phy dp83867: Make rgmii parameters optional
If you compile without OF_MDIO support in an RGMII configuration, we fail to configure the dp83867 phy today by writing garbage into its configuration registers. On the other hand if you do compile with OF_MDIO and the phy gets loaded via device tree, you have to have the properties set in the device tree, otherwise we fail to load the driver and don't even attach the generic phy driver to the interface anymore. To make things slightly more consistent, make the rgmii configuration properties optional and allow a user to omit them in their device tree. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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