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.
