Debain i2c driver builtin no /dev/i2c-*

Question

I've a problem and can't solve it by myself, soo...

I have an OrangePi zero and I use Debian on it. The i2C module is a buildin driver but I don't know how to use it.

$ uname -a
Linux d621 5.3.5+ #2 SMP Fri Nov 15 16:24:33 CST 2019 armv7l GNU/Linux

$ find /sys/bus/platform -name *i2c*
/sys/bus/platform/drivers/mv64xxx_i2c
/sys/bus/platform/drivers/brcmstb-i2c

$ modprobe -D modprobe -D brcmstb-i2c
builtin i2c_brcmstb

$ modprobe i2c-brcmstb --first-time
modprobe: ERROR: could not insert 'i2c_brcmstb': Module already in kernel

Even though the module is already loaded in the kernel, I've no /dev/i2c-* . Someone can help me to get them.

EDIT: i2c-dev already builtin

$ modprobe i2c-dev -D
builtin i2c_dev

EDIT 2:

$ cat /boot/orangepiEnv.txt 
verbosity=1
logo=disabled
console=both
disp_mode=1920x1080p60
overlay_prefix=sun8i-h3
overlays=i2c0 i2c1 i2c2

dmesg

Answer 1

My guess is that you need to load i2c-dev module as well, so just check that one if it's built in or loaded. Also read through the demsg output, probably gives a hint if something goes wrong. If you can't find it, just share the dmesg output here, and we can look further