~# grep "" /sys/class/gpio/gpiochip*/*
/sys/class/gpio/gpiochip404/base:404
/sys/class/gpio/gpiochip404/label:0-0020
/sys/class/gpio/gpiochip404/ngpio:8
/sys/class/gpio/gpiochip412/base:412
/sys/class/gpio/gpiochip412/label:aobus-banks
/sys/class/gpio/gpiochip412/ngpio:15
/sys/class/gpio/gpiochip427/base:427
/sys/class/gpio/gpiochip427/label:periphs-banks
/sys/class/gpio/gpiochip427/ngpio:85