dt-bindings: net: Add Davicom dm9051 SPI ethernet controller

This is a new yaml base data file for configure davicom dm9051 with
device tree
Signed-off-by: Joseph CHAMG <josright123@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/davicom,dm9051.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/davicom,dm9051.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Davicom DM9051 SPI Ethernet Controller
+
+maintainers:
+  - Joseph CHANG <josright123@gmail.com>
+
+description: |
+  The DM9051 is a fully integrated and cost-effective low pin count single
+  chip Fast Ethernet controller with a Serial Peripheral Interface (SPI).
+
+allOf:
+  - $ref: ethernet-controller.yaml#
+
+properties:
+  compatible:
+    const: davicom,dm9051
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 45000000
+
+  interrupts:
+    maxItems: 1
+
+  local-mac-address: true
+
+  mac-address: true
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  # Raspberry Pi platform
+  - |
+    /* for Raspberry Pi with pin control stuff for GPIO irq */
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ethernet@0 {
+            compatible = "davicom,dm9051";
+            reg = <0>; /* spi chip select */
+            local-mac-address = [00 00 00 00 00 00];
+            interrupt-parent = <&gpio>;
+            interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
+            spi-max-frequency = <31200000>;
+        };
+    };