From: Boris Lysov <arzamas-16@mail.ee>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Guenter Roeck <linux@roeck-us.net>,
linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: Missing ARM TWD Watchdog driver?
Date: Tue, 18 Jan 2022 04:25:12 +0300 [thread overview]
Message-ID: <20220118042512.360ee83a@pc> (raw)
In-Reply-To: <20220117170225.GB94025@C02TD0UTHF1T.local>
Hi Mark and Guenter,
On Mon, 17 Jan 2022 17:02:25 +0000,
Mark Rutland <mark.rutland@arm.com> wrote:
> On Mon, Jan 17, 2022 at 08:34:57AM -0800, Guenter Roeck wrote:
> > On 1/17/22 8:01 AM, Boris Lysov wrote:
> > > Hello everyone,
> > >
> > > I stumbled upon the ARM TWD Watchdog driver which seems to be missing (or
> > > I'm just blind).
> > >
> > > As per commit a33f5c380c4bd3fa5278d690421b72052456d9fe ("Merge tag
> > > 'xfs-5.17-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux"),
> > > multiple device trees declare usage of arm-twd:
> > >
> > > (...)
> > >
> > > and it is documented in
> > > Documentation/devicetree/bindings/watchdog/arm,twd-wdt.yaml
> > >
> > > However I could not find the driver itself. I tried running
> > > case-insensitive grep and ripgrep to no avail. Does this driver actually
> > > exist? Is it gone?
> > >
> >
> > I may be missing it, but I do not see any evidence that it ever existed.
>
> Likewise, AFAICT we added the binding but never the driver.
>
> Looking at the git history, that schema was introduced in commit:
>
> 50e02e9a030a9ae3 ("dt-bindings: timer: arm,twd: Convert to json-schema")
>
> ... and replaced Documentation/devicetree/bindings/timer/arm,twd.txt
>
> Per:
>
> $ git log --follow Documentation/devicetree/bindings/timer/arm,twd.txt
>
> That was introduced alongside a driver in commit:
>
> d8e0364364d333fe ("ARM: smp_twd: add device tree support")
>
> ... which only introduced a driver for the timer, and not the watchdog,
> as the commit message notes.
>
> Thanks.
> Mark.
Now I understand there's no ARM TWD Watchdog driver.
TYVM for your replies!
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prev parent reply other threads:[~2022-01-18 1:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-17 16:01 Missing ARM TWD Watchdog driver? Boris Lysov
2022-01-17 16:34 ` Guenter Roeck
2022-01-17 17:02 ` Mark Rutland
2022-01-18 1:25 ` Boris Lysov [this message]
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