I just got 4 NanoPi Duos v1.1 and the OTG port functions (unlike v1.0)! This is with the FriendlyElec image. I was wondering should I compare the FriendlyElec's sun8i-h2-plus-nanopi-duo.dtb to the one on Armbian? I already tried messing with Armbian's sun8i-h2-plus-nanopi-duo.dtb by changing usb@01c19000 status = "okay" and adding dr_mode = "host". I'm not sure I can just drop in the dtb? Any way, I'll see what I can figure out. I'm excited the OTG port works now for more than just power since that saves you from buying the Mini Shield if you have a simple project that just needs a USB drive or camera.

OK, solved this by using FriendlyElec's dtb! Armbian folks may want to use this DTB instead of what's in the current distro. lsusb show thumb drive:

 

Bus 001 Device 002: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive

Maybe you can compare both DTs, it is probably just question of VBUS enable which was maybe on the wrong pin.

 

Ideally adding this to the dts should do the trick:

 

&usb_org {

   dr_mode = "host";

   status = "okay";

};

 

Since my Duo is V1.0  I can't test though ...

 

I tried modifying the existing DTS as described, but it didn't work. I'll do a diff when I have some time.

There's a lot different in the DTS. I really do not have time to see if it's just certain sections, but I'd just go with the FriendlyElec DTB. The DTS is attached.

sun8i-h2-plus-nanopi-duo-friendlyelec.dts

There's a typo in my code above - it should say &usb_otg, not &usb_org (thick fingers, sorry!):

&usb_otg {
    dr_mode = "host";
    status = "okay";
};

Did you catch that? If not, maybe give at another go with the above modification.

This tag corresponds to the following part of the friendlyelec "all-in-one" dts:

		usb@01c19000 {
			compatible = "allwinner,sun8i-h3-musb";
			reg = <0x1c19000 0x400>;
			clocks = <0x4 0x20>;
			resets = <0x4 0x11>;
			interrupts = <0x0 0x47 0x4>;
			interrupt-names = "mc";
			phys = <0x1c 0x0>;
			phy-names = "usb";
			extcon = <0x1c 0x0>;
			status = "okay";
			dr_mode = "otg";
		};

Based on that I would try exchanging "host" for "otg" in the dr_mode tag.