Re: [Linuxptp-devel] [RFC PATCH 01/15] posix_clock_open: derive PHC index from device name if possible
> -Original Message- > From: Richard Cochran > Sent: Wednesday, August 12, 2020 8:40 AM > To: Keller, Jacob E > Cc: linuxptp-devel@lists.sourceforge.net > Subject: Re: [Linuxptp-devel] [RFC PATCH 01/15] posix_clock_open: derive PHC > index from device name if possible > > On Wed, Aug 05, 2020 at 04:12:02PM -0700, Jacob Keller wrote: > > Here, we are making the implicit assumption that all ptp clock devices > > will always have /dev/ptpX format. I don't think anyone is crazy enough > > to rename these devices... > > (Not yet, anyways ;^) > > > An alternative (requiring kernel implementation maybe?) would be to read > > the phc index from the kernel somehow. It doesn't look like this is > > exported anywhere else besides the name. > > How about /sys/class/ptp/ptpX/clock_index ? > > Is that something you would like to code up for the lkml? > > Thanks, > Richard To make this fully work we'll probably want to adjust the LinuxPTP code base with a phc_index_to_dev function that scans the sys/class/ptp folder for the matching clock based on the index to obtain the name. I'll see about adding that as well (with a fallback to attempting /dev/ptpX if clock_index doesn't exist) Thanks, Jake ___ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
Re: [Linuxptp-devel] [RFC PATCH 01/15] posix_clock_open: derive PHC index from device name if possible
> -Original Message- > From: Richard Cochran > Sent: Wednesday, August 12, 2020 8:40 AM > To: Keller, Jacob E > Cc: linuxptp-devel@lists.sourceforge.net > Subject: Re: [Linuxptp-devel] [RFC PATCH 01/15] posix_clock_open: derive PHC > index from device name if possible > > On Wed, Aug 05, 2020 at 04:12:02PM -0700, Jacob Keller wrote: > > Here, we are making the implicit assumption that all ptp clock devices > > will always have /dev/ptpX format. I don't think anyone is crazy enough > > to rename these devices... > > (Not yet, anyways ;^) > > > An alternative (requiring kernel implementation maybe?) would be to read > > the phc index from the kernel somehow. It doesn't look like this is > > exported anywhere else besides the name. > > How about /sys/class/ptp/ptpX/clock_index ? > > Is that something you would like to code up for the lkml? > > Thanks, > Richard Yea, I can do that. -Jake ___ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
Re: [Linuxptp-devel] [RFC PATCH 01/15] posix_clock_open: derive PHC index from device name if possible
On Wed, Aug 05, 2020 at 04:12:02PM -0700, Jacob Keller wrote: > Here, we are making the implicit assumption that all ptp clock devices > will always have /dev/ptpX format. I don't think anyone is crazy enough > to rename these devices... (Not yet, anyways ;^) > An alternative (requiring kernel implementation maybe?) would be to read > the phc index from the kernel somehow. It doesn't look like this is > exported anywhere else besides the name. How about /sys/class/ptp/ptpX/clock_index ? Is that something you would like to code up for the lkml? Thanks, Richard ___ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
