device tree binding documentation outdated

[Shawn Guo]

On Sun, Sep 29, 2013 at 06:23:39AM +0000, Duan Fugang-B38611 wrote:
> Shawn, for RGMII mode, RGMII tx_clk cannot get external clock via GPIO_16, only by ENET_REF_CLK PAD.
> 	 For RMII mode, enet refrenece clock can get external clock via GPIO_16 and RGMII_TX_CTL PADs.

Yes, that's my understanding too.  Please review the following message
to see if everything stands correct there.

http://thread.gmane.org/gmane.linux.drivers.devicetree/46115/focus=269646

Shawn