On Sat, Mar 20, 2021 at 01:44:20PM +0100, Arnd Bergmann wrote: > Adding Richard Cochran as well, for drivers/ptp/, he may be able to > identify whether this should be integrated into that framework in some > form. I'm not familiar with the GTE, but it sounds like it is a (free running?) clock with time stamping inputs. If so, then it could expose a PHC. That gets you functionality: - clock_gettime() and friends - comparison ioctl between GTE clock and CLOCK_REALTIME - time stamping channels with programmable input selection The mentioned applications (robotics and autonomous vehicle, so near and dear to my heart) surely already use the PHC API for dealing with network and system time sources, and so exposing the GTE as a PHC means that user space programs will have a consistent API. [ The only drawback I can see is the naming of the C language identifiers in include/uapi/linux/ptp_clock.h. If that bothers people, then these can be changed to something more generic while keeping compatibility aliases. ] Thanks, Richard
