BPI‑M4 Zero : how to force USB0 (Type‑C OTG) into host mode on Armbian?

[Samor140]

Hi,

Board: BPI‑M4 Zero
OS: Armbian (Bookworm), kernel 6.12.35 (current)

This board has two USB‑C ports: one fixed HOST and one OTG. I’d like the OTG port (USB0) to operate as a host as well. I can’t find any Armbian overlay in armbian-config or on the forums that flips USB0 to host.

 

If anyone has this working, it would be cool to let me know .

Thanks!

Edited 6 hours ago by Samor140

[Werner]

If there is no overlay available you may need to write one by yourself.

I'd start by modifying the device tree itself and set the port in question to host and see if this actually works.

I think armbian-config comes with a device tree editor. Make sure to make a backup beforehand.

[Samor140]

Device tree it is. I will follow up if i have any success.

Thanks !

[c0rnelius]

HOST

/dts-v1/;
/plugin/;

/ {
	fragment@0 {
		target = <&usbotg>;
		__overlay__ {
			dr_mode = "host";
		};
	};
};

 

OTG

/dts-v1/;
/plugin/;

/ {
	fragment@0 {
		target = <&usbotg>;
		__overlay__ {
			dr_mode = "otg";
		};
	};
};

 

By default it is set to peripheral.

[Samor140]

Thanks c0rnelius, this works.