linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: x1e80100-yoga: Update panel bindings

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Message-ID: <CAF6AEGt3hggc+eiWfr4V7YzoVtMNT01EUfn0X_+WvsjuBBDEwA@mail.gmail.com>
Date: Mon, 22 Jul 2024 07:37:05 -0700
From: Rob Clark <robdclark@...il.com>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, Doug Anderson <dianders@...omium.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Abel Vesa <abel.vesa@...aro.org>, 
	Rob Clark <robdclark@...omium.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: x1e80100-yoga: Update panel bindings

On Mon, Jul 22, 2024 at 12:15 AM Stephan Gerhold
<stephan.gerhold@...aro.org> wrote:
>
> On Fri, Jul 19, 2024 at 11:52:50AM -0700, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > Use the correct panel compatible, and wire up enable-gpio.  It is wired
> > up in the same way as the x1e80100-crd.
> >
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > ---
> >  .../boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts   | 13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> > index f569f0fbd1fc..28a6ea5a24fd 100644
> > --- a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> > +++ b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> > @@ -592,9 +592,13 @@ &mdss_dp3 {
> >
> >       aux-bus {
> >               panel {
> > -                     compatible = "edp-panel";
> > +                     compatible = "samsung,atna45dc02", "samsung,atna33xc20";
> > +                     enable-gpios = <&pmc8380_3_gpios 4 GPIO_ACTIVE_HIGH>;
> >                       power-supply = <&vreg_edp_3p3>;
> >
> > +                     pinctrl-0 = <&edp_bl_en>;
> > +                     pinctrl-names = "default";
> > +
> >                       port {
> >                               edp_panel_in: endpoint {
> >                                       remote-endpoint = <&mdss_dp3_out>;
> > @@ -663,6 +667,13 @@ &pcie6a_phy {
> >       status = "okay";
> >  };
> >
> > +&pmc8380_3_gpios {
> > +     edp_bl_en: edp-bl-en-state {
> > +             pins = "gpio4";
> > +             function = "normal";
> > +     };
>
> Did you omit the "power-source" here on purpose? It works without
> because the firmware already configures this pin, but ideally we should
> provide the full configuration.

I just copied the CRD.. other than the panel, things appear to be
wired up in the same way.

BR,
-R

> In /sys/kernel/debug/gpio you can check how the firmware has configured
> the pin. It is probably exactly the same as for the CRD.
>
> Thanks,
> Stephan