linux-kernel - Re: [PATCH v7 2/4] arm64: dts: qcom: sc8280xp-crd: Enable EDP

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Date:   Wed, 11 Jan 2023 12:47:12 -0600
From:   Bjorn Andersson <andersson@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 2/4] arm64: dts: qcom: sc8280xp-crd: Enable EDP

On Wed, Jan 11, 2023 at 02:24:54PM +0100, Johan Hovold wrote:
> On Tue, Jan 10, 2023 at 07:59:04PM -0800, Bjorn Andersson wrote:
> > From: Bjorn Andersson <bjorn.andersson@...aro.org>
> > 
> > The SC8280XP CRD has a EDP display on MDSS0 DP3, enable relevant nodes
> > and link it together with the backlight control.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> > ---
> > 
> > Changes since v6:
> > - None
> > 
> >  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts | 73 ++++++++++++++++++++++-
> >  1 file changed, 72 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> > index 551768f97729..db12d8678861 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> > @@ -20,7 +20,7 @@ aliases {
> >  		serial0 = &qup2_uart17;
> >  	};
> >  
> > -	backlight {
> > +	backlight: backlight {
> >  		compatible = "pwm-backlight";
> >  		pwms = <&pmc8280c_lpg 3 1000000>;
> >  		enable-gpios = <&pmc8280_1_gpios 8 GPIO_ACTIVE_HIGH>;
> > @@ -34,6 +34,22 @@ chosen {
> >  		stdout-path = "serial0:115200n8";
> >  	};
> >  
> > +	vreg_edp_3p3: regulator-edp-3p3 {
> > +		compatible = "regulator-fixed";
> > +
> > +		regulator-name = "VREG_EDP_3P3";
> 
> Looks like you forgot to change this to "VCC3LCD" which should be the
> net name.
> 

That's because it's not called VCC3LCD on the CRD.

> > +		regulator-min-microvolt = <3300000>;
> > +		regulator-max-microvolt = <3300000>;
> > +
> > +		gpio = <&tlmm 25 GPIO_ACTIVE_HIGH>;
> > +		enable-active-high;
> > +
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&edp_reg_en>;
> > +
> > +		regulator-boot-on;
> > +	};
> > +
> >  	vreg_edp_bl: regulator-edp-bl {
> >  		compatible = "regulator-fixed";
> 
> > @@ -494,6 +559,12 @@ hastings_reg_en: hastings-reg-en-state {
> >  &tlmm {
> >  	gpio-reserved-ranges = <74 6>, <83 4>, <125 2>, <128 2>, <154 7>;
> >  
> > +	edp_reg_en: edp-reg-en-state {
> > +		pins = "gpio25";
> > +		function = "gpio";
> > +		drive-strength = <16>;
> 
> 'bias-disable' as well?
> 

Sound like a good idea, adding that as I'm picking up the patches.

Regards,
Bjorn

> > +	};
> > +
> >  	kybd_default: kybd-default-state {
> >  		disable-pins {
> >  			pins = "gpio102";
> 
> Looks good otherwise,
> 
> Reviewed-by: Johan Hovold <johan+linaro@...nel.org>
> 
> Johan