1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // Copyright 2014 Embest Technology Co. Ltd. Inc.
4 // bd71815-regulator.c ROHM BD71815 regulator driver
5 //
6 // Author: Tony Luo <luofc@embedinfo.com>
7 //
8 // Partially rewritten at 2021 by
9 // Matti Vaittinen <matti.vaitinen@fi.rohmeurope.com>
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/platform_device.h>
16 #include <linux/of.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/regulator/driver.h>
19 #include <linux/delay.h>
20 #include <linux/slab.h>
21 #include <linux/gpio.h>
22 #include <linux/mfd/rohm-generic.h>
23 #include <linux/mfd/rohm-bd71815.h>
24 #include <linux/regulator/of_regulator.h>
25 
26 struct bd71815_regulator {
27 	struct regulator_desc desc;
28 	const struct rohm_dvs_config *dvs;
29 };
30 
31 static const int bd7181x_wled_currents[] = {
32 	10, 20, 30, 50, 70, 100, 200, 300, 500, 700, 1000, 2000, 3000, 4000,
33 	5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000,
34 	16000, 17000, 18000, 19000, 20000, 21000, 22000, 23000, 24000, 25000,
35 };
36 
37 static const struct rohm_dvs_config buck1_dvs = {
38 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
39 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
40 	.run_reg		= BD71815_REG_BUCK1_VOLT_H,
41 	.run_mask		= BD71815_VOLT_MASK,
42 	.run_on_mask		= BD71815_BUCK_RUN_ON,
43 	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
44 	.suspend_reg		= BD71815_REG_BUCK1_VOLT_L,
45 	.suspend_mask		= BD71815_VOLT_MASK,
46 	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
47 	.lpsr_reg		= BD71815_REG_BUCK1_VOLT_L,
48 	.lpsr_mask		= BD71815_VOLT_MASK,
49 	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
50 };
51 
52 static const struct rohm_dvs_config buck2_dvs = {
53 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
54 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
55 	.run_reg		= BD71815_REG_BUCK2_VOLT_H,
56 	.run_mask		= BD71815_VOLT_MASK,
57 	.run_on_mask		= BD71815_BUCK_RUN_ON,
58 	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
59 	.suspend_reg		= BD71815_REG_BUCK2_VOLT_L,
60 	.suspend_mask		= BD71815_VOLT_MASK,
61 	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
62 	.lpsr_reg		= BD71815_REG_BUCK2_VOLT_L,
63 	.lpsr_mask		= BD71815_VOLT_MASK,
64 	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
65 };
66 
67 static const struct rohm_dvs_config buck3_dvs = {
68 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
69 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
70 	.run_reg		= BD71815_REG_BUCK3_VOLT,
71 	.run_mask		= BD71815_VOLT_MASK,
72 	.run_on_mask		= BD71815_BUCK_RUN_ON,
73 	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
74 	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
75 	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
76 };
77 
78 static const struct rohm_dvs_config buck4_dvs = {
79 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
80 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
81 	.run_reg		= BD71815_REG_BUCK4_VOLT,
82 	.run_mask		= BD71815_VOLT_MASK,
83 	.run_on_mask		= BD71815_BUCK_RUN_ON,
84 	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
85 	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
86 	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
87 };
88 
89 static const struct rohm_dvs_config ldo1_dvs = {
90 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
91 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
92 	.run_reg		= BD71815_REG_LDO_MODE1,
93 	.run_mask		= BD71815_VOLT_MASK,
94 	.run_on_mask		= LDO1_RUN_ON,
95 	.snvs_on_mask		= LDO1_SNVS_ON,
96 	.suspend_on_mask	= LDO1_SUSP_ON,
97 	.lpsr_on_mask		= LDO1_LPSR_ON,
98 };
99 
100 static const struct rohm_dvs_config ldo2_dvs = {
