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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // | |
3 | // mpq7920.c - regulator driver for mps mpq7920 | |
4 | // | |
5 | // Copyright 2019 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/of.h> | |
14 | #include <linux/of_device.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regulator/driver.h> | |
17 | #include <linux/regulator/of_regulator.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/regmap.h> | |
20 | #include "mpq7920.h" | |
21 | ||
22 | #define MPQ7920_BUCK_VOLT_RANGE \ | |
23 | ((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) | |
24 | #define MPQ7920_LDO_VOLT_RANGE \ | |
25 | ((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) | |
26 | ||
27 | #define MPQ7920BUCK(_name, _id, _ilim) \ | |
28 | [MPQ7920_BUCK ## _id] = { \ | |
29 | .id = MPQ7920_BUCK ## _id, \ | |
30 | .name = _name, \ | |
31 | .of_match = _name, \ | |
32 | .regulators_node = "regulators", \ | |
33 | .of_parse_cb = mpq7920_parse_cb, \ | |
34 | .ops = &mpq7920_buck_ops, \ | |
35 | .min_uV = MPQ7920_BUCK_VOLT_MIN, \ | |
36 | .uV_step = MPQ7920_VOLT_STEP, \ | |
37 | .n_voltages = MPQ7920_BUCK_VOLT_RANGE, \ | |
38 | .curr_table = _ilim, \ | |
39 | .n_current_limits = ARRAY_SIZE(_ilim), \ | |
40 | .csel_reg = MPQ7920_BUCK ##_id## _REG_C, \ | |
41 | .csel_mask = MPQ7920_MASK_BUCK_ILIM, \ | |
42 | .enable_reg = MPQ7920_REG_REGULATOR_EN, \ | |
43 | .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ | |
44 | MPQ7920_BUCK ## _id), \ | |
45 | .vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \ | |
46 | .vsel_mask = MPQ7920_MASK_VREF, \ | |
47 | .active_discharge_on = MPQ7920_DISCHARGE_ON, \ | |
48 | .active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \ | |
49 | .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ | |
50 | .soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \ | |
51 | .soft_start_mask = MPQ7920_MASK_SOFTSTART, \ | |
52 | .owner = THIS_MODULE, \ | |
53 | } | |
54 | ||
55 | #define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \ | |
56 | [MPQ7920_LDO ## _id] = { \ | |
57 | .id = MPQ7920_LDO ## _id, \ | |
58 | .name = _name, \ | |
59 | .of_match = _name, \ | |
60 | .regulators_node = "regulators", \ | |
61 | .ops = _ops, \ | |
62 | .min_uV = MPQ7920_LDO_VOLT_MIN, \ | |
63 | .uV_step = MPQ7920_VOLT_STEP, \ | |
64 | .n_voltages = MPQ7920_LDO_VOLT_RANGE, \ | |
65 | .vsel_reg = MPQ7920_LDO ##_id## _REG_A, \ | |
66 | .vsel_mask = MPQ7920_MASK_VREF, \ | |
67 | .curr_table = _ilim, \ | |
68 | .n_current_limits = _ilim_sz, \ | |
69 | .csel_reg = _creg, \ | |
70 | .csel_mask = _cmask, \ | |
71 | .enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\ | |
72 | .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ | |
73 | MPQ7920_LDO ##_id + 1), \ | |
74 | .active_discharge_on = MPQ7920_DISCHARGE_ON, \ | |
75 | .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ | |
76 | .active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \ | |
77 | .type = REGULATOR_VOLTAGE, \ | |
78 | .owner = THIS_MODULE, \ | |
79 | } | |
80 | ||
81 | enum mpq7920_regulators { | |
82 | MPQ7920_BUCK1, | |
83 | MPQ7920_BUCK2, | |
84 | MPQ7920_BUCK3, | |
85 | MPQ7920_BUCK4, | |
86 | MPQ7920_LDO1, /* LDORTC */ | |
87 | MPQ7920_LDO2, | |
88 | MPQ7920_LDO3, | |
89 | MPQ7920_LDO4, | |
90 | MPQ7920_LDO5, | |
91 | MPQ7920_MAX_REGULATORS, | |
92 | }; | |
93 | ||
94 | struct mpq7920_regulator_info { | |
6501c1f5 | 95 | struct regmap *regmap; |
6501c1f5 SS |
96 | struct regulator_desc *rdesc; |
97 | }; | |
98 | ||
99 | static const struct regmap_config mpq7920_regmap_config = { | |
100 | .reg_bits = 8, | |
101 | .val_bits = 8, | |
102 | .max_register = 0x25, | |
103 | }; | |
104 | ||
105 | /* Current limits array (in uA) | |
106 | * ILIM1 & ILIM3 | |
107 | */ | |
108 | static const unsigned int mpq7920_I_limits1[] = { | |
109 | 4600000, 6600000, 7600000, 9300000 | |
110 | }; | |
111 | ||
112 | /* ILIM2 & ILIM4 */ | |
113 | static const unsigned int mpq7920_I_limits2[] = { | |
114 | 2700000, 3900000, 5100000, 6100000 | |
115 | }; | |
116 | ||
117 | /* LDO4 & LDO5 */ | |
