1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2023 Analog Devices, Inc.
4 * ADI regulator driver for MAX77503.
5 */
6
7 #include <linux/i2c.h>
8 #include <linux/module.h>
9 #include <linux/regmap.h>
10 #include <linux/regulator/driver.h>
11 #include <linux/regulator/machine.h>
12 #include <linux/regulator/of_regulator.h>
13 #include <linux/util_macros.h>
14
15 #define MAX77503_REG_CFG 0x00
16 #define MAX77503_REG_VOUT 0x01
17
18 #define MAX77503_BIT_EN BIT(0)
19 #define MAX77503_BIT_CURR_LIM BIT(3)
20 #define MAX77503_BIT_ADEN BIT(6)
21
22 #define MAX77503_BITS_SOFT_START GENMASK(5, 4)
23 #define MAX77503_BITS_MX_VOUT GENMASK(7, 0)
24
25 #define MAX77503_AD_ENABLED 0x1
26 #define MAX77503_AD_DISABLED 0x0
27
28 static const struct regmap_config max77503_regmap_config = {
29 .reg_bits = 8,
30 .val_bits = 8,
31 .max_register = 0x2,
32 };
33
34 static const struct regulator_ops max77503_buck_ops = {
35 .list_voltage = regulator_list_voltage_linear_range,
36 .map_voltage = regulator_map_voltage_ascend,
37 .is_enabled = regulator_is_enabled_regmap,
38 .enable = regulator_enable_regmap,
39 .disable = regulator_disable_regmap,
40 .get_voltage_sel = regulator_get_voltage_sel_regmap,
41 .set_voltage_sel = regulator_set_voltage_sel_regmap,
42 .get_current_limit = regulator_get_current_limit_regmap,
43 .set_current_limit = regulator_set_current_limit_regmap,
44 .set_active_discharge = regulator_set_active_discharge_regmap,
45 .set_soft_start = regulator_set_soft_start_regmap,
46 };
47
48 static const struct linear_range max77503_buck_ranges[] = {
49 REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000)
50 };
51
52 static const unsigned int max77503_current_limit_table[] = {
53 500000, 2000000
54 };
55
56 static const struct regulator_desc max77503_regulators_desc = {
57 .name = "max77503",
58 .enable_reg = MAX77503_REG_CFG,
59 .enable_mask = MAX77503_BIT_EN,
60 .ops = &max77503_buck_ops,
61 .type = REGULATOR_VOLTAGE,
62 .linear_ranges = max77503_buck_ranges,
63 .n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges),
64 .vsel_reg = MAX77503_REG_VOUT,
65 .vsel_mask = MAX77503_BITS_MX_VOUT,
66 .soft_start_reg = MAX77503_REG_CFG,
67 .soft_start_mask = MAX77503_BITS_SOFT_START,
68 .active_discharge_reg = MAX77503_REG_CFG,
69 .active_discharge_mask = MAX77503_BIT_ADEN,
70 .active_discharge_off = MAX77503_AD_DISABLED,
71 .active_discharge_on = MAX77503_AD_ENABLED,
72 .csel_reg = MAX77503_REG_CFG,
73 .csel_mask = MAX77503_BIT_CURR_LIM,
74 .curr_table = max77503_current_limit_table,
75 .n_current_limits = ARRAY_SIZE(max77503_current_limit_table),
76 .owner = THIS_MODULE,
77 };
78
max77503_regulator_probe(struct i2c_client * client)79 static int max77503_regulator_probe(struct i2c_client *client)
80 {
81 struct device *dev = &client->dev;
82 struct regulator_config config = {};
83 struct regulator_dev *rdev;
84
85 config.dev = dev;
86 config.of_node = dev->of_node;
87 config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config);
88 if (IS_ERR(config.regmap)) {
89 dev_err(dev, "Failed to init regmap");
90 return PTR_ERR(config.regmap);
91 }
92
93 rdev = devm_regulator_register(dev, &max77503_regulators_desc, &config);
94 if (IS_ERR(rdev)) {
95 dev_err(dev, "Failed to register regulator MAX77503");
96 return PTR_ERR(rdev);
97 }
98
99 return 0;
100 }
101
102 static const struct of_device_id of_max77503_match_tbl[] = {
103 { .compatible = "adi,max77503", },
104 { }
105 };
106
107 MODULE_DEVICE_TABLE(of, of_max77503_match_tbl);
108
109 static const struct i2c_device_id max77503_regulator_id[] = {
110 {"max77503"},
111 { }
112 };
113
114 MODULE_DEVICE_TABLE(i2c, max77503_regulator_id);
115
116 static struct i2c_driver max77503_regulator_driver = {
117 .driver = {
118 .name = "max77503",
119 .of_match_table = of_max77503_match_tbl
120 },
121 .probe = max77503_regulator_probe,
122 .id_table = max77503_regulator_id,
123 };
124
125 module_i2c_driver(max77503_regulator_driver);
126
127 MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@analog.com>");
128 MODULE_DESCRIPTION("MAX77503 regulator driver");
129 MODULE_LICENSE("GPL");
130