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

[Guenter Roeck]

On Tue, Jun 01, 2021 at 11:43:27AM +0200, nicolas saenz julienne wrote:
> On Sun, 2021-05-30 at 11:26 +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>
> > ---
> >  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");
> 
> nit: shoudln't this be a warning?
> 
No. If anything, it should not be there in the first place, but I didn't want
to argue about it. It is perfectly valid for a system to have more than one
means to reset it, meaning this message is just noise. Making it a warning
would just make it worse.

Guenter

> Other than that,
> 
> Reviewed-by: Nicolas Saenz Julienne <nsaenz at kernel.org>
> 
> Regards,
> Nicolas
> 
>