101 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
102 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
103 	.run_reg		= BD71815_REG_LDO_MODE2,
104 	.run_mask		= BD71815_VOLT_MASK,
105 	.run_on_mask		= LDO2_RUN_ON,
106 	.snvs_on_mask		= LDO2_SNVS_ON,
107 	.suspend_on_mask	= LDO2_SUSP_ON,
108 	.lpsr_on_mask		= LDO2_LPSR_ON,
109 };
110 
111 static const struct rohm_dvs_config ldo3_dvs = {
112 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
113 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
114 	.run_reg		= BD71815_REG_LDO_MODE2,
115 	.run_mask		= BD71815_VOLT_MASK,
116 	.run_on_mask		= LDO3_RUN_ON,
117 	.snvs_on_mask		= LDO3_SNVS_ON,
118 	.suspend_on_mask	= LDO3_SUSP_ON,
119 	.lpsr_on_mask		= LDO3_LPSR_ON,
120 };
121 
122 static const struct rohm_dvs_config ldo4_dvs = {
123 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
124 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
125 	.run_reg		= BD71815_REG_LDO_MODE3,
126 	.run_mask		= BD71815_VOLT_MASK,
127 	.run_on_mask		= LDO4_RUN_ON,
128 	.snvs_on_mask		= LDO4_SNVS_ON,
129 	.suspend_on_mask	= LDO4_SUSP_ON,
130 	.lpsr_on_mask		= LDO4_LPSR_ON,
131 };
132 
133 static const struct rohm_dvs_config ldo5_dvs = {
134 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
135 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
136 	.run_reg		= BD71815_REG_LDO_MODE3,
137 	.run_mask		= BD71815_VOLT_MASK,
138 	.run_on_mask		= LDO5_RUN_ON,
139 	.snvs_on_mask		= LDO5_SNVS_ON,
140 	.suspend_on_mask	= LDO5_SUSP_ON,
141 	.lpsr_on_mask		= LDO5_LPSR_ON,
142 };
143 
144 static const struct rohm_dvs_config dvref_dvs = {
145 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
146 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
147 	.run_on_mask		= DVREF_RUN_ON,
148 	.snvs_on_mask		= DVREF_SNVS_ON,
149 	.suspend_on_mask	= DVREF_SUSP_ON,
150 	.lpsr_on_mask		= DVREF_LPSR_ON,
151 };
152 
153 static const struct rohm_dvs_config ldolpsr_dvs = {
154 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
155 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
156 	.run_on_mask		= DVREF_RUN_ON,
157 	.snvs_on_mask		= DVREF_SNVS_ON,
158 	.suspend_on_mask	= DVREF_SUSP_ON,
159 	.lpsr_on_mask		= DVREF_LPSR_ON,
160 };
161 
162 static const struct rohm_dvs_config buck5_dvs = {
163 	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
164 				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
165 	.run_reg		= BD71815_REG_BUCK5_VOLT,
166 	.run_mask		= BD71815_VOLT_MASK,
167 	.run_on_mask		= BD71815_BUCK_RUN_ON,
168 	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
169 	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
170 	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
171 };
172 
173 static int set_hw_dvs_levels(struct device_node *np,
174 			     const struct regulator_desc *desc,
175 			     struct regulator_config *cfg)
176 {
177 	struct bd71815_regulator *data;
178 
179 	data = container_of(desc, struct bd71815_regulator, desc);
180 	return rohm_regulator_set_dvs_levels(data->dvs, np, desc, cfg->regmap);
181 }
182 
183 /*
184  * Bucks 1 and 2 have two voltage selection registers where selected
185  * voltage can be set. Which of the registers is used can be either controlled
186  * by a control bit in register - or by HW state. If HW state specific voltages
187  * are given - then we assume HW state based control should be used.
188  *
189  * If volatge value is updated to currently selected register - then output
190  * voltage is immediately changed no matter what is set as ramp rate. Thus we
191  * default changing voltage by writing new value to inactive register and
192  * then updating the 'register selection' bit. This naturally only works when
193  * HW state machine is not used to select the voltage.
194  */
195 static int buck12_set_hw_dvs_levels(struct device_node *np,
196 				    const struct regulator_desc *desc,
197 				    struct regulator_config *cfg)
198 {
199 	struct bd71815_regulator *data;
200 	int ret = 0, val;
201 
202 	data = container_of(desc, struct bd71815_regulator, desc);
203 
204 	if (of_find_property(np, "rohm,dvs-run-voltage", NULL) ||
205 	    of_find_property(np, "rohm,dvs-suspend-voltage", NULL) ||
206 	    of_find_property(np, "rohm,dvs-lpsr-voltage", NULL) ||
207 	    of_find_property(np, "rohm,dvs-snvs-voltage", NULL)) {
208 		ret = regmap_read(cfg->regmap, desc->vsel_reg, &val);
209 		if (ret)
210 			return ret;
211 
212 		if (!(BD71815_BUCK_STBY_DVS & val) &&
213 		    !(BD71815_BUCK_DVSSEL & val)) {
214 			int val2;
215 
216 			/*
217 			 * We are currently using voltage from _L.
218 			 * We'd better copy it to _H and switch to it to
219 			 * avoid shutting us down if LPSR or SUSPEND is set to
220 			 * disabled. _L value is at reg _H + 1
221 			 */
222 			ret = regmap_read(cfg->regmap, desc->vsel_reg + 1,
223 					  &val2);
224 			if (ret)
225 				return ret;
226 
227 			ret = regmap_update_bits(cfg->regmap, desc->vsel_reg,
228 						 BD71815_VOLT_MASK |
229 						 BD71815_BUCK_DVSSEL,
230 						 val2 | BD71815_BUCK_DVSSEL);
231 			if (ret)
232 				return ret;
233 		}
234 		ret = rohm_regulator_set_dvs_levels(data->dvs, np, desc,
235 						    cfg->regmap);
236 		if (ret)
237 			return ret;
238 		/*
239 		 * DVS levels were given => use HW-state machine for voltage
240 		 * controls. NOTE: AFAIK, This means that if voltage is changed
241 		 * by SW the ramp-rate is not respected. Should we disable
242 		 * SW voltage control when the HW state machine is used?
243 		 */
244 		ret = regmap_update_bits(cfg->regmap, desc->vsel_reg,
245 					 BD71815_BUCK_STBY_DVS,
246 					 BD71815_BUCK_STBY_DVS);
247 	}
248 
249 	return ret;
250 }
251 
252 /*
253  * BUCK1/2
254  * BUCK1RAMPRATE[1:0] BUCK1 DVS ramp rate setting
255  * 00: 10.00mV/usec	10mV 1uS
256  * 01: 5.00mV/usec	10mV 2uS
257  * 10: 2.50mV/usec	10mV 4uS
258  * 11: 1.25mV/usec	10mV 8uS
259  */
260 static const unsigned int bd7181x_ramp_table[] = { 1250, 2500, 5000, 10000 };
261 
262 static int bd7181x_led_set_current_limit(struct regulator_dev *rdev,
263 					int min_uA, int max_uA)
264 {
265 	int ret;
266 	int onstatus;
267 
268 	onstatus = regulator_is_enabled_regmap(rdev);
269 
270 	ret = regulator_set_current_limit_regmap(rdev, min_uA, max_uA);
271 	if (!ret) {
272 		int newstatus;
273 
274 		newstatus = regulator_is_enabled_regmap(rdev);
275 		if (onstatus != newstatus) {
276 			/*
277 			 * HW FIX: spurious led status change detected. Toggle
278 			 * state as a workaround
279 			 */
280 			if (onstatus)
281 				ret = regulator_enable_regmap(rdev);
282 			else
283 				ret = regulator_disable_regmap(rdev);
284 
285 			if (ret)
286 				dev_err(rdev_get_dev(rdev),
287 					"failed to revert the LED state (%d)\n",
288 					ret);
289 		}
290 	}
291 
292 	return ret;
293 }
294 
295 static int bd7181x_buck12_get_voltage_sel(struct regulator_dev *rdev)
296 {
297 	int rid = rdev_get_id(rdev);
298 	int ret, regh, regl, val;
299 
300 	regh = BD71815_REG_BUCK1_VOLT_H + rid * 0x2;
301 	regl = BD71815_REG_BUCK1_VOLT_L + rid * 0x2;
302 
303 	ret = regmap_read(rdev->regmap, regh, &val);
304 	if (ret)
305 		return ret;
306 
307 	/*
308 	 * If we use HW state machine based voltage reg selection - then we
309 	 * return BD71815_REG_BUCK1_VOLT_H which is used at RUN.
