1ef4de050SKuninori Morimoto // SPDX-License-Identifier: GPL-2.0
2f1e64f90SGuennadi Liakhovetski /*
3f1e64f90SGuennadi Liakhovetski * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
4f1e64f90SGuennadi Liakhovetski *
5f1e64f90SGuennadi Liakhovetski * Copyright (C) 2012 Renesas Electronics Corporation
6f1e64f90SGuennadi Liakhovetski * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7f1e64f90SGuennadi Liakhovetski */
8f1e64f90SGuennadi Liakhovetski
9f1e64f90SGuennadi Liakhovetski #include <linux/err.h>
10f1e64f90SGuennadi Liakhovetski #include <linux/init.h>
11f1e64f90SGuennadi Liakhovetski #include <linux/mfd/as3711.h>
12f1e64f90SGuennadi Liakhovetski #include <linux/module.h>
13416d6759SGuennadi Liakhovetski #include <linux/of.h>
14f1e64f90SGuennadi Liakhovetski #include <linux/platform_device.h>
15f1e64f90SGuennadi Liakhovetski #include <linux/regmap.h>
16f1e64f90SGuennadi Liakhovetski #include <linux/regulator/driver.h>
17416d6759SGuennadi Liakhovetski #include <linux/regulator/of_regulator.h>
18f1e64f90SGuennadi Liakhovetski #include <linux/slab.h>
19f1e64f90SGuennadi Liakhovetski
20f1e64f90SGuennadi Liakhovetski /*
21f1e64f90SGuennadi Liakhovetski * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
22f1e64f90SGuennadi Liakhovetski * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
23f1e64f90SGuennadi Liakhovetski * FAST: sdX_fast=1
24f1e64f90SGuennadi Liakhovetski * NORMAL: low_noise=1
25f1e64f90SGuennadi Liakhovetski * IDLE: low_noise=0
26f1e64f90SGuennadi Liakhovetski */
27f1e64f90SGuennadi Liakhovetski
as3711_set_mode_sd(struct regulator_dev * rdev,unsigned int mode)28f1e64f90SGuennadi Liakhovetski static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
29f1e64f90SGuennadi Liakhovetski {
30f1e64f90SGuennadi Liakhovetski unsigned int fast_bit = rdev->desc->enable_mask,
31f1e64f90SGuennadi Liakhovetski low_noise_bit = fast_bit << 4;
32f1e64f90SGuennadi Liakhovetski u8 val;
33f1e64f90SGuennadi Liakhovetski
34f1e64f90SGuennadi Liakhovetski switch (mode) {
35f1e64f90SGuennadi Liakhovetski case REGULATOR_MODE_FAST:
36f1e64f90SGuennadi Liakhovetski val = fast_bit | low_noise_bit;
37f1e64f90SGuennadi Liakhovetski break;
38f1e64f90SGuennadi Liakhovetski case REGULATOR_MODE_NORMAL:
39f1e64f90SGuennadi Liakhovetski val = low_noise_bit;
40f1e64f90SGuennadi Liakhovetski break;
41f1e64f90SGuennadi Liakhovetski case REGULATOR_MODE_IDLE:
42f1e64f90SGuennadi Liakhovetski val = 0;
43f1e64f90SGuennadi Liakhovetski break;
44f1e64f90SGuennadi Liakhovetski default:
45f1e64f90SGuennadi Liakhovetski return -EINVAL;
46f1e64f90SGuennadi Liakhovetski }
47f1e64f90SGuennadi Liakhovetski
48f1e64f90SGuennadi Liakhovetski return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
49f1e64f90SGuennadi Liakhovetski low_noise_bit | fast_bit, val);
50f1e64f90SGuennadi Liakhovetski }
51f1e64f90SGuennadi Liakhovetski
as3711_get_mode_sd(struct regulator_dev * rdev)52f1e64f90SGuennadi Liakhovetski static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
53f1e64f90SGuennadi Liakhovetski {
54f1e64f90SGuennadi Liakhovetski unsigned int fast_bit = rdev->desc->enable_mask,
55f1e64f90SGuennadi Liakhovetski low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
56f1e64f90SGuennadi Liakhovetski unsigned int val;
57f1e64f90SGuennadi Liakhovetski int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
58f1e64f90SGuennadi Liakhovetski
59f1e64f90SGuennadi Liakhovetski if (ret < 0)
60f1e64f90SGuennadi Liakhovetski return ret;
61f1e64f90SGuennadi Liakhovetski
62f1e64f90SGuennadi Liakhovetski if ((val & mask) == mask)
63f1e64f90SGuennadi Liakhovetski return REGULATOR_MODE_FAST;
64f1e64f90SGuennadi Liakhovetski
65f1e64f90SGuennadi Liakhovetski if ((val & mask) == low_noise_bit)
66f1e64f90SGuennadi Liakhovetski return REGULATOR_MODE_NORMAL;
67f1e64f90SGuennadi Liakhovetski
68f1e64f90SGuennadi Liakhovetski if (!(val & mask))
69f1e64f90SGuennadi Liakhovetski return REGULATOR_MODE_IDLE;
70f1e64f90SGuennadi Liakhovetski
71f1e64f90SGuennadi Liakhovetski return -EINVAL;
