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 /* MAX77802 has two register formats: 2-bit and 4-bit */
47 static const unsigned int ramp_table_77802_2bit[] = {
48 	12500,
49 	25000,
50 	50000,
51 	100000,
52 };
53 
54 static unsigned int ramp_table_77802_4bit[] = {
55 	1000,	2000,	3030,	4000,
56 	5000,	5880,	7140,	8330,
57 	9090,	10000,	11110,	12500,
58 	16670,	25000,	50000,	100000,
59 };
60 
61 struct max77802_regulator_prv {
62 	/* Array indexed by regulator id */
63 	unsigned int opmode[MAX77802_REG_MAX];
64 };
65 
max77802_map_mode(unsigned int mode)66 static inline unsigned int max77802_map_mode(unsigned int mode)
67 {
68 	return mode == MAX77802_OPMODE_NORMAL ?
69 		REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
70 }
71 
max77802_get_opmode_shift(int id)72 static int max77802_get_opmode_shift(int id)
73 {
74 	if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
75 				     id <= MAX77802_BUCK10))
76 		return 0;
77 
78 	if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
79 		return MAX77802_OPMODE_BUCK234_SHIFT;
80 
81 	if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
82 		return MAX77802_OPMODE_SHIFT_LDO;
83 
84 	return -EINVAL;
85 }
86 
87 /**
88  * max77802_set_suspend_disable - Disable the regulator during system suspend
89  * @rdev: regulator to mark as disabled
90  *
91  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
92  * Configure the regulator so the PMIC will turn it OFF during system suspend.
93  */
max77802_set_suspend_disable(struct regulator_dev * rdev)94 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
95 {
96 	unsigned int val = MAX77802_OFF_PWRREQ;
97 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
98 	int id = rdev_get_id(rdev);
99 	int shift = max77802_get_opmode_shift(id);
100 
101 	max77802->opmode[id] = val;
102 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
103 				  rdev->desc->enable_mask, val << shift);
104 }
105 
106 /*
107  * Some LDOs support Low Power Mode while the system is running.
108  *
109  * LDOs 1, 3, 20, 21.
110  */
max77802_set_mode(struct regulator_dev * rdev,unsigned int mode)111 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
112 {
113 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
114 	int id = rdev_get_id(rdev);
115 	unsigned int val;
116 	int shift = max77802_get_opmode_shift(id);
117 
118 	switch (mode) {
119 	case REGULATOR_MODE_STANDBY:
120 		val = MAX77802_OPMODE_LP;	/* ON in Low Power Mode */
121 		break;
122 	case REGULATOR_MODE_NORMAL:
123 		val = MAX77802_OPMODE_NORMAL;	/* ON in Normal Mode */
124 		break;
125 	default:
126 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
127 			 rdev->desc->name, mode);
128 		return -EINVAL;
129 	}
130 
131 	max77802->opmode[id] = val;
132 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
133 				  rdev->desc->enable_mask, val << shift);
134 }
135 
max77802_get_mode(struct regulator_dev * rdev)136 static unsigned max77802_get_mode(struct regulator_dev *rdev)
137 {
138 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
139 	int id = rdev_get_id(rdev);
140 
141 	return max77802_map_mode(max77802->opmode[id]);
142 }
143 
144 /**
145  * max77802_set_suspend_mode - set regulator opmode when the system is suspended
146  * @rdev: regulator to change mode
147  * @mode: operating mode to be set
148  *
149  * Will set the operating mode for the regulators during system suspend.
150  * This function is valid for the three different enable control logics:
151  *
152  * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
153  * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
154  * Enable Control Logic3 by PWRREQ (LDO 3)
155  *
156  * If setting the regulator mode fails, the function only warns but does
157  * not return an error code to avoid the regulator core to stop setting
158  * the operating mode for the remaining regulators.
159  */
max77802_set_suspend_mode(struct regulator_dev * rdev,unsigned int mode)160 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
161 				     unsigned int mode)
162 {
163 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
164 	int id = rdev_get_id(rdev);
165 	unsigned int val;
166 	int shift = max77802_get_opmode_shift(id);
167 
168 	/*
169 	 * If the regulator has been disabled for suspend
170 	 * then is invalid to try setting a suspend mode.
