gpio-demo.dtsi results

# see https://github.com/mvduin/overlay-utils/blob/master/gpio-demo.dtsi

~$ ls -l /dev/gpio
total 0
lrwxrwxrwx 1 root root 22 Jun 29 06:34 button -> /sys/class/gpio/gpio66/
lrwxrwxrwx 1 root root 22 Jun 29 06:34 input-bidi -> /sys/class/gpio/gpio69/
lrwxrwxrwx 1 root root 22 Jun 29 06:34 output-bidi -> /sys/class/gpio/gpio68/
lrwxrwxrwx 1 root root 22 Jun 29 06:34 reset-thing -> /sys/class/gpio/gpio67/


~$ ls -l /dev/gpio/*/direction
-r--r--r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/button/direction
-rw-rw-r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/input-bidi/direction
-rw-rw-r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/output-bidi/direction
-r--r--r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/reset-thing/direction

~$ for i in /dev/gpio/*/direction; do printf '%4s %s\n' $(cat $i) $i; done
  in /dev/gpio/button/direction
  in /dev/gpio/input-bidi/direction
 out /dev/gpio/output-bidi/direction
 out /dev/gpio/reset-thing/direction


~$ ls -l /dev/gpio/*/value
-r--r--r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/button/value
-rw-rw-r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/input-bidi/value
-rw-rw-r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/output-bidi/value
-rw-rw-r-- 1 root gpio 4096 Jun 29 06:34 /dev/gpio/reset-thing/value

~$ for i in /dev/gpio/*/value; do printf '%4s %s\n' $(cat $i) $i; done
   0 /dev/gpio/button/value
   1 /dev/gpio/input-bidi/value
   0 /dev/gpio/output-bidi/value
   0 /dev/gpio/reset-thing/value