Hi,
With last SDL2, you can participe to add your game controller mapping to SDL2.

A MorphOS community source database of game controller mappings to be used with SDL2 Game Controller functionality is available here : https://github.com/BeWorld2018/gamecontrollerdb.txt/blob/master/README.md

In SDL2 archive, you can find directory "gamecontroller".
It's a shell program, just launch it and you can mapping your joystick, example : "gamecontroller 0".

Thanks for your participation !