linux-kernel - Re: Missing ARM TWD Watchdog driver?

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Message-ID: <60dceae6-5c7c-9f2d-9fcb-5e849f1d8ce5@roeck-us.net>
Date:   Mon, 17 Jan 2022 08:34:57 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Boris Lysov <arzamas-16@...l.ee>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: Missing ARM TWD Watchdog driver?

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:
> 
> arch/arm/boot/dts/arm-realview-eb-mp.dtsi
> arch/arm/boot/dts/arm-realview-pb11mp.dts
> arch/arm/boot/dts/arm-realview-pbx-a9.dts
> arch/arm/boot/dts/bcm5301x.dtsi
> arch/arm/boot/dts/bcm63138.dtsi
> arch/arm/boot/dts/bcm-hr2.dtsi
> arch/arm/boot/dts/bcm-nsp.dtsi
> arch/arm/boot/dts/berlin2cd.dtsi
> arch/arm/boot/dts/highbank.dts
> arch/arm/boot/dts/mmp3.dtsi
> arch/arm/boot/dts/owl-s500.dtsi
> arch/arm/boot/dts/spear13xx.dtsi
> arch/arm/boot/dts/ste-dbx5x0.dtsi
> arch/arm/boot/dts/vexpress-v2p-ca5s.dts
> arch/arm/boot/dts/vexpress-v2p-ca9.dts
> 
> 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.

Guenter