Jernej ?krabec:

I guess that would mean also including connector node (hdmi_con_in) in DTSI, 
since it is referenced inside. However, not all boards have HDMI connector, so 
I didn't include it in DTSI.

You're absolutely right on this. I wish there was someway to get rid of
this duplication but that's a whole different problem to discuss.

Great work by the way!

Joonas