118 | static const unsigned int mpq7920_I_limits3[] = { | |
119 | 300000, 700000 | |
120 | }; | |
121 | ||
122 | static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay); | |
123 | static int mpq7920_parse_cb(struct device_node *np, | |
124 | const struct regulator_desc *rdesc, | |
125 | struct regulator_config *config); | |
126 | ||
127 | /* RTCLDO not controllable, always ON */ | |
128 | static const struct regulator_ops mpq7920_ldortc_ops = { | |
129 | .list_voltage = regulator_list_voltage_linear, | |
130 | .map_voltage = regulator_map_voltage_linear, | |
131 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
132 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
133 | }; | |
134 | ||
135 | static const struct regulator_ops mpq7920_ldo_wo_current_ops = { | |
136 | .enable = regulator_enable_regmap, | |
137 | .disable = regulator_disable_regmap, | |
138 | .is_enabled = regulator_is_enabled_regmap, | |
139 | .list_voltage = regulator_list_voltage_linear, | |
140 | .map_voltage = regulator_map_voltage_linear, | |
141 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
142 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
143 | .set_active_discharge = regulator_set_active_discharge_regmap, | |
144 | }; | |
145 | ||
146 | static const struct regulator_ops mpq7920_ldo_ops = { | |
147 | .enable = regulator_enable_regmap, | |
148 | .disable = regulator_disable_regmap, | |
149 | .is_enabled = regulator_is_enabled_regmap, | |
150 | .list_voltage = regulator_list_voltage_linear, | |
151 | .map_voltage = regulator_map_voltage_linear, | |
152 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
153 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
154 | .set_active_discharge = regulator_set_active_discharge_regmap, | |
155 | .get_current_limit = regulator_get_current_limit_regmap, | |
156 | .set_current_limit = regulator_set_current_limit_regmap, | |
157 | }; | |
158 | ||
159 | static const struct regulator_ops mpq7920_buck_ops = { | |
160 | .enable = regulator_enable_regmap, | |
161 | .disable = regulator_disable_regmap, | |
162 | .is_enabled = regulator_is_enabled_regmap, | |
163 | .list_voltage = regulator_list_voltage_linear, | |
164 | .map_voltage = regulator_map_voltage_linear, | |
165 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
166 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
167 | .set_active_discharge = regulator_set_active_discharge_regmap, | |
168 | .set_soft_start = regulator_set_soft_start_regmap, | |
169 | .set_ramp_delay = mpq7920_set_ramp_delay, | |
170 | }; | |
171 | ||
172 | static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = { | |
173 | MPQ7920BUCK("buck1", 1, mpq7920_I_limits1), | |
174 | MPQ7920BUCK("buck2", 2, mpq7920_I_limits2), | |
175 | MPQ7920BUCK("buck3", 3, mpq7920_I_limits1), | |
176 | MPQ7920BUCK("buck4", 4, mpq7920_I_limits2), | |
177 | MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0), | |
178 | MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), | |
179 | MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), | |
180 | MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3, | |
181 | ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B, | |
182 | MPQ7920_MASK_LDO_ILIM), | |
183 | MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3, | |
184 | ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B, | |
185 | MPQ7920_MASK_LDO_ILIM), | |
186 | }; | |
187 | ||
188 | /* | |
189 | * DVS ramp rate BUCK1 to BUCK4 | |
190 | * 00-01: Reserved | |
191 | * 10: 8mV/us | |
192 | * 11: 4mV/us | |
193 | */ | |
194 | static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) | |
195 | { | |
196 | unsigned int ramp_val; | |
197 | ||
198 | if (ramp_delay > 8000 || ramp_delay < 0) | |
199 | return -EINVAL; | |
200 | ||
201 | if (ramp_delay <= 4000) | |
202 | ramp_val = 3; | |
203 | else | |
204 | ramp_val = 2; | |
205 | ||
206 | return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0, | |
207 | MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6); | |
208 | } | |
209 | ||
210 | static int mpq7920_parse_cb(struct device_node *np, | |
211 | const struct regulator_desc *desc, | |
212 | struct regulator_config *config) | |
213 | { | |
214 | uint8_t val; | |
215 | int ret; | |
216 | struct mpq7920_regulator_info *info = config->driver_data; | |
217 | struct regulator_desc *rdesc = &info->rdesc[desc->id]; | |
218 | ||
219 | if (of_property_read_bool(np, "mps,buck-ovp-disable")) { | |
220 | regmap_update_bits(config->regmap, | |
221 | MPQ7920_BUCK1_REG_B + (rdesc->id * 4), | |
686f6361 | 222 | MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE); |
6501c1f5 SS |
223 | } |
224 | ||
225 | ret = of_property_read_u8(np, "mps,buck-phase-delay", &val); | |
226 | if (!ret) { | |
227 | regmap_update_bits(config->regmap, | |
228 | MPQ7920_BUCK1_REG_C + (rdesc->id * 4), | |
229 | MPQ7920_MASK_BUCK_PHASE_DEALY, | |
230 | (val & 3) << 4); | |
231 | } | |
232 | ||
233 | ret = of_property_read_u8(np, "mps,buck-softstart", &val); | |
234 | if (!ret) | |
235 | rdesc->soft_start_val_on = (val & 3) << 2; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static void mpq7920_parse_dt(struct device *dev, | |
241 | struct mpq7920_regulator_info *info) | |
242 | { | |
243 | int ret; | |
244 | struct device_node *np = dev->of_node; | |
245 | uint8_t freq; | |
246 | ||
247 | np = of_get_child_by_name(np, "regulators"); | |
248 | if (!np) { | |
249 | dev_err(dev, "missing 'regulators' subnode in DT\n"); | |
250 | return; | |
251 | } | |
252 | ||
253 | ret = of_property_read_u8(np, "mps,switch-freq", &freq); | |
254 | if (!ret) { | |
255 | regmap_update_bits(info->regmap, MPQ7920_REG_CTL0, | |
256 | MPQ7920_MASK_SWITCH_FREQ, | |
257 | (freq & 3) << 4); | |
258 | } | |
259 | ||
260 | of_node_put(np); | |
261 | } | |
262 | ||
5b379b2b | 263 | static int mpq7920_i2c_probe(struct i2c_client *client) |
6501c1f5 SS |
264 | { |
265 | struct device *dev = &client->dev; | |
266 | struct mpq7920_regulator_info *info; | |
267 | struct regulator_config config = { NULL, }; | |
489d6954 | 268 | struct regulator_dev *rdev; |
6501c1f5 | 269 | struct regmap *regmap; |
489d6954 | 270 | int i; |
6501c1f5 SS |
271 | |
272 | info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info), | |
273 | GFP_KERNEL); | |
274 | if (!info) | |
275 | return -ENOMEM; | |
276 | ||
6501c1f5 SS |
277 | info->rdesc = mpq7920_regulators_desc; |
278 | regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config); | |
279 | if (IS_ERR(regmap)) { | |
280 | dev_err(dev, "Failed to allocate regmap!\n"); | |
281 | return PTR_ERR(regmap); | |
282 | } | |
283 | ||
284 | i2c_set_clientdata(client, info); | |
285 | info->regmap = regmap; | |
286 | if (client->dev.of_node) | |
287 | mpq7920_parse_dt(&client->dev, info); | |
288 | ||
489d6954 | 289 | config.dev = dev; |
6501c1f5 SS |
290 | config.regmap = regmap; |
291 | config.driver_data = info; | |
292 | ||
489d6954 AL |
293 | for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) { |
294 | rdev = devm_regulator_register(dev, | |
295 | &mpq7920_regulators_desc[i], | |
296 | &config); | |
297 | if (IS_ERR(rdev)) { | |
298 | dev_err(dev, "Failed to register regulator!\n"); | |
299 | return PTR_ERR(rdev); | |
300 | } | |
301 | } | |
6501c1f5 | 302 | |
489d6954 | 303 | return 0; |
6501c1f5 SS |
304 | } |
305 | ||
306 | static const struct of_device_id mpq7920_of_match[] = { | |
307 | { .compatible = "mps,mpq7920"}, | |
308 | {}, | |
309 | }; | |
310 | MODULE_DEVICE_TABLE(of, mpq7920_of_match); | |
311 | ||
312 | static const struct i2c_device_id mpq7920_id[] = { | |
313 | { "mpq7920", }, | |
314 | { }, | |
315 | }; | |
316 | MODULE_DEVICE_TABLE(i2c, mpq7920_id); | |
317 | ||
318 | static struct i2c_driver mpq7920_regulator_driver = { | |
319 | .driver = { | |
320 | .name = "mpq7920", | |
67dc71c6 | 321 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
6501c1f5 SS |
322 | .of_match_table = of_match_ptr(mpq7920_of_match), |
323 | }, | |
964e1865 | 324 | .probe = mpq7920_i2c_probe, |
6501c1f5 SS |
325 | .id_table = mpq7920_id, |
326 | }; | |
327 | module_i2c_driver(mpq7920_regulator_driver); | |
328 | ||
329 | MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); | |
330 | MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver"); | |
331 | MODULE_LICENSE("GPL"); |