1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max77802.c - Regulator driver for the Maxim 77802
4 //
5 // Copyright (C) 2013-2014 Google, Inc
6 // Simon Glass <sjg@chromium.org>
7 //
8 // Copyright (C) 2012 Samsung Electronics
9 // Chiwoong Byun <woong.byun@samsung.com>
10 // Jonghwa Lee <jonghwa3.lee@samsung.com>
11 //
12 // This driver is based on max8997.c
13 
14 #include <linux/kernel.h>
15 #include <linux/bug.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22 #include <linux/regulator/of_regulator.h>
23 #include <linux/mfd/max77686.h>
24 #include <linux/mfd/max77686-private.h>
25 #include <dt-bindings/regulator/maxim,max77802.h>
26 
27 /* Default ramp delay in case it is not manually set */
28 #define MAX77802_RAMP_DELAY		100000		/* uV/us */
29 
30 #define MAX77802_OPMODE_SHIFT_LDO	6
31 #define MAX77802_OPMODE_BUCK234_SHIFT	4
32 #define MAX77802_OPMODE_MASK		0x3
33 
34 #define MAX77802_VSEL_MASK		0x3F
35 #define MAX77802_DVS_VSEL_MASK		0xFF
36 
37 #define MAX77802_RAMP_RATE_MASK_2BIT	0xC0
38 #define MAX77802_RAMP_RATE_SHIFT_2BIT	6
39 #define MAX77802_RAMP_RATE_MASK_4BIT	0xF0
40 #define MAX77802_RAMP_RATE_SHIFT_4BIT	4
41 
42 #define MAX77802_STATUS_OFF		0x0
43 #define MAX77802_OFF_PWRREQ		0x1
44 #define MAX77802_LP_PWRREQ		0x2
45 
46 static const unsigned int max77802_buck234_ramp_table[] = {
47 	12500,
48 	25000,
49 	50000,
50 	100000,
51 };
52 
53 static const unsigned int max77802_buck16_ramp_table[] = {
54 	1000,	2000,	3030,	4000,
55 	5000,	5880,	7140,	8330,
56 	9090,	10000,	11110,	12500,
57 	16670,	25000,	50000,	100000,
58 };
59 
60 struct max77802_regulator_prv {
61 	/* Array indexed by regulator id */
62 	unsigned int opmode[MAX77802_REG_MAX];
63 };
64 
max77802_map_mode(unsigned int mode)65 static inline unsigned int max77802_map_mode(unsigned int mode)
66 {
67 	return mode == MAX77802_OPMODE_NORMAL ?
68 		REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
69 }
70 
max77802_get_opmode_shift(int id)71 static int max77802_get_opmode_shift(int id)
72 {
73 	if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
74 				     id <= MAX77802_BUCK10))
75 		return 0;
76 
77 	if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
78 		return MAX77802_OPMODE_BUCK234_SHIFT;
79 
80 	if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
81 		return MAX77802_OPMODE_SHIFT_LDO;
82 
83 	return -EINVAL;
84 }
85 
86 /**
87  * max77802_set_suspend_disable - Disable the regulator during system suspend
88  * @rdev: regulator to mark as disabled
89  *
90  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
91  * Configure the regulator so the PMIC will turn it OFF during system suspend.
92  */
max77802_set_suspend_disable(struct regulator_dev * rdev)93 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
94 {
95 	unsigned int val = MAX77802_OFF_PWRREQ;
96 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
97 	int id = rdev_get_id(rdev);
98 	int shift = max77802_get_opmode_shift(id);
99 
100 	max77802->opmode[id] = val;
101 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
102 				  rdev->desc->enable_mask, val << shift);
103 }
104 
105 /*
106  * Some LDOs support Low Power Mode while the system is running.
107  *
108  * LDOs 1, 3, 20, 21.
109  */
max77802_set_mode(struct regulator_dev * rdev,unsigned int mode)110 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
111 {
112 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
113 	int id = rdev_get_id(rdev);
114 	unsigned int val;
115 	int shift = max77802_get_opmode_shift(id);
116 
117 	switch (mode) {
118 	case REGULATOR_MODE_STANDBY:
119 		val = MAX77802_OPMODE_LP;	/* ON in Low Power Mode */
120 		break;
121 	case REGULATOR_MODE_NORMAL:
122 		val = MAX77802_OPMODE_NORMAL;	/* ON in Normal Mode */
123 		break;
124 	default:
125 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
126 			 rdev->desc->name, mode);
127 		return -EINVAL;
128 	}
129 
130 	max77802->opmode[id] = val;
131 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
132 				  rdev->desc->enable_mask, val << shift);
133 }
134 
max77802_get_mode(struct regulator_dev * rdev)135 static unsigned max77802_get_mode(struct regulator_dev *rdev)
136 {
137 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
138 	int id = rdev_get_id(rdev);
139 
140 	return max77802_map_mode(max77802->opmode[id]);
141 }
142 
143 /**
144  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
145  * @rdev: regulator to change mode
146  * @mode: operating mode to be set
147  *
148  * Will set the operating mode for the regulators during system suspend.
