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/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/i2c.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 .active_discharge_on = _dval, \
71 .active_discharge_reg = _dreg, \
72 .active_discharge_mask = _dval, \
73 .owner = THIS_MODULE, \
74 }
75
76 #define MP5416LDO(_name, _id, _dval) \
77 [MP5416_LDO ## _id] = { \
78 .id = MP5416_LDO ## _id, \
79 .name = _name, \
80 .of_match = _name, \
81 .regulators_node = "regulators", \
82 .ops = &mp5416_ldo_ops, \
83 .min_uV = MP5416_VOLT2_MIN, \
84 .uV_step = MP5416_VOLT2_STEP, \
85 .n_voltages = MP5416_VOLT2_RANGE, \
86 .vsel_reg = MP5416_REG_LDO ##_id, \
87 .vsel_mask = MP5416_MASK_VSET, \
88 .enable_reg = MP5416_REG_LDO ##_id, \
89 .enable_mask = MP5416_REGULATOR_EN, \
90 .active_discharge_on = _dval, \
91 .active_discharge_reg = MP5416_REG_CTL2, \
92 .active_discharge_mask = _dval, \
93 .owner = THIS_MODULE, \
94 }
95
96 enum mp5416_regulators {
97 MP5416_BUCK1,
98 MP5416_BUCK2,
99 MP5416_BUCK3,
100 MP5416_BUCK4,
101 MP5416_LDO1,
102 MP5416_LDO2,
103 MP5416_LDO3,
104 MP5416_LDO4,
105 MP5416_MAX_REGULATORS,
106 };
107
108 static const struct regmap_config mp5416_regmap_config = {
109 .reg_bits = 8,
110 .val_bits = 8,
111 .max_register = 0x0d,
112 };
113
114 /* Current limits array (in uA)
115 * ILIM1 & ILIM3
116 */
117 static const unsigned int mp5416_I_limits1[] = {
118 3800000, 4600000, 5600000, 6800000
119 };
120
121 /* ILIM2 & ILIM4 */
122 static const unsigned int mp5416_I_limits2[] = {
123 2200000, 3200000, 4200000, 5200000
124 };
125
126 static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
127
128 static const struct regulator_ops mp5416_ldo_ops = {
129 .enable = regulator_enable_regmap,
130 .disable = regulator_disable_regmap,
131 .is_enabled = regulator_is_enabled_regmap,
132 .list_voltage = regulator_list_voltage_linear,
133 .map_voltage = regulator_map_voltage_linear,
134 .get_voltage_sel = regulator_get_voltage_sel_regmap,
135 .set_voltage_sel = regulator_set_voltage_sel_regmap,
136 .set_active_discharge = regulator_set_active_discharge_regmap,
137 };
138
139 static const struct regulator_ops mp5416_buck_ops = {
140 .enable = regulator_enable_regmap,
141 .disable = regulator_disable_regmap,
142 .is_enabled = regulator_is_enabled_regmap,
143 .list_voltage = regulator_list_voltage_linear,
144 .map_voltage = regulator_map_voltage_linear,
145 .get_voltage_sel = regulator_get_voltage_sel_regmap,
146 .set_voltage_sel = regulator_set_voltage_sel_regmap,
147 .set_active_discharge = regulator_set_active_discharge_regmap,
148 .get_current_limit = regulator_get_current_limit_regmap,
149 .set_current_limit = regulator_set_current_limit_regmap,
150 .set_ramp_delay = mp5416_set_ramp_delay,
151 };
152
153 static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
154 MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
155 MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
156 MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
157 MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
158 MP5416LDO("ldo1", 1, BIT(4)),
159 MP5416LDO("ldo2", 2, BIT(3)),
160 MP5416LDO("ldo3", 3, BIT(2)),
161 MP5416LDO("ldo4", 4, BIT(1)),
162 };
163
164 /*
165 * DVS ramp rate BUCK1 to BUCK4
166 * 00: 32mV/us
167 * 01: 16mV/us
168 * 10: 8mV/us
169 * 11: 4mV/us
170 */
mp5416_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)171 static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
172 {
173 unsigned int ramp_val;
174
175 if (ramp_delay > 32000 || ramp_delay < 0)
176 return -EINVAL;
177
178 if (ramp_delay <= 4000)
179 ramp_val = 3;
180 else if (ramp_delay <= 8000)
181 ramp_val = 2;
182 else if (ramp_delay <= 16000)
183 ramp_val = 1;
184 else
185 ramp_val = 0;
186
187 return regmap_update_bits(rdev->regmap, MP5416_REG_CTL2,
188 MP5416_MASK_DVS_SLEWRATE, ramp_val << 6);
189 }
190
mp5416_i2c_probe(struct i2c_client * client)191 static int mp5416_i2c_probe(struct i2c_client *client)
192 {
193 struct device *dev = &client->dev;
194 struct regulator_config config = { NULL, };
195 struct regulator_dev *rdev;
196 struct regmap *regmap;
197 int i;
198
199 regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
200 if (IS_ERR(regmap)) {
201 dev_err(dev, "Failed to allocate regmap!\n");
202 return PTR_ERR(regmap);
203 }
204
205 config.dev = dev;
206 config.regmap = regmap;
207
208 for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
209 rdev = devm_regulator_register(dev,
210 &mp5416_regulators_desc[i],
211 &config);
212 if (IS_ERR(rdev)) {
213 dev_err(dev, "Failed to register regulator!\n");
214 return PTR_ERR(rdev);
215 }
216 }
217
218 return 0;
219 }
220
221 static const struct of_device_id mp5416_of_match[] = {
222 { .compatible = "mps,mp5416" },
223 {},
224 };
225 MODULE_DEVICE_TABLE(of, mp5416_of_match);
226
227 static const struct i2c_device_id mp5416_id[] = {
228 { "mp5416", },
229 { },
230 };
231 MODULE_DEVICE_TABLE(i2c, mp5416_id);
232
233 static struct i2c_driver mp5416_regulator_driver = {
234 .driver = {
235 .name = "mp5416",
236 .of_match_table = of_match_ptr(mp5416_of_match),
237 },
238 .probe_new = mp5416_i2c_probe,
239 .id_table = mp5416_id,
240 };
241 module_i2c_driver(mp5416_regulator_driver);
242
243 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
244 MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
245 MODULE_LICENSE("GPL");
246