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_STATUS 0x05
23
24 #define TPS6286X_MIN_MV 400
25 #define TPS6286X_MAX_MV 1675
26 #define TPS6286X_STEP_MV 5
27
tps6286x_volatile_reg(struct device * dev,unsigned int reg)28 static bool tps6286x_volatile_reg(struct device *dev, unsigned int reg)
29 {
30 return reg == TPS6286X_STATUS;
31 }
32
33 static const struct regmap_config tps6286x_regmap_config = {
34 .reg_bits = 8,
35 .val_bits = 8,
36 .cache_type = REGCACHE_MAPLE,
37 .volatile_reg = tps6286x_volatile_reg,
38 };
39
tps6286x_set_mode(struct regulator_dev * rdev,unsigned int mode)40 static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
41 {
42 unsigned int val;
43
44 switch (mode) {
45 case REGULATOR_MODE_NORMAL:
46 val = 0;
47 break;
48 case REGULATOR_MODE_FAST:
49 val = TPS6286X_CONTROL_FPWM;
50 break;
51 default:
52 return -EINVAL;
53 }
54
55 return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
56 TPS6286X_CONTROL_FPWM, val);
57 }
58
tps6286x_get_mode(struct regulator_dev * rdev)59 static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
60 {
61 unsigned int val;
62 int ret;
63
64 ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
65 if (ret < 0)
66 return 0;
67
68 return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
69 }
70
71 static const struct regulator_ops tps6286x_regulator_ops = {
72 .enable = regulator_enable_regmap,
73 .disable = regulator_disable_regmap,
74 .set_mode = tps6286x_set_mode,
75 .get_mode = tps6286x_get_mode,
76 .is_enabled = regulator_is_enabled_regmap,
77 .set_voltage_sel = regulator_set_voltage_sel_regmap,
78 .get_voltage_sel = regulator_get_voltage_sel_regmap,
79 .list_voltage = regulator_list_voltage_linear,
80 };
81
tps6286x_of_map_mode(unsigned int mode)82 static unsigned int tps6286x_of_map_mode(unsigned int mode)
83 {
84 switch (mode) {
85 case TPS62864_MODE_NORMAL:
86 return REGULATOR_MODE_NORMAL;
87 case TPS62864_MODE_FPWM:
88 return REGULATOR_MODE_FAST;
89 default:
90 return REGULATOR_MODE_INVALID;
91 }
92 }
93
94 static const struct regulator_desc tps6286x_reg = {
95 .name = "tps6286x",
96 .of_match = "SW",
97 .owner = THIS_MODULE,
98 .ops = &tps6286x_regulator_ops,
99 .of_map_mode = tps6286x_of_map_mode,
100 .regulators_node = "regulators",
101 .type = REGULATOR_VOLTAGE,
102 .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
103 .min_uV = TPS6286X_MIN_MV * 1000,
104 .uV_step = TPS6286X_STEP_MV * 1000,
105 .vsel_reg = TPS6286X_VOUT1,
106 .vsel_mask = TPS6286X_VOUT1_VO1_SET,
107 .enable_reg = TPS6286X_CONTROL,
108 .enable_mask = TPS6286X_CONTROL_SWEN,
109 .ramp_delay = 1000,
110 /* tDelay + tRamp, rounded up */
111 .enable_time = 3000,
112 };
113
114 static const struct of_device_id tps6286x_dt_ids[] = {
115 { .compatible = "ti,tps62864", },
116 { .compatible = "ti,tps62866", },
117 { .compatible = "ti,tps62868", },
118 { .compatible = "ti,tps62869", },
119 { }
120 };
121 MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
122
tps6286x_i2c_probe(struct i2c_client * i2c)123 static int tps6286x_i2c_probe(struct i2c_client *i2c)
124 {
125 struct device *dev = &i2c->dev;
126 struct regulator_config config = {};
127 struct regulator_dev *rdev;
128 struct regmap *regmap;
129
130 regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
131 if (IS_ERR(regmap))
132 return PTR_ERR(regmap);
133
134 config.dev = &i2c->dev;
135 config.of_node = dev->of_node;
136 config.regmap = regmap;
137
138 rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
139 if (IS_ERR(rdev)) {
140 dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
141 return PTR_ERR(rdev);
142 }
143
144 return 0;
145 }
146
147 static const struct i2c_device_id tps6286x_i2c_id[] = {
148 { "tps62864" },
149 { "tps62866" },
150 { "tps62868" },
151 { "tps62869" },
152 {}
153 };
154 MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
155
156 static struct i2c_driver tps6286x_regulator_driver = {
157 .driver = {
158 .name = "tps6286x",
159 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
160 .of_match_table = tps6286x_dt_ids,
161 },
162 .probe = tps6286x_i2c_probe,
163 .id_table = tps6286x_i2c_id,
164 };
165
166 module_i2c_driver(tps6286x_regulator_driver);
167
168 MODULE_DESCRIPTION("TI TPS6286x Power Regulator driver");
169 MODULE_LICENSE("GPL v2");
170