[PATCH] PHY: Add support for configuring the PHY connection interface

Most PHYs connect to an ethernet controller over a GMII or MII
interface.  However, a growing number are connected over
different interfaces, such as RGMII or SGMII.

The ethernet driver will tell the PHY what type of connection it
is by setting it manually, or passing it in through phy_connect
(or phy_attach).

Changes include:
* Updates to documentation
* Updates to PHY Lib consumers
* Changes to PHY Lib to add interface support
* Some minor changes to whitespace in phy.h
* gianfar driver now detects interface and passes appropriate
  value to PHY Lib
Signed-off-by: Andrew Fleming <afleming@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

Documentation/networking/phy.txt

@@ -1,7 +1,7 @@
 
 -------
 PHY Abstraction Layer
-(Updated 2005-07-21)
+(Updated 2006-11-30)
 
 Purpose
 
@@ -97,11 +97,12 @@ Letting the PHY Abstraction Layer do Everything
  
  Next, you need to know the device name of the PHY connected to this device. 
  The name will look something like, "phy0:0", where the first number is the
- bus id, and the second is the PHY's address on that bus.
+ bus id, and the second is the PHY's address on that bus.  Typically,
+ the bus is responsible for making its ID unique.
  
  Now, to connect, just call this function:
  
-   phydev = phy_connect(dev, phy_name, &adjust_link, flags);
+   phydev = phy_connect(dev, phy_name, &adjust_link, flags, interface);
 
  phydev is a pointer to the phy_device structure which represents the PHY.  If
  phy_connect is successful, it will return the pointer.  dev, here, is the
@@ -115,6 +116,10 @@ Letting the PHY Abstraction Layer do Everything
  This is useful if the system has put hardware restrictions on
  the PHY/controller, of which the PHY needs to be aware.
 
+ interface is a u32 which specifies the connection type used
+ between the controller and the PHY.  Examples are GMII, MII,
+ RGMII, and SGMII.  For a full list, see include/linux/phy.h
+
  Now just make sure that phydev->supported and phydev->advertising have any
  values pruned from them which don't make sense for your controller (a 10/100
  controller may be connected to a gigabit capable PHY, so you would need to
@@ -191,7 +196,7 @@ Doing it all yourself
    start, or disables then frees them for stop.
 
  struct phy_device * phy_attach(struct net_device *dev, const char *phy_id,
-		 u32 flags);
+		 u32 flags, phy_interface_t interface);
 
    Attaches a network device to a particular PHY, binding the PHY to a generic
    driver if none was found during bus initialization.  Passes in