[PATCH] arm64: dts: imx8mp-kontron: Fix USB OTG role switching

[PATCH] arm64: dts: imx8mp-kontron: Fix USB OTG role switching

[Frieder Schrempf]

From: Frieder Schrempf <frieder.schrempf@kontron.de>

The VBUS supply regulator is currently assigned to the PHY node.
This causes the VBUS to be always on, even when the controller
needs to be switched to peripheral mode.

Fix the OTG role switching by adding a connector node and moving
the VBUS supply regulator to that node. This way the VBUS gets
correctly switched according to the current role.

Fixes: 827c007db5f2 ("arm64: dts: Add support for Kontron OSM-S i.MX8MP SoM and BL carrier board")
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
 .../dts/freescale/imx8mp-kontron-bl-osm-s.dts | 24 +++++++++++++++----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts b/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts
index 614b4ce330b1c..0924ac50fd2db 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts
@@ -16,11 +16,20 @@ aliases {
 		ethernet1 = &eqos;
 	};
 
-	extcon_usbc: usbc {
-		compatible = "linux,extcon-usb-gpio";
+	connector {
+		compatible = "gpio-usb-b-connector", "usb-b-connector";
+		id-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+		label = "Type-C";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_usb1_id>;
-		id-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+		type = "micro";
+		vbus-supply = <&reg_usb1_vbus>;
+
+		port {
+			usb_dr_connector: endpoint {
+				remote-endpoint = <&usb3_dwc>;
+			};
+		};
 	};
 
 	leds {
@@ -244,9 +253,15 @@ &usb_dwc3_0 {
 	hnp-disable;
 	srp-disable;
 	dr_mode = "otg";
-	extcon = <&extcon_usbc>;
 	usb-role-switch;
+	role-switch-default-mode = "peripheral";
 	status = "okay";
+
+	port {
+		usb3_dwc: endpoint {
+			remote-endpoint = <&usb_dr_connector>;
+		};
+	};
 };
 
 &usb_dwc3_1 {
@@ -273,7 +288,6 @@ &usb3_1 {
 };
 
 &usb3_phy0 {
-	vbus-supply = <&reg_usb1_vbus>;
 	status = "okay";
 };
 
-- 
2.51.0

Re: [PATCH] arm64: dts: imx8mp-kontron: Fix USB OTG role switching

[Shawn Guo]

On Mon, Oct 20, 2025 at 03:21:51PM +0200, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
> 
> The VBUS supply regulator is currently assigned to the PHY node.
> This causes the VBUS to be always on, even when the controller
> needs to be switched to peripheral mode.
> 
> Fix the OTG role switching by adding a connector node and moving
> the VBUS supply regulator to that node. This way the VBUS gets
> correctly switched according to the current role.
> 
> Fixes: 827c007db5f2 ("arm64: dts: Add support for Kontron OSM-S i.MX8MP SoM and BL carrier board")
> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>

Applied, thanks!