1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TI LM363X Regulator Driver
4 *
5 * Copyright 2015 Texas Instruments
6 *
7 * Author: Milo Kim <milo.kim@ti.com>
8 */
9
10 #include <linux/err.h>
11 #include <linux/kernel.h>
12 #include <linux/mfd/ti-lmu.h>
13 #include <linux/mfd/ti-lmu-register.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/platform_device.h>
18 #include <linux/regulator/driver.h>
19 #include <linux/regulator/of_regulator.h>
20 #include <linux/slab.h>
21
22 /* LM3631 */
23 #define LM3631_BOOST_VSEL_MAX 0x25
24 #define LM3631_LDO_VSEL_MAX 0x28
25 #define LM3631_CONT_VSEL_MAX 0x03
26 #define LM3631_VBOOST_MIN 4500000
27 #define LM3631_VCONT_MIN 1800000
28 #define LM3631_VLDO_MIN 4000000
29 #define ENABLE_TIME_USEC 1000
30
31 /* LM3632 */
32 #define LM3632_BOOST_VSEL_MAX 0x26
33 #define LM3632_LDO_VSEL_MAX 0x28
34 #define LM3632_VBOOST_MIN 4500000
35 #define LM3632_VLDO_MIN 4000000
36
37 /* LM36274 */
38 #define LM36274_BOOST_VSEL_MAX 0x3f
39 #define LM36274_LDO_VSEL_MAX 0x32
40 #define LM36274_VOLTAGE_MIN 4000000
41
42 /* Common */
43 #define LM363X_STEP_50mV 50000
44 #define LM363X_STEP_500mV 500000
45
46 static const int ldo_cont_enable_time[] = {
47 0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
48 };
49
lm363x_regulator_enable_time(struct regulator_dev * rdev)50 static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
51 {
52 enum lm363x_regulator_id id = rdev_get_id(rdev);
53 unsigned int val, addr, mask;
54
55 switch (id) {
56 case LM3631_LDO_CONT:
57 addr = LM3631_REG_ENTIME_VCONT;
58 mask = LM3631_ENTIME_CONT_MASK;
59 break;
60 case LM3631_LDO_OREF:
61 addr = LM3631_REG_ENTIME_VOREF;
62 mask = LM3631_ENTIME_MASK;
63 break;
64 case LM3631_LDO_POS:
65 addr = LM3631_REG_ENTIME_VPOS;
66 mask = LM3631_ENTIME_MASK;
67 break;
68 case LM3631_LDO_NEG:
69 addr = LM3631_REG_ENTIME_VNEG;
70 mask = LM3631_ENTIME_MASK;
71 break;
72 default:
73 return 0;
74 }
75
76 if (regmap_read(rdev->regmap, addr, &val))
77 return -EINVAL;
78
79 val = (val & mask) >> LM3631_ENTIME_SHIFT;
80
81 if (id == LM3631_LDO_CONT)
82 return ldo_cont_enable_time[val];
83 else
84 return ENABLE_TIME_USEC * val;
85 }
86
87 static const struct regulator_ops lm363x_boost_voltage_table_ops = {
88 .list_voltage = regulator_list_voltage_linear,
89 .set_voltage_sel = regulator_set_voltage_sel_regmap,
90 .get_voltage_sel = regulator_get_voltage_sel_regmap,
91 };
92
93 static const struct regulator_ops lm363x_regulator_voltage_table_ops = {
94 .list_voltage = regulator_list_voltage_linear,
95 .set_voltage_sel = regulator_set_voltage_sel_regmap,
96 .get_voltage_sel = regulator_get_voltage_sel_regmap,
97 .enable = regulator_enable_regmap,
98 .disable = regulator_disable_regmap,
99 .is_enabled = regulator_is_enabled_regmap,
100 .enable_time = lm363x_regulator_enable_time,
101 };
102
103 static const struct regulator_desc lm363x_regulator_desc[] = {
104 /* LM3631 */
105 {
106 .name = "vboost",
107 .of_match = "vboost",
108 .id = LM3631_BOOST,
109 .ops = &lm363x_boost_voltage_table_ops,
110 .n_voltages = LM3631_BOOST_VSEL_MAX + 1,
111 .min_uV = LM3631_VBOOST_MIN,
112 .uV_step = LM363X_STEP_50mV,
113 .type = REGULATOR_VOLTAGE,
114 .owner = THIS_MODULE,
115 .vsel_reg = LM3631_REG_VOUT_BOOST,
116 .vsel_mask = LM3631_VOUT_MASK,
117 },
118 {
119 .name = "ldo_cont",
120 .of_match = "vcont",
121 .id = LM3631_LDO_CONT,
122 .ops = &lm363x_regulator_voltage_table_ops,
123 .n_voltages = LM3631_CONT_VSEL_MAX + 1,
124 .min_uV = LM3631_VCONT_MIN,
125 .uV_step = LM363X_STEP_500mV,
