1 /*
2 * Regulator driver for Rockchip RK808
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 * This program is free software; you can redistribute it and/or modify it
10 * under the terms and conditions of the GNU General Public License,
11 * version 2, as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 */
18
19 #include <linux/module.h>
20 #include <linux/i2c.h>
21 #include <linux/mfd/rk808.h>
22 #include <linux/of_device.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/of_regulator.h>
25
26 /* Field Definitions */
27 #define RK808_BUCK_VSEL_MASK 0x3f
28 #define RK808_BUCK4_VSEL_MASK 0xf
29 #define RK808_LDO_VSEL_MASK 0x1f
30
31 /* Ramp rate definitions for buck1 / buck2 only */
32 #define RK808_RAMP_RATE_OFFSET 3
33 #define RK808_RAMP_RATE_MASK (3 << RK808_RAMP_RATE_OFFSET)
34 #define RK808_RAMP_RATE_2MV_PER_US (0 << RK808_RAMP_RATE_OFFSET)
35 #define RK808_RAMP_RATE_4MV_PER_US (1 << RK808_RAMP_RATE_OFFSET)
36 #define RK808_RAMP_RATE_6MV_PER_US (2 << RK808_RAMP_RATE_OFFSET)
37 #define RK808_RAMP_RATE_10MV_PER_US (3 << RK808_RAMP_RATE_OFFSET)
38
39 static const int rk808_buck_config_regs[] = {
40 RK808_BUCK1_CONFIG_REG,
41 RK808_BUCK2_CONFIG_REG,
42 RK808_BUCK3_CONFIG_REG,
43 RK808_BUCK4_CONFIG_REG,
44 };
45
46 static const struct regulator_linear_range rk808_buck_voltage_ranges[] = {
47 REGULATOR_LINEAR_RANGE(712500, 0, 63, 12500),
48 };
49
50 static const struct regulator_linear_range rk808_buck4_voltage_ranges[] = {
51 REGULATOR_LINEAR_RANGE(1800000, 0, 15, 100000),
52 };
53
54 static const struct regulator_linear_range rk808_ldo_voltage_ranges[] = {
55 REGULATOR_LINEAR_RANGE(1800000, 0, 16, 100000),
56 };
57
58 static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = {
59 REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000),
60 REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0),
61 };
62
63 static const struct regulator_linear_range rk808_ldo6_voltage_ranges[] = {
64 REGULATOR_LINEAR_RANGE(800000, 0, 17, 100000),
65 };
66
rk808_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)67 static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
68 {
69 unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US;
70 unsigned int reg = rk808_buck_config_regs[rdev->desc->id -
71 RK808_ID_DCDC1];
72
73 switch (ramp_delay) {
74 case 1 ... 2000:
75 ramp_value = RK808_RAMP_RATE_2MV_PER_US;
76 break;
77 case 2001 ... 4000:
78 ramp_value = RK808_RAMP_RATE_4MV_PER_US;
79 break;
80 case 4001 ... 6000:
81 ramp_value = RK808_RAMP_RATE_6MV_PER_US;
82 break;
83 case 6001 ... 10000:
84 break;
85 default:
86 pr_warn("%s ramp_delay: %d not supported, setting 10000\n",
87 rdev->desc->name, ramp_delay);
88 }
89
90 return regmap_update_bits(rdev->regmap, reg,
91 RK808_RAMP_RATE_MASK, ramp_value);
92 }
93
94 static struct regulator_ops rk808_buck1_2_ops = {
95 .list_voltage = regulator_list_voltage_linear_range,
96 .map_voltage = regulator_map_voltage_linear_range,
97 .get_voltage_sel = regulator_get_voltage_sel_regmap,
98 .set_voltage_sel = regulator_set_voltage_sel_regmap,
99 .enable = regulator_enable_regmap,
100 .disable = regulator_disable_regmap,
101 .is_enabled = regulator_is_enabled_regmap,
102 .set_ramp_delay = rk808_set_ramp_delay,
103 };
104
105 static struct regulator_ops rk808_reg_ops = {
106 .list_voltage = regulator_list_voltage_linear_range,
107 .map_voltage = regulator_map_voltage_linear_range,
108 .get_voltage_sel = regulator_get_voltage_sel_regmap,
109 .set_voltage_sel = regulator_set_voltage_sel_regmap,
110 .enable = regulator_enable_regmap,
111 .disable = regulator_disable_regmap,
112 .is_enabled = regulator_is_enabled_regmap,
113 };
114
115 static struct regulator_ops rk808_switch_ops = {
116 .enable = regulator_enable_regmap,
117 .disable = regulator_disable_regmap,
118 .is_enabled = regulator_is_enabled_regmap,
119 };
120
121 static const struct regulator_desc rk808_reg[] = {
122 {
123 .name = "DCDC_REG1",
124 .supply_name = "vcc1",
125 .id = RK808_ID_DCDC1,
126 .ops = &rk808_buck1_2_ops,
127 .type = REGULATOR_VOLTAGE,
128 .n_voltages = 64,
129 .linear_ranges = rk808_buck_voltage_ranges,
130 .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
131 .vsel_reg = RK808_BUCK1_ON_VSEL_REG,
132 .vsel_mask = RK808_BUCK_VSEL_MASK,
133 .enable_reg = RK808_DCDC_EN_REG,
134 .enable_mask = BIT(0),
135 .owner = THIS_MODULE,
136 }, {
137 .name = "DCDC_REG2",
138 .supply_name = "vcc2",
139 .id = RK808_ID_DCDC2,
140 .ops = &rk808_buck1_2_ops,
141 .type = REGULATOR_VOLTAGE,
142 .n_voltages = 64,
143 .linear_ranges = rk808_buck_voltage_ranges,
144 .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
145 .vsel_reg = RK808_BUCK2_ON_VSEL_REG,
146 .vsel_mask = RK808_BUCK_VSEL_MASK,
147 .enable_reg = RK808_DCDC_EN_REG,
148 .enable_mask = BIT(1),
149 .owner = THIS_MODULE,
150 }, {
151 .name = "DCDC_REG3",
152 .supply_name = "vcc3",
153 .id = RK808_ID_DCDC3,
154 .ops = &rk808_switch_ops,
155 .type = REGULATOR_VOLTAGE,
156 .n_voltages = 1,
157 .enable_reg = RK808_DCDC_EN_REG,
158 .enable_mask = BIT(2),
159 .owner = THIS_MODULE,
160 }, {
161 .name = "DCDC_REG4",
162 .supply_name = "vcc4",
163 .id = RK808_ID_DCDC4,
164 .ops = &rk808_reg_ops,
165 .type = REGULATOR_VOLTAGE,
166 .n_voltages = 16,
167 .linear_ranges = rk808_buck4_voltage_ranges,
168 .n_linear_ranges = ARRAY_SIZE(rk808_buck4_voltage_ranges),
169 .vsel_reg = RK808_BUCK4_ON_VSEL_REG,
170 .vsel_mask = RK808_BUCK4_VSEL_MASK,
171 .enable_reg = RK808_DCDC_EN_REG,
172 .enable_mask = BIT(3),
173 .owner = THIS_MODULE,
174 }, {
175 .name = "LDO_REG1",
176 .supply_name = "vcc6",
177 .id = RK808_ID_LDO1,
178 .ops = &rk808_reg_ops,
179 .type = REGULATOR_VOLTAGE,
180 .n_voltages = 17,
181 .linear_ranges = rk808_ldo_voltage_ranges,
182 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
183 .vsel_reg = RK808_LDO1_ON_VSEL_REG,
184 .vsel_mask = RK808_LDO_VSEL_MASK,
185 .enable_reg = RK808_LDO_EN_REG,
186 .enable_mask = BIT(0),
187 .enable_time = 400,
188 .owner = THIS_MODULE,
189 }, {
190 .name = "LDO_REG2",
191 .supply_name = "vcc6",
192 .id = RK808_ID_LDO2,
193 .ops = &rk808_reg_ops,
194 .type = REGULATOR_VOLTAGE,
