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_device.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 
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 
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 
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 = of_match_ptr("SW"),
88 	.owner = THIS_MODULE,
89 	.ops = &tps6286x_regulator_ops,
90 	.of_map_mode = tps6286x_of_map_mode,
91 	.regulators_node = of_match_ptr("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 
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", 0 },
140 	{ "tps62866", 0 },
141 	{ "tps62868", 0 },
142 	{ "tps62869", 0 },
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 = of_match_ptr(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_LICENSE("GPL v2");
160