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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251126155911.320563-1-biju.das.jz@bp.renesas.com>
Date: Wed, 26 Nov 2025 15:59:05 +0000
From: Biju <biju.das.au@...il.com>
To: 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: Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	linux-can@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>
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 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 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