Support for CP2105

Hi, 

I wanted to ask if there are any plans or ongoing work in supporting
Silicon Labs CP2105 in linux kernel.

I tried to add an entry in the source file and got two serial devices
in /dev/. The first one works flawlessly, the second does not.
Is there anything else I need to adapt?

I would be very happy to help to get this one supported (or even do on
my own if its not too difficult)

Thanks in advance,

Andreas