From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Specify the expected reset-names for the Renesas CAN-FD controller on
RZ/G2L and RZ/G3E SoCs.

The reset names rstp_n and rstc_n are defined in the SoC hardware manual
and are already used by the driver since commit 76e9353a80e9 ("can:
rcar_canfd: Add support for RZ/G2L family"). The reset-names property
existed previously but was dropped by commit 466c8ef7b66b ("dt-bindings:
can: renesas,rcar-canfd: Simplify the conditional schema").

Restore and constrain reset-names in the binding so DT schema checks
match the actual hardware requirements and driver expectations.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260114154525.3169992-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 .../bindings/net/can/renesas,rcar-canfd.yaml  | 33 +++++++++++--------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
index e129bdceef84..9bfd4f44e4d4 100644
--- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
+++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
@@ -122,6 +122,11 @@ properties:
 
   resets: true
 
+  reset-names:
+    items:
+      - const: rstp_n
+      - const: rstc_n
+
   renesas,no-can-fd:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
@@ -195,13 +200,6 @@ allOf:
           minItems: 2
           maxItems: 2
 
-        reset-names:
-          minItems: 2
-          maxItems: 2
-
-      required:
-        - reset-names
-
   - if:
       properties:
         compatible:
@@ -239,13 +237,6 @@ allOf:
           minItems: 2
           maxItems: 2
 
-        reset-names:
-          minItems: 2
-          maxItems: 2
-
-      required:
-        - reset-names
-
   - if:
       properties:
         compatible:
@@ -299,6 +290,20 @@ allOf:
       properties:
         renesas,no-can-fd: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,r9a09g047-canfd
+              - renesas,rzg2l-canfd
+    then:
+      required:
+        - reset-names
+    else:
+      properties:
+        reset-names: false
+
 unevaluatedProperties: false
 
 examples:
-- 
2.51.0