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Message-ID: <e1c53cd8-9875-08dc-5662-58f868c40628@kernel.org>
Date:   Tue, 27 Jun 2023 11:07:22 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Lux Aliaga <they@...t.lgbt>
Subject: Re: [PATCH 03/15] dt-bindings: clock: qcom,dispcc-sm6125: Require GCC
 PLL0 DIV clock

On 27/06/2023 11:02, Marijn Suijten wrote:
>>>>> So deleting a new item at the end does not matter.  But what if I respin
>>>>> this patch to add the new clock _at the end_, which will then be at the
>>>>> same index as the previous GCC_DISP_AHB_CLK?
>>>>
>>>> I think you know the answer, right? What do you want to prove? That two
>>>> independent changes can have together negative effect? We know this.
>>>
>>> The question is whether this is allowed?
>>
>> That would be an ABI break and I already explained if it is or is not
>> allowed.
> 
> How should we solve it then, if we cannot remove GCC_DISP_AHB_CLK in one
> patch and add GCC_DISP_GPLL0_DIV_CLK_SRC **at the end** in the next
> patch?  Keep an empty spot at the original index of GCC_DISP_AHB_CLK?

I don't know if you are trolling me or really asking question, so just
in case it is the latter:

"No one is locked into the ABI. SoC maintainer decides on this. "

Also:
https://lore.kernel.org/linux-arm-msm/20230608152759.GA2721945-robh@kernel.org/

https://lore.kernel.org/linux-arm-msm/CAL_JsqKOq+PdjUPVYqdC7QcjGxp-KbAG_O9e+zrfY7k-wRr1QQ@mail.gmail.com/

https://lore.kernel.org/linux-arm-msm/20220602143245.GA2256965-robh@kernel.org/

https://lore.kernel.org/linux-arm-msm/20220601202452.GA365963-robh@kernel.org/

Any many more.

Best regards,
Krzysztof

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