1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2020 ROHM Semiconductors
3 // ROHM BD9576MUF/BD9573MUF regulator driver
4 
5 #include <linux/err.h>
6 #include <linux/gpio/consumer.h>
7 #include <linux/interrupt.h>
8 #include <linux/jiffies.h>
9 #include <linux/kernel.h>
10 #include <linux/mfd/rohm-bd957x.h>
11 #include <linux/mfd/rohm-generic.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/property.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/regulator/of_regulator.h>
19 #include <linux/slab.h>
20 #include <linux/spinlock.h>
21 #include <linux/workqueue.h>
22 
23 #define BD957X_VOUTS1_VOLT	3300000
24 #define BD957X_VOUTS4_BASE_VOLT	1030000
25 #define BD957X_VOUTS34_NUM_VOLT	32
26 
27 #define BD9576_THERM_IRQ_MASK_TW	BIT(5)
28 #define BD9576_xVD_IRQ_MASK_VOUTL1	BIT(5)
29 #define BD9576_UVD_IRQ_MASK_VOUTS1_OCW	BIT(6)
30 #define BD9576_xVD_IRQ_MASK_VOUT1TO4	0x0F
31 
32 static const unsigned int vout1_volt_table[] = {
33 	5000000, 4900000, 4800000, 4700000, 4600000,
34 	4500000, 4500000, 4500000, 5000000, 5100000,
35 	5200000, 5300000, 5400000, 5500000, 5500000,
36 	5500000
37 };
38 
39 static const unsigned int vout2_volt_table[] = {
40 	1800000, 1780000, 1760000, 1740000, 1720000,
41 	1700000, 1680000, 1660000, 1800000, 1820000,
42 	1840000, 1860000, 1880000, 1900000, 1920000,
43 	1940000
44 };
45 
46 static const unsigned int voutl1_volt_table[] = {
47 	2500000, 2540000, 2580000, 2620000, 2660000,
48 	2700000, 2740000, 2780000, 2500000, 2460000,
49 	2420000, 2380000, 2340000, 2300000, 2260000,
50 	2220000
51 };
52 
53 static const struct linear_range vout1_xvd_ranges[] = {
54 	REGULATOR_LINEAR_RANGE(225000, 0x01, 0x2b, 0),
55 	REGULATOR_LINEAR_RANGE(225000, 0x2c, 0x54, 5000),
56 	REGULATOR_LINEAR_RANGE(425000, 0x55, 0x7f, 0),
57 };
58 
59 static const struct linear_range vout234_xvd_ranges[] = {
60 	REGULATOR_LINEAR_RANGE(17000, 0x01, 0x0f, 0),
61 	REGULATOR_LINEAR_RANGE(17000, 0x10, 0x6d, 1000),
62 	REGULATOR_LINEAR_RANGE(110000, 0x6e, 0x7f, 0),
63 };
64 
65 static const struct linear_range voutL1_xvd_ranges[] = {
66 	REGULATOR_LINEAR_RANGE(34000, 0x01, 0x0f, 0),
67 	REGULATOR_LINEAR_RANGE(34000, 0x10, 0x6d, 2000),
68 	REGULATOR_LINEAR_RANGE(220000, 0x6e, 0x7f, 0),
69 };
70 
71 static struct linear_range voutS1_ocw_ranges_internal[] = {
72 	REGULATOR_LINEAR_RANGE(200000, 0x01, 0x04, 0),
73 	REGULATOR_LINEAR_RANGE(250000, 0x05, 0x18, 50000),
74 	REGULATOR_LINEAR_RANGE(1200000, 0x19, 0x3f, 0),
75 };
76 
77 static struct linear_range voutS1_ocw_ranges[] = {
78 	REGULATOR_LINEAR_RANGE(50000, 0x01, 0x04, 0),
79 	REGULATOR_LINEAR_RANGE(60000, 0x05, 0x18, 10000),
80 	REGULATOR_LINEAR_RANGE(250000, 0x19, 0x3f, 0),
81 };
82 
83 static struct linear_range voutS1_ocp_ranges_internal[] = {
84 	REGULATOR_LINEAR_RANGE(300000, 0x01, 0x06, 0),
85 	REGULATOR_LINEAR_RANGE(350000, 0x7, 0x1b, 50000),
86 	REGULATOR_LINEAR_RANGE(1350000, 0x1c, 0x3f, 0),
87 };
88 
89 static struct linear_range voutS1_ocp_ranges[] = {
90 	REGULATOR_LINEAR_RANGE(70000, 0x01, 0x06, 0),
91 	REGULATOR_LINEAR_RANGE(80000, 0x7, 0x1b, 10000),
92 	REGULATOR_LINEAR_RANGE(280000, 0x1c, 0x3f, 0),
93 };
94 
95 struct bd957x_regulator_data {
96 	struct regulator_desc desc;
97 	int base_voltage;
98 	struct regulator_dev *rdev;
99 	int ovd_notif;
100 	int uvd_notif;
101 	int temp_notif;
102 	int ovd_err;
103 	int uvd_err;
104 	int temp_err;
105 	const struct linear_range *xvd_ranges;
106 	int num_xvd_ranges;
107 	bool oc_supported;
108 	unsigned int ovd_reg;
109 	unsigned int uvd_reg;
110 	unsigned int xvd_mask;
111 	unsigned int ocp_reg;
112 	unsigned int ocp_mask;
113 	unsigned int ocw_reg;
114 	unsigned int ocw_mask;
115 	unsigned int ocw_rfet;
116 };
117 
118 #define BD9576_NUM_REGULATORS 6
119 #define BD9576_NUM_OVD_REGULATORS 5
120 
121 struct bd957x_data {
122 	struct bd957x_regulator_data regulator_data[BD9576_NUM_REGULATORS];
123 	struct regmap *regmap;
124 	struct delayed_work therm_irq_suppress;
125 	struct delayed_work ovd_irq_suppress;
126 	struct delayed_work uvd_irq_suppress;
127 	unsigned int therm_irq;
128 	unsigned int ovd_irq;
129 	unsigned int uvd_irq;
130 	spinlock_t err_lock;
131 	int regulator_global_err;
132 };
133 
134 static int bd957x_vout34_list_voltage(struct regulator_dev *rdev,
135 				      unsigned int selector)
136 {
137 	const struct regulator_desc *desc = rdev->desc;
138 	int multiplier = selector & desc->vsel_mask & 0x7f;
139 	int tune;
140 
141 	/* VOUT3 and 4 has 10mV step */
142 	tune = multiplier * 10000;
143 
144 	if (!(selector & 0x80))
145 		return desc->fixed_uV - tune;
