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@@ -0,0 +1,92 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Toggles a GPIO pin to power down a device
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+ *
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+ * Created using the Linux driver as reference, which
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+ * has been written by:
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+ *
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+ * Jamie Lentin <jm@lentin.co.uk>
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+ * Andrew Lunn <andrew@lunn.ch>
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+ *
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+ * Copyright (C) 2012 Jamie Lentin
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+ */
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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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+
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+#include <asm/gpio.h>
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+#include <linux/delay.h>
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+
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+struct poweroff_gpio_info {
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+ struct gpio_desc gpio;
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+ u32 active_delay_ms;
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+ u32 inactive_delay_ms;
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+ u32 timeout_ms;
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+};
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+
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+static int poweroff_gpio_request(struct udevice *dev, enum sysreset_t type)
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+{
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+ struct poweroff_gpio_info *priv = dev_get_priv(dev);
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+ int r;
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+
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+ if (type != SYSRESET_POWER_OFF)
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+ return -ENOSYS;
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+
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+ debug("GPIO poweroff\n");
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+
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+ /* drive it active, also inactive->active edge */
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+ r = dm_gpio_set_value(&priv->gpio, 1);
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+ if (r < 0)
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+ return r;
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+ mdelay(priv->active_delay_ms);
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+
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+ /* drive inactive, also active->inactive edge */
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+ r = dm_gpio_set_value(&priv->gpio, 0);
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+ if (r < 0)
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+ return r;
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+ mdelay(priv->inactive_delay_ms);
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+
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+ /* drive it active, also inactive->active edge */
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+ r = dm_gpio_set_value(&priv->gpio, 1);
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+ if (r < 0)
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+ return r;
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+
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+ /* give it some time */
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+ mdelay(priv->timeout_ms);
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+
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+ return -EINPROGRESS;
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+}
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+
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+static int poweroff_gpio_probe(struct udevice *dev)
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+{
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+ struct poweroff_gpio_info *priv = dev_get_priv(dev);
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+ int flags;
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+
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+ flags = dev_read_bool(dev, "input") ? GPIOD_IS_IN : GPIOD_IS_OUT;
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+ priv->active_delay_ms = dev_read_u32_default(dev, "active-delay-ms", 100);
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+ priv->inactive_delay_ms = dev_read_u32_default(dev, "inactive-delay-ms", 100);
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+ priv->timeout_ms = dev_read_u32_default(dev, "timeout-ms", 3000);
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+
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+ return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags);
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+}
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+
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+static struct sysreset_ops poweroff_gpio_ops = {
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+ .request = poweroff_gpio_request,
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+};
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+
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+static const struct udevice_id poweroff_gpio_ids[] = {
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+ { .compatible = "gpio-poweroff", },
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+ {},
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+};
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+
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+U_BOOT_DRIVER(poweroff_gpio) = {
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+ .name = "poweroff-gpio",
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+ .id = UCLASS_SYSRESET,
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+ .ops = &poweroff_gpio_ops,
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+ .probe = poweroff_gpio_probe,
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+ .priv_auto_alloc_size = sizeof(struct poweroff_gpio_info),
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+ .of_match = poweroff_gpio_ids,
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+};
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