310 	 * Else we do return the BD71815_REG_BUCK1_VOLT_H or
311 	 * BD71815_REG_BUCK1_VOLT_L depending on which is selected to be used
312 	 * by BD71815_BUCK_DVSSEL bit
313 	 */
314 	if ((!(val & BD71815_BUCK_STBY_DVS)) && (!(val & BD71815_BUCK_DVSSEL)))
315 		ret = regmap_read(rdev->regmap, regl, &val);
316 
317 	if (ret)
318 		return ret;
319 
320 	return val & BD71815_VOLT_MASK;
321 }
322 
323 /*
324  * For Buck 1/2.
325  */
326 static int bd7181x_buck12_set_voltage_sel(struct regulator_dev *rdev,
327 					  unsigned int sel)
328 {
329 	int rid = rdev_get_id(rdev);
330 	int ret, val, reg, regh, regl;
331 
332 	regh = BD71815_REG_BUCK1_VOLT_H + rid*0x2;
333 	regl = BD71815_REG_BUCK1_VOLT_L + rid*0x2;
334 
335 	ret = regmap_read(rdev->regmap, regh, &val);
336 	if (ret)
337 		return ret;
338 
339 	/*
340 	 * If bucks 1 & 2 are controlled by state machine - then the RUN state
341 	 * voltage is set to BD71815_REG_BUCK1_VOLT_H. Changing SUSPEND/LPSR
342 	 * voltages at runtime is not supported by this driver.
343 	 */
344 	if (((val & BD71815_BUCK_STBY_DVS))) {
345 		return regmap_update_bits(rdev->regmap, regh, BD71815_VOLT_MASK,
346 					  sel);
347 	}
348 	/* Update new voltage to the register which is not selected now */
349 	if (val & BD71815_BUCK_DVSSEL)
350 		reg = regl;
351 	else
352 		reg = regh;
353 
354 	ret = regmap_update_bits(rdev->regmap, reg, BD71815_VOLT_MASK, sel);
355 	if (ret)
356 		return ret;
357 
358 	/* Select the other DVS register to be used */
359 	return regmap_update_bits(rdev->regmap, regh, BD71815_BUCK_DVSSEL,
360 				  ~val);
361 }
362 
363 static const struct regulator_ops bd7181x_ldo_regulator_ops = {
364 	.enable = regulator_enable_regmap,
365 	.disable = regulator_disable_regmap,
366 	.is_enabled = regulator_is_enabled_regmap,
367 	.list_voltage = regulator_list_voltage_linear,
368 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
369 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
370 };
371 
372 static const struct regulator_ops bd7181x_fixed_regulator_ops = {
373 	.enable = regulator_enable_regmap,
374 	.disable = regulator_disable_regmap,
375 	.is_enabled = regulator_is_enabled_regmap,
376 	.list_voltage = regulator_list_voltage_linear,
377 };
378 
379 static const struct regulator_ops bd7181x_buck_regulator_ops = {
380 	.enable = regulator_enable_regmap,
381 	.disable = regulator_disable_regmap,
382 	.is_enabled = regulator_is_enabled_regmap,
383 	.list_voltage = regulator_list_voltage_linear,
384 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
385 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
386 	.set_voltage_time_sel = regulator_set_voltage_time_sel,
387 };
388 
389 static const struct regulator_ops bd7181x_buck12_regulator_ops = {
390 	.enable = regulator_enable_regmap,
391 	.disable = regulator_disable_regmap,
