[linux-cirrus] Re: Power down Ethernet Phy.

  
> Powering down the PHY is a board-dependent thing.  (For 
> example, on the TS72xx, the PHY is powered up via a GPIO line.)
> 
> So, you'd have to check the docs that came with your board to 
> see how to do it.
> 

Yes, some of the PHY chip has power down pins, the one I have, ICS1893AF, does 
not.  But it has a software control bit that supposedly can be used to power 
down the chip.  Looking at the data sheet of CS8952 that was used in the Cirrus 
Logic EDB design, it has a power down pin and also the same control bit that 
can be used by software to power it down.  The fact the chips uses the same 
control bit ( the KS8721 uses the same bit too) as power down led me to think 
that the bit might be a "standard" configuration for all the PHY, of course I 
could be very wrong.  So I was looking for a "standard" method to power the PHY 
down.  Looking at the Cirrus Logic patch for the Ethernet driver, the power 
down code just simply call the reset function which is not a real power down.

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