linux-kernel - Re: [PATCH 5/7] arm64: dts: mediatek: mt6795: Add fixed clocks for 32kHz and 26MHz XOs

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Date:   Mon, 16 May 2022 10:51:44 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        robh+dt@...nel.org
Cc:     krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, paul.bouchara@...ainline.org,
        kernel@...labora.com
Subject: Re: [PATCH 5/7] arm64: dts: mediatek: mt6795: Add fixed clocks for
 32kHz and 26MHz XOs

Il 16/05/22 09:10, Krzysztof Kozlowski ha scritto:
> On 13/05/2022 19:16, AngeloGioacchino Del Regno wrote:
>> Add the 32kHz and 26MHz oscillators as fixed clocks in devicetree to
>> provide a good initial clock spec, since this SoC features two always
> 
> I don't understand that part with actual patch. You claim here you add
> clocks, but in DTS they were already before.
> 
> Additionally, these clocks do not belong to DTSI because, AFAIU, these
> are properties of boards. At least their frequencies should be moved to
> the board DTS.
> 
> 

I should reword the commit description to be clearer, sorry about that: I
went with "exactly what I've done", but looking at the actual diff, it is
just a rename. What my brain was ticking on here was about removing clocks
that didn't really exist (uart_clk is not a fixed clock, etc), and adding
the ones that do exist.... but then again, the result, casually, is a rename.

In any case... no, these clocks are not board-specific for two reasons:
1. AFAIK, these fixed clock outputs are from the SoC itself, not from
    external components placed on the board, and
2. Even if these were from external components, the SoC *needs* these
    ones to work and any board that doesn't have these fixed XOs simply
    wouldn't be able to work.

Cheers,
Angelo