linux-kernel - Re: [v3] arm64: dts: sc7180: add nodes for idp display

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Date:   Wed, 24 Jun 2020 18:07:18 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Harigovindan P <harigovi@...eaurora.org>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org
Cc:     Harigovindan P <harigovi@...eaurora.org>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        kalyan_t@...eaurora.org, nganji@...eaurora.org
Subject: Re: [v3] arm64: dts: sc7180: add nodes for idp display

Quoting Harigovindan P (2020-02-17 00:58:42)
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> index 388f50ad4fde..349db8fe78a5 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> @@ -232,6 +233,57 @@ vreg_bob: bob {
>         };
>  };
>  
> +&dsi0 {
> +       status = "okay";
> +
> +       vdda-supply = <&vreg_l3c_1p2>;
> +
> +       panel@0 {
> +               compatible = "visionox,rm69299-1080p-display";
> +               reg = <0>;
> +
> +               vdda-supply = <&vreg_l8c_1p8>;
> +               vdd3p3-supply = <&vreg_l18a_2p8>;
> +
> +               pinctrl-names = "default";
> +               pinctrl-0 = <&disp_pins>;
> +
> +               reset-gpios = <&pm6150l_gpio 3 GPIO_ACTIVE_HIGH>;
> +
> +               ports {
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       port@0 {
> +                               reg = <0>;
> +                               panel0_in: endpoint {
> +                                       remote-endpoint = <&dsi0_out>;
> +                               };
> +                       };
> +               };
> +       };
> +
> +       ports {
> +               port@1 {
> +                       endpoint {
> +                               remote-endpoint = <&panel0_in>;
> +                               data-lanes = <0 1 2 3>;

Is this property needed? If it's the default assumption it would be nice
to omit it so that we don't have to think about it.

> +                       };
> +               };
> +       };
> +};
> +
> +&dsi_phy {
> +       status = "okay";
> +};
> +
> +&mdp {
> +       status = "okay";
> +};
> +
> +&mdss {
> +       status = "okay";
> +};
> +
>  &qspi {
>         status = "okay";
>         pinctrl-names = "default";
> @@ -289,6 +341,17 @@ &usb_1_qmpphy {
>  
>  /* PINCTRL - additions to nodes defined in sc7180.dtsi */
>  
> +&pm6150l_gpio {
> +       disp_pins: disp-pins {

Curious how this works. It looks like PMIC GPIOS are expecting the node
to look like:

	disp_pins: disp-pins {
		pinconf {
			pins = "gpio3";
			function = PMIC_GPIO_FUNC_FUNC1;
			qcom,drive-strength = <PMIC_GPIO_STRENGTH_MED>;
			power-source = <PM6150_GPIO_VPH>;
			bias-disable;
			output-low;
		};

but this doesn't use the macros or the subnode for pinconf. Why? Also,
the PM6150_GPIO_VPH macro doesn't exist.

> +               pins = "gpio3";
> +               function = "func1";
> +               qcom,drive-strength = <2>;
> +               power-source = <0>;
> +               bias-disable;
> +               output-low;
> +       };
> +};
> +