Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/regulator/arizona-ldo1.c

  1 /*
  2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
  3  *
  4  * Copyright 2012 Wolfson Microelectronics PLC.
  5  *
  6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  7  *
  8  *  This program is free software; you can redistribute  it and/or modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/moduleparam.h>
 16 #include <linux/init.h>
 17 #include <linux/bitops.h>
 18 #include <linux/err.h>
 19 #include <linux/of.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/regulator/driver.h>
 22 #include <linux/regulator/machine.h>
 23 #include <linux/regulator/of_regulator.h>
 24 #include <linux/gpio.h>
 25 #include <linux/slab.h>
 26 
 27 #include <linux/mfd/arizona/core.h>
 28 #include <linux/mfd/arizona/pdata.h>
 29 #include <linux/mfd/arizona/registers.h>
 30 
 31 struct arizona_ldo1 {
 32         struct regulator_dev *regulator;
 33         struct arizona *arizona;
 34 
 35         struct regulator_consumer_supply supply;
 36         struct regulator_init_data init_data;
 37 };
 38 
 39 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
 40                                         unsigned int selector)
 41 {
 42         if (selector >= rdev->desc->n_voltages)
 43                 return -EINVAL;
 44 
 45         if (selector == rdev->desc->n_voltages - 1)
 46                 return 1800000;
 47         else
 48                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
 49 }
 50 
 51 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
 52                                        int min_uV, int max_uV)
 53 {
 54         int sel;
 55 
 56         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
 57         if (sel >= rdev->desc->n_voltages)
 58                 sel = rdev->desc->n_voltages - 1;
 59 
 60         return sel;
 61 }
 62 
 63 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
 64                                            unsigned sel)
 65 {
 66         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
 67         struct regmap *regmap = ldo->arizona->regmap;
 68         unsigned int val;
 69         int ret;
 70 
 71         if (sel == rdev->desc->n_voltages - 1)
 72                 val = ARIZONA_LDO1_HI_PWR;
 73         else
 74                 val = 0;
 75 
 76         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
 77                                  ARIZONA_LDO1_HI_PWR, val);
 78         if (ret != 0)
 79                 return ret;
 80 
 81         ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
 82                                  ARIZONA_SUBSYS_MAX_FREQ, val);
 83         if (ret != 0)
 84                 return ret;
 85 
 86         if (val)
 87                 return 0;
 88 
 89         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
 90 
 91         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
 92                                   ARIZONA_LDO1_VSEL_MASK, val);
 93 }
 94 
 95 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
 96 {
 97         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
 98         struct regmap *regmap = ldo->arizona->regmap;
 99         unsigned int val;
100         int ret;
101 
102         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
103         if (ret != 0)
104                 return ret;
105 
106         if (val & ARIZONA_LDO1_HI_PWR)
107                 return rdev->desc->n_voltages - 1;
108 
109         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
110         if (ret != 0)
111                 return ret;
112 
113         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
114 }
115 
116 static struct regulator_ops arizona_ldo1_hc_ops = {
117         .list_voltage = arizona_ldo1_hc_list_voltage,
118         .map_voltage = arizona_ldo1_hc_map_voltage,
119         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
120         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
121         .get_bypass = regulator_get_bypass_regmap,
122         .set_bypass = regulator_set_bypass_regmap,
123 };
124 
125 static const struct regulator_desc arizona_ldo1_hc = {
126         .name = "LDO1",
127         .supply_name = "LDOVDD",
128         .type = REGULATOR_VOLTAGE,
129         .ops = &arizona_ldo1_hc_ops,
130 
131         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
132         .bypass_mask = ARIZONA_LDO1_BYPASS,
133         .min_uV = 900000,
134         .uV_step = 50000,
135         .n_voltages = 8,
136         .enable_time = 1500,
137 
138         .owner = THIS_MODULE,
139 };
140 
141 static struct regulator_ops arizona_ldo1_ops = {
142         .list_voltage = regulator_list_voltage_linear,
143         .map_voltage = regulator_map_voltage_linear,
144         .get_voltage_sel = regulator_get_voltage_sel_regmap,
145         .set_voltage_sel = regulator_set_voltage_sel_regmap,
146 };
147 
148 static const struct regulator_desc arizona_ldo1 = {
149         .name = "LDO1",
150         .supply_name = "LDOVDD",
151         .type = REGULATOR_VOLTAGE,
152         .ops = &arizona_ldo1_ops,
153 
154         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
155         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
156         .min_uV = 900000,
157         .uV_step = 25000,