171 	 */
172 	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
173 		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
174 			 rdev->desc->name, mode);
175 		return 0;
176 	}
177 
178 	switch (mode) {
179 	case REGULATOR_MODE_STANDBY:
180 		/*
181 		 * If the regulator opmode is normal then enable
182 		 * ON in Low Power Mode by PWRREQ. If the mode is
183 		 * already Low Power then no action is required.
184 		 */
185 		if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
186 			val = MAX77802_LP_PWRREQ;
187 		else
188 			return 0;
189 		break;
190 	case REGULATOR_MODE_NORMAL:
191 		/*
192 		 * If the regulator operating mode is Low Power then
193 		 * normal is not a valid opmode in suspend. If the
194 		 * mode is already normal then no action is required.
195 		 */
196 		if (max77802->opmode[id] == MAX77802_OPMODE_LP)
197 			dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
198 				 rdev->desc->name, mode);
199 		return 0;
200 	default:
201 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
202 			 rdev->desc->name, mode);
203 		return -EINVAL;
204 	}
205 
206 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
207 				  rdev->desc->enable_mask, val << shift);
208 }
209 
max77802_enable(struct regulator_dev * rdev)210 static int max77802_enable(struct regulator_dev *rdev)
211 {
212 	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
213 	int id = rdev_get_id(rdev);
214 	int shift = max77802_get_opmode_shift(id);
215 
216 	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
217 		max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
218 
219 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
220 				  rdev->desc->enable_mask,
221 				  max77802->opmode[id] << shift);
222 }
223 
max77802_find_ramp_value(struct regulator_dev * rdev,const unsigned int limits[],int size,unsigned int ramp_delay)224 static int max77802_find_ramp_value(struct regulator_dev *rdev,
225 				    const unsigned int limits[], int size,
226 				    unsigned int ramp_delay)
227 {
228 	int i;
229 
230 	for (i = 0; i < size; i++) {
231 		if (ramp_delay <= limits[i])
232 			return i;
233 	}
234 
235 	/* Use maximum value for no ramp control */
236 	dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
237 		 rdev->desc->name, ramp_delay);
238 	return size - 1;
239 }
240 
241 /* Used for BUCKs 2-4 */
max77802_set_ramp_delay_2bit(struct regulator_dev * rdev,int ramp_delay)242 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
243 					int ramp_delay)
244 {
245 	int id = rdev_get_id(rdev);
246 	unsigned int ramp_value;
247 
248 	if (id > MAX77802_BUCK4) {
249 		dev_warn(&rdev->dev,
250 			 "%s: regulator: ramp delay not supported\n",
251 			 rdev->desc->name);
252 		return -EINVAL;
253 	}
254 	ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
255 				ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
256 
257 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
258 				  MAX77802_RAMP_RATE_MASK_2BIT,
259 				  ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
260 }
261 
262 /* For BUCK1, 6 */
max77802_set_ramp_delay_4bit(struct regulator_dev * rdev,int ramp_delay)263 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
264 					    int ramp_delay)
265 {
266 	unsigned int ramp_value;
267 
268 	ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
269 				ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
270 
271 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
272 				  MAX77802_RAMP_RATE_MASK_4BIT,
273 				  ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
274 }
275 
276 /*
277  * LDOs 2, 4-19, 22-35
278  */
279 static const struct regulator_ops max77802_ldo_ops_logic1 = {
280 	.list_voltage		= regulator_list_voltage_linear,
281 	.map_voltage		= regulator_map_voltage_linear,
282 	.is_enabled		= regulator_is_enabled_regmap,
283 	.enable			= max77802_enable,
284 	.disable		= regulator_disable_regmap,
