct regulator_ops max77686_buck1_ops = {
313 	.list_voltage		= regulator_list_voltage_linear,
314 	.map_voltage		= regulator_map_voltage_linear,
315 	.is_enabled		= regulator_is_enabled_regmap,
316 	.enable			= max77686_enable,
317 	.disable		= regulator_disable_regmap,
318 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
319 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
320 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
321 	.set_suspend_disable	= max77686_set_suspend_disable,
322 };
323 
324 static const struct regulator_ops max77686_buck_dvs_ops = {
325 	.list_voltage		= regulator_list_voltage_linear,
326 	.map_voltage		= regulator_map_voltage_linear,
327 	.is_enabled		= regulator_is_enabled_regmap,
328 	.enable			= max77686_enable,
329 	.disable		= regulator_disable_regmap,
330 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
331 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
332 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
333 	.set_ramp_delay		= max77686_set_ramp_delay,
334 	.set_suspend_disable	= max77686_set_suspend_disable,
335 };
336 
337 #define regulator_desc_ldo(num)		{				\
338 	.name		= "LDO"#num,					\
339 	.of_match	= of_match_ptr("LDO"#num),			\
340 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
341 	.of_parse_cb	= max77686_of_parse_cb,				\
342 	.id		= MAX77686_LDO##num,				\
343 	.ops		= &max77686_ops,				\
344 	.type		= REGULATOR_VOLTAGE,				\
345 	.owner		= THIS_MODULE,					\
346 	.min_uV		= MAX77686_LDO_MINUV,				\
347 	.uV_step	= MAX77686_LDO_UVSTEP,				\
348 	.ramp_delay	= MAX77686_RAMP_DELAY,				\
349 	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
350 	.vsel_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
351 	.vsel_mask	= MAX77686_VSEL_MASK,				\
352 	.enable_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
353 	.enable_mask	= MAX77686_OPMODE_MASK				\
354 			<< MAX77686_OPMODE_SHIFT,			\
355 }
356 #define regulator_desc_lpm_ldo(num)	{				\
357 	.name		= "LDO"#num,					\
358 	.of_match	= of_match_ptr("LDO"#num),			\
359 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
360 	.id		= MAX77686_LDO##num,				\
361 	.ops		= &max77686_ldo_ops,				\
362 	.type		= REGULATOR_VOLTAGE,				\
363 	.owner		= THIS_MODULE,					\
364 	.min_uV		= MAX77686_LDO_MINUV,				\
365 	.uV_step	= MAX77686_LDO_UVSTEP,				\
366 	.ramp_delay	= MAX77686_RAMP_DELAY,				\
367 	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
368 	.vsel_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
369 	.vsel_mask	= MAX77686_VSEL_MASK,				\
370 	.enable_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
371 	.enable_mask	= MAX77686_OPMODE_MASK				\
372 			<< MAX77686_OPMODE_SHIFT,			\
373 }
374 #define regulator_desc_ldo_low(num)		{			\
375 	.name		= "LDO"#num,					\
376 	.of_match	= of_match_ptr("LDO"#num),			\
377 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
378 	.id		= MAX77686_LDO##num,				\
379 	.ops		= &max77686_ldo_ops,				\
380 	.type		= REGULATOR_VOLTAGE,				\
381 	.owner		= THIS_MODULE,					\
382 	.min_uV		= MAX77686_LDO_LOW_MINUV,			\
383 	.uV_step	= MAX77686_LDO_LOW_UVSTEP,			\
384 	.ramp_delay	= MAX77686_RAMP_DELAY,				\
