1 /*
2  * Regulator driver for Rockchip RK808/RK818
3  *
4  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
5  *
6  * Author: Chris Zhong <zyw@rock-chips.com>
7  * Author: Zhang Qing <zhangqing@rock-chips.com>
8  *
9  * Copyright (C) 2016 PHYTEC Messtechnik GmbH
10  *
11  * Author: Wadim Egorov <w.egorov@phytec.de>
12  *
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms and conditions of the GNU General Public License,
15  * version 2, as published by the Free Software Foundation.
16  *
17  * This program is distributed in the hope it will be useful, but WITHOUT
18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
20  * more details.
21  */
22 
23 #include <linux/delay.h>
24 #include <linux/gpio.h>
25 #include <linux/i2c.h>
26 #include <linux/module.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/mfd/rk808.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/of_regulator.h>
32 #include <linux/gpio/consumer.h>
33 
34 /* Field Definitions */
35 #define RK808_BUCK_VSEL_MASK	0x3f
36 #define RK808_BUCK4_VSEL_MASK	0xf
37 #define RK808_LDO_VSEL_MASK	0x1f
38 
39 #define RK818_BUCK_VSEL_MASK		0x3f
40 #define RK818_BUCK4_VSEL_MASK		0x1f
41 #define RK818_LDO_VSEL_MASK		0x1f
42 #define RK818_LDO3_ON_VSEL_MASK		0xf
43 #define RK818_BOOST_ON_VSEL_MASK	0xe0
44 
45 /* Ramp rate definitions for buck1 / buck2 only */
46 #define RK808_RAMP_RATE_OFFSET		3
47 #define RK808_RAMP_RATE_MASK		(3 << RK808_RAMP_RATE_OFFSET)
48 #define RK808_RAMP_RATE_2MV_PER_US	(0 << RK808_RAMP_RATE_OFFSET)
49 #define RK808_RAMP_RATE_4MV_PER_US	(1 << RK808_RAMP_RATE_OFFSET)
50 #define RK808_RAMP_RATE_6MV_PER_US	(2 << RK808_RAMP_RATE_OFFSET)
51 #define RK808_RAMP_RATE_10MV_PER_US	(3 << RK808_RAMP_RATE_OFFSET)
52 
53 #define RK808_DVS2_POL		BIT(2)
54 #define RK808_DVS1_POL		BIT(1)
55 
56 /* Offset from XXX_ON_VSEL to XXX_SLP_VSEL */
57 #define RK808_SLP_REG_OFFSET 1
58 
59 /* Offset from XXX_ON_VSEL to XXX_DVS_VSEL */
60 #define RK808_DVS_REG_OFFSET 2
61 
62 /* Offset from XXX_EN_REG to SLEEP_SET_OFF_XXX */
63 #define RK808_SLP_SET_OFF_REG_OFFSET 2
64 
65 /* max steps for increase voltage of Buck1/2, equal 100mv*/
66 #define MAX_STEPS_ONE_TIME 8
67 
68 #define RK8XX_DESC(_id, _match, _supply, _min, _max, _step, _vreg,	\
69 	_vmask, _ereg, _emask, _etime)					\
70 	[_id] = {							\
71 		.name		= (_match),				\
72 		.supply_name	= (_supply),				\
73 		.of_match	= of_match_ptr(_match),			\
74 		.regulators_node = of_match_ptr("regulators"),		\
75 		.type		= REGULATOR_VOLTAGE,			\
76 		.id		= (_id),				\
77 		.n_voltages	= (((_max) - (_min)) / (_step) + 1),	\
78 		.owner		= THIS_MODULE,				\
79 		.min_uV		= (_min) * 1000,			\
80 		.uV_step	= (_step) * 1000,			\
81 		.vsel_reg	= (_vreg),				\
82 		.vsel_mask	= (_vmask),				\
83 		.enable_reg	= (_ereg),				\
84 		.enable_mask	= (_emask),				\
85 		.enable_time	= (_etime),				\
86 		.ops		= &rk808_reg_ops,			\
87 	}
88 
89 #define RK8XX_DESC_SWITCH(_id, _match, _supply, _ereg, _emask)		\
90 	[_id] = {							\