72f1e64f90SGuennadi Liakhovetski }
73f1e64f90SGuennadi Liakhovetski
741bacf463SBhumika Goyal static const struct regulator_ops as3711_sd_ops = {
75f1e64f90SGuennadi Liakhovetski .is_enabled = regulator_is_enabled_regmap,
76f1e64f90SGuennadi Liakhovetski .enable = regulator_enable_regmap,
77f1e64f90SGuennadi Liakhovetski .disable = regulator_disable_regmap,
78f1e64f90SGuennadi Liakhovetski .get_voltage_sel = regulator_get_voltage_sel_regmap,
79f1e64f90SGuennadi Liakhovetski .set_voltage_sel = regulator_set_voltage_sel_regmap,
809234c636SAxel Lin .list_voltage = regulator_list_voltage_linear_range,
819234c636SAxel Lin .map_voltage = regulator_map_voltage_linear_range,
82f1e64f90SGuennadi Liakhovetski .get_mode = as3711_get_mode_sd,
83f1e64f90SGuennadi Liakhovetski .set_mode = as3711_set_mode_sd,
84f1e64f90SGuennadi Liakhovetski };
85f1e64f90SGuennadi Liakhovetski
861bacf463SBhumika Goyal static const struct regulator_ops as3711_aldo_ops = {
87f1e64f90SGuennadi Liakhovetski .is_enabled = regulator_is_enabled_regmap,
88f1e64f90SGuennadi Liakhovetski .enable = regulator_enable_regmap,
89f1e64f90SGuennadi Liakhovetski .disable = regulator_disable_regmap,
90f1e64f90SGuennadi Liakhovetski .get_voltage_sel = regulator_get_voltage_sel_regmap,
91f1e64f90SGuennadi Liakhovetski .set_voltage_sel = regulator_set_voltage_sel_regmap,
929234c636SAxel Lin .list_voltage = regulator_list_voltage_linear_range,
939234c636SAxel Lin .map_voltage = regulator_map_voltage_linear_range,
94f1e64f90SGuennadi Liakhovetski };
95f1e64f90SGuennadi Liakhovetski
961bacf463SBhumika Goyal static const struct regulator_ops as3711_dldo_ops = {
97f1e64f90SGuennadi Liakhovetski .is_enabled = regulator_is_enabled_regmap,
98f1e64f90SGuennadi Liakhovetski .enable = regulator_enable_regmap,
99f1e64f90SGuennadi Liakhovetski .disable = regulator_disable_regmap,
100f1e64f90SGuennadi Liakhovetski .get_voltage_sel = regulator_get_voltage_sel_regmap,
101f1e64f90SGuennadi Liakhovetski .set_voltage_sel = regulator_set_voltage_sel_regmap,
1029234c636SAxel Lin .list_voltage = regulator_list_voltage_linear_range,
1039234c636SAxel Lin .map_voltage = regulator_map_voltage_linear_range,
1049234c636SAxel Lin };
1059234c636SAxel Lin
10660ab7f41SMatti Vaittinen static const struct linear_range as3711_sd_ranges[] = {
1078828bae4SAxel Lin REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
1088828bae4SAxel Lin REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
1098828bae4SAxel Lin REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
1109234c636SAxel Lin };
1119234c636SAxel Lin
11260ab7f41SMatti Vaittinen static const struct linear_range as3711_aldo_ranges[] = {
1138828bae4SAxel Lin REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
1148828bae4SAxel Lin REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
1159234c636SAxel Lin };
1169234c636SAxel Lin
11760ab7f41SMatti Vaittinen static const struct linear_range as3711_dldo_ranges[] = {
1188828bae4SAxel Lin REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
1198828bae4SAxel Lin REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
120f1e64f90SGuennadi Liakhovetski };
121f1e64f90SGuennadi Liakhovetski
122192264e0SAxel Lin #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \
123f1e64f90SGuennadi Liakhovetski [AS3711_REGULATOR_ ## _id] = { \
124f1e64f90SGuennadi Liakhovetski .name = "as3711-regulator-" # _id, \
125f1e64f90SGuennadi Liakhovetski .id = AS3711_REGULATOR_ ## _id, \
126f1e64f90SGuennadi Liakhovetski .n_voltages = (_vmask + 1), \
127f1e64f90SGuennadi Liakhovetski .ops = &as3711_ ## _sfx ## _ops, \
128f1e64f90SGuennadi Liakhovetski .type = REGULATOR_VOLTAGE, \
129f1e64f90SGuennadi Liakhovetski .owner = THIS_MODULE, \
130f1e64f90SGuennadi Liakhovetski .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
131192264e0SAxel Lin .vsel_mask = _vmask, \
132f1e64f90SGuennadi Liakhovetski .enable_reg = AS3711_ ## _en_reg, \
133f1e64f90SGuennadi Liakhovetski .enable_mask = BIT(_en_bit), \
1349234c636SAxel Lin .linear_ranges = as3711_ ## _sfx ## _ranges, \
