Re: [Linuxptp-users] Problems with hardware time stamping with PHY DP83640 on MCP5200 powerpc platform

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

On Wed, May 23, 2012 at 04:54:42PM +0200, Mario Molitor wrote:
> I have a question to phy driver dp83640.c only for interest. I have seen in
> probe function that recalibrate(clock) function not always executed directly
> after registration.  What is the reason for this?

The driver supports using multiple PHYs together as one PHC
clock. Calibration is needed to synchronize multiple PHYs, but only
when you have two or more PHYs on the same MDIO bus.
 
Do you have more than one PHY in your design?

If so, their GPIOs need to be wired together correctly in order to
make this work.

If not, then the recalibrate() function should never be called.

HTH,
Richard