On Mon, Aug 22, 2016 at 11:34 AM, Richard Cochran <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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