1359234c636SAxel Lin .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
136f1e64f90SGuennadi Liakhovetski }
137f1e64f90SGuennadi Liakhovetski
138f668a1dbSAxel Lin static const struct regulator_desc as3711_reg_desc[] = {
139192264e0SAxel Lin AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
140192264e0SAxel Lin AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
141192264e0SAxel Lin AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
142192264e0SAxel Lin AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
143192264e0SAxel Lin AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
144192264e0SAxel Lin AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
145192264e0SAxel Lin AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
146192264e0SAxel Lin AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
147192264e0SAxel Lin AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
148192264e0SAxel Lin AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
149192264e0SAxel Lin AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
150192264e0SAxel Lin AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
151f1e64f90SGuennadi Liakhovetski /* StepUp output voltage depends on supplying regulator */
152f1e64f90SGuennadi Liakhovetski };
153f1e64f90SGuennadi Liakhovetski
154f668a1dbSAxel Lin #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_desc)
155f1e64f90SGuennadi Liakhovetski
156d6c7d731SAxel Lin static struct of_regulator_match
157d6c7d731SAxel Lin as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
158d6c7d731SAxel Lin [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
159d6c7d731SAxel Lin [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
160d6c7d731SAxel Lin [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
161d6c7d731SAxel Lin [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
162d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
163d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
164d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
165d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
166d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
167d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
168d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
169d6c7d731SAxel Lin [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
170416d6759SGuennadi Liakhovetski };
171416d6759SGuennadi Liakhovetski
as3711_regulator_parse_dt(struct device * dev,struct device_node ** of_node,const int count)172416d6759SGuennadi Liakhovetski static int as3711_regulator_parse_dt(struct device *dev,
173416d6759SGuennadi Liakhovetski struct device_node **of_node, const int count)
174416d6759SGuennadi Liakhovetski {
175416d6759SGuennadi Liakhovetski struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
176416d6759SGuennadi Liakhovetski struct device_node *regulators =
177eecb02c0SSachin Kamat of_get_child_by_name(dev->parent->of_node, "regulators");
178d6c7d731SAxel Lin struct of_regulator_match *match;
179416d6759SGuennadi Liakhovetski int ret, i;
180416d6759SGuennadi Liakhovetski
181416d6759SGuennadi Liakhovetski if (!regulators) {
182416d6759SGuennadi Liakhovetski dev_err(dev, "regulator node not found\n");
183416d6759SGuennadi Liakhovetski return -ENODEV;
184416d6759SGuennadi Liakhovetski }
185416d6759SGuennadi Liakhovetski
186d6c7d731SAxel Lin ret = of_regulator_match(dev->parent, regulators,
187d6c7d731SAxel Lin as3711_regulator_matches, count);
188416d6759SGuennadi Liakhovetski of_node_put(regulators);
189416d6759SGuennadi Liakhovetski if (ret < 0) {
190416d6759SGuennadi Liakhovetski dev_err(dev, "Error parsing regulator init data: %d\n", ret);
191416d6759SGuennadi Liakhovetski return ret;
192416d6759SGuennadi Liakhovetski }
193416d6759SGuennadi Liakhovetski
194d6c7d731SAxel Lin for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
195416d6759SGuennadi Liakhovetski if (match->of_node) {
196416d6759SGuennadi Liakhovetski pdata->init_data[i] = match->init_data;
