[PATCH 08/12] poweroff: Add poweroff-gpio driver

[Sebastian Reichel]

Add GPIO poweroff driver, which is based on the Linux
driver and uses the same DT binding.

Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
 drivers/power/Kconfig         |  8 ++++
 drivers/power/Makefile        |  1 +
 drivers/power/poweroff-gpio.c | 87 +++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 drivers/power/poweroff-gpio.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 5a76e23b5fb0..d1eaa0895ddd 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -382,4 +382,12 @@ config POWEROFF
 	  provide access to board-specific implementations. Using device
 	  tree for configuration is recommended.
 
+config POWEROFF_GPIO
+	bool "GPIO power-off driver"
+	depends on POWEROFF
+	help
+	  This driver supports turning off your board via a GPIO line.
+	  If your board needs a GPIO high/low to power down, say Y and
+	  create a binding in your devicetree.
+
 endmenu
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 924e99114ccd..34a2c2c48195 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_POWER_SPI) += power_spi.o
 obj-$(CONFIG_POWER_MT6323) += mt6323.o
 
 obj-$(CONFIG_POWEROFF) += poweroff-uclass.o
+obj-$(CONFIG_POWEROFF_GPIO) += poweroff-gpio.o
diff --git a/drivers/power/poweroff-gpio.c b/drivers/power/poweroff-gpio.c
new file mode 100644
index 000000000000..cf2bdab9e551
--- /dev/null
+++ b/drivers/power/poweroff-gpio.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Toggles a GPIO pin to power down a device
+ *
+ * Created using the Linux driver as reference, which
+ * has been written by:
+ *
+ * Jamie Lentin <jm at lentin.co.uk>
+ * Andrew Lunn <andrew at lunn.ch>
+ *
+ * Copyright (C) 2012 Jamie Lentin
+ */
+
+#include <common.h>
+#include <asm/gpio.h>
+#include <dm.h>
+#include <errno.h>
+#include <linux/delay.h>
+#include <power/poweroff.h>
+
+struct poweroff_gpio_info {
+	struct gpio_desc gpio;
+	u32 active_delay;
+	u32 inactive_delay;
+	u32 timeout;
+};
+
+static int poweroff_gpio_do_poweroff(struct udevice *dev)
+{
+	struct poweroff_gpio_info *priv = dev_get_priv(dev);
+
+	/* drive it active, also inactive->active edge */
+	dm_gpio_set_value(&priv->gpio, 1);
+	mdelay(priv->active_delay);
+
+	/* drive inactive, also active->inactive edge */
+	dm_gpio_set_value(&priv->gpio, 0);
+	mdelay(priv->inactive_delay);
+
+	/* drive it active, also inactive->active edge */
+	dm_gpio_set_value(&priv->gpio, 1);
+
+	/* give it some time */
+	mdelay(priv->timeout);
+
+	return -ETIMEDOUT;
+}
+
+static int poweroff_gpio_probe(struct udevice *dev)
+{
+	struct poweroff_gpio_info *priv = dev_get_priv(dev);
+	int flags;
+
+	if (dev_read_bool(dev, "input"))
+		flags = GPIOD_IS_IN;
+	else
+		flags = GPIOD_IS_OUT;
+
+	priv->active_delay = 100;
+	dev_read_u32(dev, "active-delay-ms", &priv->active_delay);
+
+	priv->inactive_delay = 100;
+	dev_read_u32(dev, "inactive-delay-ms", &priv->inactive_delay);
+
+	priv->timeout = 3000;
+	dev_read_u32(dev, "timeout-ms", &priv->timeout);
+
+	return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags);
+}
+
+static const struct poweroff_ops poweroff_gpio_ops = {
+	.poweroff = poweroff_gpio_do_poweroff,
+};
+
+static const struct udevice_id poweroff_gpio_ids[] = {
+	{ .compatible = "gpio-poweroff", },
+	{},
+};
+
+U_BOOT_DRIVER(poweroff_gpio) = {
+	.name		= "poweroff-gpio",
+	.id		= UCLASS_POWEROFF,
+	.ops		= &poweroff_gpio_ops,
+	.probe		= poweroff_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct poweroff_gpio_info),
+	.of_match	= poweroff_gpio_ids,
+};
-- 
2.27.0