91 		.name		= (_match),				\
92 		.supply_name	= (_supply),				\
93 		.of_match	= of_match_ptr(_match),			\
94 		.regulators_node = of_match_ptr("regulators"),		\
95 		.type		= REGULATOR_VOLTAGE,			\
96 		.id		= (_id),				\
97 		.enable_reg	= (_ereg),				\
98 		.enable_mask	= (_emask),				\
99 		.owner		= THIS_MODULE,				\
100 		.ops		= &rk808_switch_ops			\
101 	}
102 
103 
104 struct rk808_regulator_data {
105 	struct gpio_desc *dvs_gpio[2];
106 };
107 
108 static const int rk808_buck_config_regs[] = {
109 	RK808_BUCK1_CONFIG_REG,
110 	RK808_BUCK2_CONFIG_REG,
111 	RK808_BUCK3_CONFIG_REG,
112 	RK808_BUCK4_CONFIG_REG,
113 };
114 
115 static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = {
116 	REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000),
117 	REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0),
118 };
119 
120 static int rk808_buck1_2_get_voltage_sel_regmap(struct regulator_dev *rdev)
121 {
122 	struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
123 	int id = rdev->desc->id - RK808_ID_DCDC1;
124 	struct gpio_desc *gpio = pdata->dvs_gpio[id];
125 	unsigned int val;
126 	int ret;
127 
128 	if (!gpio || gpiod_get_value(gpio) == 0)
129 		return regulator_get_voltage_sel_regmap(rdev);
130 
131 	ret = regmap_read(rdev->regmap,
132 			  rdev->desc->vsel_reg + RK808_DVS_REG_OFFSET,
133 			  &val);
134 	if (ret != 0)
135 		return ret;
136 
137 	val &= rdev->desc->vsel_mask;
138 	val >>= ffs(rdev->desc->vsel_mask) - 1;
139 
140 	return val;
141 }
142 
143 static int rk808_buck1_2_i2c_set_voltage_sel(struct regulator_dev *rdev,
144 					     unsigned sel)
145 {
146 	int ret, delta_sel;
147 	unsigned int old_sel, tmp, val, mask = rdev->desc->vsel_mask;
148 
149 	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
150 	if (ret != 0)
151 		return ret;
152 
153 	tmp = val & ~mask;
154 	old_sel = val & mask;
155 	old_sel >>= ffs(mask) - 1;
156 	delta_sel = sel - old_sel;
157 
158 	/*
159 	 * If directly modify the register to change the voltage, we will face
160 	 * the risk of overshoot. Put it into a multi-step, can effectively
161 	 * avoid this problem, a step is 100mv here.
162 	 */
163 	while (delta_sel > MAX_STEPS_ONE_TIME) {
164 		old_sel += MAX_STEPS_ONE_TIME;
165 		val = old_sel << (ffs(mask) - 1);
166 		val |= tmp;
167 
168 		/*
169 		 * i2c is 400kHz (2.5us per bit) and we must transmit _at least_
170 		 * 3 bytes (24 bits) plus start and stop so 26 bits.  So we've
171 		 * got more than 65 us between each voltage change and thus
172 		 * won't ramp faster than ~1500 uV / us.
173 		 */
174 		ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
175 		delta_sel = sel - old_sel;
176 	}
177 
178 	sel <<= ffs(mask) - 1;
179 	val = tmp | sel;
180 	ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
181 
182 	/*
183 	 * When we change the voltage register directly, the ramp rate is about
184 	 * 100000uv/us, wait 1us to make sure the target voltage to be stable,
185 	 * so we needn't wait extra time after that.
186 	 */
187 	udelay(1);
188 
189 	return ret;
190 }
191 
192 static int rk808_buck1_2_set_voltage_sel(struct regulator_dev *rdev,
193 					 unsigned sel)
194 {
195 	struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
196 	int id = rdev->desc->id - RK808_ID_DCDC1;
197 	struct gpio_desc *gpio = pdata->dvs_gpio[id];
198 	unsigned int reg = rdev->desc->vsel_reg;
199 	unsigned old_sel;
200 	int ret, gpio_level;
201 
202 	if (!gpio)
203 		return rk808_buck1_2_i2c_set_voltage_sel(rdev, sel);
204 
205 	gpio_level = gpiod_get_value(gpio);
206 	if (gpio_level == 0) {
207 		reg += RK808_DVS_REG_OFFSET;
208 		ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &old_sel);
209 	} else {
210 		ret = regmap_read(rdev->regmap,
211 				  reg + RK808_DVS_REG_OFFSET,
212 				  &old_sel);
213 	}
214 
215 	if (ret != 0)
216 		return ret;
217 
218 	sel <<= ffs(rdev->desc->vsel_mask) - 1;
219 	sel |= old_sel & ~rdev->desc->vsel_mask;
220 
221 	ret = regmap_write(rdev->regmap, reg, sel);
222 	if (ret)
223 		return ret;
224 
225 	gpiod_set_value(gpio, !gpio_level);
226 
227 	return ret;
228 }
229 
230 static int rk808_buck1_2_set_voltage_time_sel(struct regulator_dev *rdev,
231 				       unsigned int old_selector,
232 				       unsigned int new_selector)
233 {
234 	struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
235 	int id = rdev->desc->id - RK808_ID_DCDC1;
236 	struct gpio_desc *gpio = pdata->dvs_gpio[id];
237 
238 	/* if there is no dvs1/2 pin, we don't need wait extra time here. */
239 	if (!gpio)
240 		return 0;
241 
242 	return regulator_set_voltage_time_sel(rdev, old_selector, new_selector);
243 }
244 
245 static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
246 {
247 	unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US;
248 	unsigned int reg = rk808_buck_config_regs[rdev->desc->id -
249 						  RK808_ID_DCDC1];
250 
251 	switch (ramp_delay) {
252 	case 1 ... 2000:
253 		ramp_value = RK808_RAMP_RATE_2MV_PER_US;
254 		break;
255 	case 2001 ... 4000:
256 		ramp_value = RK808_RAMP_RATE_4MV_PER_US;
257 		break;
258 	case 4001 ... 6000:
259 		ramp_value = RK808_RAMP_RATE_6MV_PER_US;
260 		break;
261 	case 6001 ... 10000:
262 		break;
263 	default:
264 		pr_warn("%s ramp_delay: %d not supported, setting 10000\n",
265 			rdev->desc->name, ramp_delay);
266 	}
267 
268 	return regmap_update_bits(rdev->regmap, reg,
269 				  RK808_RAMP_RATE_MASK, ramp_value);
270 }
271 
272 static int rk808_set_suspend_voltage(struct regulator_dev *rdev, int uv)
273 {
274 	unsigned int reg;
275 	int sel = regulator_map_voltage_linear(rdev, uv, uv);
276 
277 	if (sel < 0)
278 		return -EINVAL;
279 
280 	reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
281 
282 	return regmap_update_bits(rdev->regmap, reg,
283 				  rdev->desc->vsel_mask,
284 				  sel);
285 }
286 
287 static int rk808_set_suspend_voltage_range(struct regulator_dev *rdev, int uv)
288 {
289 	unsigned int reg;
290 	int sel = regulator_map_voltage_linear_range(rdev, uv, uv);
291 
292 	if (sel < 0)
293 		return -EINVAL;
294 
295 	reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
296 
297 	return regmap_update_bits(rdev->regmap, reg,
298 				  rdev->desc->vsel_mask,
299 				  sel);
300 }
301 
302 static int rk808_set_suspend_enable(struct regulator_dev *rdev)
303 {
304 	unsigned int reg;
305 
