On Tue, Jun 15, 2021 at 05:45:09PM +0800, Yangbo Lu wrote: > diff --git a/Documentation/ABI/testing/sysfs-ptp b/Documentation/ABI/testing/sysfs-ptp > index 2363ad810ddb..2ef11b775f47 100644 > --- a/Documentation/ABI/testing/sysfs-ptp > +++ b/Documentation/ABI/testing/sysfs-ptp > @@ -61,6 +61,19 @@ Description: > This file contains the number of programmable pins > offered by the PTP hardware clock. > > +What: /sys/class/ptp/ptpN/n_vclocks > +Date: May 2021 > +Contact: Yangbo Lu <yangbo.lu@xxxxxxx> > +Description: > + This file contains the ptp virtual clocks number in use, > + based on current ptp physical clock. In default, the > + value is 0 meaning only ptp physical clock is in use. > + Setting the value can create corresponding number of ptp > + virtual clocks to use. But current ptp physical clock is > + guaranteed to stay free running. Setting the value back > + to 0 can delete ptp virtual clocks and back use ptp > + physical clock again. The native speaker in me suggests: This file contains the number of virtual PTP clocks in use. By default, the value is 0 meaning that only the physical clock is in use. Setting the value creates the corresponding number of virtual clocks and causes the physical clock to become free running. Setting the value back to 0 deletes the virtual clocks and switches the physical clock back to normal, adjustable operation. Thanks, Richard
