Re: [PATCH] arm: dts: allwinner: t113s mangopi: enable watchdog for reboot

[Andre Przywara]

On Fri, 17 Apr 2026 20:19:20 +0200
Jernej Škrabec <jernej.skrabec@xxxxxxxxx> wrote:

> Hi,
> 
> Dne nedelja, 12. april 2026 ob 19:42:10 Srednjeevropski poletni čas je Michal Piekos napisal(a):
> > Reboot hangs on MangoPi MQ-R T113s because no restart handler is
> > available.
> > 
> > Enable the SoC watchdog whose driver registers a restart handler.
> > 
> > Tested on MangoPi MQ-R T113s.
> > 
> > Signed-off-by: Michal Piekos <michal.piekos@xxxxxxxxxxxxx>
> > ---
> >  arch/arm/boot/dts/allwinner/sun8i-t113s-mangopi-mq-r-t113.dts | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/allwinner/sun8i-t113s-mangopi-mq-r-t113.dts b/arch/arm/boot/dts/allwinner/sun8i-t113s-mangopi-mq-r-t113.dts
> > index 8b3a75383816..f0232a5e903b 100644
> > --- a/arch/arm/boot/dts/allwinner/sun8i-t113s-mangopi-mq-r-t113.dts
> > +++ b/arch/arm/boot/dts/allwinner/sun8i-t113s-mangopi-mq-r-t113.dts
> > @@ -33,3 +33,7 @@ rtl8189ftv: wifi@1 {
> >  		interrupt-names = "host-wake";
> >  	};
> >  };
> > +
> > +&wdt {
> > +	status = "okay";
> > +};  
> 
> Move this to sun8i-t113s.dtsi. All t113 boards have the same issue.
> Watchdog should be always enabled on ARM.

We actually have that line in U-Boot:
https://github.com/u-boot/u-boot/blob/master/arch/arm/dts/sunxi-u-boot.dtsi#L22-L27

IIRC, the idea was that it is *firmware* that chooses the watchdog, so
the generic DT should not be the place to set this.

If people use $fdtcontroladdr as the DT source, everything falls in
place neatly, no need for changes or runtime patching.

Cheers,
Andre