3 files changed, 138 insertions, 0 deletions
diff --git a/drivers/reboot-mode/Kconfig b/drivers/reboot-mode/Kconfig
index 0edc3209d7..ff65e2031a 100644
--- a/drivers/reboot-mode/Kconfig
+++ b/drivers/reboot-mode/Kconfig
@@ -15,4 +15,13 @@ config DM_REBOOT_MODE
 		adjust the boot process based on reboot mode parameter
 		passed to U-Boot.
 
+config DM_REBOOT_MODE_GPIO
+	bool "Use GPIOs as reboot mode backend"
+	depends on DM_REBOOT_MODE
+	default n
+	help
+		Use GPIOs to control the reboot mode. This will allow users to boot
+		a device in a specific mode by using a GPIO that can be controlled
+		outside U-Boot.
+
 endmenu
diff --git a/drivers/reboot-mode/Makefile b/drivers/reboot-mode/Makefile
index 2ab0fddac9..04917be4f4 100644
--- a/drivers/reboot-mode/Makefile
+++ b/drivers/reboot-mode/Makefile
@@ -5,3 +5,4 @@
 #
 
 obj-$(CONFIG_DM_REBOOT_MODE) += reboot-mode-uclass.o
+obj-$(CONFIG_DM_REBOOT_MODE_GPIO) += reboot-mode-gpio.o
diff --git a/drivers/reboot-mode/reboot-mode-gpio.c b/drivers/reboot-mode/reboot-mode-gpio.c
new file mode 100644
index 0000000000..305174736e
--- /dev/null
+++ b/drivers/reboot-mode/reboot-mode-gpio.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c), Vaisala Oyj
+ */
+
+#include <common.h>
+#include <asm/gpio.h>
+#include <dm.h>
+#include <dm/devres.h>
+#include <errno.h>
+#include <reboot-mode/reboot-mode-gpio.h>
+#include <reboot-mode/reboot-mode.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int reboot_mode_get(struct udevice *dev, u32 *buf)
+{
+	int ret;
+	struct reboot_mode_gpio_platdata *plat_data;
+
+	if (!buf)
+		return -EINVAL;
+
+	plat_data = dev_get_plat(dev);
+	if (!plat_data)
+		return -EINVAL;
+
+	ret = dm_gpio_get_values_as_int(plat_data->gpio_desc,
+					plat_data->gpio_count);
+	if (ret < 0)
+		return ret;
+
+	*buf = ret;
+
+	return 0;
+}
+
+static int reboot_mode_probe(struct udevice *dev)
+{
+	struct reboot_mode_gpio_platdata *plat_data;
+
+	plat_data = dev_get_plat(dev);
+	if (!plat_data)
+		return -EINVAL;
+
+	int ret;
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	ret = gpio_get_list_count(dev, "gpios");
+	if (ret < 0)
+		return ret;
+
+	plat_data->gpio_count = ret;
+#endif
+
+	if (plat_data->gpio_count <= 0)
+		return -EINVAL;
+
+	plat_data->gpio_desc = devm_kcalloc(dev, plat_data->gpio_count,
+					    sizeof(struct gpio_desc), 0);
+	if (!plat_data->gpio_desc)
+		return -ENOMEM;
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	ret = gpio_request_list_by_name(dev, "gpios", plat_data->gpio_desc,
+					plat_data->gpio_count, GPIOD_IS_IN);
+	if (ret < 0)
+		return ret;
+#else
+	for (int i = 0; i < plat_data->gpio_count; i++) {
+		struct reboot_mode_gpio_config *gpio =
+			plat_data->gpios_config + i;
+		struct gpio_desc *desc = plat_data->gpio_desc + i;
+
+		ret = uclass_get_device_by_seq(UCLASS_GPIO,
+					       gpio->gpio_dev_offset,
+					       &desc->dev);
+		if (ret < 0)
+			return ret;
+
+		desc->flags = gpio->flags;
+		desc->offset = gpio->gpio_offset;
+
+		ret = dm_gpio_request(desc, "");
+		if (ret < 0)
+			return ret;
+
+		ret = dm_gpio_set_dir(desc);
+		if (ret < 0)
+			return ret;
+	}
+#endif
+	return 0;
+}
+
+static int reboot_mode_remove(struct udevice *dev)
+{
+	struct reboot_mode_gpio_platdata *plat_data;
+
+	plat_data = dev_get_plat(dev);
+	if (!plat_data)
+		return -EINVAL;
+
+	return gpio_free_list(dev, plat_data->gpio_desc, plat_data->gpio_count);
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static const struct udevice_id reboot_mode_ids[] = {
+	{ .compatible = "reboot-mode-gpio", 0 },
+	{ }
+};
+#endif
+
+static const struct reboot_mode_ops reboot_mode_gpio_ops = {
+	.get = reboot_mode_get,
+};
+
+U_BOOT_DRIVER(reboot_mode_gpio) = {
+	.name = "reboot-mode-gpio",
+	.id = UCLASS_REBOOT_MODE,
+	.probe = reboot_mode_probe,
+	.remove = reboot_mode_remove,
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	.of_match = reboot_mode_ids,
+#endif
+	.plat_auto = sizeof(struct reboot_mode_gpio_platdata),
+	.ops = &reboot_mode_gpio_ops,
+};