RetroArch 1.9.1 brings a new gamepad and notch support on Android
use a remote controler like wiimote with retroArch - General Support - LibreELEC Forum
To get all these controllers to to play nice with each other on one pc took 5 seperate retroarch installs running independent from one another, usb hub with switches, wii u adapter,
RetroArch input and joypad drivers
Lakka documentation - Input settings
Can't get Controller to work - Android devices - Libretro Forums
How to bind controller buttons in Retroarch on Linux
RetroArch (Android) Tutorial | Video Game Emulation for Newbies
Retroarch WiiU (wip.) | GBAtemp.net - The Independent Video Game Community
Gamepad not working · Issue #11418 · libretro/RetroArch · GitHub