195 .n_voltages = 17,
196 .linear_ranges = rk808_ldo_voltage_ranges,
197 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
198 .vsel_reg = RK808_LDO2_ON_VSEL_REG,
199 .vsel_mask = RK808_LDO_VSEL_MASK,
200 .enable_reg = RK808_LDO_EN_REG,
201 .enable_mask = BIT(1),
202 .enable_time = 400,
203 .owner = THIS_MODULE,
204 }, {
205 .name = "LDO_REG3",
206 .supply_name = "vcc7",
207 .id = RK808_ID_LDO3,
208 .ops = &rk808_reg_ops,
209 .type = REGULATOR_VOLTAGE,
210 .n_voltages = 16,
211 .linear_ranges = rk808_ldo3_voltage_ranges,
212 .n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
213 .vsel_reg = RK808_LDO3_ON_VSEL_REG,
214 .vsel_mask = RK808_BUCK4_VSEL_MASK,
215 .enable_reg = RK808_LDO_EN_REG,
216 .enable_mask = BIT(2),
217 .enable_time = 400,
218 .owner = THIS_MODULE,
219 }, {
220 .name = "LDO_REG4",
221 .supply_name = "vcc9",
222 .id = RK808_ID_LDO4,
223 .ops = &rk808_reg_ops,
224 .type = REGULATOR_VOLTAGE,
225 .n_voltages = 17,
226 .linear_ranges = rk808_ldo_voltage_ranges,
227 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
228 .vsel_reg = RK808_LDO4_ON_VSEL_REG,
229 .vsel_mask = RK808_LDO_VSEL_MASK,
230 .enable_reg = RK808_LDO_EN_REG,
231 .enable_mask = BIT(3),
232 .enable_time = 400,
233 .owner = THIS_MODULE,
234 }, {
235 .name = "LDO_REG5",
236 .supply_name = "vcc9",
237 .id = RK808_ID_LDO5,
238 .ops = &rk808_reg_ops,
239 .type = REGULATOR_VOLTAGE,
240 .n_voltages = 17,
241 .linear_ranges = rk808_ldo_voltage_ranges,
242 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
243 .vsel_reg = RK808_LDO5_ON_VSEL_REG,
244 .vsel_mask = RK808_LDO_VSEL_MASK,
245 .enable_reg = RK808_LDO_EN_REG,
246 .enable_mask = BIT(4),
247 .enable_time = 400,
248 .owner = THIS_MODULE,
249 }, {
250 .name = "LDO_REG6",
251 .supply_name = "vcc10",
252 .id = RK808_ID_LDO6,
253 .ops = &rk808_reg_ops,
254 .type = REGULATOR_VOLTAGE,
255 .n_voltages = 18,
256 .linear_ranges = rk808_ldo6_voltage_ranges,
257 .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
258 .vsel_reg = RK808_LDO6_ON_VSEL_REG,
259 .vsel_mask = RK808_LDO_VSEL_MASK,
260 .enable_reg = RK808_LDO_EN_REG,
261 .enable_mask = BIT(5),
262 .enable_time = 400,
263 .owner = THIS_MODULE,
264 }, {
265 .name = "LDO_REG7",
266 .supply_name = "vcc7",
267 .id = RK808_ID_LDO7,
268 .ops = &rk808_reg_ops,
269 .type = REGULATOR_VOLTAGE,
270 .n_voltages = 18,
271 .linear_ranges = rk808_ldo6_voltage_ranges,
272 .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
273 .vsel_reg = RK808_LDO7_ON_VSEL_REG,
274 .vsel_mask = RK808_LDO_VSEL_MASK,
275 .enable_reg = RK808_LDO_EN_REG,
276 .enable_mask = BIT(6),
277 .enable_time = 400,
278 .owner = THIS_MODULE,
279 }, {
280 .name = "LDO_REG8",
281 .supply_name = "vcc11",
282 .id = RK808_ID_LDO8,
283 .ops = &rk808_reg_ops,
284 .type = REGULATOR_VOLTAGE,
285 .n_voltages = 17,
286 .linear_ranges = rk808_ldo_voltage_ranges,
287 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
288 .vsel_reg = RK808_LDO8_ON_VSEL_REG,
289 .vsel_mask = RK808_LDO_VSEL_MASK,
290 .enable_reg = RK808_LDO_EN_REG,
291 .enable_mask = BIT(7),
292 .enable_time = 400,
