dt-bindings: watchdog: samsung-wdt: Add exynos990-wdt compatible

Add a dt-binding compatible for the Exynos990 Watchdog timer.
This watchdog is compatible with the GS101/Exynos850 design, as
such it requires the cluster-index and syscon-phandle properties
to be present. It also contains a cl2 cluster, as such the
cluster-index property has been expanded.

Signed-off-by: Igor Belwon <igor.belwon@mentallysanemainliners.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250420-wdt-resends-april-v1-1-f58639673959@mentallysanemainliners.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: BotchedRPR

Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml

@@ -25,6 +25,7 @@ properties:
           - samsung,exynos5420-wdt                # for Exynos5420
           - samsung,exynos7-wdt                   # for Exynos7
           - samsung,exynos850-wdt                 # for Exynos850
+          - samsung,exynos990-wdt                 # for Exynos990
           - samsung,exynosautov9-wdt              # for Exynosautov9
           - samsung,exynosautov920-wdt            # for Exynosautov920
       - items:
@@ -49,14 +50,14 @@ properties:
   samsung,cluster-index:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-      Index of CPU cluster on which watchdog is running (in case of Exynos850
-      or Google gs101).
+      Index of CPU cluster on which watchdog is running (in case of Exynos850,
+      Exynos990 or Google gs101).
 
   samsung,syscon-phandle:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
       Phandle to the PMU system controller node (in case of Exynos5250,
-      Exynos5420, Exynos7, Exynos850 and gs101).
+      Exynos5420, Exynos7, Exynos850, Exynos990 and gs101).
 
 required:
   - compatible
@@ -77,6 +78,7 @@ allOf:
               - samsung,exynos5420-wdt
               - samsung,exynos7-wdt
               - samsung,exynos850-wdt
+              - samsung,exynos990-wdt
               - samsung,exynosautov9-wdt
               - samsung,exynosautov920-wdt
     then:
@@ -89,6 +91,7 @@ allOf:
             enum:
               - google,gs101-wdt
               - samsung,exynos850-wdt
+              - samsung,exynos990-wdt
               - samsung,exynosautov9-wdt
               - samsung,exynosautov920-wdt
     then:
@@ -102,7 +105,7 @@ allOf:
             - const: watchdog
             - const: watchdog_src
         samsung,cluster-index:
-          enum: [0, 1]
+          enum: [0, 1, 2]
       required:
         - samsung,cluster-index
     else: