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

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Date:   Mon, 4 Oct 2021 21:51:46 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     mkrishn@...eaurora.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

Quoting mkrishn@...eaurora.org (2021-09-30 23:39:07)
> 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 ?
>

Sure. So you'll send the drm driver change now and we'll get the DT
change after that with the more generic node name?