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 | struct max77503_dev { |
29 | struct device *dev; |
30 | struct device_node *of_node; |
31 | struct regulator_desc desc; |
32 | struct regulator_dev *rdev; |
33 | struct regmap *regmap; |
34 | }; |
35 | |
36 | static const struct regmap_config max77503_regmap_config = { |
37 | .reg_bits = 8, |
38 | .val_bits = 8, |
39 | .max_register = 0x2, |
40 | }; |
41 | |
42 | static const struct regulator_ops max77503_buck_ops = { |
43 | .list_voltage = regulator_list_voltage_linear_range, |
44 | .map_voltage = regulator_map_voltage_ascend, |
45 | .is_enabled = regulator_is_enabled_regmap, |
46 | .enable = regulator_enable_regmap, |
47 | .disable = regulator_disable_regmap, |
48 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
49 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
50 | .get_current_limit = regulator_get_current_limit_regmap, |
51 | .set_current_limit = regulator_set_current_limit_regmap, |
52 | .set_active_discharge = regulator_set_active_discharge_regmap, |
53 | .set_soft_start = regulator_set_soft_start_regmap, |
54 | }; |
55 | |
56 | static const struct linear_range max77503_buck_ranges[] = { |
57 | REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000) |
58 | }; |
59 | |
60 | static const unsigned int max77503_current_limit_table[] = { |
61 | 500000, 2000000 |
62 | }; |
63 | |
64 | static const struct regulator_desc max77503_regulators_desc = { |
65 | .name = "max77503" , |
66 | .enable_reg = MAX77503_REG_CFG, |
67 | .enable_mask = MAX77503_BIT_EN, |
68 | .ops = &max77503_buck_ops, |
69 | .type = REGULATOR_VOLTAGE, |
70 | .linear_ranges = max77503_buck_ranges, |
71 | .n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges), |
72 | .vsel_reg = MAX77503_REG_VOUT, |
73 | .vsel_mask = MAX77503_BITS_MX_VOUT, |
74 | .soft_start_reg = MAX77503_REG_CFG, |
75 | .soft_start_mask = MAX77503_BITS_SOFT_START, |
76 | .active_discharge_reg = MAX77503_REG_CFG, |
77 | .active_discharge_mask = MAX77503_BIT_ADEN, |
78 | .active_discharge_off = MAX77503_AD_DISABLED, |
79 | .active_discharge_on = MAX77503_AD_ENABLED, |
80 | .csel_reg = MAX77503_REG_CFG, |
81 | .csel_mask = MAX77503_BIT_CURR_LIM, |
82 | .curr_table = max77503_current_limit_table, |
83 | .n_current_limits = ARRAY_SIZE(max77503_current_limit_table), |
84 | .owner = THIS_MODULE, |
85 | }; |
86 | |
87 | static int max77503_regulator_probe(struct i2c_client *client) |
88 | { |
89 | struct device *dev = &client->dev; |
90 | struct regulator_config config = {}; |
91 | struct regulator_dev *rdev; |
92 | |
93 | config.dev = dev; |
94 | config.of_node = dev->of_node; |
95 | config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config); |
96 | if (IS_ERR(ptr: config.regmap)) { |
97 | dev_err(dev, "Failed to init regmap" ); |
98 | return PTR_ERR(ptr: config.regmap); |
99 | } |
100 | |
101 | rdev = devm_regulator_register(dev, regulator_desc: &max77503_regulators_desc, config: &config); |
102 | if (IS_ERR(ptr: rdev)) { |
103 | dev_err(dev, "Failed to register regulator MAX77503" ); |
104 | return PTR_ERR(ptr: rdev); |
105 | } |
106 | |
107 | return 0; |
108 | } |
109 | |
110 | static const struct of_device_id of_max77503_match_tbl[] = { |
111 | { .compatible = "adi,max77503" , }, |
112 | { } |
113 | }; |
114 | |
115 | MODULE_DEVICE_TABLE(of, of_max77503_match_tbl); |
116 | |
117 | static const struct i2c_device_id max77503_regulator_id[] = { |
118 | {"max77503" }, |
119 | { } |
120 | }; |
121 | |
122 | MODULE_DEVICE_TABLE(i2c, max77503_regulator_id); |
123 | |
124 | static struct i2c_driver max77503_regulator_driver = { |
125 | .driver = { |
126 | .name = "max77503" , |
127 | .of_match_table = of_max77503_match_tbl |
128 | }, |
129 | .probe = max77503_regulator_probe, |
130 | .id_table = max77503_regulator_id, |
131 | }; |
132 | |
133 | module_i2c_driver(max77503_regulator_driver); |
134 | |
135 | MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@analog.com>" ); |
136 | MODULE_DESCRIPTION("MAX77503 regulator driver" ); |
137 | MODULE_LICENSE("GPL" ); |
138 | |