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Date:   Tue, 27 Jun 2023 09:29:53 +0200
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Subject: Re: [PATCH 03/15] dt-bindings: clock: qcom,dispcc-sm6125: Require GCC
 PLL0 DIV clock
To:     Marijn Suijten <marijn.suijten@somainline.org>
Cc:     Konrad Dybcio <konrad.dybcio@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Krishna Manikandan <quic_mkrishn@quicinc.com>,
        ~postmarketos/upstreaming@lists.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Martin Botka <martin.botka@somainline.org>,
        Jami Kettunen <jami.kettunen@somainline.org>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Krzysztof Kozlowski <krzk@kernel.org>,
        linux-clk@vger.kernel.org, dri-devel@lists.freedesktop.org,
        freedreno@lists.freedesktop.org, Lux Aliaga <they@mint.lgbt>
References: <20230624-sm6125-dpu-v1-3-1d5a638cebf2@somainline.org>
 <c9681bce-efa8-9b79-4bf6-837dd6a2dc12@linaro.org>
 <55b0ca89-8f2e-5383-59d4-6809e813abf8@linaro.org>
 <vnp263d43flny2ibt3n7fbloyi26enqrejnobogplfu5fcj6l3@s7zkxrsi2rde>
 <52c57cab-10cf-2e7e-2c1d-fa6506786d45@linaro.org>
 <jmtjuya4c423rmdlo4ubvvqndbxvgapal5otjqnejdpdd25izp@kewbjmqdu2xs>
 <6311f26f-79ee-c471-649f-5e0b4629cfcc@linaro.org>
 <uuy5prkjhhs66te7h6z3pu4lzj2cfbiqk6ftjijwoeqpw573av@ogs6cboanvzc>
 <ziykmixskqkgheigefvyo4q3katbc4uix6jtcg7mncs25z4tj5@5gykrfgns4bm>
 <16731023-7dc7-d43d-1b16-fda44c0948ed@linaro.org>
 <yofju7jp7vmv33x7dzvzoelpumfsz3fjqy2ozakfphsuysunon@pglt2wzlsjex>
Content-Language: en-US
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <yofju7jp7vmv33x7dzvzoelpumfsz3fjqy2ozakfphsuysunon@pglt2wzlsjex>
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On 27/06/2023 08:54, Marijn Suijten wrote:
> On 2023-06-27 08:24:41, Krzysztof Kozlowski wrote:
>> On 26/06/2023 20:53, Marijn Suijten wrote:
>>> On 2023-06-26 20:51:38, Marijn Suijten wrote:
>>> <snip>
>>>>> Not really, binding also defines the list of clocks - their order and
>>>>> specific entries. This changes.
>>>>
>>>> And so it does in "dt-bindings: clock: qcom,dispcc-sm6125: Remove unused
>>>> GCC_DISP_AHB_CLK"?
>>>
>>> Never mind: it is the last item so the order of the other items doesn't
>>> change.  The total number of items decreases though, which sounds like
>>> an ABI-break too?
>>
>> How does it break? Old DTS works exactly the same, doesn't it?
> 
> 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.

Best regards,
Krzysztof