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

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Message-ID: <f62d750e-da73-fece-c3de-0dac1fbb9827@linaro.org>
Date:   Mon, 26 Jun 2023 11:43:39 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     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 25.06.2023 21:48, Marijn Suijten wrote:
> On 2023-06-24 03:45:02, 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
> 
> This isn't an ABI break, as this driver nor its bindings require/declare
> a fixed order: they declare a relation between clocks and clock-names.
Bindings describe the ABI, drivers implement compliant code flow.

> 
> This orders the GCC clock just like other dispccs.  And the previous
> patch dropped the unused cfg_ahb_clk from the bindings, so all bets are
> off anyway.
Thinking about it again, the binding has not been consumed by any upstream
DT to date, so it should (tm) be fine to let it slide..

Konrad
> 
> - Marijn
> 
>>
>> Konrad
>>>  Documentation/devicetree/bindings/clock/qcom,dispcc-sm6125.yaml | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/clock/qcom,dispcc-sm6125.yaml b/Documentation/devicetree/bindings/clock/qcom,dispcc-sm6125.yaml
>>> index 2acf487d8a2f..11ec154503a3 100644
>>> --- a/Documentation/devicetree/bindings/clock/qcom,dispcc-sm6125.yaml
>>> +++ b/Documentation/devicetree/bindings/clock/qcom,dispcc-sm6125.yaml
>>> @@ -23,6 +23,7 @@ properties:
>>>    clocks:
>>>      items:
>>>        - description: Board XO source
>>> +      - description: GPLL0 div source from GCC
>>>        - description: Byte clock from DSI PHY0
>>>        - description: Pixel clock from DSI PHY0
>>>        - description: Pixel clock from DSI PHY1
>>> @@ -32,6 +33,7 @@ properties:
>>>    clock-names:
>>>      items:
>>>        - const: bi_tcxo
>>> +      - const: gcc_disp_gpll0_div_clk_src
>>>        - const: dsi0_phy_pll_out_byteclk
>>>        - const: dsi0_phy_pll_out_dsiclk
>>>        - const: dsi1_phy_pll_out_dsiclk
>>> @@ -65,12 +67,14 @@ examples:
>>>        compatible = "qcom,sm6125-dispcc";
>>>        reg = <0x5f00000 0x20000>;
>>>        clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>> +               <&gcc GCC_DISP_GPLL0_DIV_CLK_SRC>,
>>>                 <&dsi0_phy 0>,
>>>                 <&dsi0_phy 1>,
>>>                 <&dsi1_phy 1>,
>>>                 <&dp_phy 0>,
>>>                 <&dp_phy 1>;
>>>        clock-names = "bi_tcxo",
>>> +                    "gcc_disp_gpll0_div_clk_src",
>>>                      "dsi0_phy_pll_out_byteclk",
>>>                      "dsi0_phy_pll_out_dsiclk",
>>>                      "dsi1_phy_pll_out_dsiclk",
>>>