392 	.is_enabled = regulator_is_enabled_regmap,
393 	.list_voltage = regulator_list_voltage_linear,
394 	.set_voltage_sel = bd7181x_buck12_set_voltage_sel,
395 	.get_voltage_sel = bd7181x_buck12_get_voltage_sel,
396 	.set_voltage_time_sel = regulator_set_voltage_time_sel,
397 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
398 };
399 
400 static const struct regulator_ops bd7181x_led_regulator_ops = {
401 	.enable = regulator_enable_regmap,
402 	.disable = regulator_disable_regmap,
403 	.is_enabled = regulator_is_enabled_regmap,
404 	.set_current_limit = bd7181x_led_set_current_limit,
405 	.get_current_limit = regulator_get_current_limit_regmap,
406 };
407 
408 #define BD71815_FIXED_REG(_name, _id, ereg, emsk, voltage, _dvs)	\
409 	[(_id)] = {							\
410 		.desc = {						\
411 			.name = #_name,					\
412 			.of_match = of_match_ptr(#_name),		\
413 			.regulators_node = of_match_ptr("regulators"),	\
414 			.n_voltages = 1,				\
415 			.ops = &bd7181x_fixed_regulator_ops,		\
416 			.type = REGULATOR_VOLTAGE,			\
417 			.id = (_id),					\
418 			.owner = THIS_MODULE,				\
419 			.min_uV = (voltage),				\
420 			.enable_reg = (ereg),				\
421 			.enable_mask = (emsk),				\
422 			.of_parse_cb = set_hw_dvs_levels,		\
423 		},							\
424 		.dvs = (_dvs),						\
425 	}
426 
427 #define BD71815_BUCK_REG(_name, _id, vsel, ereg, min, max, step, _dvs)	\
428 	[(_id)] = {							\
429 		.desc = {						\
430 			.name = #_name,					\
431 			.of_match = of_match_ptr(#_name),		\
432 			.regulators_node = of_match_ptr("regulators"),	\
433 			.n_voltages = ((max) - (min)) / (step) + 1,	\
434 			.ops = &bd7181x_buck_regulator_ops,		\
435 			.type = REGULATOR_VOLTAGE,			\
436 			.id = (_id),					\
437 			.owner = THIS_MODULE,				\
438 			.min_uV = (min),				\
439 			.uV_step = (step),				\
440 			.vsel_reg = (vsel),				\
441 			.vsel_mask = BD71815_VOLT_MASK,			\
442 			.enable_reg = (ereg),				\
443 			.enable_mask = BD71815_BUCK_RUN_ON,		\
444 			.of_parse_cb = set_hw_dvs_levels,		\
445 		},							\
446 		.dvs = (_dvs),						\
447 	}
448 
449 #define BD71815_BUCK12_REG(_name, _id, vsel, ereg, min, max, step,	\
450 			   _dvs)					\
451 	[(_id)] = {							\
452 		.desc = {						\
453 			.name = #_name,					\
454 			.of_match = of_match_ptr(#_name),		\
455 			.regulators_node = of_match_ptr("regulators"),	\
456 			.n_voltages = ((max) - (min)) / (step) + 1,	\
457 			.ops = &bd7181x_buck12_regulator_ops,		\
458 			.type = REGULATOR_VOLTAGE,			\
459 			.id = (_id),					\
460 			.owner = THIS_MODULE,				\
461 			.min_uV = (min),				\
462 			.uV_step = (step),				\
463 			.vsel_reg = (vsel),				\
464 			.vsel_mask = 0x3f,				\
465 			.enable_reg = (ereg),				\
466 			.enable_mask = 0x04,				\
467 			.ramp_reg = (ereg),				\
468 			.ramp_mask = BD71815_BUCK_RAMPRATE_MASK,	\
469 			.ramp_delay_table = bd7181x_ramp_table,		\
