linux-kernel - Re: [PATCH] power: reset: gpio-poweroff: add ability to specific active and inactive delays

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Date:   Wed, 5 Dec 2018 22:45:56 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     robh+dt@...nel.org, mark.rutland@....com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mdf@...nel.org, Heiko Stuebner <heiko.stuebner@...com>
Subject: Re: [PATCH] power: reset: gpio-poweroff: add ability to specific
 active and inactive delays

Hi,

On Sun, Nov 11, 2018 at 10:45:38PM +0100, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner@...com>
> 
> 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: Heiko Stuebner <heiko.stuebner@...com>
> ---

Thanks, queued.

-- Sebastian

>  .../devicetree/bindings/power/reset/gpio-poweroff.txt  |  2 ++
>  drivers/power/reset/gpio-poweroff.c                    | 10 ++++++++--
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt b/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
> index 6d8980c18c34..3e56c1b34a4c 100644
> --- a/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
> +++ b/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
> @@ -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.
>  
> diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
> index 38206c39b3bf..52525b6c18db 100644
> --- a/drivers/power/reset/gpio-poweroff.c
> +++ b/drivers/power/reset/gpio-poweroff.c
> @@ -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);
> -- 
> 2.18.0
> 

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