Document the existence of the optional binding, directing to the
general ethernet document that describes this binding.

Signed-off-by: Brad Mouring <brad.mour...@ni.com>
Reviewed-by: Florian Fainelli <f.faine...@gmail.com>
---
 Documentation/devicetree/bindings/net/macb.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/net/macb.txt 
b/Documentation/devicetree/bindings/net/macb.txt
index 27966ae741e0..457d5ae16f23 100644
--- a/Documentation/devicetree/bindings/net/macb.txt
+++ b/Documentation/devicetree/bindings/net/macb.txt
@@ -29,6 +29,7 @@ Optional properties for PHY child node:
 - reset-gpios : Should specify the gpio for phy reset
 - magic-packet : If present, indicates that the hardware supports waking
   up via magic packet.
+- phy-handle : see ethernet.txt file in the same directory
 
 Examples:
 
-- 
2.16.2

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