dt-bindings: net: cdns,macb: add Mobileye EyeQ5 ethernet interface

Add "cdns,eyeq5-gem" as compatible for the integrated GEM block inside
Mobileye EyeQ5 SoCs. It is different from other compatibles in two main
ways: (1) it requires a generic PHY and (2) it is better to keep TCP
Segmentation Offload (TSO) disabled.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://patch.msgid.link/20251023-macb-eyeq5-v3-1-af509422c204@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/devicetree/bindings/net/cdns,macb.yaml

@@ -57,6 +57,7 @@ properties:
           - cdns,np4-macb             # NP4 SoC devices
           - microchip,sama7g5-emac    # Microchip SAMA7G5 ethernet interface
           - microchip,sama7g5-gem     # Microchip SAMA7G5 gigabit ethernet interface
+          - mobileye,eyeq5-gem        # Mobileye EyeQ5 SoCs
           - raspberrypi,rp1-gem       # Raspberry Pi RP1 gigabit ethernet interface
           - sifive,fu540-c000-gem     # SiFive FU540-C000 SoC
 
@@ -183,6 +184,15 @@ allOf:
         reg:
           maxItems: 1
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mobileye,eyeq5-gem
+    then:
+      required:
+        - phys
+
 unevaluatedProperties: false
 
 examples: