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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 | ||
502cdd60 | 76 | #define MP5416LDO(_name, _id, _dval) \ |
a273188b SS |
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, \ | |
502cdd60 | 90 | .active_discharge_on = _dval, \ |
a273188b | 91 | .active_discharge_reg = MP5416_REG_CTL2, \ |
502cdd60 | 92 | .active_discharge_mask = _dval, \ |
a273188b SS |
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), | |
502cdd60 AL |
158 | MP5416LDO("ldo1", 1, BIT(4)), |
159 | MP5416LDO("ldo2", 2, BIT(3)), | |
160 | MP5416LDO("ldo3", 3, BIT(2)), | |
161 | MP5416LDO("ldo4", 4, BIT(1)), | |
a273188b SS |
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 | */ | |
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 | ||
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"); |