Hi,
Simple test to demonstrate failure:
[root@RPi3-1 ryniker]# echo 23 >/sys/class/gpio/export
bash: echo: write error: Invalid argument
[root@RPi3-1 ryniker]#
Just the numbering is different for some reason.
raspberrypi kernel:
kraxel@pitivi ~# cat /sys/class/gpio/gpiochip0/base
0
mainline kernel:
kraxel@pi-two ~# cat /sys/class/gpio/gpiochip458/base
458
cheers,
Gerd