> -----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
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