On Tue, Oct 13, 2015 at 09:51:02AM +0200, Thomas Gleixner wrote: > > You are restricting the problem space to this particular use > case. There are other use cases where PTP is not available or not the > relevant reference, but you still want to correlate time domains to > ART.
They may well be other use cases, but they have not been identified here. The PTP to media clock problem has a very simple solution. You do not need a history of system time stamps to solve it. Even if you wanted to correlate the system time's UTC with the media clock, still you don't need any shadow history for that. Just feed (ART, UTC) pairs into the DSP at a regular rate, and let the DSP do the math. This does not need to be part of the central time keeping code at all. Thanks, Richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
