linux-kernel - Re: [PATCH 2/3] dt-bindings: timer: Document arm,cortex-a7-timer for arch timer

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Date:   Wed, 16 Mar 2022 17:28:49 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Kuldeep Singh <singh.kuldeep87k@...il.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: timer: Document arm,cortex-a7-timer for
 arch timer

On 16/03/2022 10:54, Kuldeep Singh wrote:
> Renesas RZ/N1D platform uses compatible "arm,cortex-a7-timer" in
> conjugation with "arm,armv7-timer". Since, initial entry is not
> documented, it start raising dtbs_check warnings.
> 
> ['arm,cortex-a7-timer', 'arm,armv7-timer'] is too long
> 'arm,cortex-a7-timer' is not one of ['arm,armv7-timer', 'arm,armv8-timer']
> 'arm,cortex-a7-timer' is not one of ['arm,cortex-a15-timer']
> 
> In general, removing an existing entry is mostly devastating considering
> backward compatibility. Therefore, document it.

How removing undocumented and unused compatible is devastating for
backwards compatibility? I don't see it.

DTS is rather wrong, not bindings. Otherwise please explain it more, why
DTS is correct.



Best regards,
Krzysztof