Document Motorcomm YT8824 PHY package.

Motorcomm YT8824 Ethernet PHY is PHY package of 4 PHY-s.

Document the required property to make the PHY package correctly
configure and work.

Signed-off-by: Kyle Switch <kyle.switch@motor-comm.com>
---
 .../bindings/net/motorcomm,yt8824.yaml        | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/motorcomm,yt8824.yaml

diff --git a/Documentation/devicetree/bindings/net/motorcomm,yt8824.yaml b/Documentation/devicetree/bindings/net/motorcomm,yt8824.yaml
new file mode 100644
index 000000000000..9907a4a7e63e
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/motorcomm,yt8824.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/motorcomm,yt8824.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MotorComm YT8824 Ethernet PHY
+
+maintainers:
+  - Kyle Switch <kyle.switch@motor-comm.com>
+
+description: |
+  Motorcomm YT8824 Ethernet PHY is a PHY package of 4 PHYs.
+
+$ref: ethernet-phy-package.yaml#
+
+properties:
+  compatible:
+    enum:
+      - ethernet-phy-id4f51.e8b8
+
+  motorcomm,interface-mode:
+    description: |
+      PHY package interface mode.
+    $ref: /schemas/types.yaml#/definitions/string
+    enum:
+      - internal
+      - usxgmii
+    default: internal
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ethernet-phy-package@0 {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            compatible = "ethernet-phy-id4f51.e8b8";
+            reg = <9>;
+
+            motorcomm,interface-mode = "usxgmii";
+
+            ethernet-phy@4 {
+                reg = <4>;
+            };
+
+            ethernet-phy@5 {
+                reg = <5>;
+            };
+
+            ethernet-phy@6 {
+                reg = <6>;
+            };
+
+            ethernet-phy@7 {
+                reg = <7>;
+            };
+        };
+    };
-- 
2.25.1