Re: [PATCH v2 08/11] arm64: dts: qcom: sm8350-hdk: add pmic glink node

[Bjorn Andersson]

On Fri, Feb 10, 2023 at 04:02:11PM +0100, Neil Armstrong wrote:
> Add the pmic glink node linked with the DWC3 USB controller
> switched to OTG mode and tagged with usb-role-switch.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/qcom/sm8350-hdk.dts | 77 ++++++++++++++++++++++++++++-----
>  1 file changed, 65 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8350-hdk.dts b/arch/arm64/boot/dts/qcom/sm8350-hdk.dts
> index 54654eb75c28..28fc9a835c5d 100644
> --- a/arch/arm64/boot/dts/qcom/sm8350-hdk.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8350-hdk.dts
> @@ -31,6 +31,40 @@ hdmi_con: endpoint {
>  		};
>  	};
>  
> +	pmic-glink {
> +		compatible = "qcom,sm8350-pmic-glink", "qcom,pmic-glink";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		connector@0 {
> +			compatible = "usb-c-connector";
> +			reg = <0>;
> +			power-role = "dual";
> +			data-role = "dual";
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +
> +					pmic_glink_hs_in: endpoint {
> +						remote-endpoint = <&usb_1_dwc3_hs>;
> +					};
> +				};
> +
> +				port@1 {
> +					reg = <1>;
> +
> +					pmic_glink_ss_in: endpoint {
> +						remote-endpoint = <&usb_1_dwc3_ss>;
> +					};
> +				};
> +			};
> +		};
> +	};
> +
>  	vph_pwr: vph-pwr-regulator {
>  		compatible = "regulator-fixed";
>  		regulator-name = "vph_pwr";
> @@ -666,23 +700,42 @@ &usb_1 {
>  };
>  
>  &usb_1_dwc3 {
> -	/* TODO: Define USB-C connector properly */
> -	dr_mode = "peripheral";
> -};
> +	dr_mode = "otg";
> +	usb-role-switch;
>  
> -&usb_1_hsphy {
> -	status = "okay";
> +	ports {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
>  
> -	vdda-pll-supply = <&vreg_l5b_0p88>;
> -	vdda18-supply = <&vreg_l1c_1p8>;
> -	vdda33-supply = <&vreg_l2b_3p07>;
> +		port@0 {
> +			reg = <0>;
> +
> +			usb_1_dwc3_hs: endpoint {
> +				remote-endpoint = <&pmic_glink_hs_in>;
> +			};
> +		};
> +
> +		port@1 {
> +			reg = <1>;
> +
> +			usb_1_dwc3_ss: endpoint {
> +				remote-endpoint = <&pmic_glink_ss_in>;

The connector is indeed the next active component on the SuperSpeed
lanes for USB. But as you're targeting to introduce QMP on that path,
connector@0/port@1 would be pointing to QMP/ports/port@N.

Do you plan to express the datapath between USB and QMP using this port
at that time? (It's the correct thing to do...)

Or will we not describe the SS lanes in this scenario?

Regards,
Bjorn

> +			};
> +		};
> +	};
>  };
>  
> -&usb_1_qmpphy {
> -	status = "okay";
> +&usb_1_dwc3 {
> +	dr_mode = "otg";
> +	usb-role-switch;
> +};
>  
> -	vdda-phy-supply = <&vreg_l6b_1p2>;
> -	vdda-pll-supply = <&vreg_l1b_0p88>;
> +&usb_1_dwc3_hs {
> +	remote-endpoint = <&pmic_glink_hs_in>;
> +};
> +
> +&usb_1_dwc3_ss {
> +	remote-endpoint = <&pmic_glink_ss_in>;
>  };
>  
>  &usb_2 {
> 
> -- 
> 2.34.1
>