mirror of
https://github.com/AsahiLinux/u-boot
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69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <wdt.h>
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#include <asm/gpio.h>
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struct gpio_wdt_priv {
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struct gpio_desc gpio;
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bool always_running;
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int state;
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};
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static int gpio_wdt_reset(struct udevice *dev)
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{
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struct gpio_wdt_priv *priv = dev_get_priv(dev);
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priv->state = !priv->state;
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return dm_gpio_set_value(&priv->gpio, priv->state);
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}
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static int gpio_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct gpio_wdt_priv *priv = dev_get_priv(dev);
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if (priv->always_running)
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return 0;
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return -ENOSYS;
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}
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static int dm_probe(struct udevice *dev)
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{
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struct gpio_wdt_priv *priv = dev_get_priv(dev);
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int ret;
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priv->always_running = dev_read_bool(dev, "always-running");
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ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
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if (ret < 0) {
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dev_err(dev, "Request for wdt gpio failed: %d\n", ret);
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return ret;
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}
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if (priv->always_running)
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ret = gpio_wdt_reset(dev);
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return ret;
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}
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static const struct wdt_ops gpio_wdt_ops = {
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.start = gpio_wdt_start,
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.reset = gpio_wdt_reset,
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};
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static const struct udevice_id gpio_wdt_ids[] = {
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{ .compatible = "linux,wdt-gpio" },
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{}
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};
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U_BOOT_DRIVER(wdt_gpio) = {
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.name = "wdt_gpio",
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.id = UCLASS_WDT,
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.of_match = gpio_wdt_ids,
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.ops = &gpio_wdt_ops,
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.probe = dm_probe,
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.priv_auto = sizeof(struct gpio_wdt_priv),
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};
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