dt-bindings: net: renesas,ethertsn: Add Ethernet TSN

Add bindings for Renesas R-Car Ethernet TSN End-station IP. The RTSN
device provides Ethernet network.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231121183738.656192-1-niklas.soderlund+renesas@ragnatech.seSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/devicetree/bindings/net/renesas,ethertsn.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/renesas,ethertsn.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Ethernet TSN End-station
+
+maintainers:
+  - Niklas Söderlund <niklas.soderlund@ragnatech.se>
+
+description:
+  The RTSN device provides Ethernet network using a 10 Mbps, 100 Mbps, or 1
+  Gbps full-duplex link via MII/GMII/RMII/RGMII. Depending on the connected PHY.
+
+allOf:
+  - $ref: ethernet-controller.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r8a779g0-ethertsn       # R-Car V4H
+      - const: renesas,rcar-gen4-ethertsn
+
+  reg:
+    items:
+      - description: TSN End Station target
+      - description: generalized Precision Time Protocol target
+
+  reg-names:
+    items:
+      - const: tsnes
+      - const: gptp
+
+  interrupts:
+    items:
+      - description: TX data interrupt
+      - description: RX data interrupt
+
+  interrupt-names:
+    items:
+      - const: tx
+      - const: rx
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  phy-mode:
+    contains:
+      enum:
+        - mii
+        - rgmii
+
+  phy-handle:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Specifies a reference to a node representing a PHY device.
+
+  rx-internal-delay-ps:
+    enum: [0, 1800]
+
+  tx-internal-delay-ps:
+    enum: [0, 2000]
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+patternProperties:
+  "^ethernet-phy@[0-9a-f]$":
+    type: object
+    $ref: ethernet-phy.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-names
+  - clocks
+  - power-domains
+  - resets
+  - phy-mode
+  - phy-handle
+  - '#address-cells'
+  - '#size-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a779g0-cpg-mssr.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/r8a779g0-sysc.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    tsn0: ethernet@e6460000 {
+        compatible = "renesas,r8a779g0-ethertsn", "renesas,rcar-gen4-ethertsn";
+        reg = <0xe6460000 0x7000>,
+              <0xe6449000 0x500>;
+        reg-names = "tsnes", "gptp";
+        interrupts = <GIC_SPI 429 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 430 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "tx", "rx";
+        clocks = <&cpg CPG_MOD 2723>;
+        power-domains = <&sysc R8A779G0_PD_ALWAYS_ON>;
+        resets = <&cpg 2723>;
+
+        phy-mode = "rgmii";
+        tx-internal-delay-ps = <2000>;
+        phy-handle = <&phy3>;
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        phy3: ethernet-phy@3 {
+            compatible = "ethernet-phy-ieee802.3-c45";
+            reg = <0>;
+            interrupt-parent = <&gpio4>;
+            interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+            reset-gpios = <&gpio1 23 GPIO_ACTIVE_LOW>;
+        };
+    };