293 .owner = THIS_MODULE,
294 }, {
295 .name = "SWITCH_REG1",
296 .supply_name = "vcc8",
297 .id = RK808_ID_SWITCH1,
298 .ops = &rk808_switch_ops,
299 .type = REGULATOR_VOLTAGE,
300 .enable_reg = RK808_DCDC_EN_REG,
301 .enable_mask = BIT(5),
302 .owner = THIS_MODULE,
303 }, {
304 .name = "SWITCH_REG2",
305 .supply_name = "vcc12",
306 .id = RK808_ID_SWITCH2,
307 .ops = &rk808_switch_ops,
308 .type = REGULATOR_VOLTAGE,
309 .enable_reg = RK808_DCDC_EN_REG,
310 .enable_mask = BIT(6),
311 .owner = THIS_MODULE,
312 },
313 };
314
315 static struct of_regulator_match rk808_reg_matches[] = {
316 [RK808_ID_DCDC1] = { .name = "DCDC_REG1" },
317 [RK808_ID_DCDC2] = { .name = "DCDC_REG2" },
318 [RK808_ID_DCDC3] = { .name = "DCDC_REG3" },
319 [RK808_ID_DCDC4] = { .name = "DCDC_REG4" },
320 [RK808_ID_LDO1] = { .name = "LDO_REG1" },
321 [RK808_ID_LDO2] = { .name = "LDO_REG2" },
322 [RK808_ID_LDO3] = { .name = "LDO_REG3" },
323 [RK808_ID_LDO4] = { .name = "LDO_REG4" },
324 [RK808_ID_LDO5] = { .name = "LDO_REG5" },
325 [RK808_ID_LDO6] = { .name = "LDO_REG6" },
326 [RK808_ID_LDO7] = { .name = "LDO_REG7" },
327 [RK808_ID_LDO8] = { .name = "LDO_REG8" },
328 [RK808_ID_SWITCH1] = { .name = "SWITCH_REG1" },
329 [RK808_ID_SWITCH2] = { .name = "SWITCH_REG2" },
330 };
331
rk808_regulator_probe(struct platform_device * pdev)332 static int rk808_regulator_probe(struct platform_device *pdev)
333 {
334 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
335 struct i2c_client *client = rk808->i2c;
336 struct device_node *reg_np;
337 struct regulator_config config = {};
338 struct regulator_dev *rk808_rdev;
339 int ret, i;
340
341 reg_np = of_get_child_by_name(client->dev.of_node, "regulators");
342 if (!reg_np)
343 return -ENXIO;
344
345 ret = of_regulator_match(&pdev->dev, reg_np, rk808_reg_matches,
346 RK808_NUM_REGULATORS);
347 of_node_put(reg_np);
348 if (ret < 0)
349 return ret;
350
351 /* Instantiate the regulators */
352 for (i = 0; i < RK808_NUM_REGULATORS; i++) {
353 if (!rk808_reg_matches[i].init_data ||
354 !rk808_reg_matches[i].of_node)
355 continue;
356
357 config.dev = &client->dev;
358 config.driver_data = rk808;
359 config.regmap = rk808->regmap;
360 config.of_node = rk808_reg_matches[i].of_node;
361 config.init_data = rk808_reg_matches[i].init_data;
362
363 rk808_rdev = devm_regulator_register(&pdev->dev,
364 &rk808_reg[i], &config);
365 if (IS_ERR(rk808_rdev)) {
366 dev_err(&client->dev,
367 "failed to register %d regulator\n", i);
368 return PTR_ERR(rk808_rdev);
369 }
370 }
371
372 return 0;
373 }
374
375 static struct platform_driver rk808_regulator_driver = {
376 .probe = rk808_regulator_probe,
377 .driver = {
378 .name = "rk808-regulator",
379 .owner = THIS_MODULE,
380 },
381 };
382
383 module_platform_driver(rk808_regulator_driver);
384
385 MODULE_DESCRIPTION("regulator driver for the rk808 series PMICs");
386 MODULE_AUTHOR("Chris Zhong<zyw@rock-chips.com>");
387 MODULE_AUTHOR("Zhang Qing<zhangqing@rock-chips.com>");
388 MODULE_LICENSE("GPL");
389 MODULE_ALIAS("platform:rk808-regulator");
390