dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Document reset-names

All SoCs have multiple resets.  Document the reset-names property.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260317101627.174491-2-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml

@@ -78,6 +78,16 @@ properties:
           - description: PFC main reset
           - description: Reset for the control register related to WDTUDFCA and WDTUDFFCM pins
 
+  reset-names:
+    oneOf:
+      - items:
+          - const: rstn
+          - const: port
+          - const: spare
+      - items:
+          - const: main
+          - const: error
+
 additionalProperties:
   anyOf:
     - type: object
@@ -152,10 +162,14 @@ allOf:
       properties:
         resets:
           maxItems: 2
+        reset-names:
+          maxItems: 2
     else:
       properties:
         resets:
           minItems: 3
+        reset-names:
+          minItems: 3
 
 required:
   - compatible
@@ -187,6 +201,7 @@ examples:
             resets = <&cpg R9A07G044_GPIO_RSTN>,
                      <&cpg R9A07G044_GPIO_PORT_RESETN>,
                      <&cpg R9A07G044_GPIO_SPARE_RESETN>;
+            reset-names = "rstn", "port", "spare";
             power-domains = <&cpg>;
 
             scif0_pins: serial0 {