On Thu, Mar 19, 2015 at 01:48:08PM -0400, Greg Knight wrote:

Is there a straightforward way we could enable the clock on-demand - when we're communicating with the codec/mixer or actually using the audio subsystem - while keeping it disabled when not in use? We don't expect to be using the audio subsystem frequently.

This is what the clock API is there for - the driver can enable the clock whenver it needs it and disable it when it doesn't.