Re: [Linuxptp-users] Clarification about Driver Compatibility Matrix

[Richard C. <ric...@gm...>]

On Wed, Jul 31, 2013 at 09:18:48AM +0000, Ledda William EXT wrote:
> Hi all,
> I don't understand very well why in the Compatibility matrix all Hardware timestamping drivers have the PHY column to "NA", while in the software timestamping table some have the PHY equal to "Y" and some equal to "N".
> 
> My interpretation is that, since they have the PHC support this means that they also support the timestamping in PHY. Is it the right conclusion?

No, time stamping can be done in hardware in special MACs and special
PHYs. The Linux kernel does not support both at the same time, so if
you have a PTP-capable PHY attached to PTP-capable MAC, then you will
only get the MAC as a PHC.

In addition, only drivers using phylib can support PTP-capable PHYs.

HTH,
Richard