[PATCH 2/6] watchdog: bcm2835_wdt: consider system-power-controller property

[Guenter Roeck]

On Sun, May 30, 2021 at 11:26:11AM +0200, Stefan Wahren wrote:
> Until now all Raspberry Pi boards used the power off function of the SoC.
> But the Raspberry Pi 400 uses gpio-poweroff for the whole board which
> possibly cannot register the poweroff handler because the it's
> already registered by this watchdog driver. So consider the
> system-power-controller property for registering, which is already
> defined in soc/bcm/brcm,bcm2835-pm.txt .
> 
> Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>

Reviewed-by: Guenter Roeck <linux at roeck-us.net>

> ---
>  drivers/watchdog/bcm2835_wdt.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c
> index dec6ca0..9490717 100644
> --- a/drivers/watchdog/bcm2835_wdt.c
> +++ b/drivers/watchdog/bcm2835_wdt.c
> @@ -205,9 +205,13 @@ static int bcm2835_wdt_probe(struct platform_device *pdev)
>  	if (err)
>  		return err;
>  
> -	if (pm_power_off == NULL) {
> -		pm_power_off = bcm2835_power_off;
> -		bcm2835_power_off_wdt = wdt;
> +	if (of_device_is_system_power_controller(pdev->dev.parent->of_node)) {
> +		if (!pm_power_off) {
> +			pm_power_off = bcm2835_power_off;
> +			bcm2835_power_off_wdt = wdt;
> +		} else {
> +			dev_info(dev, "Poweroff handler already present!\n");
> +		}
>  	}
>  
>  	dev_info(dev, "Broadcom BCM2835 watchdog timer");
> -- 
> 2.7.4
>