From: Biju Das <biju.das.jz@bp.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.

This patch series depend upon[1]
[1] https://lore.kernel.org/all/20251118123926.193445-1-biju.das.jz@bp.renesas.com/

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@smarc-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@smarc-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@smarc-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@smarc-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  | 74 ++++++++++++++++++-
 drivers/net/can/rcar/rcar_canfd.c             | 14 +++-
 2 files changed, 84 insertions(+), 4 deletions(-)

-- 
2.43.0