Document Microchip LAN969x MIIM compatible.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
---
Changes in v3:
* Pick Acked-by from Conor

 Documentation/devicetree/bindings/net/mscc,miim.yaml | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/mscc,miim.yaml b/Documentation/devicetree/bindings/net/mscc,miim.yaml
index 792f26b06b06..2207b33aee76 100644
--- a/Documentation/devicetree/bindings/net/mscc,miim.yaml
+++ b/Documentation/devicetree/bindings/net/mscc,miim.yaml
@@ -14,9 +14,14 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - mscc,ocelot-miim
-      - microchip,lan966x-miim
+    oneOf:
+      - enum:
+          - mscc,ocelot-miim
+          - microchip,lan966x-miim
+      - items:
+          - enum:
+              - microchip,lan9691-miim
+          - const: mscc,ocelot-miim
 
   "#address-cells":
     const: 1
-- 
2.52.0