306 	reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
307 
308 	return regmap_update_bits(rdev->regmap, reg,
309 				  rdev->desc->enable_mask,
310 				  0);
311 }
312 
313 static int rk808_set_suspend_disable(struct regulator_dev *rdev)
314 {
315 	unsigned int reg;
316 
317 	reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
318 
319 	return regmap_update_bits(rdev->regmap, reg,
320 				  rdev->desc->enable_mask,
321 				  rdev->desc->enable_mask);
322 }
323 
324 static struct regulator_ops rk808_buck1_2_ops = {
325 	.list_voltage		= regulator_list_voltage_linear,
326 	.map_voltage		= regulator_map_voltage_linear,
327 	.get_voltage_sel	= rk808_buck1_2_get_voltage_sel_regmap,
328 	.set_voltage_sel	= rk808_buck1_2_set_voltage_sel,
329 	.set_voltage_time_sel	= rk808_buck1_2_set_voltage_time_sel,
330 	.enable			= regulator_enable_regmap,
331 	.disable		= regulator_disable_regmap,
332 	.is_enabled		= regulator_is_enabled_regmap,
333 	.set_ramp_delay		= rk808_set_ramp_delay,
334 	.set_suspend_voltage	= rk808_set_suspend_voltage,
335 	.set_suspend_enable	= rk808_set_suspend_enable,
336 	.set_suspend_disable	= rk808_set_suspend_disable,
337 };
338 
339 static struct regulator_ops rk808_reg_ops = {
340 	.list_voltage		= regulator_list_voltage_linear,
341 	.map_voltage		= regulator_map_voltage_linear,
342 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
343 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
344 	.enable			= regulator_enable_regmap,
345 	.disable		= regulator_disable_regmap,
346 	.is_enabled		= regulator_is_enabled_regmap,
347 	.set_suspend_voltage	= rk808_set_suspend_voltage,
348 	.set_suspend_enable	= rk808_set_suspend_enable,
349 	.set_suspend_disable	= rk808_set_suspend_disable,
350 };
351 
352 static struct regulator_ops rk808_reg_ops_ranges = {
353 	.list_voltage		= regulator_list_voltage_linear_range,
354 	.map_voltage		= regulator_map_voltage_linear_range,
355 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
356 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
357 	.enable			= regulator_enable_regmap,
358 	.disable		= regulator_disable_regmap,
359 	.is_enabled		= regulator_is_enabled_regmap,
360 	.set_suspend_voltage	= rk808_set_suspend_voltage_range,
361 	.set_suspend_enable	= rk808_set_suspend_enable,
362 	.set_suspend_disable	= rk808_set_suspend_disable,
363 };
364 
365 static struct regulator_ops rk808_switch_ops = {
366 	.enable			= regulator_enable_regmap,
367 	.disable		= regulator_disable_regmap,
368 	.is_enabled		= regulator_is_enabled_regmap,
369 	.set_suspend_enable	= rk808_set_suspend_enable,
370 	.set_suspend_disable	= rk808_set_suspend_disable,
371 };
372 
373 static const struct regulator_desc rk808_reg[] = {
374 	{
375 		.name = "DCDC_REG1",
376 		.supply_name = "vcc1",
377 		.of_match = of_match_ptr("DCDC_REG1"),
378 		.regulators_node = of_match_ptr("regulators"),
379 		.id = RK808_ID_DCDC1,
380 		.ops = &rk808_buck1_2_ops,
381 		.type = REGULATOR_VOLTAGE,
382 		.min_uV = 712500,
383 		.uV_step = 12500,
384 		.n_voltages = 64,
385 		.vsel_reg = RK808_BUCK1_ON_VSEL_REG,
386 		.vsel_mask = RK808_BUCK_VSEL_MASK,
387 		.enable_reg = RK808_DCDC_EN_REG,
388 		.enable_mask = BIT(0),
389 		.owner = THIS_MODULE,
390 	}, {
391 		.name = "DCDC_REG2",
392 		.supply_name = "vcc2",
393 		.of_match = of_match_ptr("DCDC_REG2"),
