dt-bindings: net: adin1110: Add docs

Add bindings for the ADIN1110/2111 MAC-PHY/SWITCH.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/Documentation/devicetree/bindings/net/adi,adin1110.yaml b/Documentation/devicetree/bindings/net/adi,adin1110.yaml
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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/adi,adin1110.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ADI ADIN1110 MAC-PHY
+
+maintainers:
+  - Alexandru Tachici <alexandru.tachici@analog.com>
+
+description: |
+  The ADIN1110 is a low power single port 10BASE-T1L MAC-
+  PHY designed for industrial Ethernet applications. It integrates
+  an Ethernet PHY core with a MAC and all the associated analog
+  circuitry, input and output clock buffering.
+
+  The ADIN2111 is a low power, low complexity, two-Ethernet ports
+  switch with integrated 10BASE-T1L PHYs and one serial peripheral
+  interface (SPI) port. The device is designed for industrial Ethernet
+  applications using low power constrained nodes and is compliant
+  with the IEEE 802.3cg-2019 Ethernet standard for long reach
+  10 Mbps single pair Ethernet (SPE).
+
+  The device has a 4-wire SPI interface for communication
+  between the MAC and host processor.
+
+allOf:
+  - $ref: ethernet-controller.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - adi,adin1110
+      - adi,adin2111
+
+  reg:
+    maxItems: 1
+
+  adi,spi-crc:
+    description: |
+      Enable CRC8 checks on SPI read/writes.
+    type: boolean
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi {
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ethernet@0 {
+            compatible = "adi,adin2111";
+            reg = <0>;
+            spi-max-frequency = <24500000>;
+
+            adi,spi-crc;
+
+            interrupt-parent = <&gpio>;
+            interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
+
+            local-mac-address = [ 00 11 22 33 44 55 ];
+        };
+    };