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