Re: [Linuxptp-users] Strange behaviour on AM5728 board

[Richard C. <ric...@gm...>]

On Thu, Apr 06, 2017 at 01:45:19PM +0200, Axel Holzinger wrote:
> To me it looks like there is trouble correctly adjusting the frequency of
> the PHC, it's always remaining +1000000, but also delays are ridicously high
> and negative (that doesn't make sense, does it?).

Does that SoC use the CPTS?  Probably the input clock is wrong.  Check
the data sheet and the device tree values for:

	cpts_clock_mult = <0x80000000>;
	cpts_clock_shift = <29>;

Thanks,
Richard