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[karo-tx-linux.git] / drivers / regulator / lm363x-regulator.c
1 /*
2  * TI LM363X Regulator Driver
3  *
4  * Copyright 2015 Texas Instruments
5  *
6  * Author: Milo Kim <milo.kim@ti.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/err.h>
14 #include <linux/kernel.h>
15 #include <linux/mfd/ti-lmu.h>
16 #include <linux/mfd/ti-lmu-register.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/of_gpio.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/of_regulator.h>
23 #include <linux/slab.h>
24
25 /* LM3631 */
26 #define LM3631_BOOST_VSEL_MAX           0x25
27 #define LM3631_LDO_VSEL_MAX             0x28
28 #define LM3631_CONT_VSEL_MAX            0x03
29 #define LM3631_VBOOST_MIN               4500000
30 #define LM3631_VCONT_MIN                1800000
31 #define LM3631_VLDO_MIN                 4000000
32 #define ENABLE_TIME_USEC                1000
33
34 /* LM3632 */
35 #define LM3632_BOOST_VSEL_MAX           0x26
36 #define LM3632_LDO_VSEL_MAX             0x29
37 #define LM3632_VBOOST_MIN               4500000
38 #define LM3632_VLDO_MIN                 4000000
39
40 /* Common */
41 #define LM363X_STEP_50mV                50000
42 #define LM363X_STEP_500mV               500000
43
44 static const int ldo_cont_enable_time[] = {
45         0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
46 };
47
48 static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
49 {
50         enum lm363x_regulator_id id = rdev_get_id(rdev);
51         u8 val, addr, mask;
52
53         switch (id) {
54         case LM3631_LDO_CONT:
55                 addr = LM3631_REG_ENTIME_VCONT;
56                 mask = LM3631_ENTIME_CONT_MASK;
57                 break;
58         case LM3631_LDO_OREF:
59                 addr = LM3631_REG_ENTIME_VOREF;
60                 mask = LM3631_ENTIME_MASK;
61                 break;
62         case LM3631_LDO_POS:
63                 addr = LM3631_REG_ENTIME_VPOS;
64                 mask = LM3631_ENTIME_MASK;
65                 break;
66         case LM3631_LDO_NEG:
67                 addr = LM3631_REG_ENTIME_VNEG;
68                 mask = LM3631_ENTIME_MASK;
69                 break;
70         default:
71                 return 0;
72         }
73
74         if (regmap_read(rdev->regmap, addr, (unsigned int *)&val))
75                 return -EINVAL;
76
77         val = (val & mask) >> LM3631_ENTIME_SHIFT;
78
79         if (id == LM3631_LDO_CONT)
80                 return ldo_cont_enable_time[val];
81         else
82                 return ENABLE_TIME_USEC * val;
83 }
84
85 static struct regulator_ops lm363x_boost_voltage_table_ops = {
86         .list_voltage     = regulator_list_voltage_linear,
87         .set_voltage_sel  = regulator_set_voltage_sel_regmap,
88         .get_voltage_sel  = regulator_get_voltage_sel_regmap,
89 };
90
91 static struct regulator_ops lm363x_regulator_voltage_table_ops = {
92         .list_voltage     = regulator_list_voltage_linear,
93         .set_voltage_sel  = regulator_set_voltage_sel_regmap,
94         .get_voltage_sel  = regulator_get_voltage_sel_regmap,
95         .enable           = regulator_enable_regmap,
96         .disable          = regulator_disable_regmap,
97         .is_enabled       = regulator_is_enabled_regmap,
98         .enable_time      = lm363x_regulator_enable_time,
99 };
100
101 static const struct regulator_desc lm363x_regulator_desc[] = {
102         /* LM3631 */
103         {
104                 .name           = "vboost",
105                 .of_match       = "vboost",
106                 .id             = LM3631_BOOST,
107                 .ops            = &lm363x_boost_voltage_table_ops,
108                 .n_voltages     = LM3631_BOOST_VSEL_MAX + 1,
109                 .min_uV         = LM3631_VBOOST_MIN,
110                 .uV_step        = LM363X_STEP_50mV,
111                 .type           = REGULATOR_VOLTAGE,
112                 .owner          = THIS_MODULE,