126 .type = REGULATOR_VOLTAGE,
127 .owner = THIS_MODULE,
128 .vsel_reg = LM3631_REG_VOUT_CONT,
129 .vsel_mask = LM3631_VOUT_CONT_MASK,
130 .enable_reg = LM3631_REG_LDO_CTRL2,
131 .enable_mask = LM3631_EN_CONT_MASK,
132 },
133 {
134 .name = "ldo_oref",
135 .of_match = "voref",
136 .id = LM3631_LDO_OREF,
137 .ops = &lm363x_regulator_voltage_table_ops,
138 .n_voltages = LM3631_LDO_VSEL_MAX + 1,
139 .min_uV = LM3631_VLDO_MIN,
140 .uV_step = LM363X_STEP_50mV,
141 .type = REGULATOR_VOLTAGE,
142 .owner = THIS_MODULE,
143 .vsel_reg = LM3631_REG_VOUT_OREF,
144 .vsel_mask = LM3631_VOUT_MASK,
145 .enable_reg = LM3631_REG_LDO_CTRL1,
146 .enable_mask = LM3631_EN_OREF_MASK,
147 },
148 {
149 .name = "ldo_vpos",
150 .of_match = "vpos",
151 .id = LM3631_LDO_POS,
152 .ops = &lm363x_regulator_voltage_table_ops,
153 .n_voltages = LM3631_LDO_VSEL_MAX + 1,
154 .min_uV = LM3631_VLDO_MIN,
155 .uV_step = LM363X_STEP_50mV,
156 .type = REGULATOR_VOLTAGE,
157 .owner = THIS_MODULE,
158 .vsel_reg = LM3631_REG_VOUT_POS,
159 .vsel_mask = LM3631_VOUT_MASK,
160 .enable_reg = LM3631_REG_LDO_CTRL1,
161 .enable_mask = LM3631_EN_VPOS_MASK,
162 },
163 {
164 .name = "ldo_vneg",
165 .of_match = "vneg",
166 .id = LM3631_LDO_NEG,
167 .ops = &lm363x_regulator_voltage_table_ops,
168 .n_voltages = LM3631_LDO_VSEL_MAX + 1,
169 .min_uV = LM3631_VLDO_MIN,
170 .uV_step = LM363X_STEP_50mV,
171 .type = REGULATOR_VOLTAGE,
172 .owner = THIS_MODULE,
173 .vsel_reg = LM3631_REG_VOUT_NEG,
174 .vsel_mask = LM3631_VOUT_MASK,
175 .enable_reg = LM3631_REG_LDO_CTRL1,
176 .enable_mask = LM3631_EN_VNEG_MASK,
177 },
178 /* LM3632 */
179 {
180 .name = "vboost",
181 .of_match = "vboost",
182 .id = LM3632_BOOST,
183 .ops = &lm363x_boost_voltage_table_ops,
184 .n_voltages = LM3632_BOOST_VSEL_MAX + 1,
185 .min_uV = LM3632_VBOOST_MIN,
186 .uV_step = LM363X_STEP_50mV,
187 .type = REGULATOR_VOLTAGE,
188 .owner = THIS_MODULE,
189 .vsel_reg = LM3632_REG_VOUT_BOOST,
190 .vsel_mask = LM3632_VOUT_MASK,
191 },
192 {
193 .name = "ldo_vpos",
194 .of_match = "vpos",
195 .id = LM3632_LDO_POS,
196 .ops = &lm363x_regulator_voltage_table_ops,
197 .n_voltages = LM3632_LDO_VSEL_MAX + 1,
198 .min_uV = LM3632_VLDO_MIN,
199 .uV_step = LM363X_STEP_50mV,
200 .type = REGULATOR_VOLTAGE,
201 .owner = THIS_MODULE,
202 .vsel_reg = LM3632_REG_VOUT_POS,
203 .vsel_mask = LM3632_VOUT_MASK,
204 .enable_reg = LM3632_REG_BIAS_CONFIG,
205 .enable_mask = LM3632_EN_VPOS_MASK,
206 },
207 {
208 .name = "ldo_vneg",
209 .of_match = "vneg",
210 .id = LM3632_LDO_NEG,
211 .ops = &lm363x_regulator_voltage_table_ops,
212 .n_voltages = LM3632_LDO_VSEL_MAX + 1,
213 .min_uV = LM3632_VLDO_MIN,
214 .uV_step = LM363X_STEP_50mV,
215 .type = REGULATOR_VOLTAGE,
216 .owner = THIS_MODULE,
217 .vsel_reg = LM3632_REG_VOUT_NEG,
218 .vsel_mask = LM3632_VOUT_MASK,
219 .enable_reg = LM3632_REG_BIAS_CONFIG,
220 .enable_mask = LM3632_EN_VNEG_MASK,
221 },
222
223 /* LM36274 */
224 {
225 .name = "vboost",
226 .of_match = "vboost",
227 .id = LM36274_BOOST,
228 .ops = &lm363x_boost_voltage_table_ops,
229 .n_voltages = LM36274_BOOST_VSEL_MAX + 1,
230 .min_uV = LM36274_VOLTAGE_MIN,
231 .uV_step = LM363X_STEP_50mV,
232 .type = REGULATOR_VOLTAGE,
233 .owner = THIS_MODULE,
234 .vsel_reg = LM36274_REG_VOUT_BOOST,
235 .vsel_mask = LM36274_VOUT_MASK,
236 },
237 {
238 .name = "ldo_vpos",
239 .of_match = "vpos",
240 .id = LM36274_LDO_POS,
241 .ops = &lm363x_regulator_voltage_table_ops,
242 .n_voltages = LM36274_LDO_VSEL_MAX + 1,
243 .min_uV = LM36274_VOLTAGE_MIN,
244 .uV_step = LM363X_STEP_50mV,