146 
147 	return desc->fixed_uV + tune;
148 }
149 
150 static int bd957x_list_voltage(struct regulator_dev *rdev,
151 			       unsigned int selector)
152 {
153 	const struct regulator_desc *desc = rdev->desc;
154 	int index = selector & desc->vsel_mask & 0x7f;
155 
156 	if (!(selector & 0x80))
157 		index += desc->n_voltages/2;
158 
159 	if (index >= desc->n_voltages)
160 		return -EINVAL;
161 
162 	return desc->volt_table[index];
163 }
164 
165 static void bd9576_fill_ovd_flags(struct bd957x_regulator_data *data,
166 				  bool warn)
167 {
168 	if (warn) {
169 		data->ovd_notif = REGULATOR_EVENT_OVER_VOLTAGE_WARN;
170 		data->ovd_err = REGULATOR_ERROR_OVER_VOLTAGE_WARN;
171 	} else {
172 		data->ovd_notif = REGULATOR_EVENT_REGULATION_OUT;
173 		data->ovd_err = REGULATOR_ERROR_REGULATION_OUT;
174 	}
175 }
176 
177 static void bd9576_fill_ocp_flags(struct bd957x_regulator_data *data,
178 				  bool warn)
179 {
180 	if (warn) {
181 		data->uvd_notif = REGULATOR_EVENT_OVER_CURRENT_WARN;
182 		data->uvd_err = REGULATOR_ERROR_OVER_CURRENT_WARN;
183 	} else {
184 		data->uvd_notif = REGULATOR_EVENT_OVER_CURRENT;
185 		data->uvd_err = REGULATOR_ERROR_OVER_CURRENT;
186 	}
187 }
188 
189 static void bd9576_fill_uvd_flags(struct bd957x_regulator_data *data,
190 				  bool warn)
191 {
192 	if (warn) {
193 		data->uvd_notif = REGULATOR_EVENT_UNDER_VOLTAGE_WARN;
194 		data->uvd_err = REGULATOR_ERROR_UNDER_VOLTAGE_WARN;
195 	} else {
196 		data->uvd_notif = REGULATOR_EVENT_UNDER_VOLTAGE;
197 		data->uvd_err = REGULATOR_ERROR_UNDER_VOLTAGE;
198 	}
199 }
200 
201 static void bd9576_fill_temp_flags(struct bd957x_regulator_data *data,
202 				   bool enable, bool warn)
203 {
204 	if (!enable) {
205 		data->temp_notif = 0;
206 		data->temp_err = 0;
207 	} else if (warn) {
208 		data->temp_notif = REGULATOR_EVENT_OVER_TEMP_WARN;
209 		data->temp_err = REGULATOR_ERROR_OVER_TEMP_WARN;
210 	} else {
211 		data->temp_notif = REGULATOR_EVENT_OVER_TEMP;
212 		data->temp_err = REGULATOR_ERROR_OVER_TEMP;
213 	}
214 }
215 
216 static int bd9576_set_limit(const struct linear_range *r, int num_ranges,
217 			    struct regmap *regmap, int reg, int mask, int lim)
218 {
219 	int ret;
220 	bool found;
221 	int sel = 0;
222 
223 	if (lim) {
224 
225 		ret = linear_range_get_selector_low_array(r, num_ranges,
226 							  lim, &sel, &found);
227 		if (ret)
228 			return ret;
229 
230 		if (!found)
231 			dev_warn(regmap_get_device(regmap),
232 				 "limit %d out of range. Setting lower\n",
233 				 lim);
234 	}
235 
236 	return regmap_update_bits(regmap, reg, mask, sel);
237 }
238 
239 static bool check_ocp_flag_mismatch(struct regulator_dev *rdev, int severity,
240 				    struct bd957x_regulator_data *r)
241 {
242 	if ((severity == REGULATOR_SEVERITY_ERR &&
243 	    r->uvd_notif != REGULATOR_EVENT_OVER_CURRENT) ||
244 	    (severity == REGULATOR_SEVERITY_WARN &&
245 	    r->uvd_notif != REGULATOR_EVENT_OVER_CURRENT_WARN)) {
246 		dev_warn(rdev_get_dev(rdev),
247 			 "Can't support both OCP WARN and ERR\n");
248 		/* Do not overwrite ERR config with WARN */
249 		if (severity == REGULATOR_SEVERITY_WARN)
250 			return true;
251 
252 		bd9576_fill_ocp_flags(r, 0);
253 	}
254 
255 	return false;
256 }
257 
258 static bool check_uvd_flag_mismatch(struct regulator_dev *rdev, int severity,
259 				    struct bd957x_regulator_data *r)
260 {
261 	if ((severity == REGULATOR_SEVERITY_ERR &&
262 	     r->uvd_notif != REGULATOR_EVENT_UNDER_VOLTAGE) ||
263 	     (severity == REGULATOR_SEVERITY_WARN &&
264 	     r->uvd_notif != REGULATOR_EVENT_UNDER_VOLTAGE_WARN)) {
265 		dev_warn(rdev_get_dev(rdev),
266 			 "Can't support both UVD WARN and ERR\n");
267 		if (severity == REGULATOR_SEVERITY_WARN)
268 			return true;
269 
270 		bd9576_fill_uvd_flags(r, 0);
271 	}
272 
273 	return false;
274 }
275 
276 static bool check_ovd_flag_mismatch(struct regulator_dev *rdev, int severity,
277 				    struct bd957x_regulator_data *r)
278 {
279 	if ((severity == REGULATOR_SEVERITY_ERR &&
280 	     r->ovd_notif != REGULATOR_EVENT_REGULATION_OUT) ||
281 	     (severity == REGULATOR_SEVERITY_WARN &&
282 	     r->ovd_notif != REGULATOR_EVENT_OVER_VOLTAGE_WARN)) {
283 		dev_warn(rdev_get_dev(rdev),
284 			 "Can't support both OVD WARN and ERR\n");
285 		if (severity == REGULATOR_SEVERITY_WARN)
286 			return true;
287 
288 		bd9576_fill_ovd_flags(r, 0);
289 	}
290 
291 	return false;
292 }
293 
294 static bool check_temp_flag_mismatch(struct regulator_dev *rdev, int severity,
295 				    struct bd957x_regulator_data *r)
296 {
