RFC: PHY Abstraction Layer II

[Andy Fleming]

I've finally gotten all of ebs's suggestions into the PHY code.  Here 
is the new version.  It has the following improvements:

* All PHYs now determine speed,duplex, etc using the same generic code, 
rather than PHY-specific registers.

* The genphy driver works for gigabit PHYs now, as well.  In theory, if 
your PHY isn't broken in some way (I've encountered a number that are), 
you should be able to just use genphy.

* The genphy driver now detects what features the PHY has, rather than 
relying on arbitrarily hard-coded values

* Pause negotiation and advertising has been added

* PHY read and write functions now return errors if the bus read/write 
functions return errors.  These errors are handled properly, and should 
not cause any problem.  It is the bus's responsibility, however, to 
make sure that the PHY is started again once the error is cleared.

This patch contains just the PHY code.  A later email will contain the 
gianfar driver and 85xx patches, which will serve as an example for how 
to use the PHY code.

A note about size:  I did some rough size comparisons, and it looks 
like this code adds ~10 K to the binary size of the kernel (for PPC 32, 
85xx).  However, that's a rough estimate, since my tree includes 
features added to the gianfar driver (eg: ethtool support for setting 
speed/duplex).


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Andy Fleming
Open Source Team
Freescale Semiconductor, Inc