> Am 30.12.2017 um 23:26 schrieb Frank Kunz <[email protected]>: > > 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?
Usually changing gpio direction is the responsibility of the pinmux driver. Can you check if you have one loaded? Alex -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