297 	if ((severity == REGULATOR_SEVERITY_ERR &&
298 	     r->temp_notif != REGULATOR_EVENT_OVER_TEMP) ||
299 	     (severity == REGULATOR_SEVERITY_WARN &&
300 	     r->temp_notif != REGULATOR_EVENT_OVER_TEMP_WARN)) {
301 		dev_warn(rdev_get_dev(rdev),
302 			 "Can't support both thermal WARN and ERR\n");
303 		if (severity == REGULATOR_SEVERITY_WARN)
304 			return true;
305 	}
306 
307 	return false;
308 }
309 
310 static int bd9576_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity,
311 			  bool enable)
312 {
313 	struct bd957x_data *d;
314 	struct bd957x_regulator_data *r;
315 	int reg, mask;
316 	int Vfet, rfet;
317 	const struct linear_range *range;
318 	int num_ranges;
319 
320 	if ((lim_uA && !enable) || (!lim_uA && enable))
321 		return -EINVAL;
322 
323 	r = container_of(rdev->desc, struct bd957x_regulator_data, desc);
324 	if (!r->oc_supported)
325 		return -EINVAL;
326 
327 	d = rdev_get_drvdata(rdev);
328 
329 	if (severity == REGULATOR_SEVERITY_PROT) {
330 		reg = r->ocp_reg;
331 		mask = r->ocp_mask;
332 		if (r->ocw_rfet) {
333 			range = voutS1_ocp_ranges;
334 			num_ranges = ARRAY_SIZE(voutS1_ocp_ranges);
335 			rfet = r->ocw_rfet / 1000;
336 		} else {
337 			range = voutS1_ocp_ranges_internal;
338 			num_ranges = ARRAY_SIZE(voutS1_ocp_ranges_internal);
339 			/* Internal values are already micro-amperes */
340 			rfet = 1000;
341 		}
342 	} else {
343 		reg = r->ocw_reg;
344 		mask = r->ocw_mask;
345 
346 		if (r->ocw_rfet) {
347 			range = voutS1_ocw_ranges;
348 			num_ranges = ARRAY_SIZE(voutS1_ocw_ranges);
349 			rfet = r->ocw_rfet / 1000;
350 		} else {
351 			range = voutS1_ocw_ranges_internal;
352 			num_ranges = ARRAY_SIZE(voutS1_ocw_ranges_internal);
353 			/* Internal values are already micro-amperes */
354 			rfet = 1000;
355 		}
356 
357 		/* We abuse uvd fields for OCW on VoutS1 */
358 		if (r->uvd_notif) {
359 			/*
360 			 * If both warning and error are requested, prioritize
361 			 * ERROR configuration
362 			 */
363 			if (check_ocp_flag_mismatch(rdev, severity, r))
364 				return 0;
365 		} else {
366 			bool warn = severity == REGULATOR_SEVERITY_WARN;
367 
368 			bd9576_fill_ocp_flags(r, warn);
369 		}
370 	}
371 
372 	/*
373 	 * limits are given in uA, rfet is mOhm
374 	 * Divide lim_uA by 1000 to get Vfet in uV.
375 	 * (We expect both Rfet and limit uA to be magnitude of hundreds of
376 	 * milli Amperes & milli Ohms => we should still have decent accuracy)
377 	 */
378 	Vfet = lim_uA/1000 * rfet;
379 
380 	return bd9576_set_limit(range, num_ranges, d->regmap,
381 				reg, mask, Vfet);
382 }
383 
384 static int bd9576_set_uvp(struct regulator_dev *rdev, int lim_uV, int severity,
385 			  bool enable)
386 {
387 	struct bd957x_data *d;
388 	struct bd957x_regulator_data *r;
389 	int mask, reg;
390 
391 	if (severity == REGULATOR_SEVERITY_PROT) {
392 		if (!enable || lim_uV)
393 			return -EINVAL;
394 		return 0;
395 	}
396 
397 	/*
398 	 * BD9576 has enable control as a special value in limit reg. Can't
399 	 * set limit but keep feature disabled or enable W/O given limit.
400 	 */
401 	if ((lim_uV && !enable) || (!lim_uV && enable))
402 		return -EINVAL;
403 
404 	r = container_of(rdev->desc, struct bd957x_regulator_data, desc);
405 	d = rdev_get_drvdata(rdev);
406 
407 	mask = r->xvd_mask;
408 	reg = r->uvd_reg;
409 	/*
410 	 * Check that there is no mismatch for what the detection IRQs are to
411 	 * be used.
412 	 */
413 	if (r->uvd_notif) {
414 		if (check_uvd_flag_mismatch(rdev, severity, r))
415 			return 0;
416 	} else {
417 		bd9576_fill_uvd_flags(r, severity == REGULATOR_SEVERITY_WARN);
418 	}
419 
420 	return bd9576_set_limit(r->xvd_ranges, r->num_xvd_ranges, d->regmap,
421 				reg, mask, lim_uV);
422 }
423 
424 static int bd9576_set_ovp(struct regulator_dev *rdev, int lim_uV, int severity,
425 			  bool enable)
426 {
427 	struct bd957x_data *d;
428 	struct bd957x_regulator_data *r;
429 	int mask, reg;
430 
431 	if (severity == REGULATOR_SEVERITY_PROT) {
432 		if (!enable || lim_uV)
433 			return -EINVAL;
434 		return 0;
435 	}
436 
437 	/*
438 	 * BD9576 has enable control as a special value in limit reg. Can't
439 	 * set limit but keep feature disabled or enable W/O given limit.
440 	 */
441 	if ((lim_uV && !enable) || (!lim_uV && enable))
442 		return -EINVAL;
443 
444 	r = container_of(rdev->desc, struct bd957x_regulator_data, desc);
445 	d = rdev_get_drvdata(rdev);
446 
447 	mask = r->xvd_mask;
448 	reg = r->ovd_reg;
449 	/*
450 	 * Check that there is no mismatch for what the detection IRQs are to
451 	 * be used.
