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

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Message-ID: <20190405150810.zjwtu6crzaz6ufhx@flea>
Date:   Fri, 5 Apr 2019 17:08:10 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Clément Péron <peron.clem@...il.com>,
        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 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.
> >
> > 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

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