linux-kernel - Re: [PATCH] arm64: dts: qcom: hamoa-iot-evk: Enable display support

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Message-ID: <6wwcxwgcf4wm4ekb3d4ukkyyqsseaawo6l66umzxim4kcilynm@fc6mwj6ymnes>
Date: Wed, 23 Jul 2025 14:21:38 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: hamoa-iot-evk: Enable display support

On Wed, Jul 23, 2025 at 02:14:55PM +0800, Yongxing Mou wrote:
> Enable DisplayPort support on all three USB-C ports of the
> hamoa-iot-evk platform.
> 
> Unlike most X1E-based boards, this platform uses FSUSB42 USB
> switches for the USB0 Type-C port, while USB1 and USB2 rely on
> Parade PS8830 retimers for Alt Mode switching.
> 
> Support for the PS8830 retimers was already included in the
> initial DTS, so this change adds support for the FSUSB42 switches.
> 
> Due to limitations in the USB/DP combo PHY driver, DisplayPort
> functionality is limited to 2 lanes instead of the maximum 4,
> consistent with other X1E-based platforms.
> 
> The platform also supports embedded DisplayPort (eDP) by default.
> 
> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
> ---
> This change made top of initial DTS:
> https://lore.kernel.org/all/20250716-hamoa_initial-v1-0-f6f5d0f9a163@oss.qualcomm.com/
> ---
>  arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 156 +++++++++++++++++++++++++++++
>  1 file changed, 156 insertions(+)
> +
> +	ports {
> +		port@1 {
> +			reg = <1>;
> +			mdss_dp3_out: endpoint {

Add empty endpoint to x1e80100.dtsi, then patch it here like you do for
all other DP endpoints.

> +				data-lanes = <0 1 2 3>;
> +				link-frequencies = /bits/ 64 <1620000000 2700000000
> +							      5400000000 8100000000>;
> +
> +				remote-endpoint = <&edp_panel_in>;
> +			};
> +		};
> +	};
> +};
> +

-- 
With best wishes
Dmitry