linux-kernel - RE: [PATCH v4 0/2] Add FD-Only mode support for R-Car CANFD

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Message-ID:
 <TY3PR01MB11346C434E9B17EE780A010FB8681A@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 12 Jan 2026 15:51:30 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: biju.das.au <biju.das.au@...il.com>, Marc Kleine-Budde
	<mkl@...gutronix.de>, Vincent Mailhol <mailhol@...nel.org>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Geert Uytterhoeven <geert+renesas@...der.be>,
	magnus.damm <magnus.damm@...il.com>
CC: Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Prabhakar
 Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>, biju.das.au
	<biju.das.au@...il.com>
Subject: RE: [PATCH v4 0/2] Add FD-Only mode support for R-Car CANFD

Hi All,

> -----Original Message-----
> From: Biju <biju.das.au@...il.com>
> Sent: 26 November 2025 15:59
> Subject: [PATCH v4 0/2] Add FD-Only mode support for R-Car CANFD
> 
> From: Biju Das <biju.das.jz@...renesas.com>
> 
> The RZ/{G2L,G3E} and R-Car Gen4 SoCs support additional CAN FD mode called FD-only mode. In this mode,
> communication in Classical CAN frame format is disabled. Update binding/driver to support this mode.
> 
> v3->v4:
>  * Dropped the node added in example for just testing.
>  * Dropped the dependencies from covering letter.
> v2->v3:
>  * Added check to disallow the usage of both fd-only and no-can-fd.
> v1->v2:
>  * Added conditional check to disallow fd-only mode for R-Car Gen3 in
>    bindings.
>  * Dropped has_fd_only_mode variable from the struct rcar_canfd_hw_info
>    as it is checked by the dt schema validation.
> 
> Logs:
> root@...rc-rzg3e:~# /cip-test-scripts/canfd_validation.sh FD-ONLY
> [   13.914196] rcar_canfd 12440000.can: global operational state (canfd clk, fd-only mode)
> FD-ONLY
>  [INFO] Testing can0<->can1 with bitrate 1000000 and dbitrate 4000000  [INFO] Bringing down can0 can1
> [INFO] Bringing up can0 can1  [INFO] Testing can1 as producer and can0 as consumer  [INFO] Testing
> can0 as producer and can1 as consumer FD-ONLY  [INFO] Testing can0<->can1 with bitrate 500000 and
> dbitrate 2000000  [INFO] Bringing down can0 can1  [INFO] Bringing up can0 can1  [INFO] Testing can1 as
> producer and can0 as consumer  [INFO] Testing can0 as producer and can1 as consumer FD-ONLY  [INFO]
> Testing can0<->can1 with bitrate 250000 and dbitrate 1000000  [INFO] Bringing down can0 can1  [INFO]
> Bringing up can0 can1  [INFO] Testing can1 as producer and can0 as consumer  [INFO] Testing can0 as
> producer and can1 as consumer
> 
> EXIT|PASS|canfd_validation.sh|[00:00:19] ||
> 
> root@...rc-rzg3e:~# /cip-test-scripts/canfd_validation.sh CANFD
> [   13.914196] rcar_canfd 12440000.can: global operational state (canfd clk, fd-only mode)
> CANFD
>  [INFO] Testing can0<->can1 with bitrate 1000000 and dbitrate 4000000  [INFO] Bringing down can0 can1
> [INFO] Bringing up can0 can1  [INFO] Testing can1 as producer and can0 as consumer
> [   37.246104] can: controller area network core
> [   37.250607] NET: Registered PF_CAN protocol family
> [   37.291606] can: raw protocol
> 
> EXIT|FAIL|canfd_validation.sh|[00:00:04] Problems while producing data
> EXIT|FAIL|from can1 and consuming from can0||
> 
> root@...rc-rzg3e:~# /cip-test-scripts/canfd_validation.sh CAN
> [   13.914196] rcar_canfd 12440000.can: global operational state (canfd clk, fd-only mode)
> CAN
>  [INFO] Testing can0<->can1 with bitrate 1000000  [INFO] Bringing down can0 can1  [INFO] Bringing up
> can0 can1  [INFO] Testing can1 as producer and can0 as consumer
> 
> EXIT|FAIL|canfd_validation.sh|[00:00:03] Problems sending data from can1
> EXIT|FAIL|to can0||
> 
> root@...rc-rzg3e:~#
> 
> Biju Das (2):
>   dt-bindings: can: renesas,rcar-canfd: Document renesas,fd-only
>     property
>   can: rcar_canfd: Add support for FD-Only mode
> 
>  .../bindings/net/can/renesas,rcar-canfd.yaml  | 38 +++++++++++++++++--
>  drivers/net/can/rcar/rcar_canfd.c             | 14 ++++++-
>  2 files changed, 48 insertions(+), 4 deletions(-)
> 
> --
> 2.43.0

Gentle ping.

Cheers,
Biju