2 * Regulator driver for mp8865
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 #include <linux/i2c.h>
15 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/driver.h>
19 #include <linux/regulator/of_regulator.h>
21 #define MP8865_MAX_VSEL 0x7f
22 #define VOL_MIN_IDX 0x00
23 #define VOL_MAX_IDX 0x7f
24 #define MP8865_ENABLE_TIME 150
26 /* Register definitions */
27 #define MP8865_VOUT_REG 0
28 #define MP8865_SYSCNTL_REG 1
29 #define MP8865_ID_REG 2
30 #define MP8865_STATUS_REG 3
31 #define MP8865_MAX_REG 4
33 #define MP8865_VOUT_MASK 0x7f
34 #define MP8865_VBOOT_MASK 0x80
36 #define MP8865_ENABLE 0x80
37 #define MP8865_GO_BIT 0x40
38 #define MP8865_SLEW_RATE_MASK 0x38
39 #define MP8865_SWITCH_FRE_MASK 0x06
40 #define MP8865_PFM_MODE 0X01
42 /* mp8865 chip information */
45 struct regulator_desc desc;
46 struct regulator_dev *rdev;
47 struct regmap *regmap;
50 struct mp8865_platform_data {
51 struct regulator_init_data *mp8865_init_data;
52 struct device_node *of_node;
55 static const struct regulator_linear_range mp8865_voltage_ranges[] = {
56 REGULATOR_LINEAR_RANGE(600000, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
59 static int mp8865_set_voltage(struct regulator_dev *rdev, unsigned sel)
63 ret = regmap_update_bits(rdev->regmap, MP8865_SYSCNTL_REG,
64 MP8865_GO_BIT, MP8865_GO_BIT);
68 sel <<= ffs(rdev->desc->vsel_mask) - 1;
69 return regmap_write(rdev->regmap, MP8865_VOUT_REG, sel);
72 static bool is_write_reg(struct device *dev, unsigned int reg)
74 return (reg < MP8865_ID_REG) ? true : false;
77 static bool is_volatile_reg(struct device *dev, unsigned int reg)
79 return (reg == MP8865_STATUS_REG) ? true : false;
82 static const struct regmap_config mp8865_regmap_config = {
85 .writeable_reg = is_write_reg,
86 .volatile_reg = is_volatile_reg,
87 .max_register = MP8865_MAX_REG,
88 .cache_type = REGCACHE_RBTREE,
91 static struct regulator_ops mp8865_dcdc_ops = {
92 .list_voltage = regulator_list_voltage_linear_range,
93 .map_voltage = regulator_map_voltage_linear_range,
94 .get_voltage_sel = regulator_get_voltage_sel_regmap,
95 .set_voltage_sel = mp8865_set_voltage,
96 .enable = regulator_enable_regmap,
97 .disable = regulator_disable_regmap,
98 .is_enabled = regulator_is_enabled_regmap,
101 static const struct of_device_id mp8865_of_match[] = {
102 {.compatible = "mps,mp8865", .data = (void *)0},
105 MODULE_DEVICE_TABLE(of, mp8865_of_match);
107 static struct of_regulator_match mp8865_matches = {
108 .name = "mp8865_dcdc1",
109 .driver_data = (void *)0,
112 static struct mp8865_platform_data *
113 mp8865_parse_dt(struct i2c_client *client,
114 struct of_regulator_match **mp8865_reg_matches)
116 struct mp8865_platform_data *pdata;
117 struct device_node *np, *regulators;
120 pdata = devm_kzalloc(&client->dev, sizeof(struct mp8865_platform_data),
125 np = of_node_get(client->dev.of_node);
126 regulators = of_find_node_by_name(np, "regulators");
128 dev_err(&client->dev, "regulator node not found\n");
