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

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Message-Id: <95dea968-f452-4ba0-9b66-c9bc4269a52c@www.fastmail.com>
Date:   Sun, 14 Nov 2021 12:37:42 +0100
From:   "Sven Peter" <sven@...npeter.dev>
To:     "Alyssa Rosenzweig" <alyssa@...enzweig.io>
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



On Sat, Nov 13, 2021, at 16:24, Alyssa Rosenzweig wrote:
>> + * 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.

Sven