linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8250: add a link between DWC3 and QMP PHY

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Date: Fri, 22 Mar 2024 12:11:38 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8250: add a link between DWC3 and
 QMP PHY

On 22/03/2024 11:58, Dmitry Baryshkov wrote:
> The SuperSpeed signals originate from the DWC3 host controller and then
> are routed through the Combo QMP PHY, where they are multiplexed with
> the DisplayPort signals. Add corresponding OF graph link.
> 
> Reported-by: Luca Weiss <luca.weiss@...rphone.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   arch/arm64/boot/dts/qcom/sm8250.dtsi | 24 ++++++++++++++++++++++--
>   1 file changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> index d57039a4c3aa..e551e733ab94 100644
> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> @@ -3917,6 +3917,10 @@ port@0 {
>   
>   				port@1 {
>   					reg = <1>;
> +
> +					usb_1_qmpphy_usb_ss_in: endpoint {
> +						remote-endpoint = <&usb_1_dwc3_ss_out>;
> +					};
>   				};
>   
>   				port@2 {
> @@ -4195,8 +4199,24 @@ usb_1_dwc3: usb@...0000 {
>   				phys = <&usb_1_hsphy>, <&usb_1_qmpphy QMP_USB43DP_USB3_PHY>;
>   				phy-names = "usb2-phy", "usb3-phy";
>   
> -				port {
> -					usb_1_dwc3_hs_out: endpoint {};
> +				ports {
> +					#address-cells = <1>;
> +					#size-cells = <0>;
> +
> +					port@0 {
> +						reg = <0>;
> +
> +						usb_1_dwc3_hs_out: endpoint {
> +						};
> +					};
> +
> +					port@1 {
> +						reg = <1>;
> +
> +						usb_1_dwc3_ss_out: endpoint {
> +							remote-endpoint = <&usb_1_qmpphy_usb_ss_in>;
> +						};
> +					};
>   				};
>   			};
>   		};
> 

I think these should go into platform definitions, there's nothing at 
the SoC level that imposes the port constraint.

---
bod