LXR uboot/drivers/power/regulator/fixed.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 *  Copyright (C) 2015 Samsung Electronics
   4 *
   5 *  Przemyslaw Marczak <p.marczak@samsung.com>
   6 */
   7
   8#include <common.h>
   9#include <errno.h>
  10#include <dm.h>
  11#include <i2c.h>
  12#include <asm/gpio.h>
  13#include <power/pmic.h>
  14#include <power/regulator.h>
  15
  16struct fixed_regulator_platdata {
  17        struct gpio_desc gpio; /* GPIO for regulator enable control */
  18        unsigned int startup_delay_us;
  19};
  20
  21static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
  22{
  23        struct dm_regulator_uclass_platdata *uc_pdata;
  24        struct fixed_regulator_platdata *dev_pdata;
  25        struct gpio_desc *gpio;
  26        int flags = GPIOD_IS_OUT;
  27        int ret;
  28
  29        dev_pdata = dev_get_platdata(dev);
  30        uc_pdata = dev_get_uclass_platdata(dev);
  31        if (!uc_pdata)
  32                return -ENXIO;
  33
  34        /* Set type to fixed */
  35        uc_pdata->type = REGULATOR_TYPE_FIXED;
  36
  37        if (dev_read_bool(dev, "enable-active-high"))
  38                flags |= GPIOD_IS_OUT_ACTIVE;
  39
  40        /* Get fixed regulator optional enable GPIO desc */
  41        gpio = &dev_pdata->gpio;
  42        ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
  43        if (ret) {
  44                debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
  45                      ret);
  46                if (ret != -ENOENT)
  47                        return ret;
  48        }
  49
  50        /* Get optional ramp up delay */
  51        dev_pdata->startup_delay_us = dev_read_u32_default(dev,
  52                                                        "startup-delay-us", 0);
  53
  54        return 0;
  55}
  56
  57static int fixed_regulator_get_value(struct udevice *dev)
  58{
  59        struct dm_regulator_uclass_platdata *uc_pdata;
  60
  61        uc_pdata = dev_get_uclass_platdata(dev);
  62        if (!uc_pdata)
  63                return -ENXIO;
  64
  65        if (uc_pdata->min_uV != uc_pdata->max_uV) {
  66                debug("Invalid constraints for: %s\n", uc_pdata->name);
  67                return -EINVAL;
  68        }
  69
  70        return uc_pdata->min_uV;
  71}
  72
  73static int fixed_regulator_get_current(struct udevice *dev)
  74{
  75        struct dm_regulator_uclass_platdata *uc_pdata;
  76
  77        uc_pdata = dev_get_uclass_platdata(dev);
  78        if (!uc_pdata)
  79                return -ENXIO;
  80
  81        if (uc_pdata->min_uA != uc_pdata->max_uA) {
  82                debug("Invalid constraints for: %s\n", uc_pdata->name);
  83                return -EINVAL;
  84        }
  85
  86        return uc_pdata->min_uA;
  87}
  88
  89static int fixed_regulator_get_enable(struct udevice *dev)
  90{
  91        struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
  92
  93        /* Enable GPIO is optional */
  94        if (!dev_pdata->gpio.dev)
  95                return true;
  96
  97        return dm_gpio_get_value(&dev_pdata->gpio);
  98}
  99
 100static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
 101{
 102        struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
 103        int ret;
 104
 105        debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
 106              dev->name, enable, dev_pdata->startup_delay_us,
 107              dm_gpio_is_valid(&dev_pdata->gpio));
 108        /* Enable GPIO is optional */
 109        if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
 110                if (!enable)
 111                        return -ENOSYS;
 112                return 0;
 113        }
 114
 115        ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
 116        if (ret) {
 117                pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
 118                      enable);
 119                return ret;
 120        }
 121
 122        if (enable && dev_pdata->startup_delay_us)
 123                udelay(dev_pdata->startup_delay_us);
 124        debug("%s: done\n", __func__);
 125
 126        return 0;
 127}
 128
 129static const struct dm_regulator_ops fixed_regulator_ops = {
 130        .get_value      = fixed_regulator_get_value,
 131        .get_current    = fixed_regulator_get_current,
 132        .get_enable     = fixed_regulator_get_enable,
 133        .set_enable     = fixed_regulator_set_enable,
 134};
 135
 136static const struct udevice_id fixed_regulator_ids[] = {
 137        { .compatible = "regulator-fixed" },
 138        { },
 139};
 140
 141U_BOOT_DRIVER(fixed_regulator) = {
 142        .name = "fixed regulator",
 143        .id = UCLASS_REGULATOR,
 144        .ops = &fixed_regulator_ops,
 145        .of_match = fixed_regulator_ids,
 146        .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
 147        .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
 148};
 149