Re: [PATCH 2/2] arm64: dts: h6: Add watchdog node

[ClÃment PÃron]

Hi,

On Fri, 5 Apr 2019 at 17:08, Maxime Ripard <maxime.ripard@xxxxxxxxxxx> wrote:
>
> On Fri, Apr 05, 2019 at 10:59:35PM +0800, Chen-Yu Tsai wrote:
> > On Fri, Apr 5, 2019 at 10:50 PM Maxime Ripard <maxime.ripard@xxxxxxxxxxx> wrote:
> > >
> > > On Fri, Apr 05, 2019 at 10:35:08PM +0800, Chen-Yu Tsai wrote:
> > > > On Fri, Apr 5, 2019 at 5:02 PM Maxime Ripard <maxime.ripard@xxxxxxxxxxx> wrote:
> > > > >
> > > > > On Thu, Apr 04, 2019 at 03:57:36PM +0200, ClÃment PÃron wrote:
> > > > > > Allwinner H6 has a watchog compatible with A31.
> > > > > >
> > > > > > Declare it in the device tree.
> > > > > >
> > > > > > Signed-off-by: ClÃment PÃron <peron.clem@xxxxxxxxx>
> > > > >
> > > > > Applied both, thanks!
> > > > > Maxime
> > > >
> > > > IIRC there are 3 watchdogs on the H6. One is the trusted watchdog,
> > > > which should be reserved for underlying firmware.
> > > >
> > > > The other two are the normal and R-block watchdog. Although they
> > > > look the same, the "normal" one can't reset the system. :(
> > > > That one is actually the one ATF currently uses. So reboot doesn't
> > > > work on the H6.

Some users report that the reboot on the PineH64 actually works.

Clement

> > >
> > > So that patch will not do anything then?
> >
> > I'm still on vacation, so I haven't checked the address of the new device.
> > If it's the normal one, then yeah, it won't do anything. I've tried that.
> > IIRC Samuel (or someone else) on IRC also mentioned this.
>
> It's the one in the timer that we've used since pretty much day 1 on
> older SoCs, so I guess it qualifies as the normal one :)
>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com