dt-bindings: watchdog: marvell GTI system watchdog driver

Add binding documentation for the Marvell GTI system
watchdog driver.
Signed-off-by: Bharat Bhushan <bbhushan2@marvell.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230803032523.6242-1-bbhushan2@marvell.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/marvell,cn10624-wdt.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/marvell,cn10624-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell Global Timer (GTI) system watchdog
+
+maintainers:
+  - Bharat Bhushan <bbhushan2@marvell.com>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - marvell,cn9670-wdt
+          - marvell,cn10624-wdt
+
+      - items:
+          - enum:
+              - marvell,cn9880-wdt
+              - marvell,cnf9535-wdt
+          - const: marvell,cn9670-wdt
+
+      - items:
+          - enum:
+              - marvell,cn10308-wdt
+              - marvell,cnf10518-wdt
+          - const: marvell,cn10624-wdt
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: refclk
+
+  marvell,wdt-timer-index:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 63
+    description:
+      An SoC have many timers (up to 64), firmware can reserve one or more timer
+      for some other use case and configures one of the global timer as watchdog
+      timer. Firmware will update this field with the timer number configured
+      as watchdog timer.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        watchdog@802000040000 {
+            compatible = "marvell,cn9670-wdt";
+            reg = <0x00008020 0x00040000 0x00000000 0x00020000>;
+            interrupts = <GIC_SPI 38 IRQ_TYPE_EDGE_RISING>;
+            clocks = <&sclk>;
+            clock-names = "refclk";
+            marvell,wdt-timer-index = <63>;
+        };
+    };
+
+...