285 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
286 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
287 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
288 	.set_suspend_disable	= max77802_set_suspend_disable,
289 	.set_suspend_mode	= max77802_set_suspend_mode,
290 };
291 
292 /*
293  * LDOs 1, 20, 21, 3
294  */
295 static const struct regulator_ops max77802_ldo_ops_logic2 = {
296 	.list_voltage		= regulator_list_voltage_linear,
297 	.map_voltage		= regulator_map_voltage_linear,
298 	.is_enabled		= regulator_is_enabled_regmap,
299 	.enable			= max77802_enable,
300 	.disable		= regulator_disable_regmap,
301 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
302 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
303 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
304 	.set_mode		= max77802_set_mode,
305 	.get_mode		= max77802_get_mode,
306 	.set_suspend_mode	= max77802_set_suspend_mode,
307 };
308 
309 /* BUCKS 1, 6 */
310 static const struct regulator_ops max77802_buck_16_dvs_ops = {
311 	.list_voltage		= regulator_list_voltage_linear,
312 	.map_voltage		= regulator_map_voltage_linear,
313 	.is_enabled		= regulator_is_enabled_regmap,
314 	.enable			= max77802_enable,
315 	.disable		= regulator_disable_regmap,
316 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
317 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
318 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
319 	.set_ramp_delay		= max77802_set_ramp_delay_4bit,
320 	.set_suspend_disable	= max77802_set_suspend_disable,
321 };
322 
323 /* BUCKs 2-4 */
324 static const struct regulator_ops max77802_buck_234_ops = {
325 	.list_voltage		= regulator_list_voltage_linear,
326 	.map_voltage		= regulator_map_voltage_linear,
327 	.is_enabled		= regulator_is_enabled_regmap,
328 	.enable			= max77802_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		= max77802_set_ramp_delay_2bit,
334 	.set_suspend_disable	= max77802_set_suspend_disable,
335 	.set_suspend_mode	= max77802_set_suspend_mode,
336 };
337 
338 /* BUCKs 5, 7-10 */
339 static const struct regulator_ops max77802_buck_dvs_ops = {
340 	.list_voltage		= regulator_list_voltage_linear,
341 	.map_voltage		= regulator_map_voltage_linear,
342 	.is_enabled		= regulator_is_enabled_regmap,
343 	.enable			= max77802_enable,
344 	.disable		= regulator_disable_regmap,
345 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
346 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
347 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
348 	.set_ramp_delay		= max77802_set_ramp_delay_2bit,
349 	.set_suspend_disable	= max77802_set_suspend_disable,
350 };
351 
352 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
353 #define regulator_77802_desc_p_ldo(num, supply, log)	{		\
354 	.name		= "LDO"#num,					\
355 	.of_match	= of_match_ptr("LDO"#num),			\
356 	.regulators_node	= of_match_ptr("regulators"),		\
357 	.id		= MAX77802_LDO##num,				\
358 	.supply_name	= "inl"#supply,					\
359 	.ops		= &max77802_ldo_ops_logic##log,			\
360 	.type		= REGULATOR_VOLTAGE,				\
361 	.owner		= THIS_MODULE,					\
362 	.min_uV		= 800000,					\
363 	.uV_step	= 50000,					\
364 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
365 	.n_voltages	= 1 << 6,					\
366 	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
367 	.vsel_mask	= MAX77802_VSEL_MASK,				\
368 	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
369 	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
370 	.of_map_mode	= max77802_map_mode,				\
371 }
372 
373 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
374 #define regulator_77802_desc_n_ldo(num, supply, log)   {		\
375 	.name		= "LDO"#num,					\
376 	.of_match	= of_match_ptr("LDO"#num),			\
377 	.regulators_node	= of_match_ptr("regulators"),		\
378 	.id		= MAX77802_LDO##num,				\
379 	.supply_name	= "inl"#supply,					\
380 	.ops		= &max77802_ldo_ops_logic##log,			\
381 	.type		= REGULATOR_VOLTAGE,				\