394 		.regulators_node = of_match_ptr("regulators"),
395 		.id = RK808_ID_DCDC2,
396 		.ops = &rk808_buck1_2_ops,
397 		.type = REGULATOR_VOLTAGE,
398 		.min_uV = 712500,
399 		.uV_step = 12500,
400 		.n_voltages = 64,
401 		.vsel_reg = RK808_BUCK2_ON_VSEL_REG,
402 		.vsel_mask = RK808_BUCK_VSEL_MASK,
403 		.enable_reg = RK808_DCDC_EN_REG,
404 		.enable_mask = BIT(1),
405 		.owner = THIS_MODULE,
406 	}, {
407 		.name = "DCDC_REG3",
408 		.supply_name = "vcc3",
409 		.of_match = of_match_ptr("DCDC_REG3"),
410 		.regulators_node = of_match_ptr("regulators"),
411 		.id = RK808_ID_DCDC3,
412 		.ops = &rk808_switch_ops,
413 		.type = REGULATOR_VOLTAGE,
414 		.n_voltages = 1,
415 		.enable_reg = RK808_DCDC_EN_REG,
416 		.enable_mask = BIT(2),
417 		.owner = THIS_MODULE,
418 	},
419 	RK8XX_DESC(RK808_ID_DCDC4, "DCDC_REG4", "vcc4", 1800, 3300, 100,
420 		RK808_BUCK4_ON_VSEL_REG, RK808_BUCK4_VSEL_MASK,
421 		RK808_DCDC_EN_REG, BIT(3), 0),
422 	RK8XX_DESC(RK808_ID_LDO1, "LDO_REG1", "vcc6", 1800, 3400, 100,
423 		RK808_LDO1_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
424 		BIT(0), 400),
425 	RK8XX_DESC(RK808_ID_LDO2, "LDO_REG2", "vcc6", 1800, 3400, 100,
426 		RK808_LDO2_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
427 		BIT(1), 400),
428 	{
429 		.name = "LDO_REG3",
430 		.supply_name = "vcc7",
431 		.of_match = of_match_ptr("LDO_REG3"),
432 		.regulators_node = of_match_ptr("regulators"),
433 		.id = RK808_ID_LDO3,
434 		.ops = &rk808_reg_ops_ranges,
435 		.type = REGULATOR_VOLTAGE,
436 		.n_voltages = 16,
437 		.linear_ranges = rk808_ldo3_voltage_ranges,
438 		.n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
439 		.vsel_reg = RK808_LDO3_ON_VSEL_REG,
440 		.vsel_mask = RK808_BUCK4_VSEL_MASK,
441 		.enable_reg = RK808_LDO_EN_REG,
442 		.enable_mask = BIT(2),
443 		.enable_time = 400,
444 		.owner = THIS_MODULE,
445 	},
446 	RK8XX_DESC(RK808_ID_LDO4, "LDO_REG4", "vcc9", 1800, 3400, 100,
447 		RK808_LDO4_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
448 		BIT(3), 400),
449 	RK8XX_DESC(RK808_ID_LDO5, "LDO_REG5", "vcc9", 1800, 3400, 100,
450 		RK808_LDO5_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
451 		BIT(4), 400),
452 	RK8XX_DESC(RK808_ID_LDO6, "LDO_REG6", "vcc10", 800, 2500, 100,
453 		RK808_LDO6_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
454 		BIT(5), 400),
455 	RK8XX_DESC(RK808_ID_LDO7, "LDO_REG7", "vcc7", 800, 2500, 100,
456 		RK808_LDO7_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
457 		BIT(6), 400),
458 	RK8XX_DESC(RK808_ID_LDO8, "LDO_REG8", "vcc11", 1800, 3400, 100,
459 		RK808_LDO8_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
460 		BIT(7), 400),
461 	RK8XX_DESC_SWITCH(RK808_ID_SWITCH1, "SWITCH_REG1", "vcc8",
462 		RK808_DCDC_EN_REG, BIT(5)),
463 	RK8XX_DESC_SWITCH(RK808_ID_SWITCH2, "SWITCH_REG2", "vcc12",
464 		RK808_DCDC_EN_REG, BIT(6)),
465 };
466 
467 static const struct regulator_desc rk818_reg[] = {
468 	{
469 		.name = "DCDC_REG1",
470 		.supply_name = "vcc1",
471 		.of_match = of_match_ptr("DCDC_REG1"),
472 		.regulators_node = of_match_ptr("regulators"),
473 		.id = RK818_ID_DCDC1,
474 		.ops = &rk808_reg_ops,
475 		.type = REGULATOR_VOLTAGE,
476 		.min_uV = 712500,
477 		.uV_step = 12500,
478 		.n_voltages = 64,
479 		.vsel_reg = RK818_BUCK1_ON_VSEL_REG,
480 		.vsel_mask = RK818_BUCK_VSEL_MASK,