158         .n_voltages = 13,
159         .enable_time = 500,
160 
161         .owner = THIS_MODULE,
162 };
163 
164 static const struct regulator_init_data arizona_ldo1_dvfs = {
165         .constraints = {
166                 .min_uV = 1200000,
167                 .max_uV = 1800000,
168                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
169                                   REGULATOR_CHANGE_VOLTAGE,
170         },
171         .num_consumer_supplies = 1,
172 };
173 
174 static const struct regulator_init_data arizona_ldo1_default = {
175         .constraints = {
176                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
177         },
178         .num_consumer_supplies = 1,
179 };
180 
181 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
182                                      struct regulator_config *config)
183 {
184         struct arizona_pdata *pdata = &arizona->pdata;
185         struct arizona_ldo1 *ldo1 = config->driver_data;
186         struct device_node *init_node, *dcvdd_node;
187         struct regulator_init_data *init_data;
188 
189         pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true);
190 
191         init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1");
192         dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0);
193 
194         if (init_node) {
195                 config->of_node = init_node;
196 
197                 init_data = of_get_regulator_init_data(arizona->dev, init_node);
198 
199                 if (init_data) {
200                         init_data->consumer_supplies = &ldo1->supply;
201                         init_data->num_consumer_supplies = 1;
202 
203                         if (dcvdd_node && dcvdd_node != init_node)
204                                 arizona->external_dcvdd = true;
205 
206                         pdata->ldo1 = init_data;
207                 }
208         } else if (dcvdd_node) {
209                 arizona->external_dcvdd = true;
210         }
211 
212         of_node_put(dcvdd_node);
213 
214         return 0;
215 }
216 
217 static int arizona_ldo1_probe(struct platform_device *pdev)
218 {
219         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
220         const struct regulator_desc *desc;
221         struct regulator_config config = { };
222         struct arizona_ldo1 *ldo1;
223         int ret;
224 
225         arizona->external_dcvdd = false;
226 
227         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
228         if (!ldo1)
229                 return -ENOMEM;
230 
231         ldo1->arizona = arizona;
232 
233         /*
234          * Since the chip usually supplies itself we provide some
235          * default init_data for it.  This will be overridden with
236          * platform data if provided.
237          */
238         switch (arizona->type) {
239         case WM5102:
240         case WM8997:
241                 desc = &arizona_ldo1_hc;
242                 ldo1->init_data = arizona_ldo1_dvfs;
243                 break;
244         default:
245                 desc = &arizona_ldo1;
246                 ldo1->init_data = arizona_ldo1_default;
247                 break;
248         }
249 
250         ldo1->init_data.consumer_supplies = &ldo1->supply;
251         ldo1->supply.supply = "DCVDD";
252         ldo1->supply.dev_name = dev_name(arizona->dev);
253 
254         config.dev = arizona->dev;
255         config.driver_data = ldo1;
256         config.regmap = arizona->regmap;
257 
258         if (IS_ENABLED(CONFIG_OF)) {
259                 if (!dev_get_platdata(arizona->dev)) {
260                         ret = arizona_ldo1_of_get_pdata(arizona, &config);
261                         if (ret < 0)
262                                 return ret;
263                 }
264         }
265 
266         config.ena_gpio = arizona->pdata.ldoena;
267 
268         if (arizona->pdata.ldo1)
269                 config.init_data = arizona->pdata.ldo1;
270         else
271                 config.init_data = &ldo1->init_data;
272 
273         /*
274          * LDO1 can only be used to supply DCVDD so if it has no
275          * consumers then DCVDD is supplied externally.
276          */
277         if (config.init_data->num_consumer_supplies == 0)
278                 arizona->external_dcvdd = true;
279 
280         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
281         if (IS_ERR(ldo1->regulator)) {
282                 ret = PTR_ERR(ldo1->regulator);
283                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
284                         ret);
285                 return ret;
286         }
287 
288         of_node_put(config.of_node);
289 
290         platform_set_drvdata(pdev, ldo1);
291 
292         return 0;
293 }
294 
295 static struct platform_driver arizona_ldo1_driver = {
296         .probe = arizona_ldo1_probe,
297         .driver         = {
298                 .name   = "arizona-ldo1",
299                 .owner  = THIS_MODULE,
300         },
301 };
302 
303 module_platform_driver(arizona_ldo1_driver);
304 
305 /* Module information */
306 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
307 MODULE_DESCRIPTION("Arizona LDO1 driver");
308 MODULE_LICENSE("GPL");
309 MODULE_ALIAS("platform:arizona-ldo1");
310 

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