git.sur5r.net Git - u-boot/blob - drivers/power/regulator/fixed.c

   1 /*
   2  *  Copyright (C) 2015 Samsung Electronics
   3  *
   4  *  Przemyslaw Marczak <p.marczak@samsung.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <fdtdec.h>
  11 #include <errno.h>
  12 #include <dm.h>
  13 #include <i2c.h>
  14 #include <asm/gpio.h>
  15 #include <power/pmic.h>
  16 #include <power/regulator.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 struct fixed_regulator_platdata {
  21         struct gpio_desc gpio; /* GPIO for regulator enable control */
  22         unsigned int startup_delay_us;
  23 };
  24
  25 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
  26 {
  27         struct dm_regulator_uclass_platdata *uc_pdata;
  28         struct fixed_regulator_platdata *dev_pdata;
  29         struct gpio_desc *gpio;
  30         int ret;
  31
  32         dev_pdata = dev_get_platdata(dev);
  33         uc_pdata = dev_get_uclass_platdata(dev);
  34         if (!uc_pdata)
  35                 return -ENXIO;
  36
  37         /* Set type to fixed */
  38         uc_pdata->type = REGULATOR_TYPE_FIXED;
  39
  40         /* Get fixed regulator gpio desc */
  41         gpio = &dev_pdata->gpio;
  42         ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT);
  43         if (ret)
  44                 debug("Fixed regulator gpio - not found! Error: %d", ret);
  45
  46         /* Get optional ramp up delay */
  47         dev_pdata->startup_delay_us = fdtdec_get_uint(gd->fdt_blob,
  48                                                       dev->of_offset,
  49                                                       "startup-delay-us", 0);
  50
  51         return 0;
  52 }
  53
  54 static int fixed_regulator_get_value(struct udevice *dev)
  55 {
  56         struct dm_regulator_uclass_platdata *uc_pdata;
  57
  58         uc_pdata = dev_get_uclass_platdata(dev);
  59         if (!uc_pdata)
  60                 return -ENXIO;
  61
  62         if (uc_pdata->min_uV != uc_pdata->max_uV) {
  63                 debug("Invalid constraints for: %s\n", uc_pdata->name);
  64                 return -EINVAL;
  65         }
  66
  67         return uc_pdata->min_uV;
  68 }
  69
  70 static int fixed_regulator_get_current(struct udevice *dev)
  71 {
  72         struct dm_regulator_uclass_platdata *uc_pdata;
  73
  74         uc_pdata = dev_get_uclass_platdata(dev);
  75         if (!uc_pdata)
  76                 return -ENXIO;
  77
  78         if (uc_pdata->min_uA != uc_pdata->max_uA) {
  79                 debug("Invalid constraints for: %s\n", uc_pdata->name);
  80                 return -EINVAL;
  81         }
  82
  83         return uc_pdata->min_uA;
  84 }
  85
  86 static bool fixed_regulator_get_enable(struct udevice *dev)
  87 {
  88         struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
  89
  90         if (!dev_pdata->gpio.dev)
  91                 return false;
  92
  93         return dm_gpio_get_value(&dev_pdata->gpio);
  94 }
  95
  96 static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
  97 {
  98         struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
  99         int ret;
 100
 101         if (!dev_pdata->gpio.dev)
 102                 return -ENOSYS;
 103
 104         ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
 105         if (ret) {
 106                 error("Can't set regulator : %s gpio to: %d\n", dev->name,
 107                       enable);
 108                 return ret;
 109         }
 110
 111         if (enable && dev_pdata->startup_delay_us)
 112                 udelay(dev_pdata->startup_delay_us);
 113
 114         return 0;
 115 }
 116
 117 static const struct dm_regulator_ops fixed_regulator_ops = {
 118         .get_value      = fixed_regulator_get_value,
 119         .get_current    = fixed_regulator_get_current,
 120         .get_enable     = fixed_regulator_get_enable,
 121         .set_enable     = fixed_regulator_set_enable,
 122 };
 123
 124 static const struct udevice_id fixed_regulator_ids[] = {
 125         { .compatible = "regulator-fixed" },
 126         { },
 127 };
 128
 129 U_BOOT_DRIVER(fixed_regulator) = {
 130         .name = "fixed regulator",
 131         .id = UCLASS_REGULATOR,
 132         .ops = &fixed_regulator_ops,
 133         .of_match = fixed_regulator_ids,
 134         .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
 135         .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
 136 };