[PATCH v6 2/3] netdev/of/phy: Add MDIO bus multiplexer support.

[David Miller]

From: David Daney <ddaney.cavm at gmail.com>
Date: Wed,  2 May 2012 18:16:38 -0700

> From: David Daney <david.daney at cavium.com>
> 
> This patch adds a somewhat generic framework for MDIO bus
> multiplexers.  It is modeled on the I2C multiplexer.
> 
> The multiplexer is needed if there are multiple PHYs with the same
> address connected to the same MDIO bus adepter, or if there is
> insufficient electrical drive capability for all the connected PHY
> devices.
> 
> Conceptually it could look something like this:
 ...
> This framework configures the bus topology from device tree data.  The
> mechanics of switching the multiplexer is left to device specific
> drivers.
> 
> The follow-on patch contains a multiplexer driven by GPIO lines.
> 
> Signed-off-by: David Daney <david.daney at cavium.com>

Applied.