149  * This function is valid for the three different enable control logics:
150  *
151  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
152  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
153  * Enable Control Logic3 by PWRREQ (LDO 3)
154  *
155  * If setting the regulator mode fails, the function only warns but does
156  * not return an error code to avoid the regulator core to stop setting
157  * the operating mode for the remaining regulators.
158  */
max77802_set_suspend_mode(struct regulator_dev * rdev,unsigned int mode)159 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
160 				     unsigned int mode)
161 {
162 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
163 	int id = rdev_get_id(rdev);
164 	unsigned int val;
165 	int shift = max77802_get_opmode_shift(id);
166 
167 	/*
168 	 * If the regulator has been disabled for suspend
169 	 * then is invalid to try setting a suspend mode.
170 	 */
171 	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
172 		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
173 			 rdev->desc->name, mode);
174 		return 0;
175 	}
176 
177 	switch (mode) {
178 	case REGULATOR_MODE_STANDBY:
179 		/*
180 		 * If the regulator opmode is normal then enable
181 		 * ON in Low Power Mode by PWRREQ. If the mode is
182 		 * already Low Power then no action is required.
183 		 */
184 		if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
185 			val = MAX77802_LP_PWRREQ;
186 		else
187 			return 0;
188 		break;
189 	case REGULATOR_MODE_NORMAL:
190 		/*
191 		 * If the regulator operating mode is Low Power then
192 		 * normal is not a valid opmode in suspend. If the
193 		 * mode is already normal then no action is required.
194 		 */
195 		if (max77802->opmode[id] == MAX77802_OPMODE_LP)
196 			dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
197 				 rdev->desc->name, mode);
198 		return 0;
199 	default:
200 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
201 			 rdev->desc->name, mode);
202 		return -EINVAL;
203 	}
204 
205 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
206 				  rdev->desc->enable_mask, val << shift);
207 }
208 
max77802_enable(struct regulator_dev * rdev)209 static int max77802_enable(struct regulator_dev *rdev)
210 {
211 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
212 	int id = rdev_get_id(rdev);
213 	int shift = max77802_get_opmode_shift(id);
214 
215 	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
216 		max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
217 
218 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
219 				  rdev->desc->enable_mask,
220 				  max77802->opmode[id] << shift);
221 }
222 
223 /*
224  * LDOs 2, 4-19, 22-35
225  */
226 static const struct regulator_ops max77802_ldo_ops_logic1 = {
227 	.list_voltage		= regulator_list_voltage_linear,
228 	.map_voltage		= regulator_map_voltage_linear,
229 	.is_enabled		= regulator_is_enabled_regmap,
230 	.enable			= max77802_enable,
231 	.disable		= regulator_disable_regmap,
232 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
233 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
234 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
235 	.set_suspend_disable	= max77802_set_suspend_disable,
236 	.set_suspend_mode	= max77802_set_suspend_mode,
237 };
238 
239 /*
240  * LDOs 1, 20, 21, 3
241  */
242 static const struct regulator_ops max77802_ldo_ops_logic2 = {
243 	.list_voltage		= regulator_list_voltage_linear,
244 	.map_voltage		= regulator_map_voltage_linear,
245 	.is_enabled		= regulator_is_enabled_regmap,
246 	.enable			= max77802_enable,
247 	.disable		= regulator_disable_regmap,
248 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
249 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
250 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
251 	.set_mode		= max77802_set_mode,
