On Mon, Apr 20, 2020 at 07:58:53AM +0000, Christian Leeb wrote: > - I'd rather claim that typically all clocks of a SoC are derived from > a single crystal oscillator. For our TI Sitara based HW this is certainly the > case.
I can only say, well done! However, most ARM boards I've seen aren't this careful. The MAC is not always part of the SoC. Also, there is no guarantee that a MAC on a SoC is in the same clock domain as the rest. I won't even mention PC systems. But my point was not to claim the MAC clocks are generally worse than system clocks. Rather, there must be some sort of default behavior, and the choice of that default is arbitrary. There is no clear "best" alternative here. > - with -r / -rr it can be already controlled if system clock is a > possible sync dest/source. > 2) If the system clock is eligible a sync destination I would claim that it > should also get synced if there is no source. This would be consistent as > also all PHCs are kept in sync. The default behavior is what it is, and it will stay that way simply because changing it willy-nilly is user unfriendly. The real problem is the lack of any means for users to configure the desired behavior. Patches are always welcome... Thanks, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
