net: dsa: microchip: Document property to disable reference clock

Document the new microchip,synclko-disable property which can be
specified to disable the reference clock output from the device if not
required by the board design.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml

@@ -42,6 +42,12 @@ properties:
     description:
       Set if the output SYNCLKO frequency should be set to 125MHz instead of 25MHz.
 
+  microchip,synclko-disable:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Set if the output SYNCLKO clock should be disabled. Do not mix with
+      microchip,synclko-125.
+
 required:
   - compatible
   - reg