252 	.get_mode		= max77802_get_mode,
253 	.set_suspend_mode	= max77802_set_suspend_mode,
254 };
255 
256 /* BUCKS 1, 6 */
257 static const struct regulator_ops max77802_buck_16_dvs_ops = {
258 	.list_voltage		= regulator_list_voltage_linear,
259 	.map_voltage		= regulator_map_voltage_linear,
260 	.is_enabled		= regulator_is_enabled_regmap,
261 	.enable			= max77802_enable,
262 	.disable		= regulator_disable_regmap,
263 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
264 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
265 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
266 	.set_ramp_delay		= regulator_set_ramp_delay_regmap,
267 	.set_suspend_disable	= max77802_set_suspend_disable,
268 };
269 
270 /* BUCKs 2-4 */
271 static const struct regulator_ops max77802_buck_234_ops = {
272 	.list_voltage		= regulator_list_voltage_linear,
273 	.map_voltage		= regulator_map_voltage_linear,
274 	.is_enabled		= regulator_is_enabled_regmap,
275 	.enable			= max77802_enable,
276 	.disable		= regulator_disable_regmap,
277 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
278 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
279 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
280 	.set_ramp_delay		= regulator_set_ramp_delay_regmap,
281 	.set_suspend_disable	= max77802_set_suspend_disable,
282 	.set_suspend_mode	= max77802_set_suspend_mode,
283 };
284 
285 /* BUCKs 5, 7-10 */
286 static const struct regulator_ops max77802_buck_dvs_ops = {
287 	.list_voltage		= regulator_list_voltage_linear,
288 	.map_voltage		= regulator_map_voltage_linear,
289 	.is_enabled		= regulator_is_enabled_regmap,
290 	.enable			= max77802_enable,
291 	.disable		= regulator_disable_regmap,
292 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
293 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
294 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
295 	.set_suspend_disable	= max77802_set_suspend_disable,
296 };
297 
298 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
299 #define regulator_77802_desc_p_ldo(num, supply, log)	{		\
300 	.name		= "LDO"#num,					\
301 	.of_match	= of_match_ptr("LDO"#num),			\
302 	.regulators_node	= of_match_ptr("regulators"),		\
303 	.id		= MAX77802_LDO##num,				\
304 	.supply_name	= "inl"#supply,					\
305 	.ops		= &max77802_ldo_ops_logic##log,			\
306 	.type		= REGULATOR_VOLTAGE,				\
307 	.owner		= THIS_MODULE,					\
308 	.min_uV		= 800000,					\
309 	.uV_step	= 50000,					\
310 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
311 	.n_voltages	= 1 << 6,					\
312 	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
313 	.vsel_mask	= MAX77802_VSEL_MASK,				\
314 	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
315 	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
316 	.of_map_mode	= max77802_map_mode,				\
317 }
318 
319 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
320 #define regulator_77802_desc_n_ldo(num, supply, log)   {		\
321 	.name		= "LDO"#num,					\
322 	.of_match	= of_match_ptr("LDO"#num),			\
323 	.regulators_node	= of_match_ptr("regulators"),		\
324 	.id		= MAX77802_LDO##num,				\
325 	.supply_name	= "inl"#supply,					\
326 	.ops		= &max77802_ldo_ops_logic##log,			\
327 	.type		= REGULATOR_VOLTAGE,				\
328 	.owner		= THIS_MODULE,					\
329 	.min_uV		= 800000,					\
330 	.uV_step	= 25000,					\
331 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
332 	.n_voltages	= 1 << 6,					\
333 	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
334 	.vsel_mask	= MAX77802_VSEL_MASK,				\
335 	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
336 	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
337 	.of_map_mode	= max77802_map_mode,				\
338 }
339 
340 /* BUCKs 1, 6 */
341 #define regulator_77802_desc_16_buck(num)	{		\
342 	.name		= "BUCK"#num,					\
343 	.of_match	= of_match_ptr("BUCK"#num),			\