113                 .vsel_reg       = LM3631_REG_VOUT_BOOST,
114                 .vsel_mask      = LM3631_VOUT_MASK,
115         },
116         {
117                 .name           = "ldo_cont",
118                 .of_match       = "vcont",
119                 .id             = LM3631_LDO_CONT,
120                 .ops            = &lm363x_regulator_voltage_table_ops,
121                 .n_voltages     = LM3631_CONT_VSEL_MAX + 1,
122                 .min_uV         = LM3631_VCONT_MIN,
123                 .uV_step        = LM363X_STEP_500mV,
124                 .type           = REGULATOR_VOLTAGE,
125                 .owner          = THIS_MODULE,
126                 .vsel_reg       = LM3631_REG_VOUT_CONT,
127                 .vsel_mask      = LM3631_VOUT_CONT_MASK,
128                 .enable_reg     = LM3631_REG_LDO_CTRL2,
129                 .enable_mask    = LM3631_EN_CONT_MASK,
130         },
131         {
132                 .name           = "ldo_oref",
133                 .of_match       = "voref",
134                 .id             = LM3631_LDO_OREF,
135                 .ops            = &lm363x_regulator_voltage_table_ops,
136                 .n_voltages     = LM3631_LDO_VSEL_MAX + 1,
137                 .min_uV         = LM3631_VLDO_MIN,
138                 .uV_step        = LM363X_STEP_50mV,
139                 .type           = REGULATOR_VOLTAGE,
140                 .owner          = THIS_MODULE,
141                 .vsel_reg       = LM3631_REG_VOUT_OREF,
142                 .vsel_mask      = LM3631_VOUT_MASK,
143                 .enable_reg     = LM3631_REG_LDO_CTRL1,
144                 .enable_mask    = LM3631_EN_OREF_MASK,
145         },
146         {
147                 .name           = "ldo_vpos",
148                 .of_match       = "vpos",
149                 .id             = LM3631_LDO_POS,
150                 .ops            = &lm363x_regulator_voltage_table_ops,
151                 .n_voltages     = LM3631_LDO_VSEL_MAX + 1,
152                 .min_uV         = LM3631_VLDO_MIN,
153                 .uV_step        = LM363X_STEP_50mV,
154                 .type           = REGULATOR_VOLTAGE,
155                 .owner          = THIS_MODULE,
156                 .vsel_reg       = LM3631_REG_VOUT_POS,
157                 .vsel_mask      = LM3631_VOUT_MASK,
158                 .enable_reg     = LM3631_REG_LDO_CTRL1,
159                 .enable_mask    = LM3631_EN_VPOS_MASK,
160         },
161         {
162                 .name           = "ldo_vneg",
163                 .of_match       = "vneg",
164                 .id             = LM3631_LDO_NEG,
165                 .ops            = &lm363x_regulator_voltage_table_ops,
166                 .n_voltages     = LM3631_LDO_VSEL_MAX + 1,
167                 .min_uV         = LM3631_VLDO_MIN,
168                 .uV_step        = LM363X_STEP_50mV,
169                 .type           = REGULATOR_VOLTAGE,
170                 .owner          = THIS_MODULE,
171                 .vsel_reg       = LM3631_REG_VOUT_NEG,
172                 .vsel_mask      = LM3631_VOUT_MASK,
173                 .enable_reg     = LM3631_REG_LDO_CTRL1,
174                 .enable_mask    = LM3631_EN_VNEG_MASK,
175         },
176         /* LM3632 */
177         {
178                 .name           = "vboost",
179                 .of_match       = "vboost",
180                 .id             = LM3632_BOOST,
181                 .ops            = &lm363x_boost_voltage_table_ops,
182                 .n_voltages     = LM3632_BOOST_VSEL_MAX + 1,
183                 .min_uV         = LM3632_VBOOST_MIN,
184                 .uV_step        = LM363X_STEP_50mV,
185                 .type           = REGULATOR_VOLTAGE,
186                 .owner          = THIS_MODULE,
187                 .vsel_reg       = LM3632_REG_VOUT_BOOST,
188                 .vsel_mask      = LM3632_VOUT_MASK,
189         },
190         {
191                 .name           = "ldo_vpos",
192                 .of_match       = "vpos",
