xref: /openbmc/linux/drivers/regulator/isl9305.c (revision 964e1865)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * isl9305 - Intersil ISL9305 DCDC regulator
4  *
5  * Copyright 2014 Linaro Ltd
6  *
7  * Author: Mark Brown <broonie@kernel.org>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/i2c.h>
13 #include <linux/of.h>
14 #include <linux/platform_data/isl9305.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/slab.h>
19 
20 /*
21  * Registers
22  */
23 #define ISL9305_DCD1OUT          0x0
24 #define ISL9305_DCD2OUT          0x1
25 #define ISL9305_LDO1OUT          0x2
26 #define ISL9305_LDO2OUT          0x3
27 #define ISL9305_DCD_PARAMETER    0x4
28 #define ISL9305_SYSTEM_PARAMETER 0x5
29 #define ISL9305_DCD_SRCTL        0x6
30 
31 #define ISL9305_MAX_REG ISL9305_DCD_SRCTL
32 
33 /*
34  * DCD_PARAMETER
35  */
36 #define ISL9305_DCD_PHASE   0x40
37 #define ISL9305_DCD2_ULTRA  0x20
38 #define ISL9305_DCD1_ULTRA  0x10
39 #define ISL9305_DCD2_BLD    0x08
40 #define ISL9305_DCD1_BLD    0x04
41 #define ISL9305_DCD2_MODE   0x02
42 #define ISL9305_DCD1_MODE   0x01
43 
44 /*
45  * SYSTEM_PARAMETER
46  */
47 #define ISL9305_I2C_EN      0x40
48 #define ISL9305_DCDPOR_MASK 0x30
49 #define ISL9305_LDO2_EN     0x08
50 #define ISL9305_LDO1_EN     0x04
51 #define ISL9305_DCD2_EN     0x02
52 #define ISL9305_DCD1_EN     0x01
53 
54 /*
55  * DCD_SRCTL
56  */
57 #define ISL9305_DCD2SR_MASK 0xc0
58 #define ISL9305_DCD1SR_MASK 0x07
59 
60 static const struct regulator_ops isl9305_ops = {
61 	.enable = regulator_enable_regmap,
62 	.disable = regulator_disable_regmap,
63 	.is_enabled = regulator_is_enabled_regmap,
64 	.list_voltage = regulator_list_voltage_linear,
65 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
66 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
67 };
68 
69 static const struct regulator_desc isl9305_regulators[] = {
70 	[ISL9305_DCD1] = {
71 		.name =		"DCD1",
72 		.of_match =	of_match_ptr("dcd1"),
73 		.regulators_node = of_match_ptr("regulators"),
74 		.n_voltages =	0x70,
75 		.min_uV =	825000,
76 		.uV_step =	25000,
77 		.vsel_reg =	ISL9305_DCD1OUT,
78 		.vsel_mask =	0x7f,
79 		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
80 		.enable_mask =	ISL9305_DCD1_EN,
81 		.supply_name =	"VINDCD1",
82 		.ops =		&isl9305_ops,
83 		.owner =	THIS_MODULE,
84 	},
85 	[ISL9305_DCD2] = {
86 		.name =		"DCD2",
87 		.of_match =	of_match_ptr("dcd2"),
88 		.regulators_node = of_match_ptr("regulators"),
89 		.n_voltages =	0x70,
90 		.min_uV =	825000,
91 		.uV_step =	25000,
92 		.vsel_reg =	ISL9305_DCD2OUT,
93 		.vsel_mask =	0x7f,
94 		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
95 		.enable_mask =	ISL9305_DCD2_EN,
96 		.supply_name =	"VINDCD2",
97 		.ops =		&isl9305_ops,
98 		.owner =	THIS_MODULE,
99 	},
100 	[ISL9305_LDO1] = {
101 		.name =		"LDO1",
102 		.of_match =	of_match_ptr("ldo1"),
103 		.regulators_node = of_match_ptr("regulators"),
104 		.n_voltages =	0x37,
105 		.min_uV =	900000,
106 		.uV_step =	50000,
