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Re: [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource

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On Fri, Sep 04, 2015 at 03:02:19PM +0200, Thomas Gleixner wrote:
> No. This function is explicitely for the precise timestamp usecase,
> which is required by PTP and other sane use cases.

Right.  The audio department only needs to know the (ART, ptp) offset.
The kernel and user space never need the (ART, mediaclock) offset.
That is private information for the DSP.

As long as user space reads (ART, ptp) and provides this regulary to
the audio DSP, then the DSP will have all the information it needs to
figure out (ptp, mediaclock).

Thanks,
Richard


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[PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource "Christopher S. Hall" <christopher.s.hall@intel.com> - 2015-08-22 04:00 +0200
  Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-08-22 22:20 +0200
    RE: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource "Hall, Christopher S" <christopher.s.hall@intel.com> - 2015-09-04 01:30 +0200
      Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Richard Cochran <richardcochran@gmail.com> - 2015-09-04 10:20 +0200
        Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Peter Zijlstra <peterz@infradead.org> - 2015-09-04 16:30 +0200
          RE: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource "Hall, Christopher S" <christopher.s.hall@intel.com> - 2015-09-04 23:20 +0200
      RE: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-09-04 15:10 +0200
        Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Peter Zijlstra <peterz@infradead.org> - 2015-09-04 17:20 +0200
          Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Richard Cochran <richardcochran@gmail.com> - 2015-09-04 17:20 +0200
            Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Peter Zijlstra <peterz@infradead.org> - 2015-09-04 17:50 +0200
              Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-09-04 18:40 +0200
                RE: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource "Hall, Christopher S" <christopher.s.hall@intel.com> - 2015-09-04 23:10 +0200
                RE: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-09-05 10:50 +0200
                Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Ingo Molnar <mingo@kernel.org> - 2015-09-05 12:10 +0200
        Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource Richard Cochran <richardcochran@gmail.com> - 2015-09-04 17:40 +0200
      Re: [PATCH v3 1/4] Add correlated clocksource deriving system time  from an auxiliary clocksource John Stultz <john.stultz@linaro.org> - 2015-09-05 00:00 +0200

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