On Tue, Mar 23, 2021 at 10:03:18AM +0100, Thierry Reding wrote:

I agree. My understanding is the the TSC is basically an SoC-wide clock
that can be (and is) used by several hardware blocks. There's an
interface for software to read out the value, but it's part of a block
called TKE (time-keeping engine, if I recall correctly) that implements
various clock sources and watchdog functionality.

...

Anyway, I think given that the GTE doesn't provide that clock itself but
rather just a means of taking a snapshot of that clock and stamping
certain events with that, it makes more sense to provide that clock from
the TKE driver.

It sounds like TKE + GTE together act like a PHC, and GTE doesn't
need/want its own SW interface.

Thanks,
Richard