Adding GPIO/SPI/I2C functionality to FTDI driver

[Philipp Hachtmann]

> Stefan and Philipp, has any of your patch sets received updates in the
> meantime that have not been sent to the mailing list?
No, sorry. They did not even want to have my syncmode patch. For me the biggest 
problem is that the ftdi_sio driver is buried in that generic tty/usb-tty stuff 
which I don't have fully understood yet (and not found the time to really 
investigate)

Kind regards

Philipp