452 	 */
453 	if (r->ovd_notif) {
454 		if (check_ovd_flag_mismatch(rdev, severity, r))
455 			return 0;
456 	} else {
457 		bd9576_fill_ovd_flags(r, severity == REGULATOR_SEVERITY_WARN);
458 	}
459 
460 	return bd9576_set_limit(r->xvd_ranges, r->num_xvd_ranges, d->regmap,
461 				reg, mask, lim_uV);
462 }
463 
464 
465 static int bd9576_set_tw(struct regulator_dev *rdev, int lim, int severity,
466 			  bool enable)
467 {
468 	struct bd957x_data *d;
469 	struct bd957x_regulator_data *r;
470 	int i;
471 
472 	/*
473 	 * BD9576MUF has fixed temperature limits
474 	 * The detection can only be enabled/disabled
475 	 */
476 	if (lim)
477 		return -EINVAL;
478 
479 	/* Protection can't be disabled */
480 	if (severity == REGULATOR_SEVERITY_PROT) {
481 		if (!enable)
482 			return -EINVAL;
483 		else
484 			return 0;
485 	}
486 
487 	r = container_of(rdev->desc, struct bd957x_regulator_data, desc);
488 	d = rdev_get_drvdata(rdev);
489 
490 	/*
491 	 * Check that there is no mismatch for what the detection IRQs are to
492 	 * be used.
493 	 */
494 	if (r->temp_notif)
495 		if (check_temp_flag_mismatch(rdev, severity, r))
496 			return 0;
497 
498 	bd9576_fill_temp_flags(r, enable, severity == REGULATOR_SEVERITY_WARN);
499 
500 	if (enable)
501 		return regmap_update_bits(d->regmap, BD957X_REG_INT_THERM_MASK,
502 					 BD9576_THERM_IRQ_MASK_TW, 0);
503 
504 	/*
505 	 * If any of the regulators is interested in thermal warning we keep IRQ
506 	 * enabled.
507 	 */
508 	for (i = 0; i < BD9576_NUM_REGULATORS; i++)
509 		if (d->regulator_data[i].temp_notif)
510 			return 0;
511 
512 	return regmap_update_bits(d->regmap, BD957X_REG_INT_THERM_MASK,
513 				  BD9576_THERM_IRQ_MASK_TW,
514 				  BD9576_THERM_IRQ_MASK_TW);
515 }
516 
517 static const struct regulator_ops bd9573_vout34_ops = {
518 	.is_enabled = regulator_is_enabled_regmap,
519 	.list_voltage = bd957x_vout34_list_voltage,
520 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
521 };
522 
523 static const struct regulator_ops bd9576_vout34_ops = {
524 	.is_enabled = regulator_is_enabled_regmap,
525 	.list_voltage = bd957x_vout34_list_voltage,
526 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
527 	.set_over_voltage_protection = bd9576_set_ovp,
528 	.set_under_voltage_protection = bd9576_set_uvp,
529 	.set_thermal_protection = bd9576_set_tw,
530 };
531 
532 static const struct regulator_ops bd9573_vouts1_regulator_ops = {
533 	.is_enabled = regulator_is_enabled_regmap,
534 };
535 
536 static const struct regulator_ops bd9576_vouts1_regulator_ops = {
537 	.is_enabled = regulator_is_enabled_regmap,
538 	.set_over_current_protection = bd9576_set_ocp,
539 };
540 
541 static const struct regulator_ops bd9573_ops = {
542 	.is_enabled = regulator_is_enabled_regmap,
543 	.list_voltage = bd957x_list_voltage,
544 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
545 };
546 
547 static const struct regulator_ops bd9576_ops = {
548 	.is_enabled = regulator_is_enabled_regmap,
549 	.list_voltage = bd957x_list_voltage,
550 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
551 	.set_over_voltage_protection = bd9576_set_ovp,
552 	.set_under_voltage_protection = bd9576_set_uvp,
553 	.set_thermal_protection = bd9576_set_tw,
554 };
555 
556 static const struct regulator_ops  *bd9573_ops_arr[] = {
557 	[BD957X_VD50]	= &bd9573_ops,
558 	[BD957X_VD18]	= &bd9573_ops,
559 	[BD957X_VDDDR]	= &bd9573_vout34_ops,
560 	[BD957X_VD10]	= &bd9573_vout34_ops,
561 	[BD957X_VOUTL1]	= &bd9573_ops,
562 	[BD957X_VOUTS1]	= &bd9573_vouts1_regulator_ops,
563 };
564 
565 static const struct regulator_ops  *bd9576_ops_arr[] = {
566 	[BD957X_VD50]	= &bd9576_ops,
567 	[BD957X_VD18]	= &bd9576_ops,
568 	[BD957X_VDDDR]	= &bd9576_vout34_ops,
569 	[BD957X_VD10]	= &bd9576_vout34_ops,
570 	[BD957X_VOUTL1]	= &bd9576_ops,
571 	[BD957X_VOUTS1]	= &bd9576_vouts1_regulator_ops,
572 };
573 
574 static int vouts1_get_fet_res(struct device_node *np,
575 				const struct regulator_desc *desc,
576 				struct regulator_config *cfg)
577 {
578 	struct bd957x_regulator_data *data;
579 	int ret;
580 	u32 uohms;
581 
582 	data = container_of(desc, struct bd957x_regulator_data, desc);
583 
584 	ret = of_property_read_u32(np, "rohm,ocw-fet-ron-micro-ohms", &uohms);
585 	if (ret) {
586 		if (ret != -EINVAL)
587 			return ret;
588 
589 		return 0;
590 	}
591 	data->ocw_rfet = uohms;
592 	return 0;
593 }
