Add GPIO poweroff driver, which is based on the Linux
driver and uses the same DT binding.
Signed-off-by: Sebastian Reichel <sebastian.reic...@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 <j...@lentin.co.uk>
+ * Andrew Lunn <and...@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