344 	.regulators_node	= of_match_ptr("regulators"),		\
345 	.id		= MAX77802_BUCK##num,				\
346 	.supply_name	= "inb"#num,					\
347 	.ops		= &max77802_buck_16_dvs_ops,			\
348 	.type		= REGULATOR_VOLTAGE,				\
349 	.owner		= THIS_MODULE,					\
350 	.min_uV		= 612500,					\
351 	.uV_step	= 6250,						\
352 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
353 	.n_voltages	= 1 << 8,					\
354 	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
355 	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
356 	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL,		\
357 	.enable_mask	= MAX77802_OPMODE_MASK,				\
358 	.ramp_reg	= MAX77802_REG_BUCK ## num ## CTRL,		\
359 	.ramp_mask	= MAX77802_RAMP_RATE_MASK_4BIT,			\
360 	.ramp_delay_table = max77802_buck16_ramp_table,			\
361 	.n_ramp_values	= ARRAY_SIZE(max77802_buck16_ramp_table),	\
362 	.of_map_mode	= max77802_map_mode,				\
363 }
364 
365 /* BUCKS 2-4 */
366 #define regulator_77802_desc_234_buck(num)	{		\
367 	.name		= "BUCK"#num,					\
368 	.of_match	= of_match_ptr("BUCK"#num),			\
369 	.regulators_node	= of_match_ptr("regulators"),		\
370 	.id		= MAX77802_BUCK##num,				\
371 	.supply_name	= "inb"#num,					\
372 	.ops		= &max77802_buck_234_ops,			\
373 	.type		= REGULATOR_VOLTAGE,				\
374 	.owner		= THIS_MODULE,					\
375 	.min_uV		= 600000,					\
376 	.uV_step	= 6250,						\
377 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
378 	.n_voltages	= 0x91,						\
379 	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
380 	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
381 	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL1,		\
382 	.enable_mask	= MAX77802_OPMODE_MASK <<			\
383 				MAX77802_OPMODE_BUCK234_SHIFT,		\
384 	.ramp_reg	= MAX77802_REG_BUCK ## num ## CTRL1,		\
385 	.ramp_mask	= MAX77802_RAMP_RATE_MASK_2BIT,			\
386 	.ramp_delay_table = max77802_buck234_ramp_table,		\
387 	.n_ramp_values	= ARRAY_SIZE(max77802_buck234_ramp_table),	\
388 	.of_map_mode	= max77802_map_mode,				\
389 }
390 
391 /* BUCK 5 */
392 #define regulator_77802_desc_buck5(num)		{		\
393 	.name		= "BUCK"#num,					\
394 	.of_match	= of_match_ptr("BUCK"#num),			\
395 	.regulators_node	= of_match_ptr("regulators"),		\
396 	.id		= MAX77802_BUCK##num,				\
397 	.supply_name	= "inb"#num,					\
398 	.ops		= &max77802_buck_dvs_ops,			\
399 	.type		= REGULATOR_VOLTAGE,				\
400 	.owner		= THIS_MODULE,					\
401 	.min_uV		= 750000,					\
402 	.uV_step	= 50000,					\
403 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
404 	.n_voltages	= 1 << 6,					\
405 	.vsel_reg	= MAX77802_REG_BUCK5OUT,			\
406 	.vsel_mask	= MAX77802_VSEL_MASK,				\
407 	.enable_reg	= MAX77802_REG_BUCK5CTRL,			\
408 	.enable_mask	= MAX77802_OPMODE_MASK,				\
409 	.of_map_mode	= max77802_map_mode,				\
410 }
411 
412 /* BUCKs 7-10 */
413 #define regulator_77802_desc_buck7_10(num)	{		\
414 	.name		= "BUCK"#num,					\
415 	.of_match	= of_match_ptr("BUCK"#num),			\
416 	.regulators_node	= of_match_ptr("regulators"),		\
417 	.id		= MAX77802_BUCK##num,				\
418 	.supply_name	= "inb"#num,					\
419 	.ops		= &max77802_buck_dvs_ops,			\
420 	.type		= REGULATOR_VOLTAGE,				\
421 	.owner		= THIS_MODULE,					\
422 	.min_uV		= 750000,					\
423 	.uV_step	= 50000,					\
424 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
425 	.n_voltages	= 1 << 6,					\
426 	.vsel_reg	= MAX77802_REG_BUCK7OUT + (num - 7) * 3,	\
427 	.vsel_mask	= MAX77802_VSEL_MASK,				\
428 	.enable_reg	= MAX77802_REG_BUCK7CTRL + (num - 7) * 3,	\
429 	.enable_mask	= MAX77802_OPMODE_MASK,				\
430 	.of_map_mode	= max77802_map_mode,				\
431 }
432 
433 static const struct regulator_desc regulators[] = {
434 	regulator_77802_desc_16_buck(1),
435 	regulator_77802_desc_234_buck(2),
436 	regulator_77802_desc_234_buck(3),
437 	regulator_77802_desc_234_buck(4),
438 	regulator_77802_desc_buck5(5),
