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97be8288 JZ |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
751ca3aa | 3 | // MP8867/MP8869 regulator driver |
97be8288 JZ |
4 | // |
5 | // Copyright (C) 2020 Synaptics Incorporated | |
6 | // | |
7 | // Author: Jisheng Zhang <jszhang@kernel.org> | |
8 | ||
9 | #include <linux/gpio/consumer.h> | |
10 | #include <linux/i2c.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of_device.h> | |
13 | #include <linux/regmap.h> | |
14 | #include <linux/regulator/driver.h> | |
15 | #include <linux/regulator/of_regulator.h> | |
16 | ||
17 | #define MP886X_VSEL 0x00 | |
18 | #define MP886X_V_BOOT (1 << 7) | |
19 | #define MP886X_SYSCNTLREG1 0x01 | |
20 | #define MP886X_MODE (1 << 0) | |
0eddcf02 JZ |
21 | #define MP886X_SLEW_SHIFT 3 |
22 | #define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT) | |
97be8288 JZ |
23 | #define MP886X_GO (1 << 6) |
24 | #define MP886X_EN (1 << 7) | |
ee6ad5a2 | 25 | #define MP8869_SYSCNTLREG2 0x02 |
97be8288 | 26 | |
0eddcf02 JZ |
27 | struct mp886x_cfg_info { |
28 | const struct regulator_ops *rops; | |
e1e8d55b | 29 | const unsigned int slew_rates[8]; |
ee6ad5a2 JZ |
30 | const int switch_freq[4]; |
31 | const u8 fs_reg; | |
32 | const u8 fs_shift; | |
0eddcf02 JZ |
33 | }; |
34 | ||
97be8288 JZ |
35 | struct mp886x_device_info { |
36 | struct device *dev; | |
37 | struct regulator_desc desc; | |
38 | struct regulator_init_data *regulator; | |
39 | struct gpio_desc *en_gpio; | |
0eddcf02 | 40 | const struct mp886x_cfg_info *ci; |
97be8288 JZ |
41 | u32 r[2]; |
42 | unsigned int sel; | |
43 | }; | |
44 | ||
ee6ad5a2 JZ |
45 | static void mp886x_set_switch_freq(struct mp886x_device_info *di, |
46 | struct regmap *regmap, | |
47 | u32 freq) | |
48 | { | |
49 | const struct mp886x_cfg_info *ci = di->ci; | |
50 | int i; | |
51 | ||
52 | for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) { | |
53 | if (freq == ci->switch_freq[i]) { | |
54 | regmap_update_bits(regmap, ci->fs_reg, | |
55 | 0x3 << ci->fs_shift, i << ci->fs_shift); | |
56 | return; | |
57 | } | |
58 | } | |
59 | ||
60 | dev_err(di->dev, "invalid frequency %d\n", freq); | |
61 | } | |
62 | ||
97be8288 JZ |
63 | static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode) |
64 | { | |
65 | switch (mode) { | |
66 | case REGULATOR_MODE_FAST: | |
67 | regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, | |
68 | MP886X_MODE, MP886X_MODE); | |
69 | break; | |
70 | case REGULATOR_MODE_NORMAL: | |
71 | regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, | |
72 | MP886X_MODE, 0); | |
73 | break; | |
74 | default: | |
75 | return -EINVAL; | |
76 | } | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static unsigned int mp886x_get_mode(struct regulator_dev *rdev) | |
81 | { | |
82 | u32 val; | |
83 | int ret; | |
84 | ||
85 | ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val); | |
86 | if (ret < 0) | |
87 | return ret; | |
88 | if (val & MP886X_MODE) | |
89 | return REGULATOR_MODE_FAST; | |
90 | else | |
91 | return REGULATOR_MODE_NORMAL; | |
92 | } | |
93 | ||
94 | static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) | |
95 | { | |
96 | int ret; | |
97 | ||
98 | ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, | |
99 | MP886X_GO, MP886X_GO); | |
100 | if (ret < 0) | |
101 | return ret; | |
102 | ||
103 | sel <<= ffs(rdev->desc->vsel_mask) - 1; | |
104 | return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, | |
105 | MP886X_V_BOOT | rdev->desc->vsel_mask, sel); | |
106 | } | |
107 | ||
108 | static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2) | |
109 | { | |
110 | u32 tmp = uv * r1 / r2; | |
111 | ||
112 | return uv + tmp; | |
113 | } | |
114 | ||
115 | static int mp8869_get_voltage_sel(struct regulator_dev *rdev) | |
116 | { | |
117 | struct mp886x_device_info *di = rdev_get_drvdata(rdev); | |
118 | int ret, uv; | |
119 | unsigned int val; | |
120 | bool fbloop; | |
121 | ||
122 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); | |
123 | if (ret) | |
124 | return ret; | |
125 | ||
126 | fbloop = val & MP886X_V_BOOT; | |
127 | if (fbloop) { | |
