On 12/08/2020 23:40, Keller, Jacob E wrote: >> -----Original Message----- >> From: Richard Cochran <richardcoch...@gmail.com> >> Sent: Wednesday, August 12, 2020 8:40 AM >> To: Keller, Jacob E <jacob.e.kel...@intel.com> >> 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 >
Most linux system have /sys mounted "sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)" But I guess it is not mandatory. I think fallback is needed. Erez _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
