>Yo Achim! > >On Tue, 28 Aug 2018 19:28:32 +0200 >Achim Gratz via devel <devel at ntpsec.org> wrote: > >> Gary E. Miller via devel writes: >> > We probably need to work with linuxpps, but we may have an easier >> > time working with the folks that maintain the Raspberry Pi fork. >> > The last time I asked for a dtb change it took one day to get in >> > git head. >> >> The only thing that linuxpps would be the correct target for is >> getting the PPS echo facility to do something useful with GPIO (and >> maybe serial, but that's a whole 'nother driver to consider). > >Yes. But until we have a kernel driver, the rest is pointless. > >> > Lukas told me, privately, he had already submitted it the the >> > LKM folks and been overwhelmed by the changes they requested. So >> > the patch will clearly need work. >> >> That does not surprise me, given it's all a pretty ugly hack that >> really only works for the one single thing he's needed it for. I'm >> not blaming him, just a reminder that getting things upstream takes a >> lot more apple polishing. > >Agreed. Lukas made a good start, but more to do. > >RGDS >GARY
I added PPS output to the linuxpps parallel port module a while back. I intend to use it to trigger the timemark input on the Trimble Palisade/Acutime with more accuracy than can be done in user space with the current driver. I ran out of free time, though, so I have been unable to proceed. I also added a polled mode to work around interrupt latency, along with a low-latency echo output. It can be found at https://github.com/retroman/pps_parport_polled _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel
