linux-kernel - Re: [PATCH v3 2/2] power: reset: gpio-poweroff: Support for timeout from device property

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Message-ID: <20180309161926.hciaq3ok7st3fc7j@earth.universe>
Date:   Fri, 9 Mar 2018 17:19:26 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, robh+dt@...nel.org,
        andy.shevchenko@...il.com
Subject: Re: [PATCH v3 2/2] power: reset: gpio-poweroff: Support for timeout
 from device property

Hi,

On Thu, Feb 22, 2018 at 03:17:14PM -0800, Moritz Fischer wrote:
> Add support for reading a timeout value from device property.
> Fall back to previous default of 3s if nothing is specified.
> 
> Signed-off-by: Moritz Fischer <mdf@...nel.org>
> ---

Thanks, both queued.

-- Sebastian

> Changes from v2:
> - use device_property_read_{bool,u32} instead of of equivalent
> 
> Changes from v1:
> - of_property_read_u32() overwrites the output only if it succeeds,
>   simplify error handling
> ---
> 
>  drivers/power/reset/gpio-poweroff.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
> index be3d81ff51cc..6273ad3b411d 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);
>  }
> @@ -58,12 +60,14 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
>  		return -EBUSY;
>  	}
>  
> -	input = of_property_read_bool(pdev->dev.of_node, "input");
> +	input = device_property_read_bool(&pdev->dev, "input");
>  	if (input)
>  		flags = GPIOD_IN;
>  	else
>  		flags = GPIOD_OUT_LOW;
>  
> +	device_property_read_u32(&pdev->dev, "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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