[PATCHv3 06/10] sysreset: Add poweroff-gpio driver
Sebastian Reichel
sebastian.reichel at collabora.com
Fri Aug 21 18:16:20 CEST 2020
Add GPIO poweroff driver, which is based on the Linux
driver and uses the same DT binding.
Reviewed-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
drivers/sysreset/Kconfig | 7 +++
drivers/sysreset/Makefile | 1 +
drivers/sysreset/poweroff_gpio.c | 92 ++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+)
create mode 100644 drivers/sysreset/poweroff_gpio.c
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index 6ebc90e1d33b..bf042f32c848 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -43,6 +43,13 @@ config SYSRESET_CMD_POWEROFF
endif
+config POWEROFF_GPIO
+ bool "Enable support for GPIO poweroff driver"
+ select DM_GPIO
+ help
+ Support for system poweroff using a GPIO pin. This can be used
+ for systems having a single GPIO to trigger a system poweroff.
+
config SYSRESET_GPIO
bool "Enable support for GPIO reset driver"
select DM_GPIO
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index df2293b8489d..90a9b26abef4 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_ASPEED) += sysreset_ast.o
obj-$(CONFIG_ARCH_ROCKCHIP) += sysreset_rockchip.o
obj-$(CONFIG_ARCH_STI) += sysreset_sti.o
obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o
+obj-$(CONFIG_POWEROFF_GPIO) += poweroff_gpio.o
obj-$(CONFIG_SYSRESET_GPIO) += sysreset_gpio.o
obj-$(CONFIG_SYSRESET_MPC83XX) += sysreset_mpc83xx.o
obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o
diff --git a/drivers/sysreset/poweroff_gpio.c b/drivers/sysreset/poweroff_gpio.c
new file mode 100644
index 000000000000..ac482c37f48f
--- /dev/null
+++ b/drivers/sysreset/poweroff_gpio.c
@@ -0,0 +1,92 @@
+// 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 <dm.h>
+#include <errno.h>
+#include <log.h>
+#include <sysreset.h>
+
+#include <asm/gpio.h>
+#include <linux/delay.h>
+
+struct poweroff_gpio_info {
+ struct gpio_desc gpio;
+ u32 active_delay_ms;
+ u32 inactive_delay_ms;
+ u32 timeout_ms;
+};
+
+static int poweroff_gpio_request(struct udevice *dev, enum sysreset_t type)
+{
+ struct poweroff_gpio_info *priv = dev_get_priv(dev);
+ int r;
+
+ if (type != SYSRESET_POWER_OFF)
+ return -ENOSYS;
+
+ debug("GPIO poweroff\n");
+
+ /* drive it active, also inactive->active edge */
+ r = dm_gpio_set_value(&priv->gpio, 1);
+ if (r < 0)
+ return r;
+ mdelay(priv->active_delay_ms);
+
+ /* drive inactive, also active->inactive edge */
+ r = dm_gpio_set_value(&priv->gpio, 0);
+ if (r < 0)
+ return r;
+ mdelay(priv->inactive_delay_ms);
+
+ /* drive it active, also inactive->active edge */
+ r = dm_gpio_set_value(&priv->gpio, 1);
+ if (r < 0)
+ return r;
+
+ /* give it some time */
+ mdelay(priv->timeout_ms);
+
+ return -EINPROGRESS;
+}
+
+static int poweroff_gpio_probe(struct udevice *dev)
+{
+ struct poweroff_gpio_info *priv = dev_get_priv(dev);
+ int flags;
+
+ flags = dev_read_bool(dev, "input") ? GPIOD_IS_IN : GPIOD_IS_OUT;
+ priv->active_delay_ms = dev_read_u32_default(dev, "active-delay-ms", 100);
+ priv->inactive_delay_ms = dev_read_u32_default(dev, "inactive-delay-ms", 100);
+ priv->timeout_ms = dev_read_u32_default(dev, "timeout-ms", 3000);
+
+ return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags);
+}
+
+static struct sysreset_ops poweroff_gpio_ops = {
+ .request = poweroff_gpio_request,
+};
+
+static const struct udevice_id poweroff_gpio_ids[] = {
+ { .compatible = "gpio-poweroff", },
+ {},
+};
+
+U_BOOT_DRIVER(poweroff_gpio) = {
+ .name = "poweroff-gpio",
+ .id = UCLASS_SYSRESET,
+ .ops = &poweroff_gpio_ops,
+ .probe = poweroff_gpio_probe,
+ .priv_auto_alloc_size = sizeof(struct poweroff_gpio_info),
+ .of_match = poweroff_gpio_ids,
+};
--
2.28.0
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