470 			.n_ramp_values = ARRAY_SIZE(bd7181x_ramp_table),\
471 			.of_parse_cb = buck12_set_hw_dvs_levels,	\
472 		},							\
473 		.dvs = (_dvs),						\
474 	}
475 
476 #define BD71815_LED_REG(_name, _id, csel, mask, ereg, emsk, currents)	\
477 	[(_id)] = {							\
478 		.desc = {						\
479 			.name = #_name,					\
480 			.of_match = of_match_ptr(#_name),		\
481 			.regulators_node = of_match_ptr("regulators"),	\
482 			.n_current_limits = ARRAY_SIZE(currents),	\
483 			.ops = &bd7181x_led_regulator_ops,		\
484 			.type = REGULATOR_CURRENT,			\
485 			.id = (_id),					\
486 			.owner = THIS_MODULE,				\
487 			.curr_table = currents,				\
488 			.csel_reg = (csel),				\
489 			.csel_mask = (mask),				\
490 			.enable_reg = (ereg),				\
491 			.enable_mask = (emsk),				\
492 		},							\
493 	}
494 
495 #define BD71815_LDO_REG(_name, _id, vsel, ereg, emsk, min, max, step,	\
496 			_dvs)						\
497 	[(_id)] = {							\
498 		.desc = {						\
499 			.name = #_name,					\
500 			.of_match = of_match_ptr(#_name),		\
501 			.regulators_node = of_match_ptr("regulators"),	\
502 			.n_voltages = ((max) - (min)) / (step) + 1,	\
503 			.ops = &bd7181x_ldo_regulator_ops,		\
504 			.type = REGULATOR_VOLTAGE,			\
505 			.id = (_id),					\
506 			.owner = THIS_MODULE,				\
507 			.min_uV = (min),				\
508 			.uV_step = (step),				\
509 			.vsel_reg = (vsel),				\
510 			.vsel_mask = BD71815_VOLT_MASK,			\
511 			.enable_reg = (ereg),				\
512 			.enable_mask = (emsk),				\
513 			.of_parse_cb = set_hw_dvs_levels,		\
514 		},							\
515 		.dvs = (_dvs),						\
516 	}
517 
518 static const struct bd71815_regulator bd71815_regulators[] = {
519 	BD71815_BUCK12_REG(buck1, BD71815_BUCK1, BD71815_REG_BUCK1_VOLT_H,
520 			   BD71815_REG_BUCK1_MODE, 800000, 2000000, 25000,
521 			   &buck1_dvs),
522 	BD71815_BUCK12_REG(buck2, BD71815_BUCK2, BD71815_REG_BUCK2_VOLT_H,
523 			   BD71815_REG_BUCK2_MODE, 800000, 2000000, 25000,
524 			   &buck2_dvs),
525 	BD71815_BUCK_REG(buck3, BD71815_BUCK3, BD71815_REG_BUCK3_VOLT,
526 			 BD71815_REG_BUCK3_MODE,  1200000, 2700000, 50000,
527 			 &buck3_dvs),
528 	BD71815_BUCK_REG(buck4, BD71815_BUCK4, BD71815_REG_BUCK4_VOLT,
529 			 BD71815_REG_BUCK4_MODE,  1100000, 1850000, 25000,
530 			 &buck4_dvs),
531 	BD71815_BUCK_REG(buck5, BD71815_BUCK5, BD71815_REG_BUCK5_VOLT,
532 			 BD71815_REG_BUCK5_MODE,  1800000, 3300000, 50000,
533 			 &buck5_dvs),
534 	BD71815_LDO_REG(ldo1, BD71815_LDO1, BD71815_REG_LDO1_VOLT,
535 			BD71815_REG_LDO_MODE1, LDO1_RUN_ON, 800000, 3300000,
536 			50000, &ldo1_dvs),
537 	BD71815_LDO_REG(ldo2, BD71815_LDO2, BD71815_REG_LDO2_VOLT,
538 			BD71815_REG_LDO_MODE2, LDO2_RUN_ON, 800000, 3300000,
539 			50000, &ldo2_dvs),
540 	/*
541 	 * Let's default LDO3 to be enabled by SW. We can override ops if DT
542 	 * says LDO3 should be enabled by HW when DCIN is connected.
