mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 16:39:35 +00:00
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// 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);
|
|
|
|
/*
|
|
* 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 */
|
|
return dm_gpio_set_value(&priv->gpio, 1);
|
|
}
|
|
|
|
static struct sysreset_ops gpio_reboot_ops = {
|
|
.request = gpio_reboot_request,
|
|
};
|
|
|
|
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_alloc_size = sizeof(struct gpio_reboot_priv),
|
|
.probe = gpio_reboot_probe,
|
|
};
|