197416d6759SGuennadi Liakhovetski of_node[i] = match->of_node;
198416d6759SGuennadi Liakhovetski }
199416d6759SGuennadi Liakhovetski
200416d6759SGuennadi Liakhovetski return 0;
201416d6759SGuennadi Liakhovetski }
202416d6759SGuennadi Liakhovetski
as3711_regulator_probe(struct platform_device * pdev)203f1e64f90SGuennadi Liakhovetski static int as3711_regulator_probe(struct platform_device *pdev)
204f1e64f90SGuennadi Liakhovetski {
205f1e64f90SGuennadi Liakhovetski struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
206f1e64f90SGuennadi Liakhovetski struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
207f1e64f90SGuennadi Liakhovetski struct regulator_config config = {.dev = &pdev->dev,};
208416d6759SGuennadi Liakhovetski struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
209f1e64f90SGuennadi Liakhovetski struct regulator_dev *rdev;
210f1e64f90SGuennadi Liakhovetski int ret;
211f1e64f90SGuennadi Liakhovetski int id;
212f1e64f90SGuennadi Liakhovetski
213416d6759SGuennadi Liakhovetski if (!pdata) {
214416d6759SGuennadi Liakhovetski dev_err(&pdev->dev, "No platform data...\n");
215416d6759SGuennadi Liakhovetski return -ENODEV;
216416d6759SGuennadi Liakhovetski }
217416d6759SGuennadi Liakhovetski
218416d6759SGuennadi Liakhovetski if (pdev->dev.parent->of_node) {
219416d6759SGuennadi Liakhovetski ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
220416d6759SGuennadi Liakhovetski if (ret < 0) {
221416d6759SGuennadi Liakhovetski dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
222416d6759SGuennadi Liakhovetski return ret;
223416d6759SGuennadi Liakhovetski }
224416d6759SGuennadi Liakhovetski }
225f1e64f90SGuennadi Liakhovetski
226f668a1dbSAxel Lin for (id = 0; id < AS3711_REGULATOR_NUM; id++) {
227f7e9e52fSAxel Lin config.init_data = pdata->init_data[id];
228f1e64f90SGuennadi Liakhovetski config.regmap = as3711->regmap;
229416d6759SGuennadi Liakhovetski config.of_node = of_node[id];
230f1e64f90SGuennadi Liakhovetski
231f668a1dbSAxel Lin rdev = devm_regulator_register(&pdev->dev, &as3711_reg_desc[id],
232f668a1dbSAxel Lin &config);
233f1e64f90SGuennadi Liakhovetski if (IS_ERR(rdev)) {
234f1e64f90SGuennadi Liakhovetski dev_err(&pdev->dev, "Failed to register regulator %s\n",
235f668a1dbSAxel Lin as3711_reg_desc[id].name);
23627447c93SAxel Lin return PTR_ERR(rdev);
237f1e64f90SGuennadi Liakhovetski }
238f1e64f90SGuennadi Liakhovetski }
239f668a1dbSAxel Lin
240f1e64f90SGuennadi Liakhovetski return 0;
241f1e64f90SGuennadi Liakhovetski }
242f1e64f90SGuennadi Liakhovetski
243f1e64f90SGuennadi Liakhovetski static struct platform_driver as3711_regulator_driver = {
244f1e64f90SGuennadi Liakhovetski .driver = {
245f1e64f90SGuennadi Liakhovetski .name = "as3711-regulator",
246*259b93b2SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
247f1e64f90SGuennadi Liakhovetski },
248f1e64f90SGuennadi Liakhovetski .probe = as3711_regulator_probe,
249f1e64f90SGuennadi Liakhovetski };
250f1e64f90SGuennadi Liakhovetski
as3711_regulator_init(void)251f1e64f90SGuennadi Liakhovetski static int __init as3711_regulator_init(void)
252f1e64f90SGuennadi Liakhovetski {
253f1e64f90SGuennadi Liakhovetski return platform_driver_register(&as3711_regulator_driver);
254f1e64f90SGuennadi Liakhovetski }
255f1e64f90SGuennadi Liakhovetski subsys_initcall(as3711_regulator_init);
256f1e64f90SGuennadi Liakhovetski
as3711_regulator_exit(void)257f1e64f90SGuennadi Liakhovetski static void __exit as3711_regulator_exit(void)
258f1e64f90SGuennadi Liakhovetski {
259f1e64f90SGuennadi Liakhovetski platform_driver_unregister(&as3711_regulator_driver);
260f1e64f90SGuennadi Liakhovetski }
261f1e64f90SGuennadi Liakhovetski module_exit(as3711_regulator_exit);
262f1e64f90SGuennadi Liakhovetski
263f1e64f90SGuennadi Liakhovetski MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
264f1e64f90SGuennadi Liakhovetski MODULE_DESCRIPTION("AS3711 regulator driver");
265f1e64f90SGuennadi Liakhovetski MODULE_ALIAS("platform:as3711-regulator");
266f1e64f90SGuennadi Liakhovetski MODULE_LICENSE("GPL v2");
267