dt-bindings: rtc: renesas,rz-rtca3: Add RZ/V2H support

The Renesas RZ/V2H RTC IP is based on the same RTCA3 IP as RZ/G3S
(r9a08g045), with the following differences:
- It lacks the time capture functionality
- The maximum supported periodic interrupt frequency is 128Hz instead
  of 256Hz
- It requires two reset lines instead of one

Add new compatible string "renesas,r9a09g057-rtca3" for RZ/V2H and update
the binding accordingly:
- Allow "resets" to contain one or two entries depending on the SoC.
- Add "reset-names" property, but make it required only for RZ/V2H.

Signed-off-by: Ovidiu Panait <ovidiu.panait.rb@renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20251107210706.45044-2-ovidiu.panait.rb@renesas.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: Ovidiu Panait

Documentation/devicetree/bindings/rtc/renesas,rz-rtca3.yaml

@@ -9,14 +9,12 @@ title: Renesas RTCA-3 Real Time Clock
 maintainers:
   - Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
 
-allOf:
-  - $ref: rtc.yaml#
-
 properties:
   compatible:
     items:
       - enum:
           - renesas,r9a08g045-rtca3 # RZ/G3S
+          - renesas,r9a09g057-rtca3 # RZ/V2H
       - const: renesas,rz-rtca3
 
   reg:
@@ -48,8 +46,12 @@ properties:
     maxItems: 1
 
   resets:
-    items:
-      - description: VBATTB module reset
+    minItems: 1
+    maxItems: 2
+
+  reset-names:
+    minItems: 1
+    maxItems: 2
 
 required:
   - compatible
@@ -61,6 +63,39 @@ required:
   - power-domains
   - resets
 
+allOf:
+  - $ref: rtc.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a08g045-rtca3
+    then:
+      properties:
+        resets:
+          items:
+            - description: VBATTB module reset
+        reset-names:
+          const: vbattb
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g057-rtca3
+    then:
+      properties:
+        resets:
+          items:
+            - description: RTC reset
+            - description: Reset for the RTEST registers
+        reset-names:
+          items:
+            - const: rtc
+            - const: rtest
+      required:
+        - reset-names
+
 additionalProperties: false
 
 examples:
@@ -81,4 +116,5 @@ examples:
         clock-names = "bus", "counter";
         power-domains = <&cpg>;
         resets = <&cpg R9A08G045_VBAT_BRESETN>;
+        reset-names = "vbattb";
     };