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 so that "resets" may have either one or two entries, depending
on the compatible string.

Signed-off-by: Ovidiu Panait <ovidiu.panait.rb@renesas.com>
---
 .../bindings/rtc/renesas,rz-rtca3.yaml        | 33 ++++++++++++++++---
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/renesas,rz-rtca3.yaml b/Documentation/devicetree/bindings/rtc/renesas,rz-rtca3.yaml
index e70eeb66aa64..39a5c2483374 100644
--- a/Documentation/devicetree/bindings/rtc/renesas,rz-rtca3.yaml
+++ b/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 +46,8 @@ properties:
     maxItems: 1
 
   resets:
-    items:
-      - description: VBATTB module reset
+    minItems: 1
+    maxItems: 2
 
 required:
   - compatible
@@ -61,6 +59,31 @@ required:
   - power-domains
   - resets
 
+allOf:
+  - $ref: rtc.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a08g045-rtca3
+    then:
+      properties:
+        resets:
+          items:
+            - description: VBATTB module reset
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g057-rtca3
+    then:
+      properties:
+        resets:
+          items:
+            - description: RTC reset
+            - description: Reset for the RTEST registers
+
 additionalProperties: false
 
 examples:
-- 
2.51.0

On 19/10/2025 11:21, Ovidiu Panait wrote:
> 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 so that "resets" may have either one or two entries, depending
> on the compatible string.
> 
> Signed-off-by: Ovidiu Panait <ovidiu.panait.rb@renesas.com>

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

On 19/10/2025 11:21, Ovidiu Panait wrote:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g057-rtca3
> +    then:
> +      properties:
> +        resets:
> +          items:
> +            - description: RTC reset

So this is a completely different type of reset than VBATTB from earlier
device?

> +            - description: Reset for the RTEST registers
> +

Best regards,
Krzysztof