481 		.enable_reg = RK818_DCDC_EN_REG,
482 		.enable_mask = BIT(0),
483 		.owner = THIS_MODULE,
484 	}, {
485 		.name = "DCDC_REG2",
486 		.supply_name = "vcc2",
487 		.of_match = of_match_ptr("DCDC_REG2"),
488 		.regulators_node = of_match_ptr("regulators"),
489 		.id = RK818_ID_DCDC2,
490 		.ops = &rk808_reg_ops,
491 		.type = REGULATOR_VOLTAGE,
492 		.min_uV = 712500,
493 		.uV_step = 12500,
494 		.n_voltages = 64,
495 		.vsel_reg = RK818_BUCK2_ON_VSEL_REG,
496 		.vsel_mask = RK818_BUCK_VSEL_MASK,
497 		.enable_reg = RK818_DCDC_EN_REG,
498 		.enable_mask = BIT(1),
499 		.owner = THIS_MODULE,
500 	}, {
501 		.name = "DCDC_REG3",
502 		.supply_name = "vcc3",
503 		.of_match = of_match_ptr("DCDC_REG3"),
504 		.regulators_node = of_match_ptr("regulators"),
505 		.id = RK818_ID_DCDC3,
506 		.ops = &rk808_switch_ops,
507 		.type = REGULATOR_VOLTAGE,
508 		.n_voltages = 1,
509 		.enable_reg = RK818_DCDC_EN_REG,
510 		.enable_mask = BIT(2),
511 		.owner = THIS_MODULE,
512 	},
513 	RK8XX_DESC(RK818_ID_DCDC4, "DCDC_REG4", "vcc4", 1800, 3600, 100,
514 		RK818_BUCK4_ON_VSEL_REG, RK818_BUCK4_VSEL_MASK,
515 		RK818_DCDC_EN_REG, BIT(3), 0),
516 	RK8XX_DESC(RK818_ID_BOOST, "DCDC_BOOST", "boost", 4700, 5400, 100,
517 		RK818_BOOST_LDO9_ON_VSEL_REG, RK818_BOOST_ON_VSEL_MASK,
518 		RK818_DCDC_EN_REG, BIT(4), 0),
519 	RK8XX_DESC(RK818_ID_LDO1, "LDO_REG1", "vcc6", 1800, 3400, 100,
520 		RK818_LDO1_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
521 		BIT(0), 400),
522 	RK8XX_DESC(RK818_ID_LDO2, "LDO_REG2", "vcc6", 1800, 3400, 100,
523 		RK818_LDO1_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
524 		BIT(1), 400),
525 	{
526 		.name = "LDO_REG3",
527 		.supply_name = "vcc7",
528 		.of_match = of_match_ptr("LDO_REG3"),
529 		.regulators_node = of_match_ptr("regulators"),
530 		.id = RK818_ID_LDO3,
531 		.ops = &rk808_reg_ops_ranges,
532 		.type = REGULATOR_VOLTAGE,
533 		.n_voltages = 16,
534 		.linear_ranges = rk808_ldo3_voltage_ranges,
535 		.n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
536 		.vsel_reg = RK818_LDO3_ON_VSEL_REG,
537 		.vsel_mask = RK818_LDO3_ON_VSEL_MASK,
538 		.enable_reg = RK818_LDO_EN_REG,
539 		.enable_mask = BIT(2),
540 		.enable_time = 400,
541 		.owner = THIS_MODULE,
542 	},
543 	RK8XX_DESC(RK818_ID_LDO4, "LDO_REG4", "vcc8", 1800, 3400, 100,
544 		RK818_LDO4_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
545 		BIT(3), 400),
546 	RK8XX_DESC(RK818_ID_LDO5, "LDO_REG5", "vcc7", 1800, 3400, 100,
547 		RK818_LDO5_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
548 		BIT(4), 400),
549 	RK8XX_DESC(RK818_ID_LDO6, "LDO_REG6", "vcc8", 800, 2500, 100,
550 		RK818_LDO6_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
551 		BIT(5), 400),
552 	RK8XX_DESC(RK818_ID_LDO7, "LDO_REG7", "vcc7", 800, 2500, 100,
553 		RK818_LDO7_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
554 		BIT(6), 400),
555 	RK8XX_DESC(RK818_ID_LDO8, "LDO_REG8", "vcc8", 1800, 3400, 100,
556 		RK818_LDO8_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
557 		BIT(7), 400),
558 	RK8XX_DESC(RK818_ID_LDO9, "LDO_REG9", "vcc9", 1800, 3400, 100,
559 		RK818_BOOST_LDO9_ON_VSEL_REG, RK818_LDO_VSEL_MASK,
560 		RK818_DCDC_EN_REG, BIT(5), 400),
561 	RK8XX_DESC_SWITCH(RK818_ID_SWITCH, "SWITCH_REG", "vcc9",
562 		RK818_DCDC_EN_REG, BIT(6)),
563 	RK8XX_DESC_SWITCH(RK818_ID_HDMI_SWITCH, "HDMI_SWITCH", "h_5v",
