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 <m...@kernel.org>
---

Changes from v1:
- of_property_read_u32() overwrites the output only if it succeeds,
  simplify error handling
---
 drivers/power/reset/gpio-poweroff.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/power/reset/gpio-poweroff.c 
b/drivers/power/reset/gpio-poweroff.c
index be3d81ff51cc..265cc37646a9 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 = DEFAULT_TIMEOUT_MS;
 
 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);
 }
@@ -64,6 +66,8 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
        else
                flags = GPIOD_OUT_LOW;
 
+       of_property_read_u32(pdev->dev.of_node, "timeout_ms", &timeout);
+
        reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);
        if (IS_ERR(reset_gpio))
                return PTR_ERR(reset_gpio);
-- 
2.16.1

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