132 ret = of_regulator_match(&client->dev, regulators, &mp8865_matches, 1);
134 dev_err(&client->dev, "Error parsing regulators init data\n");
137 *mp8865_reg_matches = &mp8865_matches;
138 of_node_put(regulators);
140 pdata->mp8865_init_data = mp8865_matches.init_data;
141 pdata->of_node = mp8865_matches.of_node;
146 static int mp8865_probe(struct i2c_client *client,
147 const struct i2c_device_id *id)
149 struct mp8865_chip *mp8865;
150 struct mp8865_platform_data *pdata;
151 struct of_regulator_match *mp8865_reg_matches = NULL;
152 struct regulator_dev *sy_rdev;
153 struct regulator_config config;
154 struct regulator_desc *rdesc;
157 mp8865 = devm_kzalloc(&client->dev, sizeof(struct mp8865_chip),
161 pdata = dev_get_platdata(&client->dev);
163 pdata = mp8865_parse_dt(client, &mp8865_reg_matches);
165 if (!pdata || !pdata->mp8865_init_data) {
166 dev_err(&client->dev, "Platform data not found!\n");
170 mp8865->dev = &client->dev;
171 mp8865->regmap = devm_regmap_init_i2c(client, &mp8865_regmap_config);
172 if (IS_ERR(mp8865->regmap)) {
173 dev_err(&client->dev, "Failed to allocate regmap!\n");
174 return PTR_ERR(mp8865->regmap);
177 i2c_set_clientdata(client, mp8865);
179 config.dev = mp8865->dev;
180 config.driver_data = mp8865;
181 config.init_data = pdata->mp8865_init_data;
182 config.of_node = pdata->of_node;
183 config.regmap = mp8865->regmap;
185 rdesc = &mp8865->desc;
186 rdesc->name = "mp8865_dcdc1",
188 rdesc->ops = &mp8865_dcdc_ops,
189 rdesc->n_voltages = MP8865_MAX_VSEL + 1,
190 rdesc->linear_ranges = mp8865_voltage_ranges,
191 rdesc->n_linear_ranges = ARRAY_SIZE(mp8865_voltage_ranges),
192 rdesc->vsel_reg = MP8865_VOUT_REG;
193 rdesc->vsel_mask = MP8865_VOUT_MASK;
194 rdesc->enable_reg = MP8865_SYSCNTL_REG;
195 rdesc->enable_mask = MP8865_ENABLE;
196 rdesc->enable_time = MP8865_ENABLE_TIME;
197 rdesc->type = REGULATOR_VOLTAGE,
198 rdesc->owner = THIS_MODULE;
200 /* set slew_rate 16mV/uS */
201 ret = regmap_update_bits(mp8865->regmap, MP8865_SYSCNTL_REG,
202 MP8865_SLEW_RATE_MASK, 0x10);
204 dev_err(mp8865->dev, "failed to set slew_rate\n");
208 /* set switch_frequency 1.1MHz */
209 ret = regmap_update_bits(mp8865->regmap, MP8865_SYSCNTL_REG,
210 MP8865_SWITCH_FRE_MASK, 0x40);
212 dev_err(mp8865->dev, "failed to set switch_frequency\n");
216 sy_rdev = devm_regulator_register(mp8865->dev, &mp8865->desc,
218 if (IS_ERR(sy_rdev)) {
219 dev_err(mp8865->dev, "failed to register regulator\n");
220 return PTR_ERR(sy_rdev);
223 dev_info(mp8865->dev, "mp8865 register successful\n");
228 static const struct i2c_device_id mp8865_id[] = {
229 { .name = "mps,mp8865", },
232 MODULE_DEVICE_TABLE(i2c, mp8865_id);
234 static struct i2c_driver mp8865_driver = {
237 .of_match_table = of_match_ptr(mp8865_of_match),
238 .owner = THIS_MODULE,
240 .probe = mp8865_probe,
241 .id_table = mp8865_id,
243 module_i2c_driver(mp8865_driver);
245 MODULE_AUTHOR("Zain Wang <zain.wang@rock-chips.com>");
246 MODULE_DESCRIPTION("mp8865 voltage regulator driver");
247 MODULE_LICENSE("GPL v2");