1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2022 Analog Devices, Inc.
4  * ADI Regulator driver for the MAX77540 and MAX77541
5  */
6 
7 #include <linux/mfd/max77541.h>
8 #include <linux/mod_devicetable.h>
9 #include <linux/platform_device.h>
10 #include <linux/regmap.h>
11 #include <linux/regulator/driver.h>
12 
13 static const struct regulator_ops max77541_buck_ops = {
14 	.enable			= regulator_enable_regmap,
15 	.disable		= regulator_disable_regmap,
16 	.is_enabled		= regulator_is_enabled_regmap,
17 	.list_voltage		= regulator_list_voltage_pickable_linear_range,
18 	.get_voltage_sel	= regulator_get_voltage_sel_pickable_regmap,
19 	.set_voltage_sel	= regulator_set_voltage_sel_pickable_regmap,
20 };
21 
22 static const struct linear_range max77540_buck_ranges[] = {
23 	/* Ranges when VOLT_SEL bits are 0x00 */
24 	REGULATOR_LINEAR_RANGE(500000, 0x00, 0x8B, 5000),
25 	REGULATOR_LINEAR_RANGE(1200000, 0x8C, 0xFF, 0),
26 	/* Ranges when VOLT_SEL bits are 0x40 */
27 	REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
28 	REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
29 	/* Ranges when VOLT_SEL bits are  0x80 */
30 	REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
31 	REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
32 };
33 
34 static const struct linear_range max77541_buck_ranges[] = {
35 	/* Ranges when VOLT_SEL bits are 0x00 */
36 	REGULATOR_LINEAR_RANGE(300000, 0x00, 0xB3, 5000),
37 	REGULATOR_LINEAR_RANGE(1200000, 0xB4, 0xFF, 0),
38 	/* Ranges when VOLT_SEL bits are 0x40 */
39 	REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
40 	REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
41 	/* Ranges when VOLT_SEL bits are  0x80 */
42 	REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
43 	REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
44 };
45 
46 static const unsigned int max77541_buck_volt_range_sel[] = {
47 	0x00, 0x00, 0x40, 0x40, 0x80, 0x80,
48 };
49 
50 enum max77541_regulators {
51 	MAX77541_BUCK1 = 1,
52 	MAX77541_BUCK2,
53 };
54 
55 #define MAX77540_BUCK(_id, _ops)					\
56 	{	.id = MAX77541_BUCK ## _id,				\
57 		.name = "buck"#_id,					\
58 		.of_match = "buck"#_id,					\
59 		.regulators_node = "regulators",			\
60 		.enable_reg = MAX77541_REG_EN_CTRL,			\
61 		.enable_mask = MAX77541_BIT_M ## _id ## _EN,		\
62 		.ops = &(_ops),						\
63 		.type = REGULATOR_VOLTAGE,				\
64 		.linear_ranges = max77540_buck_ranges,			\
65 		.n_linear_ranges = ARRAY_SIZE(max77540_buck_ranges),	\
66 		.vsel_reg = MAX77541_REG_M ## _id ## _VOUT,		\
67 		.vsel_mask = MAX77541_BITS_MX_VOUT,			\
68 		.vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1,	\
69 		.vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG,		\
70 		.linear_range_selectors = max77541_buck_volt_range_sel, \
71 		.owner = THIS_MODULE,					\
72 	}
73 
74 #define MAX77541_BUCK(_id, _ops)					\
75 	{	.id = MAX77541_BUCK ## _id,				\
76 		.name = "buck"#_id,					\
77 		.of_match = "buck"#_id,					\
78 		.regulators_node = "regulators",			\
79 		.enable_reg = MAX77541_REG_EN_CTRL,			\
80 		.enable_mask = MAX77541_BIT_M ## _id ## _EN,		\
81 		.ops = &(_ops),						\
82 		.type = REGULATOR_VOLTAGE,				\
83 		.linear_ranges = max77541_buck_ranges,			\
84 		.n_linear_ranges = ARRAY_SIZE(max77541_buck_ranges),	\
85 		.vsel_reg = MAX77541_REG_M ## _id ## _VOUT,		\
86 		.vsel_mask = MAX77541_BITS_MX_VOUT,			\
87 		.vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1,	\
88 		.vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG,		\
89 		.linear_range_selectors = max77541_buck_volt_range_sel, \
90 		.owner = THIS_MODULE,					\
91 	}
92 
93 static const struct regulator_desc max77540_regulators_desc[] = {
94 	MAX77540_BUCK(1, max77541_buck_ops),
95 	MAX77540_BUCK(2, max77541_buck_ops),
96 };
97 
98 static const struct regulator_desc max77541_regulators_desc[] = {
99 	MAX77541_BUCK(1, max77541_buck_ops),
100 	MAX77541_BUCK(2, max77541_buck_ops),
101 };
102 
103 static int max77541_regulator_probe(struct platform_device *pdev)
104 {
105 	struct regulator_config config = {};
106 	const struct regulator_desc *desc;
107 	struct device *dev = &pdev->dev;
108 	struct regulator_dev *rdev;
109 	struct max77541 *max77541 = dev_get_drvdata(dev->parent);
110 	unsigned int i;
111 
112 	config.dev = dev->parent;
113 
114 	switch (max77541->id) {
115 	case MAX77540:
116 		desc = max77540_regulators_desc;
117 		break;
118 	case MAX77541:
119 		desc = max77541_regulators_desc;
120 		break;
121 	default:
122 		return -EINVAL;
123 	}
124 
125 	for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
126 		rdev = devm_regulator_register(dev, &desc[i], &config);
127 		if (IS_ERR(rdev))
128 			return dev_err_probe(dev, PTR_ERR(rdev),
129 					     "Failed to register regulator\n");
130 	}
131 
132 	return 0;
133 }
134 
135 static const struct platform_device_id max77541_regulator_platform_id[] = {
136 	{ "max77540-regulator" },
137 	{ "max77541-regulator" },
138 	{ }
139 };
140 MODULE_DEVICE_TABLE(platform, max77541_regulator_platform_id);
141 
142 static struct platform_driver max77541_regulator_driver = {
143 	.driver = {
144 		.name = "max77541-regulator",
145 	},
146 	.probe = max77541_regulator_probe,
147 	.id_table = max77541_regulator_platform_id,
148 };
149 module_platform_driver(max77541_regulator_driver);
150 
151 MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
152 MODULE_DESCRIPTION("MAX77540/MAX77541 regulator driver");
153 MODULE_LICENSE("GPL");
154