1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright Axis Communications AB
3
4 #include <linux/err.h>
5 #include <linux/i2c.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/regmap.h>
9 #include <linux/regulator/of_regulator.h>
10 #include <linux/regulator/machine.h>
11 #include <linux/regulator/driver.h>
12
13 #include <dt-bindings/regulator/ti,tps62864.h>
14
15 #define TPS6286X_VOUT1 0x01
16 #define TPS6286X_VOUT1_VO1_SET GENMASK(7, 0)
17
18 #define TPS6286X_CONTROL 0x03
19 #define TPS6286X_CONTROL_FPWM BIT(4)
20 #define TPS6286X_CONTROL_SWEN BIT(5)
21
22 #define TPS6286X_MIN_MV 400
23 #define TPS6286X_MAX_MV 1675
24 #define TPS6286X_STEP_MV 5
25
26 static const struct regmap_config tps6286x_regmap_config = {
27 .reg_bits = 8,
28 .val_bits = 8,
29 };
30
tps6286x_set_mode(struct regulator_dev * rdev,unsigned int mode)31 static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
32 {
33 unsigned int val;
34
35 switch (mode) {
36 case REGULATOR_MODE_NORMAL:
37 val = 0;
38 break;
39 case REGULATOR_MODE_FAST:
40 val = TPS6286X_CONTROL_FPWM;
41 break;
42 default:
43 return -EINVAL;
44 }
45
46 return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
47 TPS6286X_CONTROL_FPWM, val);
48 }
49
tps6286x_get_mode(struct regulator_dev * rdev)50 static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
51 {
52 unsigned int val;
53 int ret;
54
55 ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
56 if (ret < 0)
57 return 0;
58
59 return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
60 }
61
62 static const struct regulator_ops tps6286x_regulator_ops = {
63 .enable = regulator_enable_regmap,
64 .disable = regulator_disable_regmap,
65 .set_mode = tps6286x_set_mode,
66 .get_mode = tps6286x_get_mode,
67 .is_enabled = regulator_is_enabled_regmap,
68 .set_voltage_sel = regulator_set_voltage_sel_regmap,
69 .get_voltage_sel = regulator_get_voltage_sel_regmap,
70 .list_voltage = regulator_list_voltage_linear,
71 };
72
tps6286x_of_map_mode(unsigned int mode)73 static unsigned int tps6286x_of_map_mode(unsigned int mode)
74 {
75 switch (mode) {
76 case TPS62864_MODE_NORMAL:
77 return REGULATOR_MODE_NORMAL;
78 case TPS62864_MODE_FPWM:
79 return REGULATOR_MODE_FAST;
80 default:
81 return REGULATOR_MODE_INVALID;
82 }
83 }
84
85 static const struct regulator_desc tps6286x_reg = {
86 .name = "tps6286x",
87 .of_match = "SW",
88 .owner = THIS_MODULE,
89 .ops = &tps6286x_regulator_ops,
90 .of_map_mode = tps6286x_of_map_mode,
91 .regulators_node = "regulators",
92 .type = REGULATOR_VOLTAGE,
93 .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
94 .min_uV = TPS6286X_MIN_MV * 1000,
95 .uV_step = TPS6286X_STEP_MV * 1000,
96 .vsel_reg = TPS6286X_VOUT1,
97 .vsel_mask = TPS6286X_VOUT1_VO1_SET,
98 .enable_reg = TPS6286X_CONTROL,
99 .enable_mask = TPS6286X_CONTROL_SWEN,
100 .ramp_delay = 1000,
101 /* tDelay + tRamp, rounded up */
102 .enable_time = 3000,
103 };
104
105 static const struct of_device_id tps6286x_dt_ids[] = {
106 { .compatible = "ti,tps62864", },
107 { .compatible = "ti,tps62866", },
108 { .compatible = "ti,tps62868", },
109 { .compatible = "ti,tps62869", },
110 { }
111 };
112 MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
113
tps6286x_i2c_probe(struct i2c_client * i2c)114 static int tps6286x_i2c_probe(struct i2c_client *i2c)
115 {
116 struct device *dev = &i2c->dev;
117 struct regulator_config config = {};
118 struct regulator_dev *rdev;
119 struct regmap *regmap;
120
121 regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
122 if (IS_ERR(regmap))
123 return PTR_ERR(regmap);
124
125 config.dev = &i2c->dev;
126 config.of_node = dev->of_node;
127 config.regmap = regmap;
128
129 rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
130 if (IS_ERR(rdev)) {
131 dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
132 return PTR_ERR(rdev);
133 }
134
135 return 0;
136 }
137
138 static const struct i2c_device_id tps6286x_i2c_id[] = {
139 { "tps62864" },
140 { "tps62866" },
141 { "tps62868" },
142 { "tps62869" },
143 {}
144 };
145 MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
146
147 static struct i2c_driver tps6286x_regulator_driver = {
148 .driver = {
149 .name = "tps6286x",
150 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
151 .of_match_table = tps6286x_dt_ids,
152 },
153 .probe = tps6286x_i2c_probe,
154 .id_table = tps6286x_i2c_id,
155 };
156
157 module_i2c_driver(tps6286x_regulator_driver);
158
159 MODULE_DESCRIPTION("TI TPS6286x Power Regulator driver");
160 MODULE_LICENSE("GPL v2");
161