[PATCH 2/2] power: reset: gpio-poweroff: Add support for timeout from DT
From: Moritz Fischer <moritz.fischer@ettus.com>
Date: 2018-02-15 20:54:42
Also in:
linux-pm, lkml
Subsystem:
system reset/shutdown drivers, the rest · Maintainers:
Sebastian Reichel, Linus Torvalds
From: Moritz Fischer <mdf@kernel.org> Add support for reading a timeout value from devicetree. Fall back to previous default of 3s if nothing is specified. Signed-off-by: Moritz Fischer <mdf@kernel.org> --- drivers/power/reset/gpio-poweroff.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
index be3d81ff51cc..bc9fad17d22a 100644
--- a/drivers/power/reset/gpio-poweroff.c
+++ b/drivers/power/reset/gpio-poweroff.c@@ -19,11 +19,13 @@ #include <linux/of_platform.h> #include <linux/module.h> +#define DEFAULT_TIMEOUT_MS 3000 /* * Hold configuration here, cannot be more than one instance of the driver * since pm_power_off itself is global. */ static struct gpio_desc *reset_gpio; +static u32 timeout; static void gpio_poweroff_do_poweroff(void) {
@@ -40,7 +42,7 @@ static void gpio_poweroff_do_poweroff(void) gpiod_set_value(reset_gpio, 1); /* give it some time */ - mdelay(3000); + mdelay(timeout); WARN_ON(1); }
@@ -49,6 +51,7 @@ static int gpio_poweroff_probe(struct platform_device *pdev) { bool input = false; enum gpiod_flags flags; + int ret; /* If a pm_power_off function has already been added, leave it alone */ if (pm_power_off != NULL) {
@@ -64,6 +67,10 @@ static int gpio_poweroff_probe(struct platform_device *pdev) else flags = GPIOD_OUT_LOW; + ret = of_property_read_u32(pdev->dev.of_node, "timeout", &timeout); + if (ret) + timeout = DEFAULT_TIMEOUT_MS; + reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags); if (IS_ERR(reset_gpio)) return PTR_ERR(reset_gpio);
--
2.16.1