linux-kernel - Re: [PATCH 03/15] dt-bindings: clock: qcom,dispcc-sm6125: Require GCC PLL0 DIV clock

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Date:   Mon, 26 Jun 2023 20:29:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.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 26/06/2023 19:49, Marijn Suijten wrote:
> On 2023-06-26 18:10:44, Krzysztof Kozlowski wrote:
>> On 25/06/2023 21:48, Marijn Suijten wrote:
>>> On 2023-06-24 11:08:54, Krzysztof Kozlowski wrote:
>>>> On 24/06/2023 03:45, Konrad Dybcio wrote:
>>>>> On 24.06.2023 02:41, Marijn Suijten wrote:
>>>>>> The "gcc_disp_gpll0_div_clk_src" clock is consumed by the driver, will
>>>>>> be passed from DT, and should be required by the bindings.
>>>>>>
>>>>>> Fixes: 8397c9c0c26b ("dt-bindings: clock: add QCOM SM6125 display clock bindings")
>>>>>> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
>>>>>> ---
>>>>> Ideally, you'd stick it at the bottom of the list, as the items: order
>>>>> is part of the ABI
>>>>
>>>> Yes, please add them to the end. Order is fixed.
>>>
>>> Disagreed for bindings that declare clock-names and when the driver
>>> adheres to it, see my reply to Konrad's message.
>>
>> That's the generic rule, with some exceptions of course. Whether one
>> chosen driver (chosen system and chosen version of that system) adheres
>> or not, does not change it. Other driver behaves differently and ABI is
>> for everyone, not only for your specific version of Linux driver.
>>
>> Follow the rule.
> 
> This has no relation to the driver (just that our driver adheres to the
> bindings, as it is supposed to be).  The bindings define a mapping from
> a clock-names=<> entry to a clock on the same index in the clocks=<>
> array.  That relation remains the same with this change.

Not really, binding also defines the list of clocks - their order and
specific entries. This changes.

Best regards,
Krzysztof