On Wed, May 30, 2018 at 07:38:22AM -0700, Richard Cochran wrote: > On Wed, May 30, 2018 at 12:32:34PM +0200, Johan Hovold wrote: > > Another possible extension is to add generic 1PPS support. > > There are two possibilities to consider. > > 1. If the PPS causes an interrupt, then it should hook into the PPS > subsystem. Registering a PPS child device is what I had in mind for this. > 2. If the PPS is a HW signal routed for example to the input pin of a > MAC based PTP Hardware Clock (PHC), then it would make sense to > model the GNSS device as a PHC as well. This PHC would be readable > but not writable, and more importantly it would offer an output > signal. Then user space could use the existing interfaces to > dial the PPS signal from one device the another. Ok. > (Come to think of it, modeling the GNSS as PHC would also give you the > interface for #1 as well.) Thanks Johan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
