[PATCH RESEND v4 0/8] can: flexcan: Add NXP S32N79 SoC support

[Ciprian Marian Costea]

On 6/3/2026 1:28 PM, Enric Balletbo i Serra wrote:
> Hi Ciprian,
> 
> Sorry in advance for the noise, for some strange reason I didn't get
> or find the cover until now, so I added my tested patch in 1. Doing it
> now properly.
> 
> On Wed, Jun 3, 2026 at 11:44 AM Bough Chen <haibo.chen at oss.nxp.com> wrote:

Hello Marc and Vincent,

Sorry for bothering. Do you expect any more changes to this V4 patchset ?

Best Regards,
Ciprian

>>
>> On Wed, Jun 03, 2026 at 09:13:34AM +0200, Ciprian Costea wrote:
>>> From: Ciprian Marian Costea <ciprianmarian.costea at oss.nxp.com>
>>>
>>> This patch series adds FlexCAN support for the NXP S32N79 SoC.
>>>
>>> The S32N79 is an automotive-grade processor from NXP with multiple
>>> FlexCAN instances. The FlexCAN IP integration on S32N79 differs from
>>> other SoCs in the interrupt routing - it uses two separate interrupt
>>> lines:
>>>    - one interrupt for mailboxes 0-127
>>>    - one interrupt for bus error detection and device state changes
>>>
>>> The CAN controllers are connected through an irqsteer interrupt
>>> controller in the RCU (Resource Control Unit) domain.
>>>
>>> This series:
>>>    1. Splits flexcan_irq() into dedicated handlers for multi-IRQ platforms
>>>    2. Adds dt-bindings documentation for S32N79 FlexCAN
>>>    3. Introduces FLEXCAN_QUIRK_IRQ_BERR to handle the two-interrupt
>>>       configuration
>>>    4. Adds S32N79 device data and compatible string to the driver
>>>    5. Adds FlexCAN device tree nodes for S32N79 SoC
>>>    6. Enables FlexCAN devices on the S32N79-RDB board
>>>
>>> Tested on S32N79-RDB board with CAN and CAN FD communication.
>>
>> Tested on imx95-19x19-evk board with CAN and CAN FD communication. No issue found.
>> This means this patch set do not impact the original platforms.
>>
>> For this patch set, feel free to add tag:
>> Reviewed-and-tested-by: Haibo Chen <haibo.chen at nxp.com>
>>
>> Regards
>> Haibo Chen
> 
> Tested-by: Enric Balletbo i Serra <eballetb at .redhat.com>
> 
> Tested on the NXP S32G399A-RDB3 with loopback and high-rate traffic.
> No regressions observed:
>    CAN frames transmit and receive correctly, with no duplicates.
>    Frame reception showed no errors during stress testing.
> 
> Regards,
>    Enric Balletbo
> 
>>>
>>> This is a resend of v4 with no changes.
>>>
>>> v4 -> v3
>>> - flexcan_chip_interrupts_enable(): disable/enable all IRQ lines
>>>    (not just dev->irq) during IMASK register writes
>>> - Split rx/tx masks per mailbox IRQ line (struct flexcan_mb_irq) so
>>>    each handler on S32G2 only processes its own MB range
>>> - Added received Acked-by tag on DT bindings patch
>>>
>>> v3 -> v2
>>> - Split flexcan_irq() into dedicated handlers (flexcan_irq_mb,
>>>    flexcan_irq_boff, flexcan_irq_berr) to fix duplicate event
>>>    processing when multiple IRQ lines run concurrently (new patch).
>>> - Added flexcan_irq_esr() handler composing state + berr for S32N79
>>> - Ordered quirks used by s32n devtype data by value.
>>>
>>> v2 -> v1
>>> - Renamed FLEXCAN_QUIRK_NR_IRQ_2 to FLEXCAN_QUIRK_IRQ_BERR to better
>>> describe the actual hardware feature
>>> - Appended new quirk at the end
>>> - Switched from platform_get_irq to platform_get_irq_byname usage
>>> - Updated interrupt description in dt-bindings
>>>
>>> Ciprian Marian Costea (8):
>>>    can: flexcan: use dedicated IRQ handlers for multi-IRQ platforms
>>>    can: flexcan: disable all IRQ lines in
>>>      flexcan_chip_interrupts_enable()
>>>    can: flexcan: split rx/tx masks per mailbox IRQ line
>>>    dt-bindings: can: fsl,flexcan: add NXP S32N79 SoC support
>>>    can: flexcan: add FLEXCAN_QUIRK_IRQ_BERR quirk
>>>    can: flexcan: add NXP S32N79 SoC support
>>>    arm64: dts: s32n79: add FlexCAN nodes
>>>    arm64: dts: s32n79: enable FlexCAN devices
>>>
>>>   .../bindings/net/can/fsl,flexcan.yaml         |  30 ++-
>>>   arch/arm64/boot/dts/freescale/s32n79-rdb.dts  |  12 +
>>>   arch/arm64/boot/dts/freescale/s32n79.dtsi     |  50 ++++
>>>   drivers/net/can/flexcan/flexcan-core.c        | 249 +++++++++++++++---
>>>   drivers/net/can/flexcan/flexcan.h             |  12 +-
>>>   5 files changed, 316 insertions(+), 37 deletions(-)
>>>
>>> --
>>> 2.43.0
>>>
>>
>