Some form of --cap-add or optional elevated privilege system would be required for accessing GPIO pins on ARM devices. Since ARM is becoming better supported by the Docker engine I would like to raise this to attention.

We tend to need to write to /dev/mem and there is currently a capability for that in "regular flavoured swarm".

I would like to build out some IoT PoCs with Docker and swarmmode and support for this would really help. CC/ @DieterReuter @StefanScherer