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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         .get_bypass = regulator_get_bypass_regmap,
147         .set_bypass = regulator_set_bypass_regmap,
148 };
149 
150 static const struct regulator_desc arizona_ldo1 = {
151         .name = "LDO1",
152         .supply_name = "LDOVDD",
153         .type = REGULATOR_VOLTAGE,
154         .ops = &arizona_ldo1_ops,
155 
156         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
157         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
158         .min_uV = 900000,
159         .uV_step = 25000,
160         .n_voltages = 13,
161         .enable_time = 500,
162 
163         .owner = THIS_MODULE,
164 };
165 
166 static const struct regulator_init_data arizona_ldo1_dvfs = {
167         .constraints = {
168                 .min_uV = 1200000,
169                 .max_uV = 1800000,
170                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
171                                   REGULATOR_CHANGE_VOLTAGE,
172         },
173         .num_consumer_supplies = 1,
174 };
175 
176 static const struct regulator_init_data arizona_ldo1_default = {
177         .constraints = {
178                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
179         },
180         .num_consumer_supplies = 1,
181 };
182 
183 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
184                                      struct regulator_config *config)
185 {
186         struct arizona_pdata *pdata = &arizona->pdata;
187         struct arizona_ldo1 *ldo1 = config->driver_data;
188         struct device_node *init_node, *dcvdd_node;
189         struct regulator_init_data *init_data;
190 
191         pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true);
192 
193         init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1");
194         dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0);
195 
196         if (init_node) {
197                 config->of_node = init_node;
198 
199                 init_data = of_get_regulator_init_data(arizona->dev, init_node);
200 
201                 if (init_data) {
202                         init_data->consumer_supplies = &ldo1->supply;
203                         init_data->num_consumer_supplies = 1;
204 
205                         if (dcvdd_node && dcvdd_node != init_node)
206                                 arizona->external_dcvdd = true;
207 
208                         pdata->ldo1 = init_data;
209                 }
210         } else if (dcvdd_node) {
211                 arizona->external_dcvdd = true;
212         }
213 
214         of_node_put(dcvdd_node);
215 
216         return 0;
217 }
218 
219 static int arizona_ldo1_probe(struct platform_device *pdev)
220 {
221         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
222         const struct regulator_desc *desc;
223         struct regulator_config config = { };
224         struct arizona_ldo1 *ldo1;
225         int ret;
226 
227         arizona->external_dcvdd = false;
228 
229         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
230         if (!ldo1)
231                 return -ENOMEM;
232 
233         ldo1->arizona = arizona;
234 
235         /*
236          * Since the chip usually supplies itself we provide some
237          * default init_data for it.  This will be overridden with
238          * platform data if provided.
239          */
240         switch (arizona->type) {
241         case WM5102:
242         case WM8997:
243                 desc = &arizona_ldo1_hc;
244                 ldo1->init_data = arizona_ldo1_dvfs;
245                 break;
246         default:
247                 desc = &arizona_ldo1;
248                 ldo1->init_data = arizona_ldo1_default;
249                 break;
250         }
251 
252         ldo1->init_data.consumer_supplies = &ldo1->supply;
253         ldo1->supply.supply = "DCVDD";
254         ldo1->supply.dev_name = dev_name(arizona->dev);
255 
256         config.dev = arizona->dev;
257         config.driver_data = ldo1;
258         config.regmap = arizona->regmap;
259 
260         if (IS_ENABLED(CONFIG_OF)) {
261                 if (!dev_get_platdata(arizona->dev)) {
262                         ret = arizona_ldo1_of_get_pdata(arizona, &config);
263                         if (ret < 0)
264                                 return ret;
265                 }
266         }
267 
268         config.ena_gpio = arizona->pdata.ldoena;
269 
270         if (arizona->pdata.ldo1)
271                 config.init_data = arizona->pdata.ldo1;
272         else
273                 config.init_data = &ldo1->init_data;
274 
275         /*
276          * LDO1 can only be used to supply DCVDD so if it has no
277          * consumers then DCVDD is supplied externally.
278          */
279         if (config.init_data->num_consumer_supplies == 0)
280                 arizona->external_dcvdd = true;
281 
282         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
283         if (IS_ERR(ldo1->regulator)) {
284                 ret = PTR_ERR(ldo1->regulator);
285                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
286                         ret);
287                 return ret;
288         }
289 
290         of_node_put(config.of_node);
291 
292         platform_set_drvdata(pdev, ldo1);
293 
294         return 0;
295 }
296 
297 static struct platform_driver arizona_ldo1_driver = {
298         .probe = arizona_ldo1_probe,
299         .driver         = {
300                 .name   = "arizona-ldo1",
301                 .owner  = THIS_MODULE,
302         },
303 };
304 
305 module_platform_driver(arizona_ldo1_driver);
306 
307 /* Module information */
308 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
309 MODULE_DESCRIPTION("Arizona LDO1 driver");
310 MODULE_LICENSE("GPL");
311 MODULE_ALIAS("platform:arizona-ldo1");
312 

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