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