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

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Date:   Mon, 8 Apr 2019 23:23:26 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jagan Teki <jagan@...rulasolutions.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Samuel Holland <samuel@...lland.org>
Subject: Re: [PATCH 2/2] arm64: dts: h6: Add watchdog node

On Mon, 8 Apr 2019 at 10:16, Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Sun, Apr 07, 2019 at 04:27:36PM +0200, Clément Péron wrote:
> > Hi,
> >
> > On Fri, 5 Apr 2019 at 18:24, Clément Péron <peron.clem@...il.com> wrote:
> > >
> > > Hi,
> > >
> > > On Fri, 5 Apr 2019 at 17:08, Maxime Ripard <maxime.ripard@...tlin.com> 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@...tlin.com> 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@...tlin.com> wrote:
> > > > > > > >
> > > > > > > > On Thu, Apr 04, 2019 at 03:57:36PM +0200, Clément Péron wrote:
> > > > > > > > > Allwinner H6 has a watchog compatible with A31.
> > > > > > > > >
> > > > > > > > > Declare it in the device tree.
> > > > > > > > >
> > > > > > > > > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > > > > > > >
> > > > > > > > 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?
> >
> > Did some test and only interrupts are working right now. If the WDOG
> > is configured to make the board reboot the system will be stuck :S
> > Maybe better to disabled it for now and leave a comment.
>
> I dropped the two patches
What do you think about having it but disabled with a comment ?

I have tested the r_watchdog and this one is functionnal.

Clement

>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com