xref: /openbmc/linux/drivers/regulator/mp5416.c (revision 045a44d4)
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // mp5416.c  - regulator driver for mps mp5416
4 //
5 // Copyright 2020 Monolithic Power Systems, Inc
6 //
7 // Author: Saravanan Sekar <sravanhome@gmail.com>
8 
9 #include <linux/err.h>
10 #include <linux/i2c.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/driver.h>
17 
18 #define MP5416_REG_CTL0			0x00
19 #define MP5416_REG_CTL1			0x01
20 #define MP5416_REG_CTL2			0x02
21 #define MP5416_REG_ILIM			0x03
22 #define MP5416_REG_BUCK1		0x04
23 #define MP5416_REG_BUCK2		0x05
24 #define MP5416_REG_BUCK3		0x06
25 #define MP5416_REG_BUCK4		0x07
26 #define MP5416_REG_LDO1			0x08
27 #define MP5416_REG_LDO2			0x09
28 #define MP5416_REG_LDO3			0x0a
29 #define MP5416_REG_LDO4			0x0b
30 
31 #define MP5416_REGULATOR_EN		BIT(7)
32 #define MP5416_MASK_VSET		0x7f
33 #define MP5416_MASK_BUCK1_ILIM		0xc0
34 #define MP5416_MASK_BUCK2_ILIM		0x0c
35 #define MP5416_MASK_BUCK3_ILIM		0x30
36 #define MP5416_MASK_BUCK4_ILIM		0x03
37 #define MP5416_MASK_DVS_SLEWRATE	0xc0
38 
39 /* values in uV */
40 #define MP5416_VOLT1_MIN		600000
41 #define MP5416_VOLT1_MAX		2187500
42 #define MP5416_VOLT1_STEP		12500
43 #define MP5416_VOLT2_MIN		800000
44 #define MP5416_VOLT2_MAX		3975000
45 #define MP5416_VOLT2_STEP		25000
46 
47 #define MP5416_VOLT1_RANGE \
48 	((MP5416_VOLT1_MAX - MP5416_VOLT1_MIN)/MP5416_VOLT1_STEP + 1)
49 #define MP5416_VOLT2_RANGE \
50 	((MP5416_VOLT2_MAX - MP5416_VOLT2_MIN)/MP5416_VOLT2_STEP + 1)
51 
52 #define MP5416BUCK(_name, _id, _ilim, _dreg, _dval, _vsel)		\
53 	[MP5416_BUCK ## _id] = {					\
54 		.id = MP5416_BUCK ## _id,				\
55 		.name = _name,						\
56 		.of_match = _name,					\
57 		.regulators_node = "regulators",			\
58 		.ops = &mp5416_buck_ops,				\
59 		.min_uV = MP5416_VOLT ##_vsel## _MIN,			\
60 		.uV_step = MP5416_VOLT ##_vsel## _STEP,			\
61 		.n_voltages = MP5416_VOLT ##_vsel## _RANGE,		\
62 		.curr_table = _ilim,					\
63 		.n_current_limits = ARRAY_SIZE(_ilim),			\
64 		.csel_reg = MP5416_REG_ILIM,				\
65 		.csel_mask = MP5416_MASK_BUCK ## _id ##_ILIM,		\
66 		.vsel_reg = MP5416_REG_BUCK ## _id,			\
67 		.vsel_mask = MP5416_MASK_VSET,				\
68 		.enable_reg = MP5416_REG_BUCK ## _id,			\
69 		.enable_mask = MP5416_REGULATOR_EN,			\
70 		.ramp_reg = MP5416_REG_CTL2,				\
71 		.ramp_mask = MP5416_MASK_DVS_SLEWRATE,			\
72 		.ramp_delay_table = mp5416_buck_ramp_table,		\
73 		.n_ramp_values = ARRAY_SIZE(mp5416_buck_ramp_table),	\
74 		.active_discharge_on	= _dval,			\
75 		.active_discharge_reg	= _dreg,			\
76 		.active_discharge_mask	= _dval,			\
77 		.owner			= THIS_MODULE,			\
78 	}
79 
80 #define MP5416LDO(_name, _id, _dval)					\
81 	[MP5416_LDO ## _id] = {						\
82 		.id = MP5416_LDO ## _id,				\
83 		.name = _name,						\
84 		.of_match = _name,					\
85 		.regulators_node = "regulators",			\
86 		.ops = &mp5416_ldo_ops,					\
87 		.min_uV = MP5416_VOLT2_MIN,				\
88 		.uV_step = MP5416_VOLT2_STEP,				\
89 		.n_voltages = MP5416_VOLT2_RANGE,			\
90 		.vsel_reg = MP5416_REG_LDO ##_id,			\
91 		.vsel_mask = MP5416_MASK_VSET,				\
92 		.enable_reg = MP5416_REG_LDO ##_id,			\
93 		.enable_mask = MP5416_REGULATOR_EN,			\
94 		.active_discharge_on	= _dval,			\
95 		.active_discharge_reg	= MP5416_REG_CTL2,		\
96 		.active_discharge_mask	= _dval,			\
97 		.owner			= THIS_MODULE,			\
98 	}
99 
100 enum mp5416_regulators {
101 	MP5416_BUCK1,
102 	MP5416_BUCK2,
103 	MP5416_BUCK3,
104 	MP5416_BUCK4,
105 	MP5416_LDO1,
106 	MP5416_LDO2,
107 	MP5416_LDO3,
108 	MP5416_LDO4,
109 	MP5416_MAX_REGULATORS,
110 };
111 
112 static const struct regmap_config mp5416_regmap_config = {
113 	.reg_bits = 8,
114 	.val_bits = 8,
115 	.max_register = 0x0d,
116 };
117 
118 /* Current limits array (in uA)
119  * ILIM1 & ILIM3
120  */
121 static const unsigned int mp5416_I_limits1[] = {
122 	3800000, 4600000, 5600000, 6800000
123 };
124 
125 /* ILIM2 & ILIM4 */
126 static const unsigned int mp5416_I_limits2[] = {
127 	2200000, 3200000, 4200000, 5200000
128 };
129 
130 /*
131  * DVS ramp rate BUCK1 to BUCK4
132  * 00: 32mV/us
133  * 01: 16mV/us
