Seb042

@royk
Finally working for the spi bus.
As I didn't know what I may did wrong, I reinstalled the system, read better the doc as you suggested (the first example they show it's not the standard configuration, confusing for me at first),  and finally I chose the right overlay. 
My armbianEnv.txt is like this to make it works:
 
verbosity=1
bootlogo=true
overlay_prefix=rockchip-rk3588
fdtfile=rockchip/rk3588-orangepi-5-plus.dtb
rootdev=UUID=2cc7a9a6-afc7-4cd4-b377-6f83f2e1bf50
rootfstype=ext4
overlays=rk3588-spi0-m2-cs0-cs1-spidev
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u
 
I'm using the cs0-cs1 because I will need both later as I will use rotary encoders. 
I assume it will be the same for i2c bus, I will have to choose the right overlay.
I still don't know which one would be for the i2s, but I should find that somewhere in the documentation I hope.
 
Thanks for the answers and the tip for how to load user overlays.