382 	.owner		= THIS_MODULE,					\
383 	.min_uV		= 800000,					\
384 	.uV_step	= 25000,					\
385 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
386 	.n_voltages	= 1 << 6,					\
387 	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
388 	.vsel_mask	= MAX77802_VSEL_MASK,				\
389 	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
390 	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
391 	.of_map_mode	= max77802_map_mode,				\
392 }
393 
394 /* BUCKs 1, 6 */
395 #define regulator_77802_desc_16_buck(num)	{		\
396 	.name		= "BUCK"#num,					\
397 	.of_match	= of_match_ptr("BUCK"#num),			\
398 	.regulators_node	= of_match_ptr("regulators"),		\
399 	.id		= MAX77802_BUCK##num,				\
400 	.supply_name	= "inb"#num,					\
401 	.ops		= &max77802_buck_16_dvs_ops,			\
402 	.type		= REGULATOR_VOLTAGE,				\
403 	.owner		= THIS_MODULE,					\
404 	.min_uV		= 612500,					\
405 	.uV_step	= 6250,						\
406 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
407 	.n_voltages	= 1 << 8,					\
408 	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
409 	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
410 	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL,		\
411 	.enable_mask	= MAX77802_OPMODE_MASK,				\
412 	.of_map_mode	= max77802_map_mode,				\
413 }
414 
415 /* BUCKS 2-4 */
416 #define regulator_77802_desc_234_buck(num)	{		\
417 	.name		= "BUCK"#num,					\
418 	.of_match	= of_match_ptr("BUCK"#num),			\
419 	.regulators_node	= of_match_ptr("regulators"),		\
420 	.id		= MAX77802_BUCK##num,				\
421 	.supply_name	= "inb"#num,					\
422 	.ops		= &max77802_buck_234_ops,			\
423 	.type		= REGULATOR_VOLTAGE,				\
424 	.owner		= THIS_MODULE,					\
425 	.min_uV		= 600000,					\
426 	.uV_step	= 6250,						\
427 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
428 	.n_voltages	= 0x91,						\
429 	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
430 	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
431 	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL1,		\
432 	.enable_mask	= MAX77802_OPMODE_MASK <<			\
433 				MAX77802_OPMODE_BUCK234_SHIFT,		\
434 	.of_map_mode	= max77802_map_mode,				\
435 }
436 
437 /* BUCK 5 */
438 #define regulator_77802_desc_buck5(num)		{		\
439 	.name		= "BUCK"#num,					\
440 	.of_match	= of_match_ptr("BUCK"#num),			\
441 	.regulators_node	= of_match_ptr("regulators"),		\
442 	.id		= MAX77802_BUCK##num,				\
443 	.supply_name	= "inb"#num,					\
444 	.ops		= &max77802_buck_dvs_ops,			\
445 	.type		= REGULATOR_VOLTAGE,				\
446 	.owner		= THIS_MODULE,					\
447 	.min_uV		= 750000,					\
448 	.uV_step	= 50000,					\
449 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
450 	.n_voltages	= 1 << 6,					\
451 	.vsel_reg	= MAX77802_REG_BUCK5OUT,			\
452 	.vsel_mask	= MAX77802_VSEL_MASK,				\
453 	.enable_reg	= MAX77802_REG_BUCK5CTRL,			\
454 	.enable_mask	= MAX77802_OPMODE_MASK,				\
455 	.of_map_mode	= max77802_map_mode,				\
456 }
457 
458 /* BUCKs 7-10 */
459 #define regulator_77802_desc_buck7_10(num)	{		\
460 	.name		= "BUCK"#num,					\
461 	.of_match	= of_match_ptr("BUCK"#num),			\
462 	.regulators_node	= of_match_ptr("regulators"),		\
463 	.id		= MAX77802_BUCK##num,				\
464 	.supply_name	= "inb"#num,					\
465 	.ops		= &max77802_buck_dvs_ops,			\
466 	.type		= REGULATOR_VOLTAGE,				\
467 	.owner		= THIS_MODULE,					\
468 	.min_uV		= 750000,					\
469 	.uV_step	= 50000,					\
470 	.ramp_delay	= MAX77802_RAMP_DELAY,				\
471 	.n_voltages	= 1 << 6,					\
472 	.vsel_reg	= MAX77802_REG_BUCK7OUT + (num - 7) * 3,	\
473 	.vsel_mask	= MAX77802_VSEL_MASK,				\
474 	.enable_reg	= MAX77802_REG_BUCK7CTRL + (num - 7) * 3,	\
475 	.enable_mask	= MAX77802_OPMODE_MASK,				\
476 	.of_map_mode	= max77802_map_mode,				\
477 }
478 
479 static const struct regulator_desc regulators[] = {
480 	regulator_77802_desc_16_buck(1),
481 	regulator_77802_desc_234_buck(2),
482 	regulator_77802_desc_234_buck(3),
