linux-kernel - Re: [PATCH v3 1/2] dt-bindings: exynos-dw-mshc-common: add exynos78xx variants

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Message-ID: <f34ba6e5-4a8d-0812-c334-ea47de7b1d21@linaro.org>
Date:   Sun, 12 Mar 2023 18:09:10 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sergey Lisov <sleirsgoevy@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: exynos-dw-mshc-common: add exynos78xx
 variants

On 12/03/2023 17:43, Sergey Lisov wrote:
>> Bindings and DTS (and driver) are always separate.
> 
> Okay, will split the patch.
> 
>> Compatibles must be specific.
> 
> No, this way you'd have tons of identical compatibles that only differ in
> the exynosXXXX digits, and are functionally equivalent.

Thanks for letting me know.

https://elixir.bootlin.com/linux/v6.1-rc1/source/Documentation/devicetree/bindings/writing-bindings.rst#L42

>> That's non-bisectable change (also breaking other users of DTS), so you
>> need to explain in commit msg rationale - devices were never compatible
>> and using exynos7 does not work in certain cases.

BTW, this rationale was only example - you need to come with something real.

Best regards,
Krzysztof