SQL Server 2014 and CAU

Hi,

I know that CAU with SQL Server 2012 Availability Groups was unsupported, but has this changed for SQL 2014?

We tried it out and the failover to the second node worked fine, but it failed to move back to the primary after the patching was completed.

Is it now supported and we're doing it wrong or still not supported? If not supported, what is the supported method of patching the servers in the cluster?

Thanks

Gary