linux-kernel - Re: [PATCH v3 1/2] dt-bindings: display/msm: dsi-controller-main: Fix deprecated compatible

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Date:   Mon, 6 Mar 2023 11:05:49 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.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>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>
Cc:     Rob Herring <robh@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: display/msm: dsi-controller-main: Fix
 deprecated compatible



On 4.03.2023 18:53, Bryan O'Donoghue wrote:
> On 04/03/2023 17:45, Bryan O'Donoghue wrote:
>> On 04/03/2023 17:35, Konrad Dybcio wrote:
>>>> you'll see no error. However if you just do this
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
>>>> index 0733c2f4f3798..829fbe05b5713 100644
>>>> --- a/arch/arm64/boot/dts/qcom/msm8916.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
>>>> @@ -1094,8 +1094,7 @@ mdp5_intf1_out: endpoint {
>>>>                          };
>>>>
>>>>                          dsi0: dsi@...8000 {
>>>> -                               compatible = "qcom,msm8916-dsi-ctrl",
>>>> -                                            "qcom,mdss-dsi-ctrl";
>>>> +                               compatible = "qcom,mdss-dsi-ctrl";
>>>>                                  reg = <0x01a98000 0x25c>;
>>>>                                  reg-names = "dsi_ctrl";
>>>>
>>>>
>>>> and run the same test you get
>>> Yes, correct. It's valid but it's deprecated, so the bindings are
>>> sane. Keep in mind there's an ABI-like aspect to this.
>>>
>>> Konrad
>>
>> The _driver_ will still accept "qcom,mdss-dsi-ctrl" which is ABI compliant but, I don't see why the yaml should.
>>
>> If you declare a new .dts with only "qcom,mdss-dsi-ctrl", that should throw a yaml check error.
>>
>> ---
>> bod
> 
> Actually. I agree with you, I just dislike it.
If I understand correctly, you are dissatisfied with dt_binding_check
not even throwing a warning when a deprecated binding is present.. I
agree, that could be improved..

Konrad
> 
> - "qcom,mdss-dsi-ctrl" <- the driver will accept this
> - "qcom,dsi-ctrl-6g-qcm2290" <- the driver will not accept this
> 
> bah
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>