OK3588 5.10.209 Buildroot Modifying TypeC0 and TypeC1 to Type A-Host

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Revision History

Date	Version	Revision History
03/06/2025	V1.0	Initial Version

Modifying TypeC0 and TypeC1 to Type A-Host

This method needs jump wire test on the Forlinx carrier board.

The related patch file:

TypeC-to-TypeAhost.patch

Background

Many customers prefer Type-A interfaces over Type-C interfaces when designing their custom carrier boards. Accordingly, this solution modifies the SoM’s Type-C port to function as a Type-A Host interface.

1. Software Modification: Device Tree

diff --git a/arch/arm64/boot/dts/rockchip/OK3588-C-common.dtsi b/arch/arm64/boot/dts/rockchip/OK3588-C-common.dtsi
index 6dc06d53e..46eaf4f4a 100644
--- a/arch/arm64/boot/dts/rockchip/OK3588-C-common.dtsi
+++ b/arch/arm64/boot/dts/rockchip/OK3588-C-common.dtsi
@@ -719,72 +719,6 @@
         status = "okay";
     };
 
-	usbc0: fusb302@22 {
-		compatible = "fcs,fusb302";
-		reg = <0x22>;
-		interrupt-parent = <&gpio1>;
-		interrupts = <RK_PB0 IRQ_TYPE_LEVEL_LOW>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&usbc0_int>;
-		vbus-supply = <&vbus5v0_typec0>;
-		status = "okay";
-
-		ports {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			port@0 {
-				reg = <0>;
-				usbc0_role_sw: endpoint@0 {
-					remote-endpoint = <&dwc3_0_role_switch>;
-				};
-			};
-		};
-
-		usb_con0: connector {
-			compatible = "usb-c-connector";
-			label = "USB-C";
-			data-role = "dual";
-			power-role = "dual";
-			try-power-role = "sink";
-			op-sink-microwatt = <1000000>;
-			sink-pdos =
-				<PDO_FIXED(5000, 1000, PDO_FIXED_USB_COMM)>;
-			source-pdos =
-				<PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>;
-
-			altmodes {
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				altmode@0 {
-					reg = <0>;
-					svid = <0xff01>;
-					vdo = <0xffffffff>;
-				};
-			};
-
-			ports {
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				port@0 {
-					reg = <0>;
-					usbc0_orien_sw: endpoint {
-						remote-endpoint = <&usbdp_phy0_orientation_switch>;
-					};
-				};
-
-				port@1 {
-					reg = <1>;
-					dp0_altmode_mux: endpoint {
-						remote-endpoint = <&usbdp_phy0_dp_altmode_mux>;
-					};
-				};
-			};
-		};
-	};
-
 };
 
 &i2c3 {
@@ -846,71 +780,6 @@
 		status = "okay";
 	};
 
-	usbc1: fusb302@22 {
-		compatible = "fcs,fusb302";
-		reg = <0x22>;
-		interrupt-parent = <&gpio1>;
-		interrupts = <RK_PB3 IRQ_TYPE_LEVEL_LOW>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&usbc1_int>;
-		vbus-supply = <&vbus5v0_typec1>;
-		status = "okay";
-
-		ports {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			port@0 {
-				reg = <0>;
-				usbc1_role_sw: endpoint@0 {
-					remote-endpoint = <&dwc3_1_role_switch>;
-				};
-			};
-		};
-
-		usb_con1: connector {
-			compatible = "usb-c-connector";
-			label = "USB-C";
-			data-role = "dual";
-			power-role = "dual";
-			try-power-role = "sink";
-			op-sink-microwatt = <1000000>;
-			sink-pdos =
-				<PDO_FIXED(5000, 1000, PDO_FIXED_USB_COMM)>;
-			source-pdos =
-				<PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>;
-
-			altmodes {
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				altmode@0 {
-					reg = <0>;
-					svid = <0xff01>;
-					vdo = <0xffffffff>;
-				};
-			};
-
-			ports {
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				port@0 {
-					reg = <0>;
-					usbc1_orien_sw: endpoint {
-						remote-endpoint = <&usbdp_phy1_orientation_switch>;
-					};
-				};
-
-				port@1 {
-					reg = <1>;
-					dp1_altmode_mux: endpoint {
-						remote-endpoint = <&usbdp_phy1_dp_altmode_mux>;
-					};
-				};
-			};
-		};
-	};
 };
 
