I see in this link that one configuration for the Steam Controller already exists: https://github.com/libretro/retroarch-joypad-autoconfig/tree/master/udev
If I understand correctly that is the file for auto configure the controller, the thing is that in my case when I try to bind the keys myself I can only bind about two keys, in the rest the controller don’t work. The only thing I can do is navigate the menus poorly with the left touchpad imitating a D-Pad.
Any ideas?