I think I'm going to have to make a blog post addressing some of the clocking questions that come up. My brief answer for now is that there is only one clock, and that is the ETH-68 clock. The overall data flow is push based; the arrival of a new buffer of data at the Linux host IS the clocking event that schedules an audio graph evaluation. There is no need for another clock on the Linux host.
> There is no need for another clock on the Linux host
surely that works only as long as eth68 is the only interface? but often you might want other interfaces too which inherently have their own clocks