 &i2c7 {
@@ -1256,11 +1125,12 @@
 };
 
 &u2phy0_otg {
+	phy-supply = <&vbus5v0_typec0>;
 	status = "okay";
 };
 
 &u2phy1_otg {
-	phy-supply = <&vcc5v0_sys>;
+	phy-supply = <&vbus5v0_typec1>;
 	status = "okay";
 };
 
@@ -1290,25 +1160,7 @@
 
 &usbdp_phy0 {
 	status = "okay";
-	orientation-switch;
	rockchip,dp-lane-mux = <2 3>;
-	svid = <0xff01>;
-	sbu1-dc-gpios = <&gpio4 RK_PA0 GPIO_ACTIVE_HIGH>;
-	sbu2-dc-gpios = <&gpio4 RK_PB0 GPIO_ACTIVE_HIGH>;
-
-	port {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		usbdp_phy0_orientation_switch: endpoint@0 {
-			reg = <0>;
-			remote-endpoint = <&usbc0_orien_sw>;
-		};
-
-		usbdp_phy0_dp_altmode_mux: endpoint@1 {
-			reg = <1>;
-			remote-endpoint = <&dp0_altmode_mux>;
-		};
-	};
 };
 
 &usbdp_phy0_dp {
@@ -1324,40 +1176,14 @@
 };
 
 &usbdrd_dwc3_0 {
-	dr_mode = "otg";
-	usb-role-switch;
+	dr_mode = "host";
 	status = "okay";
-	port {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		dwc3_0_role_switch: endpoint@0 {
-			reg = <0>;
-			remote-endpoint = <&usbc0_role_sw>;
-		};
-	};
 };
 
 &usbdp_phy1 {
 	status = "okay";
-	orientation-switch;
	rockchip,dp-lane-mux = <2 3>;
-	svid = <0xff01>;
-	sbu1-dc-gpios = <&gpio4 RK_PA1 GPIO_ACTIVE_HIGH>;
-	sbu2-dc-gpios = <&gpio4 RK_PA2 GPIO_ACTIVE_HIGH>;
-
-	port {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		usbdp_phy1_orientation_switch: endpoint@0 {
-			reg = <0>;
-			remote-endpoint = <&usbc1_orien_sw>;
-		};
-
-		usbdp_phy1_dp_altmode_mux: endpoint@1 {
-			reg = <1>;
-			remote-endpoint = <&dp1_altmode_mux>;
-		};
-	};
 };
 
 &usbdp_phy1_dp {
@@ -1374,16 +1200,7 @@
 
 &usbdrd_dwc3_1 {
 	status = "okay";
-	dr_mode = "otg";
-	usb-role-switch;
-	port {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		dwc3_1_role_switch: endpoint@0 {
-			reg = <0>;
-			remote-endpoint = <&usbc1_role_sw>;
-		};
-	};
+	dr_mode = "host";
 };
 
 &usbhost3_0 {

Apply the above patch to the device tree file. Take the device tree file of 3588 Linux5.10.209 as an example: kernel/arch/arm64/boot/dts/rockchip/OK3588 - C - common.dtsi.

Apply the patch file to the kernel:


Compile the kernel and burn the boot.img image to verify the function.

2. Hardware Modification

To test the Type - A - Host function on the Forlinx carrier board, an external Type - A socket is required. The connections are as follows:


At the Type - C0 port, connect the six wires in the above red - framed area, plus the power line and GND.


The same goes for Type - C1.

PS: Since USB3.0 is a high - speed signal line with relatively high requirements for signal rate, the length of the jump wires should be as short as possible.

3. Function Verification

3.1 Type - C0

Update the boot to the SoM. With the hardware modifications completed, insert a USB flash drive at the Type - C0 port.

Usefdisk -lcommands to query the USB flash drive.


You can see that the USB flash drive has been recognized.

Open /run/media/sda1, and you can see that the USB flash drive has been successfully mounted.


3.2 Type - C1

fdisk -l Query the USB flash drive.


Open /run/media/sdb1, and you can see that the USB flash drive has been successfully mounted.