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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Xilinx, Inc. - Michal Simek
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <sysreset.h>
#include <asm/gpio.h>
struct gpio_reboot_priv {
struct gpio_desc gpio;
};
static int gpio_reboot_request(struct udevice *dev, enum sysreset_t type)
{
struct gpio_reboot_priv *priv = dev_get_priv(dev);
int ret;
/*
* When debug log is enabled please make sure that chars won't end up
* in output fifo. Or you can append udelay(); to get enough time
* to HW to emit output fifo.
*/
debug("GPIO reset\n");
/* Writing 1 respects polarity (active high/low) based on gpio->flags */
ret = dm_gpio_set_value(&priv->gpio, 1);
if (ret < 0)
return ret;
return -EINPROGRESS;
}
static struct sysreset_ops gpio_reboot_ops = {
.request = gpio_reboot_request,
};
static int gpio_reboot_probe(struct udevice *dev)
{
struct gpio_reboot_priv *priv = dev_get_priv(dev);
/*
* Linux kernel DT binding contain others optional properties
* which are not supported now
*/
return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
}
static const struct udevice_id led_gpio_ids[] = {
{ .compatible = "gpio-restart" },
{ }
};
U_BOOT_DRIVER(gpio_reboot) = {
.id = UCLASS_SYSRESET,
.name = "gpio_restart",
.of_match = led_gpio_ids,
.ops = &gpio_reboot_ops,
.priv_auto = sizeof(struct gpio_reboot_priv),
.probe = gpio_reboot_probe,
};
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