linux-kernel - Re: [PATCH v3] arm64: dts: qcom: sc7180: Add DisplayPort node

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Date:   Thu, 3 Jun 2021 20:29:15 +0000
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <khsieh@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org,
        robdclark@...il.com, robh+dt@...nel.org, sean@...rly.run,
        vkoul@...nel.org
Cc:     abhinavk@...eaurora.org, aravindh@...eaurora.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arm64: dts: qcom: sc7180: Add DisplayPort node

Quoting Kuogee Hsieh (2021-06-03 09:37:30)
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> index 24d293e..40367a2 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> @@ -786,6 +786,15 @@ hp_i2c: &i2c9 {
>         status = "okay";
>  };
>
> +&dp {

This is in the wrong place now. Bjorn's suggestion for mdss_dp sounds
good to me, and then putting the node in alphabetical order.

> +        status = "okay";
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&dp_hot_plug_det>;
> +        data-lanes = <0 1>;
> +        vdda-1p2-supply = <&vdda_usb_ss_dp_1p2>;
> +        vdda-0p9-supply = <&vdda_usb_ss_dp_core>;
> +};
> +
>  &pm6150_adc {
>         charger-thermistor@4f {
>                 reg = <ADC5_AMUX_THM3_100K_PU>;
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 6228ba2..05a4133 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -3148,6 +3155,77 @@
>
>                                 status = "disabled";
>                         };
> +
> +                       dp: displayport-controller@...0000 {
> +                               compatible = "qcom,sc7180-dp";
> +                               status = "disabled";
> +
> +                               reg = <0 0x0ae90000 0 0x1400>;
> +
> +                               interrupt-parent = <&mdss>;
> +                               interrupts = <12>;
> +
> +                               clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +                                        <&dispcc DISP_CC_MDSS_DP_AUX_CLK>,
> +                                        <&dispcc DISP_CC_MDSS_DP_LINK_CLK>,
> +                                        <&dispcc DISP_CC_MDSS_DP_LINK_INTF_CLK>,
> +                                        <&dispcc DISP_CC_MDSS_DP_PIXEL_CLK>;
> +                               clock-names = "core_iface", "core_aux", "ctrl_link",
> +                                             "ctrl_link_iface", "stream_pixel";
> +                               #clock-cells = <1>;
> +                               assigned-clocks = <&dispcc DISP_CC_MDSS_DP_LINK_CLK_SRC>,
> +                                                 <&dispcc DISP_CC_MDSS_DP_PIXEL_CLK_SRC>;
> +                               assigned-clock-parents = <&dp_phy 0>, <&dp_phy 1>;
> +                               phys = <&dp_phy>;
> +                               phy-names = "dp";
> +
> +                               operating-points-v2 = <&opp_table>;
> +                               power-domains = <&rpmhpd SC7180_CX>;

I'm also curious about the power domain for DP. My guess is that both
DSI and DP nodes should be a child of mdss if they're in the display
subsystem and powered down/inaccessible when the mdss_gdsc is disabled.

> +
> +                               #sound-dai-cells = <0>;
> +
> +                               ports {
> +                                       #address-cells = <1>;
> +                                       #size-cells = <0>;
> +                                       port@0 {
> +                                               reg = <0>;
> +                                               dp_in: endpoint {
> +                                                       remote-endpoint = <&dpu_intf0_out>;
> +                                               };
> +                                       };
> +
> +                                       port@1 {
> +                                               reg = <1>;
> +                                               dp_out: endpoint { };
> +                                       };
> +                               };
> +
> +                               opp_table: dp-opp-table {

I meant

	dp_opp_table: opp-table {
		...
	};

> +                                       compatible = "operating-points-v2";
> +
> +                                       opp-160000000 {
> +                                               opp-hz = /bits/ 64 <160000000>;
> +                                               required-opps = <&rpmhpd_opp_low_svs>;
> +                                       };
> +
> +                                       opp-270000000 {
> +                                               opp-hz = /bits/ 64 <270000000>;
> +                                               required-opps = <&rpmhpd_opp_svs>;