543 	 */
544 	BD71815_LDO_REG(ldo3, BD71815_LDO3, BD71815_REG_LDO3_VOLT,
545 			BD71815_REG_LDO_MODE2, LDO3_RUN_ON, 800000, 3300000,
546 			50000, &ldo3_dvs),
547 	BD71815_LDO_REG(ldo4, BD71815_LDO4, BD71815_REG_LDO4_VOLT,
548 			BD71815_REG_LDO_MODE3, LDO4_RUN_ON, 800000, 3300000,
549 			50000, &ldo4_dvs),
550 	BD71815_LDO_REG(ldo5, BD71815_LDO5, BD71815_REG_LDO5_VOLT_H,
551 			BD71815_REG_LDO_MODE3, LDO5_RUN_ON, 800000, 3300000,
552 			50000, &ldo5_dvs),
553 	BD71815_FIXED_REG(ldodvref, BD71815_LDODVREF, BD71815_REG_LDO_MODE4,
554 			  DVREF_RUN_ON, 3000000, &dvref_dvs),
555 	BD71815_FIXED_REG(ldolpsr, BD71815_LDOLPSR, BD71815_REG_LDO_MODE4,
556 			  LDO_LPSR_RUN_ON, 1800000, &ldolpsr_dvs),
557 	BD71815_LED_REG(wled, BD71815_WLED, BD71815_REG_LED_DIMM, LED_DIMM_MASK,
558 			BD71815_REG_LED_CTRL, LED_RUN_ON,
559 			bd7181x_wled_currents),
560 };
561 
562 static int bd7181x_probe(struct platform_device *pdev)
563 {
564 	struct regulator_config config = {};
565 	int i, ret;
566 	struct gpio_desc *ldo4_en;
567 	struct regmap *regmap;
568 
569 	regmap = dev_get_regmap(pdev->dev.parent, NULL);
570 	if (!regmap) {
571 		dev_err(&pdev->dev, "No parent regmap\n");
572 		return -ENODEV;
573 	}
574 	ldo4_en = devm_gpiod_get_from_of_node(&pdev->dev,
575 					      pdev->dev.parent->of_node,
576 						 "rohm,vsel-gpios", 0,
577 						 GPIOD_ASIS, "ldo4-en");
578 
579 	if (IS_ERR(ldo4_en)) {
580 		ret = PTR_ERR(ldo4_en);
581 		if (ret != -ENOENT)
582 			return ret;
583 		ldo4_en = NULL;
584 	}
585 
586 	/* Disable to go to ship-mode */
587 	ret = regmap_update_bits(regmap, BD71815_REG_PWRCTRL, RESTARTEN, 0);
588 	if (ret)
589 		return ret;
590 
591 	config.dev = pdev->dev.parent;
592 	config.regmap = regmap;
593 
594 	for (i = 0; i < BD71815_REGULATOR_CNT; i++) {
595 		const struct regulator_desc *desc;
596 		struct regulator_dev *rdev;
597 
598 		desc = &bd71815_regulators[i].desc;
599 
600 		if (i == BD71815_LDO4)
601 			config.ena_gpiod = ldo4_en;
602 		else
603 			config.ena_gpiod = NULL;
604 
605 		rdev = devm_regulator_register(&pdev->dev, desc, &config);
606 		if (IS_ERR(rdev)) {
607 			dev_err(&pdev->dev,
608 				"failed to register %s regulator\n",
609 				desc->name);
610 			return PTR_ERR(rdev);
611 		}
612 	}
613 	return 0;
614 }
615 
616 static const struct platform_device_id bd7181x_pmic_id[] = {
617 	{ "bd71815-pmic", ROHM_CHIP_TYPE_BD71815 },
618 	{ },
619 };
620 MODULE_DEVICE_TABLE(platform, bd7181x_pmic_id);
621 
622 static struct platform_driver bd7181x_regulator = {
623 	.driver = {
624 		.name = "bd7181x-pmic",
625 	},
626 	.probe = bd7181x_probe,
627 	.id_table = bd7181x_pmic_id,
628 };
629 module_platform_driver(bd7181x_regulator);
630 
631 MODULE_AUTHOR("Tony Luo <luofc@embedinfo.com>");
632 MODULE_DESCRIPTION("BD71815 voltage regulator driver");
633 MODULE_LICENSE("GPL v2");
634 MODULE_ALIAS("platform:bd7181x-pmic");
635