1// SPDX-License-Identifier: GPL-2.0
2/*
3 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7 */
8
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/mfd/as3711.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/of_regulator.h>
18#include <linux/slab.h>
19
20struct as3711_regulator_info {
21 struct regulator_desc desc;
22};
23
24struct as3711_regulator {
25 struct as3711_regulator_info *reg_info;
26};
27
28/*
29 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
30 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
31 * FAST: sdX_fast=1
32 * NORMAL: low_noise=1
33 * IDLE: low_noise=0
34 */
35
36static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
37{
38 unsigned int fast_bit = rdev->desc->enable_mask,
39 low_noise_bit = fast_bit << 4;
40 u8 val;
41
42 switch (mode) {
43 case REGULATOR_MODE_FAST:
44 val = fast_bit | low_noise_bit;
45 break;
46 case REGULATOR_MODE_NORMAL:
47 val = low_noise_bit;
48 break;
49 case REGULATOR_MODE_IDLE:
50 val = 0;
51 break;
52 default:
53 return -EINVAL;
54 }
55
56 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
57 low_noise_bit | fast_bit, val);
58}
59
60static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
61{
62 unsigned int fast_bit = rdev->desc->enable_mask,
63 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
64 unsigned int val;
65 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
66
67 if (ret < 0)
68 return ret;
69
70 if ((val & mask) == mask)
71 return REGULATOR_MODE_FAST;
72
73 if ((val & mask) == low_noise_bit)
74 return REGULATOR_MODE_NORMAL;
75
76 if (!(val & mask))
77 return REGULATOR_MODE_IDLE;
78
79 return -EINVAL;
80}
81
82static const struct regulator_ops as3711_sd_ops = {
83 .is_enabled = regulator_is_enabled_regmap,
84 .enable = regulator_enable_regmap,
85 .disable = regulator_disable_regmap,
86 .get_voltage_sel = regulator_get_voltage_sel_regmap,
87 .set_voltage_sel = regulator_set_voltage_sel_regmap,
88 .list_voltage = regulator_list_voltage_linear_range,
89 .map_voltage = regulator_map_voltage_linear_range,
90 .get_mode = as3711_get_mode_sd,
91 .set_mode = as3711_set_mode_sd,
92};
93
94static const struct regulator_ops as3711_aldo_ops = {
95 .is_enabled = regulator_is_enabled_regmap,
96 .enable = regulator_enable_regmap,
97 .disable = regulator_disable_regmap,
98 .get_voltage_sel = regulator_get_voltage_sel_regmap,
99 .set_voltage_sel = regulator_set_voltage_sel_regmap,
100 .list_voltage = regulator_list_voltage_linear_range,
101 .map_voltage = regulator_map_voltage_linear_range,
102};
103
104static const struct regulator_ops as3711_dldo_ops = {
105 .is_enabled = regulator_is_enabled_regmap,
106 .enable = regulator_enable_regmap,
107 .disable = regulator_disable_regmap,
108 .get_voltage_sel = regulator_get_voltage_sel_regmap,
109 .set_voltage_sel = regulator_set_voltage_sel_regmap,
110 .list_voltage = regulator_list_voltage_linear_range,
111 .map_voltage = regulator_map_voltage_linear_range,
112};
113
114static const struct regulator_linear_range as3711_sd_ranges[] = {
115 REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
116 REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
117 REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
118};
119
120static const struct regulator_linear_range as3711_aldo_ranges[] = {
121 REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
122 REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
123};
124
125static const struct regulator_linear_range as3711_dldo_ranges[] = {
126 REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
127 REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
128};
129
130#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \
131 [AS3711_REGULATOR_ ## _id] = { \
132 .desc = { \
133 .name = "as3711-regulator-" # _id, \
134 .id = AS3711_REGULATOR_ ## _id, \
135 .n_voltages = (_vmask + 1), \
136 .ops = &as3711_ ## _sfx ## _ops, \
137 .type = REGULATOR_VOLTAGE, \
138 .owner = THIS_MODULE, \
139 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
140 .vsel_mask = _vmask, \
141 .enable_reg = AS3711_ ## _en_reg, \
142 .enable_mask = BIT(_en_bit), \
143 .linear_ranges = as3711_ ## _sfx ## _ranges, \
144 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
145 }, \
146}
147
148static struct as3711_regulator_info as3711_reg_info[] = {
149 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
150 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
151 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
152 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
153 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
154 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
155 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
156 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
157 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
158 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
159 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
160 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
161 /* StepUp output voltage depends on supplying regulator */
162};
163
164#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
165
166static struct of_regulator_match
167as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
168 [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
169 [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
170 [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
171 [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
172 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
173 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
174 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
175 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
176 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
177 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
178 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
179 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
180};
181
182static int as3711_regulator_parse_dt(struct device *dev,
183 struct device_node **of_node, const int count)
184{
185 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
186 struct device_node *regulators =
187 of_get_child_by_name(dev->parent->of_node, "regulators");
188 struct of_regulator_match *match;
189 int ret, i;
190
191 if (!regulators) {
192 dev_err(dev, "regulator node not found\n");
193 return -ENODEV;
194 }
195
196 ret = of_regulator_match(dev->parent, regulators,
197 as3711_regulator_matches, count);
198 of_node_put(regulators);
199 if (ret < 0) {
200 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
201 return ret;
202 }
203
204 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
205 if (match->of_node) {
206 pdata->init_data[i] = match->init_data;
207 of_node[i] = match->of_node;
208 }
209
210 return 0;
211}
212
213static int as3711_regulator_probe(struct platform_device *pdev)
214{
215 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
216 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
217 struct regulator_config config = {.dev = &pdev->dev,};
218 struct as3711_regulator *reg = NULL;
219 struct as3711_regulator *regs;
220 struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
221 struct regulator_dev *rdev;
222 struct as3711_regulator_info *ri;
223 int ret;
224 int id;
225
226 if (!pdata) {
227 dev_err(&pdev->dev, "No platform data...\n");
228 return -ENODEV;
229 }
230
231 if (pdev->dev.parent->of_node) {
232 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
233 if (ret < 0) {
234 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
235 return ret;
236 }
237 }
238
239 regs = devm_kcalloc(&pdev->dev,
240 AS3711_REGULATOR_NUM,
241 sizeof(struct as3711_regulator),
242 GFP_KERNEL);
243 if (!regs)
244 return -ENOMEM;
245
246 for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
247 reg = &regs[id];
248 reg->reg_info = ri;
249
250 config.init_data = pdata->init_data[id];
251 config.driver_data = reg;
252 config.regmap = as3711->regmap;
253 config.of_node = of_node[id];
254
255 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
256 if (IS_ERR(rdev)) {
257 dev_err(&pdev->dev, "Failed to register regulator %s\n",
258 ri->desc.name);
259 return PTR_ERR(rdev);
260 }
261 }
262 platform_set_drvdata(pdev, regs);
263 return 0;
264}
265
266static struct platform_driver as3711_regulator_driver = {
267 .driver = {
268 .name = "as3711-regulator",
269 },
270 .probe = as3711_regulator_probe,
271};
272
273static int __init as3711_regulator_init(void)
274{
275 return platform_driver_register(&as3711_regulator_driver);
276}
277subsys_initcall(as3711_regulator_init);
278
279static void __exit as3711_regulator_exit(void)
280{
281 platform_driver_unregister(&as3711_regulator_driver);
282}
283module_exit(as3711_regulator_exit);
284
285MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
286MODULE_DESCRIPTION("AS3711 regulator driver");
287MODULE_ALIAS("platform:as3711-regulator");
288MODULE_LICENSE("GPL v2");
289