I haven't gotten my ps3 controller to work.. the light goes to '1' as if it is connected after a one time usb plug-in, but it doesn't get recognized. (s7 edge)
Edit: I've been using the regular charging cable that came with the ps3 and controller.
I'm not sure if an OTG cable would work as I think that little 'USB connector' (Micro/regular) that came with the s7 is basically an otg connector.
Alternatively, I've tried the steam controller but it will only act as a mouse. Ive tried mapping the keys but only a few are actually recognized. It won't connect at all when in the Gear VR.