134  * 10: 8mV/us
135  * 11: 4mV/us
136  */
137 static const unsigned int mp5416_buck_ramp_table[] = {
138 	32000, 16000, 8000, 4000
139 };
140 
141 static const struct regulator_ops mp5416_ldo_ops = {
142 	.enable			= regulator_enable_regmap,
143 	.disable		= regulator_disable_regmap,
144 	.is_enabled		= regulator_is_enabled_regmap,
145 	.list_voltage		= regulator_list_voltage_linear,
146 	.map_voltage		= regulator_map_voltage_linear,
147 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
148 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
149 	.set_active_discharge	= regulator_set_active_discharge_regmap,
150 };
151 
152 static const struct regulator_ops mp5416_buck_ops = {
153 	.enable			= regulator_enable_regmap,
154 	.disable		= regulator_disable_regmap,
155 	.is_enabled		= regulator_is_enabled_regmap,
156 	.list_voltage		= regulator_list_voltage_linear,
157 	.map_voltage		= regulator_map_voltage_linear,
158 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
159 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
160 	.set_active_discharge	= regulator_set_active_discharge_regmap,
161 	.get_current_limit	= regulator_get_current_limit_regmap,
162 	.set_current_limit	= regulator_set_current_limit_regmap,
163 	.set_ramp_delay		= regulator_set_ramp_delay_regmap,
164 };
165 
166 static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
167 	MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
168 	MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
169 	MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
170 	MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
171 	MP5416LDO("ldo1", 1, BIT(4)),
172 	MP5416LDO("ldo2", 2, BIT(3)),
173 	MP5416LDO("ldo3", 3, BIT(2)),
174 	MP5416LDO("ldo4", 4, BIT(1)),
175 };
176 
177 static struct regulator_desc mp5496_regulators_desc[MP5416_MAX_REGULATORS] = {
178 	MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
179 	MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 1),
180 	MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
181 	MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 1),
182 	MP5416LDO("ldo1", 1, BIT(4)),
183 	MP5416LDO("ldo2", 2, BIT(3)),
184 	MP5416LDO("ldo3", 3, BIT(2)),
185 	MP5416LDO("ldo4", 4, BIT(1)),
186 };
187 
mp5416_i2c_probe(struct i2c_client * client)188 static int mp5416_i2c_probe(struct i2c_client *client)
189 {
190 	struct device *dev = &client->dev;
191 	struct regulator_config config = { NULL, };
192 	static const struct regulator_desc *desc;
193 	struct regulator_dev *rdev;
194 	struct regmap *regmap;
195 	int i;
196 
197 	regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
198 	if (IS_ERR(regmap)) {
199 		dev_err(dev, "Failed to allocate regmap!\n");
200 		return PTR_ERR(regmap);
201 	}
202 
203 	desc = of_device_get_match_data(dev);
204 	if (!desc)
205 		return -ENODEV;
206 
207 	config.dev = dev;
208 	config.regmap = regmap;
209 
210 	for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
211 		rdev = devm_regulator_register(dev,
212 					       &desc[i],
213 					       &config);
214 		if (IS_ERR(rdev)) {
215 			dev_err(dev, "Failed to register regulator!\n");
216 			return PTR_ERR(rdev);
217 		}
218 	}
219 
220 	return 0;
221 }
222 
223 static const struct of_device_id mp5416_of_match[] = {
224 	{ .compatible = "mps,mp5416", .data = &mp5416_regulators_desc },
225 	{ .compatible = "mps,mp5496", .data = &mp5496_regulators_desc },
226 	{},
227 };
228 MODULE_DEVICE_TABLE(of, mp5416_of_match);
229 
230 static const struct i2c_device_id mp5416_id[] = {
231 	{ "mp5416", },
232 	{ "mp5496", },
233 	{ },
234 };
235 MODULE_DEVICE_TABLE(i2c, mp5416_id);
236 
237 static struct i2c_driver mp5416_regulator_driver = {
238 	.driver = {
239 		.name = "mp5416",
240 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
241 		.of_match_table = of_match_ptr(mp5416_of_match),
242 	},
243 	.probe = mp5416_i2c_probe,
244 	.id_table = mp5416_id,
245 };
246 module_i2c_driver(mp5416_regulator_driver);
247 
248 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
249 MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
250 MODULE_LICENSE("GPL");
251