dt-bindings: net: convert emac_rockchip.txt to YAML

Convert emac_rockchip.txt to YAML.

Changes against original bindings:
  Add mdio sub node.
  Add extra clock for rk3036

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220603163539.537-1-jbx6244@gmail.com

Author: Johan Jonker

Documentation/devicetree/bindings/net/emac_rockchip.txt

@@ -0,0 +1,115 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/rockchip,emac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip RK3036/RK3066/RK3188 Ethernet Media Access Controller (EMAC)
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+
+properties:
+  compatible:
+    enum:
+      - rockchip,rk3036-emac
+      - rockchip,rk3066-emac
+      - rockchip,rk3188-emac
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    items:
+      - description: host clock
+      - description: reference clock
+      - description: mac TX/RX clock
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: hclk
+      - const: macref
+      - const: macclk
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon GRF used to control speed and mode for the EMAC.
+
+  phy-supply:
+    description:
+      Phandle to a regulator if the PHY needs one.
+
+  mdio:
+    $ref: mdio.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - rockchip,grf
+  - phy
+  - phy-mode
+  - mdio
+
+allOf:
+  - $ref: "ethernet-controller.yaml#"
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: rockchip,rk3036-emac
+
+    then:
+      properties:
+        clocks:
+          minItems: 3
+
+        clock-names:
+          minItems: 3
+
+    else:
+      properties:
+        clocks:
+          maxItems: 2
+
+        clock-names:
+          maxItems: 2
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/rk3188-cru-common.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    ethernet@10204000 {
+      compatible = "rockchip,rk3188-emac";
+      reg = <0xc0fc2000 0x3c>;
+      interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&cru HCLK_EMAC>, <&cru SCLK_MAC>;
+      clock-names = "hclk", "macref";
+      rockchip,grf = <&grf>;
+      pinctrl-0 = <&emac_xfer>, <&emac_mdio>, <&phy_int>;
+      pinctrl-names = "default";
+      phy = <&phy0>;
+      phy-mode = "rmii";
+      phy-supply = <&vcc_rmii>;
+
+      mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        phy0: ethernet-phy@0 {
+          reg = <1>;
+        };
+      };
+    };