128 | uv = rdev->desc->min_uV; | |
129 | uv = mp8869_scale(uv, di->r[0], di->r[1]); | |
130 | return regulator_map_voltage_linear(rdev, uv, uv); | |
131 | } | |
132 | ||
133 | val &= rdev->desc->vsel_mask; | |
134 | val >>= ffs(rdev->desc->vsel_mask) - 1; | |
135 | ||
136 | return val; | |
137 | } | |
138 | ||
139 | static const struct regulator_ops mp8869_regulator_ops = { | |
140 | .set_voltage_sel = mp8869_set_voltage_sel, | |
141 | .get_voltage_sel = mp8869_get_voltage_sel, | |
142 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
143 | .map_voltage = regulator_map_voltage_linear, | |
144 | .list_voltage = regulator_list_voltage_linear, | |
145 | .enable = regulator_enable_regmap, | |
146 | .disable = regulator_disable_regmap, | |
147 | .is_enabled = regulator_is_enabled_regmap, | |
148 | .set_mode = mp886x_set_mode, | |
149 | .get_mode = mp886x_get_mode, | |
e1e8d55b | 150 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
0eddcf02 JZ |
151 | }; |
152 | ||
153 | static const struct mp886x_cfg_info mp8869_ci = { | |
154 | .rops = &mp8869_regulator_ops, | |
155 | .slew_rates = { | |
156 | 40000, | |
157 | 30000, | |
158 | 20000, | |
159 | 10000, | |
160 | 5000, | |
161 | 2500, | |
162 | 1250, | |
163 | 625, | |
164 | }, | |
ee6ad5a2 JZ |
165 | .switch_freq = { |
166 | 500000, | |
167 | 750000, | |
168 | 1000000, | |
169 | 1250000, | |
170 | }, | |
171 | .fs_reg = MP8869_SYSCNTLREG2, | |
172 | .fs_shift = 4, | |
97be8288 JZ |
173 | }; |
174 | ||
751ca3aa JZ |
175 | static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) |
176 | { | |
177 | struct mp886x_device_info *di = rdev_get_drvdata(rdev); | |
178 | int ret, delta; | |
179 | ||
180 | ret = mp8869_set_voltage_sel(rdev, sel); | |
181 | if (ret < 0) | |
182 | return ret; | |
183 | ||
184 | delta = di->sel - sel; | |
185 | if (abs(delta) <= 5) | |
186 | ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, | |
187 | MP886X_GO, 0); | |
188 | di->sel = sel; | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | static int mp8867_get_voltage_sel(struct regulator_dev *rdev) | |
194 | { | |
195 | struct mp886x_device_info *di = rdev_get_drvdata(rdev); | |
196 | int ret, uv; | |
197 | unsigned int val; | |
198 | bool fbloop; | |
199 | ||
200 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); | |
201 | if (ret) | |
202 | return ret; | |
203 | ||
204 | fbloop = val & MP886X_V_BOOT; | |
205 | ||
206 | val &= rdev->desc->vsel_mask; | |
207 | val >>= ffs(rdev->desc->vsel_mask) - 1; | |
208 | ||
209 | if (fbloop) { | |
210 | uv = regulator_list_voltage_linear(rdev, val); | |
211 | uv = mp8869_scale(uv, di->r[0], di->r[1]); | |
212 | return regulator_map_voltage_linear(rdev, uv, uv); | |
213 | } | |
214 | ||
215 | return val; | |
216 | } | |
217 | ||
218 | static const struct regulator_ops mp8867_regulator_ops = { | |
219 | .set_voltage_sel = mp8867_set_voltage_sel, | |
220 | .get_voltage_sel = mp8867_get_voltage_sel, | |
221 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
222 | .map_voltage = regulator_map_voltage_linear, | |
223 | .list_voltage = regulator_list_voltage_linear, | |
224 | .enable = regulator_enable_regmap, | |
225 | .disable = regulator_disable_regmap, | |
226 | .is_enabled = regulator_is_enabled_regmap, | |
227 | .set_mode = mp886x_set_mode, | |
228 | .get_mode = mp886x_get_mode, | |
e1e8d55b | 229 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
0eddcf02 JZ |
230 | }; |
231 | ||
232 | static const struct mp886x_cfg_info mp8867_ci = { | |
233 | .rops = &mp8867_regulator_ops, | |
234 | .slew_rates = { | |
235 | 64000, | |
236 | 32000, | |
237 | 16000, | |
238 | 8000, | |
239 | 4000, | |
240 | 2000, | |
241 | 1000, | |
242 | 500, | |
243 | }, | |
ee6ad5a2 JZ |
244 | .switch_freq = { |
245 | 500000, | |
246 | 750000, | |
247 | 1000000, | |
248 | 1500000, | |
249 | }, | |
250 | .fs_reg = MP886X_SYSCNTLREG1, | |
251 | .fs_shift = 1, | |
751ca3aa JZ |
252 | }; |
253 | ||
97be8288 JZ |
254 | static int mp886x_regulator_register(struct mp886x_device_info *di, |
255 | struct regulator_config *config) | |
256 | { | |
257 | struct regulator_desc *rdesc = &di->desc; | |