594 
595 static struct bd957x_data bd957x_regulators = {
596 	.regulator_data = {
597 		{
598 			.desc = {
599 				.name = "VD50",
600 				.of_match = of_match_ptr("regulator-vd50"),
601 				.regulators_node = of_match_ptr("regulators"),
602 				.id = BD957X_VD50,
603 				.type = REGULATOR_VOLTAGE,
604 				.volt_table = &vout1_volt_table[0],
605 				.n_voltages = ARRAY_SIZE(vout1_volt_table),
606 				.vsel_reg = BD957X_REG_VOUT1_TUNE,
607 				.vsel_mask = BD957X_MASK_VOUT1_TUNE,
608 				.enable_reg = BD957X_REG_POW_TRIGGER1,
609 				.enable_mask = BD957X_REGULATOR_EN_MASK,
610 				.enable_val = BD957X_REGULATOR_DIS_VAL,
611 				.enable_is_inverted = true,
612 				.owner = THIS_MODULE,
613 			},
614 			.xvd_ranges = vout1_xvd_ranges,
615 			.num_xvd_ranges = ARRAY_SIZE(vout1_xvd_ranges),
616 			.ovd_reg = BD9576_REG_VOUT1_OVD,
617 			.uvd_reg = BD9576_REG_VOUT1_UVD,
618 			.xvd_mask = BD9576_MASK_XVD,
619 		},
620 		{
621 			.desc = {
622 				.name = "VD18",
623 				.of_match = of_match_ptr("regulator-vd18"),
624 				.regulators_node = of_match_ptr("regulators"),
625 				.id = BD957X_VD18,
626 				.type = REGULATOR_VOLTAGE,
627 				.volt_table = &vout2_volt_table[0],
628 				.n_voltages = ARRAY_SIZE(vout2_volt_table),
629 				.vsel_reg = BD957X_REG_VOUT2_TUNE,
630 				.vsel_mask = BD957X_MASK_VOUT2_TUNE,
631 				.enable_reg = BD957X_REG_POW_TRIGGER2,
632 				.enable_mask = BD957X_REGULATOR_EN_MASK,
633 				.enable_val = BD957X_REGULATOR_DIS_VAL,
634 				.enable_is_inverted = true,
635 				.owner = THIS_MODULE,
636 			},
637 			.xvd_ranges = vout234_xvd_ranges,
638 			.num_xvd_ranges = ARRAY_SIZE(vout234_xvd_ranges),
639 			.ovd_reg = BD9576_REG_VOUT2_OVD,
640 			.uvd_reg = BD9576_REG_VOUT2_UVD,
641 			.xvd_mask = BD9576_MASK_XVD,
642 		},
643 		{
644 			.desc = {
645 				.name = "VDDDR",
646 				.of_match = of_match_ptr("regulator-vdddr"),
647 				.regulators_node = of_match_ptr("regulators"),
648 				.id = BD957X_VDDDR,
649 				.type = REGULATOR_VOLTAGE,
650 				.n_voltages = BD957X_VOUTS34_NUM_VOLT,
651 				.vsel_reg = BD957X_REG_VOUT3_TUNE,
652 				.vsel_mask = BD957X_MASK_VOUT3_TUNE,
653 				.enable_reg = BD957X_REG_POW_TRIGGER3,
654 				.enable_mask = BD957X_REGULATOR_EN_MASK,
655 				.enable_val = BD957X_REGULATOR_DIS_VAL,
656 				.enable_is_inverted = true,
657 				.owner = THIS_MODULE,
658 			},
659 			.ovd_reg = BD9576_REG_VOUT3_OVD,
660 			.uvd_reg = BD9576_REG_VOUT3_UVD,
661 			.xvd_mask = BD9576_MASK_XVD,
662 			.xvd_ranges = vout234_xvd_ranges,
663 			.num_xvd_ranges = ARRAY_SIZE(vout234_xvd_ranges),
664 		},
665 		{
666 			.desc = {
667 				.name = "VD10",
668 				.of_match = of_match_ptr("regulator-vd10"),
669 				.regulators_node = of_match_ptr("regulators"),
670 				.id = BD957X_VD10,
671 				.type = REGULATOR_VOLTAGE,
672 				.fixed_uV = BD957X_VOUTS4_BASE_VOLT,
673 				.n_voltages = BD957X_VOUTS34_NUM_VOLT,
674 				.vsel_reg = BD957X_REG_VOUT4_TUNE,
675 				.vsel_mask = BD957X_MASK_VOUT4_TUNE,
676 				.enable_reg = BD957X_REG_POW_TRIGGER4,
677 				.enable_mask = BD957X_REGULATOR_EN_MASK,
678 				.enable_val = BD957X_REGULATOR_DIS_VAL,
679 				.enable_is_inverted = true,
680 				.owner = THIS_MODULE,
681 			},
682 			.xvd_ranges = vout234_xvd_ranges,
683 			.num_xvd_ranges = ARRAY_SIZE(vout234_xvd_ranges),
684 			.ovd_reg = BD9576_REG_VOUT4_OVD,
685 			.uvd_reg = BD9576_REG_VOUT4_UVD,
686 			.xvd_mask = BD9576_MASK_XVD,
687 		},
688 		{
689 			.desc = {
690 				.name = "VOUTL1",
691 				.of_match = of_match_ptr("regulator-voutl1"),
692 				.regulators_node = of_match_ptr("regulators"),
693 				.id = BD957X_VOUTL1,
694 				.type = REGULATOR_VOLTAGE,
695 				.volt_table = &voutl1_volt_table[0],
696 				.n_voltages = ARRAY_SIZE(voutl1_volt_table),
697 				.vsel_reg = BD957X_REG_VOUTL1_TUNE,
698 				.vsel_mask = BD957X_MASK_VOUTL1_TUNE,
699 				.enable_reg = BD957X_REG_POW_TRIGGERL1,
700 				.enable_mask = BD957X_REGULATOR_EN_MASK,
701 				.enable_val = BD957X_REGULATOR_DIS_VAL,
702 				.enable_is_inverted = true,
703 				.owner = THIS_MODULE,
704 			},
705 			.xvd_ranges = voutL1_xvd_ranges,
706 			.num_xvd_ranges = ARRAY_SIZE(voutL1_xvd_ranges),
707 			.ovd_reg = BD9576_REG_VOUTL1_OVD,
708 			.uvd_reg = BD9576_REG_VOUTL1_UVD,
709 			.xvd_mask = BD9576_MASK_XVD,
710 		},
711 		{
712 			.desc = {
713 				.name = "VOUTS1",
714 				.of_match = of_match_ptr("regulator-vouts1"),
715 				.regulators_node = of_match_ptr("regulators"),
716 				.id = BD957X_VOUTS1,
717 				.type = REGULATOR_VOLTAGE,
718 				.n_voltages = 1,
719 				.fixed_uV = BD957X_VOUTS1_VOLT,
720 				.enable_reg = BD957X_REG_POW_TRIGGERS1,
721 				.enable_mask = BD957X_REGULATOR_EN_MASK,
722 				.enable_val = BD957X_REGULATOR_DIS_VAL,
723 				.enable_is_inverted = true,
724 				.owner = THIS_MODULE,
725 				.of_parse_cb = vouts1_get_fet_res,
726 			},
727 			.oc_supported = true,
728 			.ocw_reg = BD9576_REG_VOUT1S_OCW,
729 			.ocw_mask = BD9576_MASK_VOUT1S_OCW,
730 			.ocp_reg = BD9576_REG_VOUT1S_OCP,
731 			.ocp_mask = BD9576_MASK_VOUT1S_OCP,
732 		},
733 	},
734 };
735 
736 static int bd9576_renable(struct regulator_irq_data *rid, int reg, int mask)
737 {
738 	int val, ret;
739 	struct bd957x_data *d = (struct bd957x_data *)rid->data;
740 
741 	ret = regmap_read(d->regmap, reg, &val);
742 	if (ret)
743 		return REGULATOR_FAILED_RETRY;
744 
745 	if (rid->opaque && rid->opaque == (val & mask)) {
746 		/*
747 		 * It seems we stil have same status. Ack and return
748 		 * information that we are still out of limits and core
749 		 * should not enable IRQ
750 		 */
751 		regmap_write(d->regmap, reg, mask & val);
752 		return REGULATOR_ERROR_ON;
753 	}
754 	rid->opaque = 0;
755 	/*
756 	 * Status was changed. Either prolem was solved or we have new issues.
757 	 * Let's re-enable IRQs and be prepared to report problems again
758 	 */
759 	return REGULATOR_ERROR_CLEARED;
760 }
761 
762 static int bd9576_uvd_renable(struct regulator_irq_data *rid)
763 {
764 	return bd9576_renable(rid, BD957X_REG_INT_UVD_STAT, UVD_IRQ_VALID_MASK);
765 }
766 
767 static int bd9576_ovd_renable(struct regulator_irq_data *rid)
768 {
769 	return bd9576_renable(rid, BD957X_REG_INT_OVD_STAT, OVD_IRQ_VALID_MASK);
770 }
771 
772 static int bd9576_temp_renable(struct regulator_irq_data *rid)
773 {
774 	return bd9576_renable(rid, BD957X_REG_INT_THERM_STAT,
775 			      BD9576_THERM_IRQ_MASK_TW);
776 }
777 
778 static int bd9576_uvd_handler(int irq, struct regulator_irq_data *rid,
779 			      unsigned long *dev_mask)
780 {
781 	int val, ret, i;
782 	struct bd957x_data *d = (struct bd957x_data *)rid->data;
783 
784 	ret = regmap_read(d->regmap, BD957X_REG_INT_UVD_STAT, &val);
785 	if (ret)
786 		return REGULATOR_FAILED_RETRY;
787 
788 	*dev_mask = 0;
789 
790 	rid->opaque = val & UVD_IRQ_VALID_MASK;
791 
792 	/*
793 	 * Go through the set status bits and report either error or warning
794 	 * to the notifier depending on what was flagged in DT
795 	 */
796 	*dev_mask = val & BD9576_xVD_IRQ_MASK_VOUT1TO4;
797 	/* There is 1 bit gap in register after Vout1 .. Vout4 statuses */
798 	*dev_mask |= ((val & BD9576_xVD_IRQ_MASK_VOUTL1) >> 1);
799 	/*
800 	 * We (ab)use the uvd for OCW notification. DT parsing should
801 	 * have added correct OCW flag to uvd_notif and uvd_err for S1
802 	 */
803 	*dev_mask |= ((val & BD9576_UVD_IRQ_MASK_VOUTS1_OCW) >> 1);
804 
805 	for_each_set_bit(i, dev_mask, 6) {
806 		struct bd957x_regulator_data *rdata;
807 		struct regulator_err_state *stat;
808 
809 		rdata = &d->regulator_data[i];
810 		stat  = &rid->states[i];
811 
812 		stat->notifs	= rdata->uvd_notif;
813 		stat->errors	= rdata->uvd_err;
814 	}
815 
816 	ret = regmap_write(d->regmap, BD957X_REG_INT_UVD_STAT,
817 			   UVD_IRQ_VALID_MASK & val);
818 
819 	return 0;
820 }
821 
822 static int bd9576_ovd_handler(int irq, struct regulator_irq_data *rid,
823 			      unsigned long *dev_mask)
824 {
825 	int val, ret, i;
826 	struct bd957x_data *d = (struct bd957x_data *)rid->data;
827 
828 	ret = regmap_read(d->regmap, BD957X_REG_INT_OVD_STAT, &val);
829 	if (ret)
830 		return REGULATOR_FAILED_RETRY;
831 
832 	rid->opaque = val & OVD_IRQ_VALID_MASK;
833 	*dev_mask = 0;
834 
835 	if (!(val & OVD_IRQ_VALID_MASK))
836 		return 0;
837 
838 	*dev_mask = val & BD9576_xVD_IRQ_MASK_VOUT1TO4;
839 	/* There is 1 bit gap in register after Vout1 .. Vout4 statuses */
840 	*dev_mask |= ((val & BD9576_xVD_IRQ_MASK_VOUTL1) >> 1);
841 
842 	for_each_set_bit(i, dev_mask, 5) {
843 		struct bd957x_regulator_data *rdata;
844 		struct regulator_err_state *stat;
845 
846 		rdata = &d->regulator_data[i];
847 		stat  = &rid->states[i];
848 
849 		stat->notifs	= rdata->ovd_notif;
850 		stat->errors	= rdata->ovd_err;
851 	}
852 
853 	/* Clear the sub-IRQ status */
854 	regmap_write(d->regmap, BD957X_REG_INT_OVD_STAT,
855 		     OVD_IRQ_VALID_MASK & val);
856 
857 	return 0;
858 }
859 
860 #define BD9576_DEV_MASK_ALL_REGULATORS 0x3F
861 
862 static int bd9576_thermal_handler(int irq, struct regulator_irq_data *rid,
863 				  unsigned long *dev_mask)
864 {
865 	int val, ret, i;
866 	struct bd957x_data *d = (struct bd957x_data *)rid->data;
867 
868 	ret = regmap_read(d->regmap, BD957X_REG_INT_THERM_STAT, &val);
869 	if (ret)
870 		return REGULATOR_FAILED_RETRY;
871 
872 	if (!(val & BD9576_THERM_IRQ_MASK_TW)) {
873 		*dev_mask = 0;
874 		return 0;
875 	}
876 
877 	*dev_mask = BD9576_DEV_MASK_ALL_REGULATORS;
878 
879 	for (i = 0; i < BD9576_NUM_REGULATORS; i++) {
880 		struct bd957x_regulator_data *rdata;
881 		struct regulator_err_state *stat;
882 
883 		rdata = &d->regulator_data[i];
884 		stat  = &rid->states[i];
885 
886 		stat->notifs	= rdata->temp_notif;
887 		stat->errors	= rdata->temp_err;
888 	}
889 
890 	/* Clear the sub-IRQ status */
891 	regmap_write(d->regmap, BD957X_REG_INT_THERM_STAT,
892 		     BD9576_THERM_IRQ_MASK_TW);
893 
894 	return 0;
895 }
896 
897 static int bd957x_probe(struct platform_device *pdev)
898 {
899 	int i;
900 	unsigned int num_reg_data;
901 	bool vout_mode, ddr_sel, may_have_irqs = false;
902 	struct regmap *regmap;
903 	struct bd957x_data *ic_data;
904 	struct regulator_config config = { 0 };
905 	/* All regulators are related to UVD and thermal IRQs... */
906 	struct regulator_dev *rdevs[BD9576_NUM_REGULATORS];
907 	/* ...But VoutS1 is not flagged by OVD IRQ */
908 	struct regulator_dev *ovd_devs[BD9576_NUM_OVD_REGULATORS];
909 	static const struct regulator_irq_desc bd9576_notif_uvd = {
910 		.name = "bd9576-uvd",
911 		.irq_off_ms = 1000,
912 		.map_event = bd9576_uvd_handler,
913 		.renable = bd9576_uvd_renable,
914 		.data = &bd957x_regulators,
915 	};
916 	static const struct regulator_irq_desc bd9576_notif_ovd = {
917 		.name = "bd9576-ovd",
918 		.irq_off_ms = 1000,
919 		.map_event = bd9576_ovd_handler,
920 		.renable = bd9576_ovd_renable,
921 		.data = &bd957x_regulators,
922 	};
923 	static const struct regulator_irq_desc bd9576_notif_temp = {
924 		.name = "bd9576-temp",
925 		.irq_off_ms = 1000,
926 		.map_event = bd9576_thermal_handler,
927 		.renable = bd9576_temp_renable,
928 		.data = &bd957x_regulators,
929 	};
930 	enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
931 
932 	num_reg_data = ARRAY_SIZE(bd957x_regulators.regulator_data);
933 
934 	ic_data = &bd957x_regulators;
935 
936 	regmap = dev_get_regmap(pdev->dev.parent, NULL);
937 	if (!regmap) {
938 		dev_err(&pdev->dev, "No regmap\n");
939 		return -EINVAL;
940 	}
941 
942 	ic_data->regmap = regmap;
943 	vout_mode = device_property_read_bool(pdev->dev.parent,
944 					      "rohm,vout1-en-low");
945 	if (vout_mode) {
946 		struct gpio_desc *en;
947 
948 		dev_dbg(&pdev->dev, "GPIO controlled mode\n");
949 
950 		/* VOUT1 enable state judged by VOUT1_EN pin */
951 		/* See if we have GPIO defined */
952 		en = devm_fwnode_gpiod_get(&pdev->dev,
953 					   dev_fwnode(pdev->dev.parent),
954 					   "rohm,vout1-en", GPIOD_OUT_LOW,
955 					   "vout1-en");
956 		if (!IS_ERR(en)) {
957 			/* VOUT1_OPS gpio ctrl */
958 			/*
959 			 * Regulator core prioritizes the ena_gpio over
960 			 * enable/disable/is_enabled callbacks so no need to
961 			 * clear them. We can still use same ops
962 			 */
963 			config.ena_gpiod = en;
964 		} else {
965 			/*
966 			 * In theory it is possible someone wants to set
967 			 * vout1-en LOW during OTP loading and set VOUT1 to be
968 			 * controlled by GPIO - but control the GPIO from some
969 			 * where else than this driver. For that to work we
970 			 * should unset the is_enabled callback here.
971 			 *
972 			 * I believe such case where rohm,vout1-en-low is set
973 			 * and vout1-en-gpios is not is likely to be a
974 			 * misconfiguration. So let's just err out for now.
975 			 */
976 			dev_err(&pdev->dev,
977 				"Failed to get VOUT1 control GPIO\n");
978 			return PTR_ERR(en);
979 		}
980 	}
981 
982 	/*
983 	 * If more than one PMIC needs to be controlled by same processor then
984 	 * allocate the regulator data array here and use bd9576_regulators as
985 	 * template. At the moment I see no such use-case so I spare some
986 	 * bytes and use bd9576_regulators directly for non-constant configs
987 	 * like DDR voltage selection.
