netdev - [PATCH net-next 1/8] dt-bindings: can: renesas,rcar-canfd: Document renesas,fd-only property

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Message-ID: <20260131101512.1958907-2-mkl@pengutronix.de>
Date: Sat, 31 Jan 2026 11:11:42 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Biju Das <biju.das.jz@...renesas.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 1/8] dt-bindings: can: renesas,rcar-canfd: Document renesas,fd-only property

From: Biju Das <biju.das.jz@...renesas.com>

The CANFD on RZ/{G2L,G3E} and R-Car Gen4 support 3 modes FD-Only mode,
Classical CAN mode and CAN-FD mode. In FD-Only mode, communication in
Classical CAN frame format is disabled. Document renesas,fd-only to handle
this mode. As these SoCs support 3 modes, update the description of
renesas,no-can-fd property and disallow it for R-Car Gen3.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Link: https://patch.msgid.link/20251126155911.320563-2-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 .../bindings/net/can/renesas,rcar-canfd.yaml  | 38 +++++++++++++++++--
 1 file changed, 35 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
index f4ac21c68427..e129bdceef84 100644
--- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
+++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
@@ -125,9 +125,17 @@ properties:
   renesas,no-can-fd:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-      The controller can operate in either CAN FD only mode (default) or
-      Classical CAN only mode.  The mode is global to all channels.
-      Specify this property to put the controller in Classical CAN only mode.
+      The controller can operate in either CAN-FD mode (default) or FD-Only
+      mode (RZ/{G2L,G3E} and R-Car Gen4) or Classical CAN mode. Specify this
+      property to put the controller in Classical CAN mode.
+
+  renesas,fd-only:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      The CANFD on RZ/{G2L,G3E} and R-Car Gen4 SoCs support 3 modes FD-Only
+      mode, Classical CAN mode and CAN-FD mode (default). In FD-Only mode,
+      communication in Classical CAN frame format is disabled. Specify this
+      property to put the controller in FD-Only mode.
 
   assigned-clocks:
     description:
@@ -267,6 +275,30 @@ allOf:
       patternProperties:
         "^channel[6-7]$": false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,rcar-gen3-canfd
+    then:
+      properties:
+        renesas,fd-only: false
+
+  - if:
+      required:
+        - renesas,no-can-fd
+    then:
+      properties:
+        renesas,fd-only: false
+
+  - if:
+      required:
+        - renesas,fd-only
+    then:
+      properties:
+        renesas,no-can-fd: false
+
 unevaluatedProperties: false
 
 examples:

base-commit: 74ecff77dace0f9aead6aac852b57af5d4ad3b85
-- 
2.51.0