385 	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
386 	.vsel_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
387 	.vsel_mask	= MAX77686_VSEL_MASK,				\
388 	.enable_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
389 	.enable_mask	= MAX77686_OPMODE_MASK				\
390 			<< MAX77686_OPMODE_SHIFT,			\
391 }
392 #define regulator_desc_ldo1_low(num)		{			\
393 	.name		= "LDO"#num,					\
394 	.of_match	= of_match_ptr("LDO"#num),			\
395 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
396 	.id		= MAX77686_LDO##num,				\
397 	.ops		= &max77686_ops,				\
398 	.type		= REGULATOR_VOLTAGE,				\
399 	.owner		= THIS_MODULE,					\
400 	.min_uV		= MAX77686_LDO_LOW_MINUV,			\
401 	.uV_step	= MAX77686_LDO_LOW_UVSTEP,			\
402 	.ramp_delay	= MAX77686_RAMP_DELAY,				\
403 	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
404 	.vsel_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
405 	.vsel_mask	= MAX77686_VSEL_MASK,				\
406 	.enable_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
407 	.enable_mask	= MAX77686_OPMODE_MASK				\
408 			<< MAX77686_OPMODE_SHIFT,			\
409 }
410 #define regulator_desc_buck(num)		{			\
411 	.name		= "BUCK"#num,					\
412 	.of_match	= of_match_ptr("BUCK"#num),			\
413 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
414 	.of_parse_cb	= max77686_of_parse_cb,				\
415 	.id		= MAX77686_BUCK##num,				\
416 	.ops		= &max77686_ops,				\
417 	.type		= REGULATOR_VOLTAGE,				\
418 	.owner		= THIS_MODULE,					\
419 	.min_uV		= MAX77686_BUCK_MINUV,				\
420 	.uV_step	= MAX77686_BUCK_UVSTEP,				\
421 	.ramp_delay	= MAX77686_RAMP_DELAY,				\
422 	.enable_time	= MAX77686_BUCK_ENABLE_TIME,			\
423 	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
424 	.vsel_reg	= MAX77686_REG_BUCK5OUT + (num - 5) * 2,	\
425 	.vsel_mask	= MAX77686_VSEL_MASK,				\
426 	.enable_reg	= MAX77686_REG_BUCK5CTRL + (num - 5) * 2,	\
427 	.enable_mask	= MAX77686_OPMODE_MASK,				\
428 }
429 #define regulator_desc_buck1(num)		{			\
430 	.name		= "BUCK"#num,					\
431 	.of_match	= of_match_ptr("BUCK"#num),			\
432 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
433 	.id		= MAX77686_BUCK##num,				\
434 	.ops		= &max77686_buck1_ops,				\
435 	.type		= REGULATOR_VOLTAGE,				\
436 	.owner		= THIS_MODULE,					\
437 	.min_uV		= MAX77686_BUCK_MINUV,				\
438 	.uV_step	= MAX77686_BUCK_UVSTEP,				\
439 	.ramp_delay	= MAX77686_RAMP_DELAY,				\
440 	.enable_time	= MAX77686_BUCK_ENABLE_TIME,			\
441 	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
442 	.vsel_reg	= MAX77686_REG_BUCK1OUT,			\
443 	.vsel_mask	= MAX77686_VSEL_MASK,				\
444 	.enable_reg	= MAX77686_REG_BUCK1CTRL,			\
445 	.enable_mask	= MAX77686_OPMODE_MASK,				\
446 }
447 #define regulator_desc_buck_dvs(num)		{			\
448 	.name		= "BUCK"#num,					\
449 	.of_match	= of_match_ptr("BUCK"#num),			\
450 	.regulators_node	= of_match_ptr("voltage-regulators"),	\
451 	.id		= MAX77686_BUCK##num,				\
452 	.ops		= &max77686_buck_dvs_ops,			\
453 	.type		= REGULATOR_VOLTAGE,				\
454 	.owner		= THIS_MODULE,					\
455 	.min_uV		= MAX77686_DVS_MINUV,				\
456 	.uV_step	= MAX77686_DVS_UVSTEP,				\
457 	.ramp_delay	= MAX77686_DVS_RAMP_DELAY,			\
458 	.enable_time	= MAX77686_DVS_ENABLE_TIME,			\