988 	 */
989 	platform_set_drvdata(pdev, ic_data);
990 	ddr_sel = device_property_read_bool(pdev->dev.parent,
991 					    "rohm,ddr-sel-low");
992 	if (ddr_sel)
993 		ic_data->regulator_data[2].desc.fixed_uV = 1350000;
994 	else
995 		ic_data->regulator_data[2].desc.fixed_uV = 1500000;
996 
997 	switch (chip) {
998 	case ROHM_CHIP_TYPE_BD9576:
999 		may_have_irqs = true;
1000 		dev_dbg(&pdev->dev, "Found BD9576MUF\n");
1001 		break;
1002 	case ROHM_CHIP_TYPE_BD9573:
1003 		dev_dbg(&pdev->dev, "Found BD9573MUF\n");
1004 		break;
1005 	default:
1006 		dev_err(&pdev->dev, "Unsupported chip type\n");
1007 		return -EINVAL;
1008 	}
1009 
1010 	for (i = 0; i < num_reg_data; i++) {
1011 		struct regulator_desc *d;
1012 
1013 		d = &ic_data->regulator_data[i].desc;
1014 
1015 
1016 		if (may_have_irqs) {
1017 			if (d->id >= ARRAY_SIZE(bd9576_ops_arr))
1018 				return -EINVAL;
1019 
1020 			d->ops = bd9576_ops_arr[d->id];
1021 		} else {
1022 			if (d->id >= ARRAY_SIZE(bd9573_ops_arr))
1023 				return -EINVAL;
1024 
1025 			d->ops = bd9573_ops_arr[d->id];
1026 		}
1027 	}
1028 
1029 	config.dev = pdev->dev.parent;
1030 	config.regmap = regmap;
1031 	config.driver_data = ic_data;
1032 
1033 	for (i = 0; i < num_reg_data; i++) {
1034 
1035 		struct bd957x_regulator_data *r = &ic_data->regulator_data[i];
1036 		const struct regulator_desc *desc = &r->desc;
1037 
1038 		r->rdev = devm_regulator_register(&pdev->dev, desc,
1039 							   &config);
1040 		if (IS_ERR(r->rdev)) {
1041 			dev_err(&pdev->dev,
1042 				"failed to register %s regulator\n",
1043 				desc->name);
1044 			return PTR_ERR(r->rdev);
1045 		}
1046 		/*
1047 		 * Clear the VOUT1 GPIO setting - rest of the regulators do not
1048 		 * support GPIO control
1049 		 */
1050 		config.ena_gpiod = NULL;
1051 
1052 		if (!may_have_irqs)
1053 			continue;
1054 
1055 		rdevs[i] = r->rdev;
1056 		if (i < BD957X_VOUTS1)
1057 			ovd_devs[i] = r->rdev;
1058 	}
1059 	if (may_have_irqs) {
1060 		void *ret;
1061 		/*
1062 		 * We can add both the possible error and warning flags here
1063 		 * because the core uses these only for status clearing and
1064 		 * if we use warnings - errors are always clear and the other
1065 		 * way around. We can also add CURRENT flag for all regulators
1066 		 * because it is never set if it is not supported. Same applies
1067 		 * to setting UVD for VoutS1 - it is not accidentally cleared
1068 		 * as it is never set.
1069 		 */
1070 		int uvd_errs = REGULATOR_ERROR_UNDER_VOLTAGE |
1071 			       REGULATOR_ERROR_UNDER_VOLTAGE_WARN |
1072 			       REGULATOR_ERROR_OVER_CURRENT |
1073 			       REGULATOR_ERROR_OVER_CURRENT_WARN;
1074 		int ovd_errs = REGULATOR_ERROR_OVER_VOLTAGE_WARN |
1075 			       REGULATOR_ERROR_REGULATION_OUT;
1076 		int temp_errs = REGULATOR_ERROR_OVER_TEMP |
1077 				REGULATOR_ERROR_OVER_TEMP_WARN;
1078 		int irq;
1079 
1080 		irq = platform_get_irq_byname(pdev, "bd9576-uvd");
1081 
1082 		/* Register notifiers - can fail if IRQ is not given */
1083 		ret = devm_regulator_irq_helper(&pdev->dev, &bd9576_notif_uvd,
1084 						irq, 0, uvd_errs, NULL,
1085 						&rdevs[0],
1086 						BD9576_NUM_REGULATORS);
1087 		if (IS_ERR(ret)) {
1088 			if (PTR_ERR(ret) == -EPROBE_DEFER)
1089 				return -EPROBE_DEFER;
1090 
1091 			dev_warn(&pdev->dev, "UVD disabled %pe\n", ret);
1092 		}
1093 
1094 		irq = platform_get_irq_byname(pdev, "bd9576-ovd");
1095 
1096 		ret = devm_regulator_irq_helper(&pdev->dev, &bd9576_notif_ovd,
1097 						irq, 0, ovd_errs, NULL,
1098 						&ovd_devs[0],
1099 						BD9576_NUM_OVD_REGULATORS);
1100 		if (IS_ERR(ret)) {
1101 			if (PTR_ERR(ret) == -EPROBE_DEFER)
1102 				return -EPROBE_DEFER;
1103 
1104 			dev_warn(&pdev->dev, "OVD disabled %pe\n", ret);
1105 		}
1106 		irq = platform_get_irq_byname(pdev, "bd9576-temp");
1107 
1108 		ret = devm_regulator_irq_helper(&pdev->dev, &bd9576_notif_temp,
1109 						irq, 0, temp_errs, NULL,
1110 						&rdevs[0],
1111 						BD9576_NUM_REGULATORS);
1112 		if (IS_ERR(ret)) {
1113 			if (PTR_ERR(ret) == -EPROBE_DEFER)
1114 				return -EPROBE_DEFER;
1115 
1116 			dev_warn(&pdev->dev, "Thermal warning disabled %pe\n",
1117 				 ret);
1118 		}
1119 	}
1120 	return 0;
1121 }
1122 
1123 static const struct platform_device_id bd957x_pmic_id[] = {
1124 	{ "bd9573-regulator", ROHM_CHIP_TYPE_BD9573 },
1125 	{ "bd9576-regulator", ROHM_CHIP_TYPE_BD9576 },
1126 	{ },
1127 };
1128 MODULE_DEVICE_TABLE(platform, bd957x_pmic_id);
1129 
1130 static struct platform_driver bd957x_regulator = {
1131 	.driver = {
1132 		.name = "bd957x-pmic",
1133 	},
1134 	.probe = bd957x_probe,
1135 	.id_table = bd957x_pmic_id,
1136 };
1137 
1138 module_platform_driver(bd957x_regulator);
1139 
1140 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
1141 MODULE_DESCRIPTION("ROHM BD9576/BD9573 voltage regulator driver");
1142 MODULE_LICENSE("GPL");
1143 MODULE_ALIAS("platform:bd957x-pmic");
1144