Hi LDiego,
I have not used linux on arduino before but I now have linux installed and operating on arduino.
From this blog you suggested (Sergey's Blog - Malinov Family Web Presence), I can see that typing once the analog port is connected, the value at A0 can be read with
root@clanton:~# cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw
But how fast is continuous read?
Thank you.