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");