dt-bindings: net: Add support StarFive dwmac

Add documentation to describe StarFive dwmac driver(GMAC).
Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/devicetree/bindings/net/snps,dwmac.yaml

@@ -94,6 +94,7 @@ properties:
         - snps,dwmac-5.20
         - snps,dwxgmac
         - snps,dwxgmac-2.10
+        - starfive,jh7110-dwmac
 
   reg:
     minItems: 1

Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2022 StarFive Technology Co., Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/starfive,jh7110-dwmac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7110 DWMAC glue layer
+
+maintainers:
+  - Emil Renner Berthing <kernel@esmil.dk>
+  - Samin Guo <samin.guo@starfivetech.com>
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - starfive,jh7110-dwmac
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - starfive,jh7110-dwmac
+      - const: snps,dwmac-5.20
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: GMAC main clock
+      - description: GMAC AHB clock
+      - description: PTP clock
+      - description: TX clock
+      - description: GTX clock
+
+  clock-names:
+    items:
+      - const: stmmaceth
+      - const: pclk
+      - const: ptp_ref
+      - const: tx
+      - const: gtx
+
+  interrupts:
+    minItems: 3
+    maxItems: 3
+
+  interrupt-names:
+    minItems: 3
+    maxItems: 3
+
+  resets:
+    items:
+      - description: MAC Reset signal.
+      - description: AHB Reset signal.
+
+  reset-names:
+    items:
+      - const: stmmaceth
+      - const: ahb
+
+  starfive,tx-use-rgmii-clk:
+    description:
+      Tx clock is provided by external rgmii clock.
+    type: boolean
+
+  starfive,syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to syscon that configures phy mode
+          - description: Offset of phy mode selection
+          - description: Shift of phy mode selection
+    description:
+      A phandle to syscon with two arguments that configure phy mode.
+      The argument one is the offset of phy mode selection, the
+      argument two is the shift of phy mode selection.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - interrupt-names
+  - resets
+  - reset-names
+
+allOf:
+  - $ref: snps,dwmac.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    ethernet@16030000 {
+        compatible = "starfive,jh7110-dwmac", "snps,dwmac-5.20";
+        reg = <0x16030000 0x10000>;
+        clocks = <&clk 3>, <&clk 2>, <&clk 109>,
+                 <&clk 6>, <&clk 111>;
+        clock-names = "stmmaceth", "pclk", "ptp_ref",
+                      "tx", "gtx";
+        resets = <&rst 1>, <&rst 2>;
+        reset-names = "stmmaceth", "ahb";
+        interrupts = <7>, <6>, <5>;
+        interrupt-names = "macirq", "eth_wake_irq", "eth_lpi";
+        phy-mode = "rgmii-id";
+        snps,multicast-filter-bins = <64>;
+        snps,perfect-filter-entries = <8>;
+        rx-fifo-depth = <2048>;
+        tx-fifo-depth = <2048>;
+        snps,fixed-burst;
+        snps,no-pbl-x8;
+        snps,tso;
+        snps,force_thresh_dma_mode;
+        snps,axi-config = <&stmmac_axi_setup>;
+        snps,en-tx-lpi-clockgating;
+        snps,txpbl = <16>;
+        snps,rxpbl = <16>;
+        starfive,syscon = <&aon_syscon 0xc 0x12>;
+        phy-handle = <&phy0>;
+
+        mdio {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            compatible = "snps,dwmac-mdio";
+
+            phy0: ethernet-phy@0 {
+                reg = <0>;
+            };
+        };
+
+        stmmac_axi_setup: stmmac-axi-config {
+            snps,lpi_en;
+            snps,wr_osr_lmt = <4>;
+            snps,rd_osr_lmt = <4>;
+            snps,blen = <256 128 64 32 0 0 0>;
+        };
+    };

MAINTAINERS

@@ -19928,6 +19928,12 @@ M:	Emil Renner Berthing <kernel@esmil.dk>
 S:	Maintained
 F:	arch/riscv/boot/dts/starfive/
 
+STARFIVE DWMAC GLUE LAYER
+M:	Emil Renner Berthing <kernel@esmil.dk>
+M:	Samin Guo <samin.guo@starfivetech.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
+
 STARFIVE JH7100 CLOCK DRIVERS
 M:	Emil Renner Berthing <kernel@esmil.dk>
 S:	Maintained