linux-kernel - Re: [PATCH V2 6/8] arm64: dts: qcom: sc7280: Add EUD dt node and dwc3 connector

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Message-ID: <YbemBSexMQRCVGYl@robh.at.kernel.org>
Date:   Mon, 13 Dec 2021 13:59:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, pure.logic@...us-software.ie,
        bjorn.andersson@...aro.org, greg@...ah.com,
        linux-kernel@...r.kernel.org, quic_tsoni@...cinc.com,
        quic_psodagud@...cinc.com, quic_satyap@...cinc.com,
        quic_pheragu@...cinc.com, quic_rjendra@...cinc.com,
        quic_sibis@...cinc.com, quic_saipraka@...cinc.com
Subject: Re: [PATCH V2 6/8] arm64: dts: qcom: sc7280: Add EUD dt node and
 dwc3 connector

On Thu, Dec 02, 2021 at 03:21:25PM +0530, Souradeep Chowdhury wrote:
> Add the Embedded USB Debugger(EUD) device tree node. The
> node contains EUD base register region and EUD mode
> manager register regions along with the interrupt entry.
> Also add the connector to EUD which is mapped as the child
> of dwc3. The connector is attached to EUD via port. Also add
> the role-switch property to dwc3 node.
> 
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 53a21d0..2d14e5c 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -1315,6 +1315,18 @@
>  				phys = <&usb_2_hsphy>;
>  				phy-names = "usb2-phy";
>  				maximum-speed = "high-speed";
> +				usb-role-switch;
> +				usb_con: eud_usb_connector {
> +					compatible = "qcom,usb-connector-eud",
> +						     "usb-c-connector";
> +					ports {
> +						port@0 {

It is already defined that port@0 of the connector is USB HS data. Is 
that the case here? What about the SS lines?

>From the description, it sounds like the data path is DWC3 -> EUD -> 
connector. The DT structure doesn't match that.

> +							usb2_role_switch: endpoint {
> +								remote-endpoint = <&eud_ep>;
> +							};
> +						};
> +					};
> +				};
>  			};
>  		};
>  
> @@ -1339,6 +1351,19 @@
>  			interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>  		};
>  
> +		eud:  eud@...0000 {
> +			compatible = "qcom,sc7280-eud","qcom,eud";
> +			reg = <0 0x88e0000 0 0x2000>,
> +			      <0 0x88e2000 0 0x1000>;
> +			interrupt-parent = <&pdc>;
> +			interrupts = <11 IRQ_TYPE_LEVEL_HIGH>;
> +			port {
> +				eud_ep: endpoint {
> +					remote-endpoint = <&usb2_role_switch>;
> +				};
> +			};
> +		};
> +
>  		nsp_noc: interconnect@...0000 {
>  			reg = <0 0x0a0c0000 0 0x10000>;
>  			compatible = "qcom,sc7280-nsp-noc";
> -- 
> 2.7.4
> 
>