The Ethernet MACs on SpacemiT K1 appears to be a custom design. SpacemiT
refers to them as "EMAC", so let's just call them "spacemit,k1-emac".

Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
 .../devicetree/bindings/net/spacemit,k1-emac.yaml  | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/spacemit,k1-emac.yaml b/Documentation/devicetree/bindings/net/spacemit,k1-emac.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..500a3e1daa230ea3a1fad30d8ea56a7822fccb3d
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/spacemit,k1-emac.yaml
@@ -0,0 +1,81 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/spacemit,k1-emac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 Ethernet MAC
+
+allOf:
+  - $ref: ethernet-controller.yaml#
+
+maintainers:
+  - Vivian Wang <wangruikang@iscas.ac.cn>
+
+properties:
+  compatible:
+    const: spacemit,k1-emac
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  mdio-bus:
+    $ref: mdio.yaml#
+    unevaluatedProperties: false
+
+  resets:
+    maxItems: 1
+
+  spacemit,apmu:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to syscon that controls this MAC
+          - description: offset of control registers
+    description:
+      A phandle to syscon with byte offset to control registers for this MAC
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+  - resets
+  - spacemit,apmu
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/spacemit,k1-syscon.h>
+
+    ethernet@cac80000 {
+        compatible = "spacemit,k1-emac";
+        reg = <0xcac80000 0x00000420>;
+        clocks = <&syscon_apmu CLK_EMAC0_BUS>;
+        interrupts = <131>;
+        mac-address = [ 00 00 00 00 00 00 ];
+        phy-handle = <&rgmii0>;
+        phy-mode = "rgmii-id";
+        pinctrl-names = "default";
+        pinctrl-0 = <&gmac0_cfg>;
+        resets = <&syscon_apmu RESET_EMAC0>;
+        rx-internal-delay-ps = <0>;
+        tx-internal-delay-ps = <0>;
+        spacemit,apmu = <&syscon_apmu 0x3e4>;
+
+        mdio-bus {
+            #address-cells = <0x1>;
+            #size-cells = <0x0>;
+
+            rgmii0: phy@1 {
+                reg = <0x1>;
+            };
+        };
+    };

-- 
2.49.0