107 		.vsel_reg =	ISL9305_LDO1OUT,
108 		.vsel_mask =	0x3f,
109 		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
110 		.enable_mask =	ISL9305_LDO1_EN,
111 		.supply_name =	"VINLDO1",
112 		.ops =		&isl9305_ops,
113 		.owner =	THIS_MODULE,
114 	},
115 	[ISL9305_LDO2] = {
116 		.name =		"LDO2",
117 		.of_match =	of_match_ptr("ldo2"),
118 		.regulators_node = of_match_ptr("regulators"),
119 		.n_voltages =	0x37,
120 		.min_uV =	900000,
121 		.uV_step =	50000,
122 		.vsel_reg =	ISL9305_LDO2OUT,
123 		.vsel_mask =	0x3f,
124 		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
125 		.enable_mask =	ISL9305_LDO2_EN,
126 		.supply_name =	"VINLDO2",
127 		.ops =		&isl9305_ops,
128 		.owner =	THIS_MODULE,
129 	},
130 };
131 
132 static const struct regmap_config isl9305_regmap = {
133 	.reg_bits = 8,
134 	.val_bits = 8,
135 
136 	.max_register = ISL9305_MAX_REG,
137 	.cache_type = REGCACHE_RBTREE,
138 };
139 
isl9305_i2c_probe(struct i2c_client * i2c)140 static int isl9305_i2c_probe(struct i2c_client *i2c)
141 {
142 	struct regulator_config config = { };
143 	struct isl9305_pdata *pdata = i2c->dev.platform_data;
144 	struct regulator_dev *rdev;
145 	struct regmap *regmap;
146 	int i, ret;
147 
148 	regmap = devm_regmap_init_i2c(i2c, &isl9305_regmap);
149 	if (IS_ERR(regmap)) {
150 		ret = PTR_ERR(regmap);
151 		dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
152 		return ret;
153 	}
154 
155 	config.dev = &i2c->dev;
156 
157 	for (i = 0; i < ARRAY_SIZE(isl9305_regulators); i++) {
158 		if (pdata)
159 			config.init_data = pdata->init_data[i];
160 		else
161 			config.init_data = NULL;
162 
163 		rdev = devm_regulator_register(&i2c->dev,
164 					       &isl9305_regulators[i],
165 					       &config);
166 		if (IS_ERR(rdev)) {
167 			ret = PTR_ERR(rdev);
168 			dev_err(&i2c->dev, "Failed to register %s: %d\n",
169 				isl9305_regulators[i].name, ret);
170 			return ret;
171 		}
172 	}
173 
174 	return 0;
175 }
176 
177 #ifdef CONFIG_OF
178 static const struct of_device_id isl9305_dt_ids[] = {
179 	{ .compatible = "isl,isl9305" }, /* for backward compat., don't use */
180 	{ .compatible = "isil,isl9305" },
181 	{ .compatible = "isl,isl9305h" }, /* for backward compat., don't use */
182 	{ .compatible = "isil,isl9305h" },
183 	{},
184 };
185 MODULE_DEVICE_TABLE(of, isl9305_dt_ids);
186 #endif
187 
188 static const struct i2c_device_id isl9305_i2c_id[] = {
189 	{ "isl9305", },
190 	{ "isl9305h", },
191 	{ }
192 };
193 MODULE_DEVICE_TABLE(i2c, isl9305_i2c_id);
194 
195 static struct i2c_driver isl9305_regulator_driver = {
196 	.driver = {
197 		.name = "isl9305",
198 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
199 		.of_match_table	= of_match_ptr(isl9305_dt_ids),
200 	},
201 	.probe = isl9305_i2c_probe,
202 	.id_table = isl9305_i2c_id,
203 };
204 
205 module_i2c_driver(isl9305_regulator_driver);
206 
207 MODULE_AUTHOR("Mark Brown");
208 MODULE_DESCRIPTION("Intersil ISL9305 DCDC regulator");
209 MODULE_LICENSE("GPL");
210