[PATCH v3 net-next 3/3] dt-bindings: describe the support of "clock-frequency" in mdio

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mdio bus frequency can be configured at boottime by a property in DT
now, so add a description to it.

Signed-off-by: Andy Chiu <andy.chiu@xxxxxxxxxx>
Reviewed-by: Greentime Hu <greentime.hu@xxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/net/xilinx_axienet.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/xilinx_axienet.txt b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
index 1aa4c6006cd0..80e505a2fda1 100644
--- a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
+++ b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
@@ -68,6 +68,8 @@ Optional properties:
  - mdio		: Child node for MDIO bus. Must be defined if PHY access is
 		  required through the core's MDIO interface (i.e. always,
 		  unless the PHY is accessed through a different bus).
+		  Non-standard MDIO bus frequency is supported via
+		  "clock-frequency", see mdio.yaml.
 
  - pcs-handle: 	  Phandle to the internal PCS/PMA PHY in SGMII or 1000Base-X
 		  modes, where "pcs-handle" should be used to point
-- 
2.36.0




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