linux-kernel - Re: [PATCH v5 11/12] arm64: dts: qcom: sc8280xp-crd: Enable EDP

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Date:   Fri, 9 Dec 2022 11:35:23 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        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>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Kalyan Thota <quic_kalyant@...cinc.com>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        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 v5 11/12] arm64: dts: qcom: sc8280xp-crd: Enable EDP

On Wed, Dec 07, 2022 at 02:00:11PM -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 v4:
> - None
> 
>  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts | 72 ++++++++++++++++++++++-
>  1 file changed, 71 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> index f09810e3d956..a7d2384cbbe8 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";

Please use the net name from the schematics here (i.e. "VCC3LCD").

> +		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";
>  
> @@ -230,6 +246,54 @@ vreg_l9d: ldo9 {
>  	};
>  };
>  
> +&dispcc0 {
> +	status = "okay";
> +};
> +
> +&mdss0 {
> +	status = "okay";
> +};
> +
> +&mdss0_dp3 {
> +	compatible = "qcom,sc8280xp-edp";
> +	status = "okay";

Please move the status property last (i.e. after data-lanes).

> +
> +	data-lanes = <0 1 2 3>;
> +
> +	aux-bus {
> +		panel {
> +			compatible = "edp-panel";
> +			power-supply = <&vreg_edp_3p3>;
> +
> +			backlight = <&backlight>;
> +
> +			ports {
> +				port {
> +					edp_panel_in: endpoint {
> +						remote-endpoint = <&mdss0_dp3_out>;
> +					};
> +				};
> +			};
> +		};
> +	};
> +
> +	ports {
> +		port@1 {
> +			reg = <1>;
> +			mdss0_dp3_out: endpoint {
> +				remote-endpoint = <&edp_panel_in>;
> +			};
> +		};
> +	};
> +};
> +
> +&mdss0_dp3_phy {
> +	status = "okay";

Same here.

> +
> +	vdda-phy-supply = <&vreg_l6b>;
> +	vdda-pll-supply = <&vreg_l3b>;
> +};
> +
>  &pcie2a {
>  	perst-gpios = <&tlmm 143 GPIO_ACTIVE_LOW>;
>  	wake-gpios = <&tlmm 145 GPIO_ACTIVE_LOW>;
> @@ -496,6 +560,12 @@ 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";
> +		output-enable;

'output-enable' is not valid for tlmm and causes the settings to be
rejected:

	sc8280xp-tlmm f100000.pinctrl: pin_config_group_set op failed for group 25
	reg-fixed-voltage regulator-edp-3p3: Error applying setting, reverse things back

> +	};
> +
>  	kybd_default: kybd-default-state {
>  		disable-pins {
>  			pins = "gpio102";

Johan