Date:   Sun, 14 Nov 2021 08:18:16 -0500
From:   Alyssa Rosenzweig <alyssa@rosenzweig.io>
To:     Sven Peter <sven@svenpeter.dev>
Cc:     Wim Van Sebroeck <wim@linux-watchdog.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Hector Martin <marcan@marcan.st>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Kettenis <mark.kettenis@xs4all.nl>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-watchdog@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] watchdog: Add Apple SoC watchdog driver
Message-ID: <YZEMmH49D+GZEewi@sunset>
References: <20211113094732.73889-1-sven@svenpeter.dev>
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> >> + * 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.