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