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

[Ledda W. E. <Wil...@it...>]

Sorry Richard, but I'm stiil a bit confused about the meaning of the PHY column. Let me make an example, I have a i350 that has the igb driver. I read from the table the following table:

Driver	Hardware	                SOTS	PHC	PHY	VER
igb	Intel 82576, 82580	RAW	Y	NA	3.5

In this case, this means that I have a PTP-capable PHY attached to PTP-capable MAC?

Thanks

-----Original Message-----
From: Richard Cochran [mailto:ric...@gm...] 
Sent: 31 July 2013 16:43
To: Ledda William EXT
Cc: lin...@li...
Subject: Re: [Linuxptp-users] Clarification about Driver Compatibility Matrix

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