dt-bindings: net: ethernet-controller: Document support for LEDs node

Document support for LEDs node in ethernet-controller.
Ethernet Controller may support different LEDs that can be configured
for different operation like blinking on traffic event or port link.

Also add some Documentation to describe the difference of these nodes
compared to PHY LEDs, since ethernet-controller LEDs are controllable
by the ethernet controller regs and the possible intergated PHY doesn't
have control on them.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/ethernet-controller.yaml

@@ -222,6 +222,41 @@ properties:
         required:
           - speed
 
+  leds:
+    description:
+      Describes the LEDs associated by Ethernet Controller.
+      These LEDs are not integrated in the PHY and PHY doesn't have any
+      control on them. Ethernet Controller regs are used to control
+      these defined LEDs.
+
+    type: object
+
+    properties:
+      '#address-cells':
+        const: 1
+
+      '#size-cells':
+        const: 0
+
+    patternProperties:
+      '^led@[a-f0-9]+$':
+        $ref: /schemas/leds/common.yaml#
+
+        properties:
+          reg:
+            maxItems: 1
+            description:
+              This define the LED index in the PHY or the MAC. It's really
+              driver dependent and required for ports that define multiple
+              LED for the same port.
+
+        required:
+          - reg
+
+        unevaluatedProperties: false
+
+    additionalProperties: false
+
 dependencies:
   pcs-handle-names: [pcs-handle]