I try to control a few gpio pins via bash script. Board and OS version is: cat /proc/device-tree/compatible olimex,a13-olinuxinoallwinner,sun5i-a13 cat /etc/os-release NAME="openSUSE Leap" VERSION="42.3" ID=opensuse ID_LIKE="suse" VERSION_ID="42.3" PRETTY_NAME="openSUSE Leap 42.3" ANSI_COLOR="0;32" CPE_NAME="cpe:/o:opensuse:leap:42.3" BUG_REPORT_URL="https://bugs.opensuse.org" HOME_URL="https://www.opensuse.org/" In /sys/class/gpio I do: echo 3 > export ls export gpio3 gpiochip0 unexport ls gpio3/ active_low device/ direction power/ subsystem/ uevent value cat gpio3/direction in So when I want to change the pin direction: echo out > gpio3/direction bash: echo: write error: Unknown error 517 That is EPROBE_DEFER. The kernel signals that the requested device might be probed later, ...or never. I guess that there might be some device tree item missing, but from the kernel documentation I haven't found a solution for that. Does anybody have an idea how to get that working? Br, Frank -- To unsubscribe, e-mail: opensuse-arm+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-arm+owner@opensuse.org