[PATCH 1/2] dt-bindings: rtc: nct3018y: add nuvoton,ctrl-reg-val property

Add "nuvoton,ctrl-reg-val" vendor property to allow optional
initialization of the RTC control register (0x0A).

This allows platform-specific configurations like 24h mode and
write ownership to be defined via Device Tree.

Signed-off-by: David Wang <[email protected]>
---
 Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml b/Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
index 4f9b5604acd9..0984dfb77170 100644
--- a/Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
+++ b/Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
@@ -24,6 +24,10 @@ properties:
 
   reset-source: true
 
+  nuvoton,ctrl-reg-val:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Initial value for the control register (0x0A).
+
 required:
   - compatible
   - reg
@@ -39,6 +43,7 @@ examples:
         rtc@6f {
             compatible = "nuvoton,nct3018y";
             reg = <0x6f>;
+            nuvoton,ctrl-reg-val = <0x21>;
         };
     };
 
-- 
2.34.1