linux-kernel - [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Enable USB2 controller Micro-USB OTG

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Message-ID: <20260210143931.3324647-1-akash.kumar@oss.qualcomm.com>
Date: Tue, 10 Feb 2026 20:09:26 +0530
From: Akash Kumar <akash.kumar@....qualcomm.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Enable USB2 controller Micro-USB OTG

Enable the secondary USB controller (USB2) and its High-Speed PHY to
support OTG functionality via a Micro-USB connector.

Define a dedicated 'usb2-connector' node using the 'gpio-usb-b-connector'
compatible to handle ID and VBUS detection. Link this connector to the
DWC3 controller via OF graph ports to satisfy schema requirements and
enable role switching.

Specific hardware configuration:
- ID pin: TLMM 61
- VBUS detection: PM7325 GPIO 9
- VBUS supply: Fixed regulator controlled by TLMM 63
- Configure &usb_2 in OTG mode with role switching enabled.
- Define a gpio-usb-b-connector node for Micro-USB support, mapping the
  ID pin to TLMM 61 and VBUS detection to PM7325 GPIO 9.
- Add the 'vdd_micro_usb_vbus' fixed regulator (controlled by TLMM 63) to
  supply VBUS to the connector.
- Add the 'usb2_id_detect' pinctrl state to configure GPIO 61 for ID
  detection.
- Enable &usb_2_hsphy and populate necessary voltage supplies (VDDA PLL,
  VDDA 1.8V, VDDA 3.3V).

Signed-off-by: Akash Kumar <akash.kumar@....qualcomm.com>
---
 arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 68 ++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
index f29a352b0288..ee472d8b2db1 100644
--- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
+++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
@@ -217,6 +217,16 @@ pmic_glink_sbu_in: endpoint {
 		};
 	};
 
+	vdd_micro_usb_vbus: regulator-micro-usb-vbus {
+	       compatible = "regulator-fixed";
+	       regulator-name = "MICRO_USB_VBUS";
+	       gpio = <&tlmm 63 GPIO_ACTIVE_HIGH>;
+	       regulator-min-microvolt = <5000000>;
+	       regulator-max-microvolt = <5000000>;
+	       regulator-boot-on;
+	       enable-active-high;
+	};
+
 	vph_pwr: regulator-vph-pwr {
 		compatible = "regulator-fixed";
 		regulator-name = "vph_pwr";
@@ -262,6 +272,30 @@ active-config0 {
 		};
 	};
 
+	usb2-connector {
+		compatible = "gpio-usb-b-connector",
+			     "usb-b-connector";
+		label = "micro-USB";
+		type = "micro";
+		id-gpios = <&tlmm 61 GPIO_ACTIVE_HIGH>;
+		vbus-gpios = <&pm7325_gpios 9 GPIO_ACTIVE_HIGH>;
+		vbus-supply = <&vdd_micro_usb_vbus>;
+		pinctrl-0 = <&usb2_id_detect>;
+		pinctrl-names = "default";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				usb2_connector_ep: endpoint {
+					remote-endpoint = <&usb2_controller_ep>;
+				};
+			};
+		};
+	};
+
 	wcn6750-pmu {
 		compatible = "qcom,wcn6750-pmu";
 		pinctrl-0 = <&bt_en>;
@@ -606,6 +640,7 @@ vreg_bob_3p296: bob {
 			regulator-max-microvolt = <3960000>;
 		};
 	};
+
 };
 
 &gcc {
@@ -1137,6 +1172,12 @@ qup_uart7_sleep_tx: qup-uart7-sleep-tx-state {
 		 */
 		bias-pull-up;
 	};
+
+	usb2_id_detect: usb2-id-detect-state {
+		pins = "gpio61";
+		function = "gpio";
+		bias-pull-up;
+	};
 };
 
 &uart5 {
@@ -1200,6 +1241,33 @@ &usb_1_qmpphy {
 	status = "okay";
 };
 
+&usb_2 {
+	dr_mode = "otg";
+	usb-role-switch;
+
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			usb2_controller_ep: endpoint {
+				remote-endpoint = <&usb2_connector_ep>;
+			};
+		};
+	};
+};
+
+&usb_2_hsphy {
+	vdda-pll-supply = <&vreg_l10c_0p88>;
+	vdda18-supply = <&vreg_l1c_1p8>;
+	vdda33-supply = <&vreg_l2b_3p072>;
+
+	status = "okay";
+};
+
 &usb_dp_qmpphy_out {
 	remote-endpoint = <&redriver_phy_con_ss>;
 };
-- 
2.43.0