459 	.n_voltages	= MAX77686_DVS_VSEL_MASK + 1,			\
460 	.vsel_reg	= MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,	\
461 	.vsel_mask	= MAX77686_DVS_VSEL_MASK,			\
462 	.enable_reg	= MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,	\
463 	.enable_mask	= MAX77686_OPMODE_MASK				\
464 			<< MAX77686_OPMODE_BUCK234_SHIFT,		\
465 }
466 
467 static const struct regulator_desc regulators[] = {
468 	regulator_desc_ldo1_low(1),
469 	regulator_desc_ldo_low(2),
470 	regulator_desc_ldo(3),
471 	regulator_desc_ldo(4),
472 	regulator_desc_ldo(5),
473 	regulator_desc_ldo_low(6),
474 	regulator_desc_ldo_low(7),
475 	regulator_desc_ldo_low(8),
476 	regulator_desc_ldo(9),
477 	regulator_desc_lpm_ldo(10),
478 	regulator_desc_lpm_ldo(11),
479 	regulator_desc_lpm_ldo(12),
480 	regulator_desc_ldo(13),
481 	regulator_desc_lpm_ldo(14),
482 	regulator_desc_ldo_low(15),
483 	regulator_desc_lpm_ldo(16),
484 	regulator_desc_ldo(17),
485 	regulator_desc_ldo(18),
486 	regulator_desc_ldo(19),
487 	regulator_desc_ldo(20),
488 	regulator_desc_ldo(21),
489 	regulator_desc_ldo(22),
490 	regulator_desc_ldo(23),
491 	regulator_desc_ldo(24),
492 	regulator_desc_ldo(25),
493 	regulator_desc_ldo(26),
494 	regulator_desc_buck1(1),
495 	regulator_desc_buck_dvs(2),
496 	regulator_desc_buck_dvs(3),
497 	regulator_desc_buck_dvs(4),
498 	regulator_desc_buck(5),
499 	regulator_desc_buck(6),
500 	regulator_desc_buck(7),
501 	regulator_desc_buck(8),
502 	regulator_desc_buck(9),
503 };
504 
max77686_pmic_probe(struct platform_device * pdev)505 static int max77686_pmic_probe(struct platform_device *pdev)
506 {
507 	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
508 	struct max77686_data *max77686;
509 	int i;
510 	struct regulator_config config = { };
511 
512 	dev_dbg(&pdev->dev, "%s\n", __func__);
513 
514 	max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
515 				GFP_KERNEL);
516 	if (!max77686)
517 		return -ENOMEM;
518 
519 	max77686->dev = &pdev->dev;
520 	config.dev = iodev->dev;
521 	config.regmap = iodev->regmap;
522 	config.driver_data = max77686;
523 	platform_set_drvdata(pdev, max77686);
524 
525 	for (i = 0; i < MAX77686_REGULATORS; i++) {
526 		struct regulator_dev *rdev;
527 		int id = regulators[i].id;
528 
529 		max77686->opmode[id] = MAX77686_NORMAL;
530 		rdev = devm_regulator_register(&pdev->dev,
531 						&regulators[i], &config);
532 		if (IS_ERR(rdev)) {
533 			int ret = PTR_ERR(rdev);
534 			dev_err(&pdev->dev,
535 				"regulator init failed for %d: %d\n", i, ret);
536 			return ret;
537 		}
538 	}
539 
540 	return 0;
541 }
542 
543 static const struct platform_device_id max77686_pmic_id[] = {
544 	{"max77686-pmic", 0},
545 	{ },
546 };
547 MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
548 
549 static struct platform_driver max77686_pmic_driver = {
550 	.driver = {
551 		.name = "max77686-pmic",
552 	},
553 	.probe = max77686_pmic_probe,
554 	.id_table = max77686_pmic_id,
555 };
556 
557 module_platform_driver(max77686_pmic_driver);
558 
559 MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
560 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
561 MODULE_LICENSE("GPL");
562