linux-kernel - Re: [PATCH v1 2/4] arm64: dts: qcom: sc7280: add display dt nodes

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Message-ID: <8f344213978f31c04e80b804a931db56@codeaurora.org>
Date:   Fri, 01 Oct 2021 12:09:07 +0530
From:   mkrishn@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kalyan_t@...eaurora.org,
        sbillaka@...eaurora.org, abhinavk@...eaurora.org,
        robdclark@...il.com, bjorn.andersson@...aro.org,
        khsieh@...eaurora.org, rajeevny@...eaurora.org,
        freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        robh+dt@...nel.org
Subject: Re: [PATCH v1 2/4] arm64: dts: qcom: sc7280: add display dt nodes

On 2021-09-30 23:28, Stephen Boyd wrote:
> Quoting mkrishn@...eaurora.org (2021-09-30 04:56:59)
>> On 2021-08-19 01:27, Stephen Boyd wrote:
>> > Quoting Krishna Manikandan (2021-08-18 03:27:02)
>> >> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >> b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >> index 53a21d0..fd7ff1c 100644
>> >> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >> +
>> >> +                       status = "disabled";
>> >> +
>> >> +                       mdp: mdp@...1000 {
>> >
>> > display-controller@...1000
>> 
>> Stephen,
>>     In the current driver code, there is a substring comparison for 
>> "mdp"
>> in device node name as part of probe sequence. If "mdp" is not present
>> in the node name, it will
>>     return an error resulting in probe failure. Can we continue using 
>> mdp
>> as nodename instead of display controller?
>> 
> 
> Can we fix the driver to not look for node names and look for 
> compatible
> strings instead? It took me a minute to find compare_name_mdp() in
> drivers/gpu/drm/msm/msm_drv.c to understand what you're talking about.
> Perhaps looking for qcom,mdp5 in there will be sufficient instead of
> looking at the node name.

Sure Stephen. I will make the necessary changes in msm_drv.c to look for 
compatible string instead of node name.
Can I include these two changes (changing mdp--> display controller and 
msm_drv.c changes) in a separate series ?

Thanks,
Krishna