1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/module.h>
3 #include <linux/i2c.h>
4 #include <linux/of.h>
5 #include <linux/regulator/driver.h>
6 #include <linux/regmap.h>
7 
8 static const struct regulator_ops pg86x_ops = {
9 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
10 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
11 	.list_voltage = regulator_list_voltage_linear_range,
12 };
13 
14 static const struct linear_range pg86x_buck1_ranges[] = {
15 	REGULATOR_LINEAR_RANGE(      0,  0, 10,     0),
16 	REGULATOR_LINEAR_RANGE(1000000, 11, 34, 25000),
17 	REGULATOR_LINEAR_RANGE(1600000, 35, 47, 50000),
18 };
19 
20 static const struct linear_range pg86x_buck2_ranges[] = {
21 	REGULATOR_LINEAR_RANGE(      0,  0, 15,     0),
22 	REGULATOR_LINEAR_RANGE(1000000, 16, 39, 25000),
23 	REGULATOR_LINEAR_RANGE(1600000, 40, 52, 50000),
24 };
25 
26 static const struct regulator_desc pg86x_regulators[] = {
27 	{
28 		.id = 0,
29 		.type = REGULATOR_VOLTAGE,
30 		.name = "buck1",
31 		.of_match = of_match_ptr("buck1"),
32 		.n_voltages = 11 + 24 + 13,
33 		.linear_ranges = pg86x_buck1_ranges,
34 		.n_linear_ranges = 3,
35 		.vsel_reg  = 0x24,
36 		.vsel_mask = 0xff,
37 		.ops = &pg86x_ops,
38 		.owner = THIS_MODULE
39 	},
40 	{
41 		.id = 1,
42 		.type = REGULATOR_VOLTAGE,
43 		.name = "buck2",
44 		.of_match = of_match_ptr("buck2"),
45 		.n_voltages = 16 + 24 + 13,
46 		.linear_ranges = pg86x_buck2_ranges,
47 		.n_linear_ranges = 3,
48 		.vsel_reg  = 0x13,
49 		.vsel_mask = 0xff,
50 		.ops = &pg86x_ops,
51 		.owner = THIS_MODULE
52 	},
53 };
54 
55 static const struct regmap_config pg86x_regmap = {
56 	.reg_bits = 8,
57 	.val_bits = 8,
58 };
59 
pg86x_i2c_probe(struct i2c_client * i2c)60 static int pg86x_i2c_probe(struct i2c_client *i2c)
61 {
62 	int id, ret;
63 	struct regulator_config config = {.dev = &i2c->dev};
64 	struct regmap *regmap = devm_regmap_init_i2c(i2c, &pg86x_regmap);
65 
66 	if (IS_ERR(regmap)) {
67 		ret = PTR_ERR(regmap);
68 		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
69 		return ret;
70 	}
71 
72 	for (id = 0; id < ARRAY_SIZE(pg86x_regulators); id++) {
73 		struct regulator_dev *rdev;
74 		rdev = devm_regulator_register(&i2c->dev,
75 					       &pg86x_regulators[id],
76 					       &config);
77 		if (IS_ERR(rdev)) {
78 			ret = PTR_ERR(rdev);
79 			dev_err(&i2c->dev, "failed to register %s: %d\n",
80 				pg86x_regulators[id].name, ret);
81 			return ret;
82 		}
83 	}
84 	return 0;
85 }
86 
87 static const struct of_device_id __maybe_unused pg86x_dt_ids[] = {
88 	{ .compatible = "marvell,88pg867" },
89 	{ .compatible = "marvell,88pg868" },
90 	{ }
91 };
92 MODULE_DEVICE_TABLE(of, pg86x_dt_ids);
93 
94 static const struct i2c_device_id pg86x_i2c_id[] = {
95 	{ "88pg867", },
96 	{ "88pg868", },
97 	{ }
98 };
99 MODULE_DEVICE_TABLE(i2c, pg86x_i2c_id);
100 
101 static struct i2c_driver pg86x_regulator_driver = {
102 	.driver = {
103 		.name = "88pg86x",
104 		.of_match_table = of_match_ptr(pg86x_dt_ids),
105 	},
106 	.probe_new = pg86x_i2c_probe,
107 	.id_table = pg86x_i2c_id,
108 };
109 
110 module_i2c_driver(pg86x_regulator_driver);
111 
112 MODULE_DESCRIPTION("Marvell 88PG86X voltage regulator");
113 MODULE_AUTHOR("Alexander Monakov <amonakov@gmail.com>");
114 MODULE_LICENSE("GPL");
115