SPI/I2C with NanoPi Duo2

Hi there  👋

I'm using a NanoPi Duo2 with 

Armbian 21.08.1 Bullseye

and

Linux jenkins-agent-arm32 5.15.93-sunxi #23.02.2 SMP Fri Feb 17 23:49:46 UTC 2023 armv7l GNU/Linux

I want to use an SPI screen on it, but I don't know which library to use to handle the GPIO...
I've tested quite a few and none of them seem to work.
I have enabled SPI and I2C in `armbian-config` and `sudo i2cdetect -y 0` works (even if nothing is found), but what is the next step?

 sudo i2cdetect -y 0
[sudo] password for poddingue:
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
poddingue@jenkins-agent-arm32:~$ ls /dev/i2c*
/dev/i2c-0

What library/tool should I install to get the `gpio` command for example?

Thanks.