linux-kernel - [PATCH 2/6] dt-bindings: rtc: renesas,rz-rtca3: Add RZ/V2H support

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Message-ID: <20251019092106.5737-3-ovidiu.panait.rb@renesas.com>
Date: Sun, 19 Oct 2025 09:21:02 +0000
From: Ovidiu Panait <ovidiu.panait.rb@...esas.com>
To: claudiu.beznea.uj@...renesas.com,
	alexandre.belloni@...tlin.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	p.zabel@...gutronix.de
Cc: linux-rtc@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org
Subject: [PATCH 2/6] 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 so that "resets" may have either one or two entries, depending
on the compatible string.

Signed-off-by: Ovidiu Panait <ovidiu.panait.rb@...esas.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@...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