Add devicetree binding document for Loongson-1 DWMAC glue layer.

Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
---
 .../bindings/net/loongson,ls1x-dwmac.yaml     | 98 +++++++++++++++++++
 .../devicetree/bindings/net/snps,dwmac.yaml   |  2 +
 2 files changed, 100 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/loongson,ls1x-dwmac.yaml

diff --git a/Documentation/devicetree/bindings/net/loongson,ls1x-dwmac.yaml b/Documentation/devicetree/bindings/net/loongson,ls1x-dwmac.yaml
new file mode 100644
index 000000000000..150799460599
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/loongson,ls1x-dwmac.yaml

@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/loongson,ls1x-dwmac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-1 DWMAC glue layer
+
+maintainers:
+  - Keguang Zhang <keguang.zhang@gmail.com>
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - loongson,ls1b-dwmac
+          - loongson,ls1c-dwmac
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - loongson,ls1b-dwmac
+          - loongson,ls1c-dwmac
+      - const: snps,dwmac-3.50a
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: stmmaceth

+  - syscon
+
+allOf:
+  - $ref: snps,dwmac.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/loongson,ls1x-clk.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    gmac0: ethernet@1fe10000 {
+        compatible = "loongson,ls1b-dwmac", "snps,dwmac-3.50a";
+        reg = <0x1fe10000 0x10000>;
+
+        clocks = <&clkc LS1X_CLKID_AHB>;
+        clock-names = "stmmaceth";
+
+        interrupt-parent = <&intc1>;
+        interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "macirq";
+
+        phy-handle = <&phy0>;
+        phy-mode = "mii";
+
+        snps,pbl = <1>;
+        syscon = <&syscon>;
+
+        mdio {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            compatible = "snps,dwmac-mdio";
+
+            phy0: ethernet-phy@0 {
+                reg = <0x0>;
+            };
+        };
+    };

diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
index ddf9522a5dc2..e1a956cf171e 100644
--- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml

@@ -66,6 +66,8 @@ properties:
         - ingenic,x2000-mac
         - loongson,ls2k-dwmac
         - loongson,ls7a-dwmac
+        - loongson,ls1b-dwmac
+        - loongson,ls1c-dwmac