245 .type = REGULATOR_VOLTAGE,
246 .owner = THIS_MODULE,
247 .vsel_reg = LM36274_REG_VOUT_POS,
248 .vsel_mask = LM36274_VOUT_MASK,
249 .enable_reg = LM36274_REG_BIAS_CONFIG_1,
250 .enable_mask = LM36274_EN_VPOS_MASK,
251 },
252 {
253 .name = "ldo_vneg",
254 .of_match = "vneg",
255 .id = LM36274_LDO_NEG,
256 .ops = &lm363x_regulator_voltage_table_ops,
257 .n_voltages = LM36274_LDO_VSEL_MAX + 1,
258 .min_uV = LM36274_VOLTAGE_MIN,
259 .uV_step = LM363X_STEP_50mV,
260 .type = REGULATOR_VOLTAGE,
261 .owner = THIS_MODULE,
262 .vsel_reg = LM36274_REG_VOUT_NEG,
263 .vsel_mask = LM36274_VOUT_MASK,
264 .enable_reg = LM36274_REG_BIAS_CONFIG_1,
265 .enable_mask = LM36274_EN_VNEG_MASK,
266 },
267 };
268
lm363x_regulator_of_get_enable_gpio(struct device * dev,int id)269 static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev, int id)
270 {
271 /*
272 * Check LCM_EN1/2_GPIO is configured.
273 * Those pins are used for enabling VPOS/VNEG LDOs.
274 * Do not use devm* here: the regulator core takes over the
275 * lifecycle management of the GPIO descriptor.
276 */
277 switch (id) {
278 case LM3632_LDO_POS:
279 case LM36274_LDO_POS:
280 return gpiod_get_index_optional(dev, "enable", 0,
281 GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
282 case LM3632_LDO_NEG:
283 case LM36274_LDO_NEG:
284 return gpiod_get_index_optional(dev, "enable", 1,
285 GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
286 default:
287 return NULL;
288 }
289 }
290
lm363x_regulator_set_ext_en(struct regmap * regmap,int id)291 static int lm363x_regulator_set_ext_en(struct regmap *regmap, int id)
292 {
293 int ext_en_mask = 0;
294
295 switch (id) {
296 case LM3632_LDO_POS:
297 case LM3632_LDO_NEG:
298 ext_en_mask = LM3632_EXT_EN_MASK;
299 break;
300 case LM36274_LDO_POS:
301 case LM36274_LDO_NEG:
302 ext_en_mask = LM36274_EXT_EN_MASK;
303 break;
304 default:
305 return -ENODEV;
306 }
307
308 return regmap_update_bits(regmap, lm363x_regulator_desc[id].enable_reg,
309 ext_en_mask, ext_en_mask);
310 }
311
lm363x_regulator_probe(struct platform_device * pdev)312 static int lm363x_regulator_probe(struct platform_device *pdev)
313 {
314 struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
315 struct regmap *regmap = lmu->regmap;
316 struct regulator_config cfg = { };
317 struct regulator_dev *rdev;
318 struct device *dev = &pdev->dev;
319 int id = pdev->id;
320 struct gpio_desc *gpiod;
321 int ret;
322
323 cfg.dev = dev;
324 cfg.regmap = regmap;
325
326 /*
327 * LM3632 LDOs can be controlled by external pin.
328 * Register update is required if the pin is used.
329 */
330 gpiod = lm363x_regulator_of_get_enable_gpio(dev, id);
331 if (IS_ERR(gpiod))
332 return PTR_ERR(gpiod);
333
334 if (gpiod) {
335 cfg.ena_gpiod = gpiod;
336 ret = lm363x_regulator_set_ext_en(regmap, id);
337 if (ret) {
338 gpiod_put(gpiod);
339 dev_err(dev, "External pin err: %d\n", ret);
340 return ret;
341 }
342 }
343
344 rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
345 if (IS_ERR(rdev)) {
346 ret = PTR_ERR(rdev);
347 dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
348 return ret;
349 }
350
351 return 0;
352 }
353
354 static struct platform_driver lm363x_regulator_driver = {
355 .probe = lm363x_regulator_probe,
356 .driver = {
357 .name = "lm363x-regulator",
358 },
359 };
360
361 module_platform_driver(lm363x_regulator_driver);
362
363 MODULE_DESCRIPTION("TI LM363X Regulator Driver");
364 MODULE_AUTHOR("Milo Kim");
365 MODULE_LICENSE("GPL v2");
366 MODULE_ALIAS("platform:lm363x-regulator");
367