193                 .id             = LM3632_LDO_POS,
194                 .ops            = &lm363x_regulator_voltage_table_ops,
195                 .n_voltages     = LM3632_LDO_VSEL_MAX + 1,
196                 .min_uV         = LM3632_VLDO_MIN,
197                 .uV_step        = LM363X_STEP_50mV,
198                 .type           = REGULATOR_VOLTAGE,
199                 .owner          = THIS_MODULE,
200                 .vsel_reg       = LM3632_REG_VOUT_POS,
201                 .vsel_mask      = LM3632_VOUT_MASK,
202                 .enable_reg     = LM3632_REG_BIAS_CONFIG,
203                 .enable_mask    = LM3632_EN_VPOS_MASK,
204         },
205         {
206                 .name           = "ldo_vneg",
207                 .of_match       = "vneg",
208                 .id             = LM3632_LDO_NEG,
209                 .ops            = &lm363x_regulator_voltage_table_ops,
210                 .n_voltages     = LM3632_LDO_VSEL_MAX + 1,
211                 .min_uV         = LM3632_VLDO_MIN,
212                 .uV_step        = LM363X_STEP_50mV,
213                 .type           = REGULATOR_VOLTAGE,
214                 .owner          = THIS_MODULE,
215                 .vsel_reg       = LM3632_REG_VOUT_NEG,
216                 .vsel_mask      = LM3632_VOUT_MASK,
217                 .enable_reg     = LM3632_REG_BIAS_CONFIG,
218                 .enable_mask    = LM3632_EN_VNEG_MASK,
219         },
220 };
221
222 static int lm363x_regulator_of_get_enable_gpio(struct device_node *np, int id)
223 {
224         /*
225          * Check LCM_EN1/2_GPIO is configured.
226          * Those pins are used for enabling VPOS/VNEG LDOs.
227          */
228         switch (id) {
229         case LM3632_LDO_POS:
230                 return of_get_named_gpio(np, "ti,lcm-en1-gpio", 0);
231         case LM3632_LDO_NEG:
232                 return of_get_named_gpio(np, "ti,lcm-en2-gpio", 0);
233         default:
234                 return -EINVAL;
235         }
236 }
237
238 static int lm363x_regulator_probe(struct platform_device *pdev)
239 {
240         struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
241         struct regmap *regmap = lmu->regmap;
242         struct regulator_config cfg = { };
243         struct regulator_dev *rdev;
244         struct device *dev = &pdev->dev;
245         int id = pdev->id;
246         int ret, ena_gpio;
247
248         cfg.dev = dev;
249         cfg.regmap = regmap;
250
251         /*
252          * LM3632 LDOs can be controlled by external pin.
253          * Register update is required if the pin is used.
254          */
255         ena_gpio = lm363x_regulator_of_get_enable_gpio(dev->of_node, id);
256         if (gpio_is_valid(ena_gpio)) {
257                 cfg.ena_gpio = ena_gpio;
258                 cfg.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
259
260                 ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
261                                          LM3632_EXT_EN_MASK,
262                                          LM3632_EXT_EN_MASK);
263                 if (ret) {
264                         dev_err(dev, "External pin err: %d\n", ret);
265                         return ret;
266                 }
267         }
268
269         rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
270         if (IS_ERR(rdev)) {
271                 ret = PTR_ERR(rdev);
272                 dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
273                 return ret;
274         }
275
276         return 0;
277 }
278
279 static struct platform_driver lm363x_regulator_driver = {
280         .probe = lm363x_regulator_probe,
281         .driver = {
282                 .name = "lm363x-regulator",
283         },
284 };
285
286 module_platform_driver(lm363x_regulator_driver);
287
288 MODULE_DESCRIPTION("TI LM363X Regulator Driver");
289 MODULE_AUTHOR("Milo Kim");
290 MODULE_LICENSE("GPL v2");
291 MODULE_ALIAS("platform:lm363x-regulator");