439 	regulator_77802_desc_16_buck(6),
440 	regulator_77802_desc_buck7_10(7),
441 	regulator_77802_desc_buck7_10(8),
442 	regulator_77802_desc_buck7_10(9),
443 	regulator_77802_desc_buck7_10(10),
444 	regulator_77802_desc_n_ldo(1, 10, 2),
445 	regulator_77802_desc_n_ldo(2, 10, 1),
446 	regulator_77802_desc_p_ldo(3, 3, 2),
447 	regulator_77802_desc_p_ldo(4, 6, 1),
448 	regulator_77802_desc_p_ldo(5, 3, 1),
449 	regulator_77802_desc_p_ldo(6, 3, 1),
450 	regulator_77802_desc_p_ldo(7, 3, 1),
451 	regulator_77802_desc_n_ldo(8, 1, 1),
452 	regulator_77802_desc_p_ldo(9, 5, 1),
453 	regulator_77802_desc_p_ldo(10, 4, 1),
454 	regulator_77802_desc_p_ldo(11, 4, 1),
455 	regulator_77802_desc_p_ldo(12, 9, 1),
456 	regulator_77802_desc_p_ldo(13, 4, 1),
457 	regulator_77802_desc_p_ldo(14, 4, 1),
458 	regulator_77802_desc_n_ldo(15, 1, 1),
459 	regulator_77802_desc_n_ldo(17, 2, 1),
460 	regulator_77802_desc_p_ldo(18, 7, 1),
461 	regulator_77802_desc_p_ldo(19, 5, 1),
462 	regulator_77802_desc_p_ldo(20, 7, 2),
463 	regulator_77802_desc_p_ldo(21, 6, 2),
464 	regulator_77802_desc_p_ldo(23, 9, 1),
465 	regulator_77802_desc_p_ldo(24, 6, 1),
466 	regulator_77802_desc_p_ldo(25, 9, 1),
467 	regulator_77802_desc_p_ldo(26, 9, 1),
468 	regulator_77802_desc_n_ldo(27, 2, 1),
469 	regulator_77802_desc_p_ldo(28, 7, 1),
470 	regulator_77802_desc_p_ldo(29, 7, 1),
471 	regulator_77802_desc_n_ldo(30, 2, 1),
472 	regulator_77802_desc_p_ldo(32, 9, 1),
473 	regulator_77802_desc_p_ldo(33, 6, 1),
474 	regulator_77802_desc_p_ldo(34, 9, 1),
475 	regulator_77802_desc_n_ldo(35, 2, 1),
476 };
477 
max77802_pmic_probe(struct platform_device * pdev)478 static int max77802_pmic_probe(struct platform_device *pdev)
479 {
480 	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
481 	struct max77802_regulator_prv *max77802;
482 	int i, val;
483 	struct regulator_config config = { };
484 
485 	max77802 = devm_kzalloc(&pdev->dev,
486 				sizeof(struct max77802_regulator_prv),
487 				GFP_KERNEL);
488 	if (!max77802)
489 		return -ENOMEM;
490 
491 	config.dev = iodev->dev;
492 	config.regmap = iodev->regmap;
493 	config.driver_data = max77802;
494 	platform_set_drvdata(pdev, max77802);
495 
496 	for (i = 0; i < MAX77802_REG_MAX; i++) {
497 		struct regulator_dev *rdev;
498 		int id = regulators[i].id;
499 		int shift = max77802_get_opmode_shift(id);
500 		int ret;
501 
502 		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
503 		if (ret < 0) {
504 			dev_warn(&pdev->dev,
505 				"cannot read current mode for %d\n", i);
506 			val = MAX77802_OPMODE_NORMAL;
507 		} else {
508 			val = val >> shift & MAX77802_OPMODE_MASK;
509 		}
510 
511 		/*
512 		 * If the regulator is disabled and the system warm rebooted,
513 		 * the hardware reports OFF as the regulator operating mode.
514 		 * Default to operating mode NORMAL in that case.
515 		 */
516 		if (val == MAX77802_STATUS_OFF)
517 			max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
518 		else
519 			max77802->opmode[id] = val;
520 
521 		rdev = devm_regulator_register(&pdev->dev,
522 					       &regulators[i], &config);
523 		if (IS_ERR(rdev)) {
524 			ret = PTR_ERR(rdev);
525 			dev_err(&pdev->dev,
526 				"regulator init failed for %d: %d\n", i, ret);
527 			return ret;
528 		}
529 	}
530 
531 	return 0;
532 }
533 
534 static const struct platform_device_id max77802_pmic_id[] = {
535 	{"max77802-pmic", 0},
536 	{ },
537 };
538 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
539 
540 static struct platform_driver max77802_pmic_driver = {
541 	.driver = {
542 		.name = "max77802-pmic",
543 	},
544 	.probe = max77802_pmic_probe,
545 	.id_table = max77802_pmic_id,
546 };
547 
548 module_platform_driver(max77802_pmic_driver);
549 
550 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
551 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
552 MODULE_LICENSE("GPL");
553