Hi Mark and Guenter,
On Mon, 17 Jan 2022 17:02:25 +0000,
Mark Rutland <mark.rutland@xxxxxxx> 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!