564 		RK818_H5V_EN_REG, BIT(0)),
565 	RK8XX_DESC_SWITCH(RK818_ID_OTG_SWITCH, "OTG_SWITCH", "usb",
566 		RK818_DCDC_EN_REG, BIT(7)),
567 };
568 
569 static int rk808_regulator_dt_parse_pdata(struct device *dev,
570 				   struct device *client_dev,
571 				   struct regmap *map,
572 				   struct rk808_regulator_data *pdata)
573 {
574 	struct device_node *np;
575 	int tmp, ret = 0, i;
576 
577 	np = of_get_child_by_name(client_dev->of_node, "regulators");
578 	if (!np)
579 		return -ENXIO;
580 
581 	for (i = 0; i < ARRAY_SIZE(pdata->dvs_gpio); i++) {
582 		pdata->dvs_gpio[i] =
583 			devm_gpiod_get_index_optional(client_dev, "dvs", i,
584 						      GPIOD_OUT_LOW);
585 		if (IS_ERR(pdata->dvs_gpio[i])) {
586 			ret = PTR_ERR(pdata->dvs_gpio[i]);
587 			dev_err(dev, "failed to get dvs%d gpio (%d)\n", i, ret);
588 			goto dt_parse_end;
589 		}
590 
591 		if (!pdata->dvs_gpio[i]) {
592 			dev_warn(dev, "there is no dvs%d gpio\n", i);
593 			continue;
594 		}
595 
596 		tmp = i ? RK808_DVS2_POL : RK808_DVS1_POL;
597 		ret = regmap_update_bits(map, RK808_IO_POL_REG, tmp,
598 				gpiod_is_active_low(pdata->dvs_gpio[i]) ?
599 				0 : tmp);
600 	}
601 
602 dt_parse_end:
603 	of_node_put(np);
604 	return ret;
605 }
606 
607 static int rk808_regulator_probe(struct platform_device *pdev)
608 {
609 	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
610 	struct i2c_client *client = rk808->i2c;
611 	struct regulator_config config = {};
612 	struct regulator_dev *rk808_rdev;
613 	struct rk808_regulator_data *pdata;
614 	const struct regulator_desc *regulators;
615 	int ret, i, nregulators;
616 
617 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
618 	if (!pdata)
619 		return -ENOMEM;
620 
621 	ret = rk808_regulator_dt_parse_pdata(&pdev->dev, &client->dev,
622 					     rk808->regmap, pdata);
623 	if (ret < 0)
624 		return ret;
625 
626 	platform_set_drvdata(pdev, pdata);
627 
628 	switch (rk808->variant) {
629 	case RK808_ID:
630 		regulators = rk808_reg;
631 		nregulators = RK808_NUM_REGULATORS;
632 		break;
633 	case RK818_ID:
634 		regulators = rk818_reg;
635 		nregulators = RK818_NUM_REGULATORS;
636 		break;
637 	default:
638 		dev_err(&client->dev, "unsupported RK8XX ID %lu\n",
639 			rk808->variant);
640 		return -EINVAL;
641 	}
642 
643 	config.dev = &client->dev;
644 	config.driver_data = pdata;
645 	config.regmap = rk808->regmap;
646 
647 	/* Instantiate the regulators */
648 	for (i = 0; i < nregulators; i++) {
649 		rk808_rdev = devm_regulator_register(&pdev->dev,
650 						     &regulators[i], &config);
651 		if (IS_ERR(rk808_rdev)) {
652 			dev_err(&client->dev,
653 				"failed to register %d regulator\n", i);
654 			return PTR_ERR(rk808_rdev);
655 		}
656 	}
657 
658 	return 0;
659 }
660 
661 static struct platform_driver rk808_regulator_driver = {
662 	.probe = rk808_regulator_probe,
663 	.driver = {
664 		.name = "rk808-regulator"
665 	},
666 };
667 
668 module_platform_driver(rk808_regulator_driver);
669 
670 MODULE_DESCRIPTION("regulator driver for the RK808/RK818 series PMICs");
671 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
672 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
673 MODULE_AUTHOR("Wadim Egorov <w.egorov@phytec.de>");
674 MODULE_LICENSE("GPL");
675 MODULE_ALIAS("platform:rk808-regulator");
676