258 | struct regulator_dev *rdev; | |
259 | ||
260 | rdesc->name = "mp886x-reg"; | |
261 | rdesc->supply_name = "vin"; | |
0eddcf02 | 262 | rdesc->ops = di->ci->rops; |
97be8288 JZ |
263 | rdesc->type = REGULATOR_VOLTAGE; |
264 | rdesc->n_voltages = 128; | |
265 | rdesc->enable_reg = MP886X_SYSCNTLREG1; | |
266 | rdesc->enable_mask = MP886X_EN; | |
267 | rdesc->min_uV = 600000; | |
268 | rdesc->uV_step = 10000; | |
269 | rdesc->vsel_reg = MP886X_VSEL; | |
270 | rdesc->vsel_mask = 0x3f; | |
e1e8d55b AL |
271 | rdesc->ramp_reg = MP886X_SYSCNTLREG1; |
272 | rdesc->ramp_mask = MP886X_SLEW_MASK; | |
273 | rdesc->ramp_delay_table = di->ci->slew_rates; | |
274 | rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates); | |
97be8288 JZ |
275 | rdesc->owner = THIS_MODULE; |
276 | ||
277 | rdev = devm_regulator_register(di->dev, &di->desc, config); | |
278 | if (IS_ERR(rdev)) | |
279 | return PTR_ERR(rdev); | |
280 | di->sel = rdesc->ops->get_voltage_sel(rdev); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static const struct regmap_config mp886x_regmap_config = { | |
285 | .reg_bits = 8, | |
286 | .val_bits = 8, | |
287 | }; | |
288 | ||
e2c6678b | 289 | static int mp886x_i2c_probe(struct i2c_client *client) |
97be8288 JZ |
290 | { |
291 | struct device *dev = &client->dev; | |
292 | struct device_node *np = dev->of_node; | |
293 | struct mp886x_device_info *di; | |
294 | struct regulator_config config = { }; | |
295 | struct regmap *regmap; | |
ee6ad5a2 | 296 | u32 freq; |
97be8288 JZ |
297 | int ret; |
298 | ||
299 | di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL); | |
300 | if (!di) | |
301 | return -ENOMEM; | |
302 | ||
303 | di->regulator = of_get_regulator_init_data(dev, np, &di->desc); | |
304 | if (!di->regulator) { | |
305 | dev_err(dev, "Platform data not found!\n"); | |
306 | return -EINVAL; | |
307 | } | |
308 | ||
309 | ret = of_property_read_u32_array(np, "mps,fb-voltage-divider", | |
310 | di->r, 2); | |
311 | if (ret) | |
312 | return ret; | |
313 | ||
314 | di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH); | |
315 | if (IS_ERR(di->en_gpio)) | |
316 | return PTR_ERR(di->en_gpio); | |
317 | ||
0eddcf02 | 318 | di->ci = of_device_get_match_data(dev); |
97be8288 JZ |
319 | di->dev = dev; |
320 | ||
321 | regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config); | |
322 | if (IS_ERR(regmap)) { | |
323 | dev_err(dev, "Failed to allocate regmap!\n"); | |
324 | return PTR_ERR(regmap); | |
325 | } | |
326 | i2c_set_clientdata(client, di); | |
327 | ||
328 | config.dev = di->dev; | |
329 | config.init_data = di->regulator; | |
330 | config.regmap = regmap; | |
331 | config.driver_data = di; | |
332 | config.of_node = np; | |
333 | ||
a5f79495 | 334 | if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq)) |
ee6ad5a2 JZ |
335 | mp886x_set_switch_freq(di, regmap, freq); |
336 | ||
97be8288 JZ |
337 | ret = mp886x_regulator_register(di, &config); |
338 | if (ret < 0) | |
339 | dev_err(dev, "Failed to register regulator!\n"); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | static const struct of_device_id mp886x_dt_ids[] = { | |
751ca3aa JZ |
344 | { |
345 | .compatible = "mps,mp8867", | |
0eddcf02 | 346 | .data = &mp8867_ci |
751ca3aa | 347 | }, |
97be8288 JZ |
348 | { |
349 | .compatible = "mps,mp8869", | |
0eddcf02 | 350 | .data = &mp8869_ci |
97be8288 JZ |
351 | }, |
352 | { } | |
353 | }; | |
354 | MODULE_DEVICE_TABLE(of, mp886x_dt_ids); | |
355 | ||
356 | static const struct i2c_device_id mp886x_id[] = { | |
357 | { "mp886x", }, | |
358 | { }, | |
359 | }; | |
360 | MODULE_DEVICE_TABLE(i2c, mp886x_id); | |
361 | ||
362 | static struct i2c_driver mp886x_regulator_driver = { | |
363 | .driver = { | |
364 | .name = "mp886x-regulator", | |
365 | .of_match_table = of_match_ptr(mp886x_dt_ids), | |
366 | }, | |
e2c6678b | 367 | .probe_new = mp886x_i2c_probe, |
97be8288 JZ |
368 | .id_table = mp886x_id, |
369 | }; | |
370 | module_i2c_driver(mp886x_regulator_driver); | |
371 | ||
372 | MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); | |
373 | MODULE_DESCRIPTION("MP886x regulator driver"); | |
374 | MODULE_LICENSE("GPL v2"); |