linux-kernel - Re: [PATCH v2] docs: dt-bindings: add DTS Coding Style document

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Date:   Tue, 21 Nov 2023 09:37:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Michal Simek <michal.simek@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, Andrew Davis <afd@...com>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Heiko Stuebner <heiko@...ech.de>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Nishanth Menon <nm@...com>, Olof Johansson <olof@...om.net>,
        linux-rockchip@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2] docs: dt-bindings: add DTS Coding Style document

On 21/11/2023 09:08, Geert Uytterhoeven wrote:
>>>>> I guess there are (many) other examples...
>>>>
>>>> OK, I never had such in my hands. Anyway, the SoM which can run
>>>> standalone  has a meaning of a board, so how exactly you want to
>>>> rephrase the paragraph?
>>>
>>> What about?
>>>
>>> 2. If applicable: DTSI with common or re-usable parts of the hardware (e.g.
>>> entire System-on-Module). DTS if runs standalone.
>>
>> OK, but then it's duplicating the option 3. It also suggests that SoM
>> should be a DTS, which is not what we want for such case. Such SoMs must
>> have DTSI+DTS.
> 
> So you want us to have a one-line <SoM>.dts, which just includes <SoM>.dtsi?
> IMHO that adds more files for no much gain.

Yes, if this is a real SoM, then yes. There is much gain - it clearly
represents the hardware like we in general expect. It allows re-usage by
in- and out-tree users, while documenting this possibility.

We structure DTS according to main components of the hardware, which
serves as self-documenting, re-usable and easy to grasp solution.

> Users of a SoM can easily include <SoM>.dts.

Which is confusing during review and not a welcomed pattern.

> 'git grep "#include .*dts\>"' tells you we have plenty of users of that scheme.

Yeah, you can put C functions inside header (included only once). You
can include C file in other C file. But just because you can do it, it
does not mean you should do it. It's not the way we want to make code
organized.


Best regards,
Krzysztof