dt-bindings: serial: renesas,rsci: Document RZ/G3L SoC

Document the serial communication interface (RSCI) used on the Renesas
RZ/G3L (R9A08G046) SoC. This SoC integrates the same RSCI IP block as
the RZ/G3E (R9A09G047), but it has 3 clocks compared to 6 clocks on
the RZ/G3E SoC. The RZ/G3L has a single TCLK with internal dividers,
whereas the RZ/G3E has explicit clocks for TCLK and its dividers.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260312082708.98835-2-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/renesas,rsci.yaml

@@ -14,6 +14,7 @@ properties:
   compatible:
     oneOf:
       - enum:
+          - renesas,r9a08g046-rsci # RZ/G3L
           - renesas,r9a09g047-rsci # RZ/G3E
           - renesas,r9a09g077-rsci # RZ/T2H
 
@@ -145,6 +146,31 @@ allOf:
         - resets
         - reset-names
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a08g046-rsci
+    then:
+      properties:
+        interrupts:
+          minItems: 6
+
+        interrupt-names:
+          minItems: 6
+
+        clocks:
+          minItems: 2
+          maxItems: 3
+
+        clock-names:
+          minItems: 2
+          maxItems: 3
+
+      required:
+        - resets
+        - reset-names
+
 unevaluatedProperties: false
 
 examples: