Hello, ownership/permissions on gpio device are like tis: crw-------. 1 root root 254, 0 Jan 1 1970 gpiochip0 crw-------. 1 root root 254, 1 Jan 1 1970 gpiochip1 crw-------. 1 root root 254, 2 Jan 1 1970 gpiochip2 crw-------. 1 root root 246, 0 Jan 1 1970 gpiomem while other device like ttys, are owned by root and "group owned" by tty, similar for video, disk, dialout etc. wouldn't it be 'better' to have these gpio devices owned by root, "group owned" by a group other then root (gpio)? (or did 'we' inherit that from further up/down the development chain?) Ron