Hi

 

I want to work with g_audio drivers on the usb type c otg port.

When I build the image with current kernel, by applying the following overlay (I only change dr_mode to peripheral)  i am able to convert the usb port in peripheral mode and successfully load the g_audio drivers and audio interfaces also come up.

/dts-v1/;
/plugin/;

/ {
    compatible = "rockchip,rk3588s";

    fragment@0 {
        target = <&usb_host0_xhci>;  // This matches the label in the device tree

        __overlay__ {
            dr_mode = "peripheral";
        };
    };
};

But when i want to do similar with the vendor kernel, which has different device tree, changing dr_mode doesn't work.

/dts-v1/;
/plugin/;

/ {
    compatible = "rockchip,rk3588s";

    fragment@0 {
        target = <&usbdrd3_0>;  // Target the usbdrd3_0 node

        __overlay__ {
            usb@fc000000 {
                dr_mode = "peripheral";  // Change dr_mode to peripheral
            };
        };
    };
};

The device trees for usb type c port for both kernels are as below -

//***This node is of current kernel***
usb@fc000000 {
		power-domains = <0x21 0x1f>;
		snps,dis-u1-entry-quirk;
		snps,dis_enblslpm_quirk;
		phy-names = "usb2-phy\0usb3-phy";
		clock-names = "ref_clk\0suspend_clk\0bus_clk";
		snps,dis-u2-freeclk-exists-quirk;
		usb-role-switch;
		phy_type = "utmi_wide";
		resets = <0x1f 0x152>;
		interrupts = <0x00 0xdc 0x04 0x00>;
		clocks = <0x1f 0x194 0x1f 0x193 0x1f 0x192>;
		snps,dis-u2-entry-quirk;
		compatible = "rockchip,rk3588-dwc3\0snps,dwc3";
		snps,dis-del-phy-power-chg-quirk;
		status = "okay";
		phys = <0x23 0x24 0x04>;
		reg = <0x00 0xfc000000 0x00 0x400000>;
		phandle = <0x116>;
		dr_mode = "peripheral";
		snps,dis-tx-ipgap-linecheck-quirk;

		port {

			endpoint {
				remote-endpoint = <0x25>;
				phandle = <0xeb>;
			};
		};
	};


------------
dmesg output
[   15.417624] i2c 6-0022: deferred probe pending: typec_fusb302: cannot register tcpm port
[  600.475296] g_audio gadget.0: Linux USB Audio Gadget, version: Feb 2, 2012
[  600.475317] g_audio gadget.0: g_audio ready

Vendor Kernel

//***This node is of vendor kernel
	usbdrd3_0 {
		#address-cells = <0x02>;
		clock-names = "ref\0suspend\0bus";
		clocks = <0x02 0x1a3 0x02 0x1a2 0x02 0x1a1>;
		#size-cells = <0x02>;
		compatible = "rockchip,rk3588-dwc3\0rockchip,rk3399-dwc3";
		ranges;
		status = "okay";
		phandle = <0x22b>;

		usb@fc000000 {
			power-domains = <0x06 0x1f>;
			snps,dis-u1-entry-quirk;
			snps,dis_enblslpm_quirk;
			phy-names = "usb2-phy\0usb3-phy";
			snps,dis-u2-freeclk-exists-quirk;
			usb-role-switch;
			phy_type = "utmi_wide";
			quirk-skip-phy-init;
			resets = <0x02 0x2a4>;
			interrupts = <0x00 0xdc 0x04>;
			snps,dis-u2-entry-quirk;
			compatible = "snps,dwc3";
			snps,parkmode-disable-hs-quirk;
			snps,dis-del-phy-power-chg-quirk;
			status = "okay";
			snps,parkmode-disable-ss-quirk;
			phys = <0x74 0x75>;
			reg = <0x00 0xfc000000 0x00 0x400000>;
			phandle = <0x22c>;
			dr_mode = "otg";
			reset-names = "usb3-otg";
			snps,dis-tx-ipgap-linecheck-quirk;

			port {
				#address-cells = <0x01>;
				#size-cells = <0x00>;

				endpoint@0 {
					remote-endpoint = <0x76>;
					reg = <0x00>;
					phandle = <0x183>;
				};
			};
		};
	};

//dmesg output
[   41.238153] [GTP-ERR][__do_register_ext_module:79] Module [goodix-fwu] timeout
[  243.574594] g_audio gadget.0: Hardware params: access 3, format 2, channels 2, rate 48000
[  243.574756] g_audio gadget.0: Linux USB Audio Gadget, version: Feb 2, 2012
[  243.574773] g_audio gadget.0: g_audio ready
[  243.578558] typec_fusb302 6-0022: Looking up vbus-supply from device tree
[  243.581576] dwc3 fcd00000.usb: device reset

Can some one help me what kind of overlay should i make to convert the port to peripheral mode.

 

phys = <0x74 0x75>;
            reg = <0x00 0xfc000000 0x00 0x400000>;
            phandle = <0x22c>;
            dr_mode = "otg";
            reset-names = "usb3-otg";
            snps,dis-tx-ipgap-linecheck-quirk;

 

On vendor should this "dr_mode = "otg" become
            dr_mode = "peripheral"; ?