dt-bindings: watchdog: convert meson-wdt.txt to dt-schema

Convert the Amlogic Meson6 SoCs Watchdog timer bindings to dt-schema.

Take in account the used interrupts property.

The "amlogic,meson8-wdt" representation has been simplified
since there's no users of this compatible used along the
"amlogic,meson6-wdt".
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20221117-b4-amlogic-bindings-convert-v3-3-e28dd31e3bed@linaro.orgSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/amlogic,meson6-wdt.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/amlogic,meson6-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic Meson6 SoCs Watchdog timer
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+  - Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - amlogic,meson6-wdt
+          - amlogic,meson8-wdt
+          - amlogic,meson8b-wdt
+      - items:
+          - const: amlogic,meson8m2-wdt
+          - const: amlogic,meson8b-wdt
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - interrupts
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    wdt: watchdog@c1109900 {
+        compatible = "amlogic,meson6-wdt";
+        reg = <0xc1109900 0x8>;
+        interrupts = <GIC_SPI 0 IRQ_TYPE_EDGE_RISING>;
+        timeout-sec = <10>;
+    };

Documentation/devicetree/bindings/watchdog/meson-wdt.txt

-Meson SoCs Watchdog timer
-
-Required properties:
-
-- compatible : depending on the SoC this should be one of:
-	"amlogic,meson6-wdt" on Meson6 SoCs
-	"amlogic,meson8-wdt" and "amlogic,meson6-wdt" on Meson8 SoCs
-	"amlogic,meson8b-wdt" on Meson8b SoCs
-	"amlogic,meson8m2-wdt" and "amlogic,meson8b-wdt" on Meson8m2 SoCs
-- reg : Specifies base physical address and size of the registers.
-
-Optional properties:
-- timeout-sec: contains the watchdog timeout in seconds.
-
-Example:
-
-wdt: watchdog@c1109900 {
-	compatible = "amlogic,meson6-wdt";
-	reg = <0xc1109900 0x8>;
-	timeout-sec = <10>;
-};