MTP8750 does not have audio jack connected and relies on USB mux
(WCD9395).  Add necessary nodes for proper audio headset support along
with USB Type-C altmode and orientation.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 51 +++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
index 68644eccdbff..a08bedd2987e 100644
--- a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
@@ -54,6 +54,15 @@ wcd939x: audio-codec {
 		vdd-px-supply = <&vreg_l2i_1p2>;
 
 		#sound-dai-cells = <1>;
+
+		mode-switch;
+		orientation-switch;
+
+		port {
+			wcd_codec_headset_in: endpoint {
+				remote-endpoint = <&wcd_usbss_headset_out>;
+			};
+		};
 	};
 
 	chosen {
@@ -230,6 +239,7 @@ port@2 {
 					reg = <2>;
 
 					pmic_glink_sbu: endpoint {
+						remote-endpoint = <&wcd_usbss_sbu_mux>;
 					};
 				};
 			};
@@ -925,6 +935,42 @@ vreg_l7n_3p3: ldo7 {
 	};
 };
 
+&i2c3 {
+	status = "okay";
+
+	wcd_usbss: typec-mux@e {
+		compatible = "qcom,wcd9395-usbss", "qcom,wcd9390-usbss";
+		reg = <0xe>;
+
+		vdd-supply = <&vreg_l15b_1p8>;
+		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>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				wcd_usbss_headset_out: endpoint {
+					remote-endpoint = <&wcd_codec_headset_in>;
+				};
+			};
+		};
+	};
+};
+
 &lpass_vamacro {
 	pinctrl-0 = <&dmic01_default>, <&dmic23_default>;
 	pinctrl-names = "default";
@@ -1087,6 +1133,11 @@ &pmih0108_eusb2_repeater {
 	vdd3-supply = <&vreg_l5b_3p1>;
 };
 
+&qup_i2c3_data_clk {
+	/* Use internal I2C pull-up */
+	bias-pull-up = <2200>;
+};
+
 &qupv3_1 {
 	status = "okay";
 };

-- 
2.51.0

On Tue, Dec 16, 2025 at 05:47:33PM +0100, Krzysztof Kozlowski wrote:
> MTP8750 does not have audio jack connected and relies on USB mux
> (WCD9395).  Add necessary nodes for proper audio headset support along
> with USB Type-C altmode and orientation.

Nit: accessory mode, not altmode.

> 
> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 51 +++++++++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 

-- 
With best wishes
Dmitry