483 	regulator_77802_desc_234_buck(4),
484 	regulator_77802_desc_buck5(5),
485 	regulator_77802_desc_16_buck(6),
486 	regulator_77802_desc_buck7_10(7),
487 	regulator_77802_desc_buck7_10(8),
488 	regulator_77802_desc_buck7_10(9),
489 	regulator_77802_desc_buck7_10(10),
490 	regulator_77802_desc_n_ldo(1, 10, 2),
491 	regulator_77802_desc_n_ldo(2, 10, 1),
492 	regulator_77802_desc_p_ldo(3, 3, 2),
493 	regulator_77802_desc_p_ldo(4, 6, 1),
494 	regulator_77802_desc_p_ldo(5, 3, 1),
495 	regulator_77802_desc_p_ldo(6, 3, 1),
496 	regulator_77802_desc_p_ldo(7, 3, 1),
497 	regulator_77802_desc_n_ldo(8, 1, 1),
498 	regulator_77802_desc_p_ldo(9, 5, 1),
499 	regulator_77802_desc_p_ldo(10, 4, 1),
500 	regulator_77802_desc_p_ldo(11, 4, 1),
501 	regulator_77802_desc_p_ldo(12, 9, 1),
502 	regulator_77802_desc_p_ldo(13, 4, 1),
503 	regulator_77802_desc_p_ldo(14, 4, 1),
504 	regulator_77802_desc_n_ldo(15, 1, 1),
505 	regulator_77802_desc_n_ldo(17, 2, 1),
506 	regulator_77802_desc_p_ldo(18, 7, 1),
507 	regulator_77802_desc_p_ldo(19, 5, 1),
508 	regulator_77802_desc_p_ldo(20, 7, 2),
509 	regulator_77802_desc_p_ldo(21, 6, 2),
510 	regulator_77802_desc_p_ldo(23, 9, 1),
511 	regulator_77802_desc_p_ldo(24, 6, 1),
512 	regulator_77802_desc_p_ldo(25, 9, 1),
513 	regulator_77802_desc_p_ldo(26, 9, 1),
514 	regulator_77802_desc_n_ldo(27, 2, 1),
515 	regulator_77802_desc_p_ldo(28, 7, 1),
516 	regulator_77802_desc_p_ldo(29, 7, 1),
517 	regulator_77802_desc_n_ldo(30, 2, 1),
518 	regulator_77802_desc_p_ldo(32, 9, 1),
519 	regulator_77802_desc_p_ldo(33, 6, 1),
520 	regulator_77802_desc_p_ldo(34, 9, 1),
521 	regulator_77802_desc_n_ldo(35, 2, 1),
522 };
523 
max77802_pmic_probe(struct platform_device * pdev)524 static int max77802_pmic_probe(struct platform_device *pdev)
525 {
526 	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
527 	struct max77802_regulator_prv *max77802;
528 	int i, val;
529 	struct regulator_config config = { };
530 
531 	max77802 = devm_kzalloc(&pdev->dev,
532 				sizeof(struct max77802_regulator_prv),
533 				GFP_KERNEL);
534 	if (!max77802)
535 		return -ENOMEM;
536 
537 	config.dev = iodev->dev;
538 	config.regmap = iodev->regmap;
539 	config.driver_data = max77802;
540 	platform_set_drvdata(pdev, max77802);
541 
542 	for (i = 0; i < MAX77802_REG_MAX; i++) {
543 		struct regulator_dev *rdev;
544 		int id = regulators[i].id;
545 		int shift = max77802_get_opmode_shift(id);
546 		int ret;
547 
548 		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
549 		if (ret < 0) {
550 			dev_warn(&pdev->dev,
551 				"cannot read current mode for %d\n", i);
552 			val = MAX77802_OPMODE_NORMAL;
553 		} else {
554 			val = val >> shift & MAX77802_OPMODE_MASK;
555 		}
556 
557 		/*
558 		 * If the regulator is disabled and the system warm rebooted,
559 		 * the hardware reports OFF as the regulator operating mode.
560 		 * Default to operating mode NORMAL in that case.
561 		 */
562 		if (val == MAX77802_STATUS_OFF)
563 			max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
564 		else
565 			max77802->opmode[id] = val;
566 
567 		rdev = devm_regulator_register(&pdev->dev,
568 					       &regulators[i], &config);
569 		if (IS_ERR(rdev)) {
570 			ret = PTR_ERR(rdev);
571 			dev_err(&pdev->dev,
572 				"regulator init failed for %d: %d\n", i, ret);
573 			return ret;
574 		}
575 	}
576 
577 	return 0;
578 }
579 
580 static const struct platform_device_id max77802_pmic_id[] = {
581 	{"max77802-pmic", 0},
582 	{ },
583 };
584 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
585 
586 static struct platform_driver max77802_pmic_driver = {
587 	.driver = {
588 		.name = "max77802-pmic",
589 	},
590 	.probe = max77802_pmic_probe,
591 	.id_table = max77802_pmic_id,
592 };
593 
594 module_platform_driver(max77802_pmic_driver);
595 
596 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
597 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
598 MODULE_LICENSE("GPL");
599