linux-kernel - Re: [PATCH 2/2] watchdog: Add Apple SoC watchdog driver

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Message-ID: <YZEMmH49D+GZEewi@sunset>
Date:   Sun, 14 Nov 2021 08:18:16 -0500
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Hector Martin <marcan@...can.st>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] watchdog: Add Apple SoC watchdog driver

> >> + * This HW block has three separate watchdogs. WD0 resets the machine
> >> + * to recovery mode and is not very useful for us. WD1 and WD2 trigger a normal
> >> + * machine reset. WD0 additionally supports a configurable interrupt.
> >
> > Do we have any idea what the difference between WD1 and WD2 is?
> 
> I've never seen macOS write to WD2 when running in our hypervisor and only
> found that one when I was looking at the rest of the MMIO region.
> >From what I can tell it works exactly like WD1.

Makes sense, thanks.