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Commit 76ee875c authored by Heiko Stuebner's avatar Heiko Stuebner Committed by Sebastian Reichel
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power: reset: gpio-poweroff: add ability to specific active and inactive delays 



Similar to gpio-reset allow to specify active and inactive delays
while keeping the 100ms defaults that were used previously all the time.

The dt-properties are named the same as in gpio-reset but get an "-ms"
suffix as properties should contain such a suffix specifying its unit.

Signed-off-by: default avatarHeiko Stuebner <heiko.stuebner@bq.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarMoritz Fischer <mdf@kernel.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent a53a68ce

Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ Optional properties: 
  it to an output when the power-off handler is called. If this optional

  property is not specified, the GPIO is initialized as an output in its

  inactive state.

- active-delay-ms: Delay (default 100) to wait after driving gpio active

- inactive-delay-ms: Delay (default 100) to wait after driving gpio inactive

- timeout-ms: Time to wait before asserting a WARN_ON(1). If nothing is

              specified, 3000 ms is used.

drivers/power/reset/gpio-poweroff.c

+8 −2
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
 */

static struct gpio_desc *reset_gpio;

static u32 timeout = DEFAULT_TIMEOUT_MS;

static u32 active_delay = 100;

static u32 inactive_delay = 100;



static void gpio_poweroff_do_poweroff(void)

{
@@ -33,10 +35,11 @@ static void gpio_poweroff_do_poweroff(void) 


	/* drive it active, also inactive->active edge */

	gpiod_direction_output(reset_gpio, 1);

	mdelay(100);

	mdelay(active_delay);



	/* drive inactive, also active->inactive edge */

	gpiod_set_value_cansleep(reset_gpio, 0);

	mdelay(100);

	mdelay(inactive_delay);



	/* drive it active, also inactive->active edge */

	gpiod_set_value_cansleep(reset_gpio, 1);
@@ -66,6 +69,9 @@ static int gpio_poweroff_probe(struct platform_device *pdev) 
	else

		flags = GPIOD_OUT_LOW;



	device_property_read_u32(&pdev->dev, "active-delay-ms", &active_delay);

	device_property_read_u32(&pdev->dev, "inactive-delay-ms",

				 &inactive_delay);

	device_property_read_u32(&pdev->dev, "timeout-ms", &timeout);



	reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);