USB Device Mode

[R0b0t1]

I made progress. The default device tree sets the first dwc3 controller as "otg." Unfortunately this seems to not have much effect. I've tried looking for a software switch and also tried plugging the board in as a device. How do you set this without needing a reboot?

Changing the two DWC3 nodes in the file "arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi:"

Code:

&usbdrd3_0 {
        status = "okay";
};

&usbdrd_dwc3_0 {
        status = "okay";
        dr_mode = "peripheral";
};

&usbdrd3_1 {
        status = "okay";
};

&usbdrd_dwc3_1 {

Code:

        status = "okay";

Code:

        dr_mode = "peripheral";

Code:

};

They are both listed in /sys/class/udc:

Code:

# ls /sys/class/udc
fe800000.usb  fe900000.usb

But, again, I'd like to change mode without needing to reboot. I'm also unsure how compatible the Type-C port is.