Thanks Richard and Dale for the fast replies. I see that it should be possible to use the ptp_feature_enable function to pass in an alarm time, and then when the alarm fires, use the EXTTS event mechanism to pass a notification/event back to the app. Hopefully this will suffice for our application.
Thanks, Kieran. > On 22 Aug 2016, at 17:39, Dale Smith <dalepsm...@gmail.com> wrote: > > > On Mon, Aug 22, 2016 at 11:34 AM, Richard Cochran <richardcoch...@gmail.com > <mailto:richardcoch...@gmail.com>> wrote: > > So my questions: > > - is the one-shot alarm functionality of the PHC actually implemented in > > any driver? > > No. > > > - how can I implement this in the freescale FEC driver without > > having to modify the kernel? (ptp_clock_kernel.h and > > drivers/ptp/ptp_clock.c) > > You can't implement this without changing the kernel. > > There are (currently) unused flag bits and the structures are padded out with > extra reserved fields. It's possible to abuse these fields to implement > whatever you need. You still need to modify the FEC (or whatever) driver, > but at least you don't need to plumb the changes all throughout the whole > kernel. > > I'm not really recommending you do this, especially if this is for general > purpose use. But if you really need to have a HW alarm go off with ns > resolution, this is one way to make it happen. (Yes, I needed to to exactly > that) > > Richard, thanks for having the forethought to add those extra fields! > > -Dale >
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