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Message-ID: <3nnk4xvmpnum2q6g6c6crjlqq3ra7j2z5zis53xcqbvevymuhz@mkffvs45n6ut>
Date:   Tue, 27 Jun 2023 09:49:52 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     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,
        Krzysztof Kozlowski <krzk@...nel.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 2023-06-27 09:29:53, Krzysztof Kozlowski wrote:
> 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.

The question is whether this is allowed?

- Marijn

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