Add support to specify the reference clock for the phy.

Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
Reviewed-by: Florian Fainelli <f.faine...@gmail.com>
---
v3:
- Add Florian's tag

v2:
- no change

 Documentation/devicetree/bindings/net/smsc-lan87xx.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/smsc-lan87xx.txt 
b/Documentation/devicetree/bindings/net/smsc-lan87xx.txt
index 8b7c719b0bb9..a8d0dc9a8c0e 100644
--- a/Documentation/devicetree/bindings/net/smsc-lan87xx.txt
+++ b/Documentation/devicetree/bindings/net/smsc-lan87xx.txt
@@ -5,6 +5,10 @@ through an Ethernet OF device node.
 
 Optional properties:
 
+- clocks:
+  The clock used as phy reference clock and is connected to phy
+  pin XTAL1/CLKIN.
+
 - smsc,disable-energy-detect:
   If set, do not enable energy detect mode for the SMSC phy.
   default: enable energy detect mode
-- 
2.20.1

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