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humanoid2050

Working USB OTG on NanoPi Neo Core2 LTS and NanoPi Neo Air

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I've got a NanoPi Neo Core 2 and a NanoPi Neo Air. It bothered me that the USB OTG did not function in host mode. Turns out, the included Armbian .dtb's don't have the parts necessary to define the regulator which pushes power back to a client device when the board needs to run in OTG host mode. You can see the regulator on page 8 of the schematic

 

http://wiki.friendlyarm.com/wiki/images/6/6b/NanoPi_NEO_Core2-V1.0_1707.pdf

 

I found an upstream patch at

 

https://patchwork.kernel.org/patch/9921097/

 

which defined the missing parts for a Neo Plus 2. I put the relevant parts into an overlay dts file (attached) that can be loaded with

 

sudo armbian-add-overlay otg.dts

 

I've tested this on both of my devices. I assume it should work on other devices with the same wiring.

 

One quirk I didn't figure out though... online sources all used "GPIO_ACTIVE_HIGH" as a kind of defined value, but the version of 'dtc' included with Armbian chokes on it. So instead I just in the equivalent numeric value.

otg.dts

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11 hours ago, humanoid2050 said:

One quirk I didn't figure out though... online sources all used "GPIO_ACTIVE_HIGH" as a kind of defined value, but the version of 'dtc' included with Armbian chokes on it. So instead I just in the equivalent numeric value.

The reason is when compiling Main DT, the compiler has access to kernel header, but when compiling overlays, you can't include those headers ...

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

 

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Fair enough. I'm not too worried though, as the long term solution really needs to be folding this into the Armbian or upstream kernel sources so that it builds with the system as a whole. This is just a bandaid for people who want USB OTG right now.

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