1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Regulator driver for the Richtek RT5033
4  *
5  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
6  * Author: Beomho Seo <beomho.seo@samsung.com>
7  */
8 
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/regulator/driver.h>
12 #include <linux/mfd/rt5033.h>
13 #include <linux/mfd/rt5033-private.h>
14 #include <linux/regulator/of_regulator.h>
15 
16 static const struct linear_range rt5033_buck_ranges[] = {
17 	REGULATOR_LINEAR_RANGE(1000000, 0, 20, 100000),
18 	REGULATOR_LINEAR_RANGE(3000000, 21, 31, 0),
19 };
20 
21 static const struct linear_range rt5033_ldo_ranges[] = {
22 	REGULATOR_LINEAR_RANGE(1200000, 0, 18, 100000),
23 	REGULATOR_LINEAR_RANGE(3000000, 19, 31, 0),
24 };
25 
26 static const struct regulator_ops rt5033_safe_ldo_ops = {
27 	.is_enabled		= regulator_is_enabled_regmap,
28 	.enable			= regulator_enable_regmap,
29 	.disable		= regulator_disable_regmap,
30 	.list_voltage		= regulator_list_voltage_linear,
31 };
32 
33 static const struct regulator_ops rt5033_buck_ops = {
34 	.is_enabled		= regulator_is_enabled_regmap,
35 	.enable			= regulator_enable_regmap,
36 	.disable		= regulator_disable_regmap,
37 	.list_voltage		= regulator_list_voltage_linear_range,
38 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
39 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
40 };
41 
42 static const struct regulator_desc rt5033_supported_regulators[] = {
43 	[RT5033_BUCK] = {
44 		.name		= "BUCK",
45 		.of_match	= of_match_ptr("BUCK"),
46 		.regulators_node = of_match_ptr("regulators"),
47 		.id		= RT5033_BUCK,
48 		.ops		= &rt5033_buck_ops,
49 		.type		= REGULATOR_VOLTAGE,
50 		.owner		= THIS_MODULE,
51 		.n_voltages	= RT5033_REGULATOR_BUCK_VOLTAGE_STEP_NUM,
52 		.linear_ranges	= rt5033_buck_ranges,
53 		.n_linear_ranges = ARRAY_SIZE(rt5033_buck_ranges),
54 		.enable_reg	= RT5033_REG_CTRL,
55 		.enable_mask	= RT5033_CTRL_EN_BUCK_MASK,
56 		.vsel_reg	= RT5033_REG_BUCK_CTRL,
57 		.vsel_mask	= RT5033_BUCK_CTRL_MASK,
58 	},
59 	[RT5033_LDO] = {
60 		.name		= "LDO",
61 		.of_match	= of_match_ptr("LDO"),
62 		.regulators_node = of_match_ptr("regulators"),
63 		.id		= RT5033_LDO,
64 		.ops		= &rt5033_buck_ops,
65 		.type		= REGULATOR_VOLTAGE,
66 		.owner		= THIS_MODULE,
67 		.n_voltages	= RT5033_REGULATOR_LDO_VOLTAGE_STEP_NUM,
68 		.linear_ranges	= rt5033_ldo_ranges,
69 		.n_linear_ranges = ARRAY_SIZE(rt5033_ldo_ranges),
70 		.enable_reg	= RT5033_REG_CTRL,
71 		.enable_mask	= RT5033_CTRL_EN_LDO_MASK,
72 		.vsel_reg	= RT5033_REG_LDO_CTRL,
73 		.vsel_mask	= RT5033_LDO_CTRL_MASK,
74 	},
75 	[RT5033_SAFE_LDO] = {
76 		.name		= "SAFE_LDO",
77 		.of_match	= of_match_ptr("SAFE_LDO"),
78 		.regulators_node = of_match_ptr("regulators"),
79 		.id		= RT5033_SAFE_LDO,
80 		.ops		= &rt5033_safe_ldo_ops,
81 		.type		= REGULATOR_VOLTAGE,
82 		.owner		= THIS_MODULE,
83 		.n_voltages	= 1,
84 		.min_uV		= RT5033_REGULATOR_SAFE_LDO_VOLTAGE,
85 		.enable_reg	= RT5033_REG_CTRL,
86 		.enable_mask	= RT5033_CTRL_EN_SAFE_LDO_MASK,
87 	},
88 };
89 
90 static int rt5033_regulator_probe(struct platform_device *pdev)
91 {
92 	struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
93 	int ret, i;
94 	struct regulator_config config = {};
95 
96 	config.dev = rt5033->dev;
97 	config.driver_data = rt5033;
98 
99 	for (i = 0; i < ARRAY_SIZE(rt5033_supported_regulators); i++) {
100 		struct regulator_dev *regulator;
101 
102 		config.regmap = rt5033->regmap;
103 
104 		regulator = devm_regulator_register(&pdev->dev,
105 				&rt5033_supported_regulators[i], &config);
106 		if (IS_ERR(regulator)) {
107 			ret = PTR_ERR(regulator);
108 			dev_err(&pdev->dev,
109 				"Regulator init failed %d: with error: %d\n",
110 				i, ret);
111 			return ret;
112 		}
113 	}
114 
115 	return 0;
116 }
117 
118 static const struct platform_device_id rt5033_regulator_id[] = {
119 	{ "rt5033-regulator", },
120 	{ }
121 };
122 MODULE_DEVICE_TABLE(platform, rt5033_regulator_id);
123 
124 static struct platform_driver rt5033_regulator_driver = {
125 	.driver = {
126 		.name = "rt5033-regulator",
127 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
128 	},
129 	.probe		= rt5033_regulator_probe,
130 	.id_table	= rt5033_regulator_id,
131 };
132 module_platform_driver(rt5033_regulator_driver);
133 
134 MODULE_DESCRIPTION("Richtek RT5033 Regulator driver");
135 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
136 MODULE_LICENSE("GPL");
137