Re: GTE - The hardware timestamping engine

Richard Cochran
2021-03-23T12:52:25Z

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