[PATCH v3 1/4] dt-bindings: rtc: renesas,rz-rtca3: Add RZ/V2H support

Ovidiu Panait
2025-11-03T12:19:05Z

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>
---
.../bindings/rtc/renesas,rz-rtca3.yaml | 45 ++++++++++++++++---
1 file changed, 40 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..2569cb494481 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 +46,12 @@ 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: rtc_rtest
+ required:
+ - reset-names
+
additionalProperties: false

examples:
--
2.51.0