[PATCH] arm64: dts: qcom: eliza-mtp: Add WCD9390 USB-SS mux for DP alt mode

[PATCH] arm64: dts: qcom: eliza-mtp: Add WCD9390 USB-SS mux for DP alt mode

[Balaji Kalkonda]

The WCD9390 USB-SS mux routes the AUX/SBU lines between the USB-C
connector and the DP PHY, but eliza-mtp lacks the devicetree node for
it. Without a physical path for AUX, every DPCD probe times out and
the display never comes up:

  msm_dpu ae01000.display-controller: [drm:drm_dp_dpcd_probe [drm_display_helper]] dpu_dp_aux: 0x00102 AUX -> (ret=-110)
  msm_dpu ae01000.display-controller: [drm:msm_dp_bridge_hpd_notify [msm]] type=10 link hpd_link_status=0x0, status=2
  [drm:msm_dp_bridge_detect [msm]] failed to read caps
  [drm:msm_dp_bridge_detect [msm]] aux not connected

Add the wcd_usbss typec-mux node on i2c3, along with its supply and
reset line, and wire its SBU endpoint to a new port on the pmic-glink
connector. This gives the AUX/SBU signals a physical path from the
USB-C connector through the mux to the DP PHY.

Signed-off-by: Balaji Kalkonda <balaji.kalkonda@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/eliza-mtp.dts | 36 ++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/eliza-mtp.dts b/arch/arm64/boot/dts/qcom/eliza-mtp.dts
index ee05192adcfb..d848ae77ab85 100644
--- a/arch/arm64/boot/dts/qcom/eliza-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/eliza-mtp.dts
@@ -96,6 +96,14 @@ pmic_glink_ss_in: endpoint {
 						remote-endpoint = <&usb_dp_qmpphy_out>;
 					};
 				};
+
+				port@2 {
+					reg = <2>;
+
+					pmic_glink_sbu: endpoint {
+						remote-endpoint = <&wcd_usbss_sbu_mux>;
+					};
+				};
 			};
 		};
 	};
@@ -112,6 +120,34 @@ vph_pwr: regulator-vph-pwr {
 	};
 };
 
+&i2c3 {
+	status = "okay";
+
+	wcd_usbss: typec-mux@e {
+		compatible = "qcom,wcd9390-usbss";
+		reg = <0xe>;
+
+		vdd-supply = <&vreg_l7b>;
+		reset-gpios = <&tlmm 152 GPIO_ACTIVE_HIGH>;
+
+		mode-switch;
+		orientation-switch;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				wcd_usbss_sbu_mux: endpoint {
+					remote-endpoint = <&pmic_glink_sbu>;
+				};
+			};
+		};
+	};
+};
+
 &apps_rsc {
 	regulators-0 {
 		compatible = "qcom,pm7550-rpmh-regulators";

---
base-commit: 793807ca13bf3072fc6d16ce6d90e9ab9beff2a5
change-id: 20261111-eliza-wcd-mux-fix-453716a9c1a9

Best regards,
--  
Balaji Kalkonda <balaji.kalkonda@oss.qualcomm.com>

Re: [PATCH] arm64: dts: qcom: eliza-mtp: Add WCD9390 USB-SS mux for DP alt mode

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential
issue to consider:
- [Low] arm64: dts: qcom: eliza-mtp: &i2c3 node placed out of
  alphabetical order
--

commit dceba04a5137daf6908c61ec04a54977dab1b62a
Author: Balaji Kalkonda <balaji.kalkonda@oss.qualcomm.com>

arm64: dts: qcom: eliza-mtp: Add WCD9390 USB-SS mux for DP alt mode

This commit adds the WCD9390 USB-SS typec-mux node on i2c3 and wires its
SBU endpoint to the pmic-glink USB-C connector on eliza-mtp.

> diff --git a/arch/arm64/boot/dts/qcom/eliza-mtp.dts b/arch/arm64/boot/dts/qcom/eliza-mtp.dts
> index ee05192adcfb9..d848ae77ab851 100644
> --- a/arch/arm64/boot/dts/qcom/eliza-mtp.dts
> +++ b/arch/arm64/boot/dts/qcom/eliza-mtp.dts
[ ... ]
> @@ -112,6 +120,34 @@ vph_pwr: regulator-vph-pwr {
>  	};
>  };
>  
> +&i2c3 {
> +	status = "okay";
> +
> +	wcd_usbss: typec-mux@e {
> +		compatible = "qcom,wcd9390-usbss";
> +		reg = <0xe>;
> +
> +		vdd-supply = <&vreg_l7b>;
> +		reset-gpios = <&tlmm 152 GPIO_ACTIVE_HIGH>;
> +
> +		mode-switch;
> +		orientation-switch;
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +
> +				wcd_usbss_sbu_mux: endpoint {
> +					remote-endpoint = <&pmic_glink_sbu>;
> +				};
> +			};
> +		};
> +	};
> +};
> +
>  &apps_rsc {
>  	regulators-0 {
>  		compatible = "qcom,pm7550-rpmh-regulators";

[Severity: Low]
Should &i2c3 be placed between &gpu_zap_shader and &mdss to keep the
phandle-referenced nodes in alphabetical order?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261112-eliza-wcd-mux-fix-v1-1-70c521781ac1@oss.qualcomm.com?part=1