Merge patch series "Add FD-Only mode support for R-Car CANFD"

Merge patch series "Add FD-Only mode support for R-Car CANFD"

Biju <biju.das.au@gmail.com> says:

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.

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@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||

Link: https://patch.msgid.link/20251126155911.320563-1-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>