dt-bindings: watchdog: factor out RZ/A watchdog

Renesas created different watchdog IPs but they are all handled in the
same binding documentation. This leads to a lot of conditional handling
which makes it unnecessarily hard to add new items. Factor out the RZ/A
watchdog to make handling easier.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/renesas,rza-wdt.yaml

@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/renesas,rza-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/A Watchdog Timer (WDT) Controller
+
+maintainers:
+  - Wolfram Sang <wsa+renesas@sang-engineering.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r7s72100-wdt     # RZ/A1
+          - renesas,r7s9210-wdt      # RZ/A2
+      - const: renesas,rza-wdt       # RZ/A
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  timeout-sec: true
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+allOf:
+  - $ref: watchdog.yaml#
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r7s72100-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    watchdog@fcfe0000 {
+            compatible = "renesas,r7s72100-wdt", "renesas,rza-wdt";
+            reg = <0xfcfe0000 0x6>;
+            interrupts = <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&p0_clk>;
+    };

Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml

@@ -13,12 +13,6 @@ maintainers:
 properties:
   compatible:
     oneOf:
-      - items:
-          - enum:
-              - renesas,r7s72100-wdt     # RZ/A1
-              - renesas,r7s9210-wdt      # RZ/A2
-          - const: renesas,rza-wdt       # RZ/A
-
       - items:
           - enum:
               - renesas,r9a06g032-wdt    # RZ/N1D
@@ -140,7 +134,6 @@ allOf:
             contains:
               enum:
                 - renesas,r9a09g077-wdt
-                - renesas,rza-wdt
                 - renesas,rzn1-wdt
     then:
       required: