Finally the implementation suggested by Luke has been added! (see bug #762 c#18) https://git.libre-soc.org/?p=pinmux.git;a=commitdiff;h=56bf88cdb4ef409ec2d7bfb7621797ddce50857c Now need to adjust the driver functions to work with the "sel" signal. Some signal naming clean-up is probably a good idea too. Andrey