mr_canhubk3: flexcan4 & 5 do not work

[tbultel]

Describe the bug

Using Zephyr v4.3.0 with the NXP mr_canhubk3 board, I successfully flexcan0 to flexcan3
But there is no communication on flexcan4 & flexcan5.
These 2 CANs use a special secured transceiver : the TJA1153.
Is there a special undocumented step to do to make that work ?
Thanks !

Regression

• This is a regression.

Steps to reproduce

BOARD=mr_canhubk3/s32k344
OVERLAY=boards/mr-canhubk344.overlay

Relevant log output

Impact

Annoyance – Minor irritation; no significant impact on usability or functionality.

Environment

No response

Additional Context

No response

[henrikbrixandersen]

But there is no communication on flexcan4 & flexcan5.
These 2 CANs use a special secured transceiver : the TJA1153.
Is there a special undocumented step to do to make that work ?

It's not documented in Zephyr. You need to refer to the NXP documentation on how to configure these secure CAN transceivers after reset.

A few hints can be found in the following links:

• https://github.com/noxuz/Secure_CAN-FD_TJA1153_NXP/blob/25e55c9aea092aa6d7639b07812d53ba4961b264/src/FlexCAN_demo.c#L215
• https://community.nxp.com/t5/Model-Based-Design-Toolbox-MBDT/how-to-use-MBDT-to-initialize-the-TJA1153-CAN-on-MRCANHUBK344/m-p/1784779

[DerekSnell]

Hi @tbultel ,
In addition, the NXP MCUXpresso SDK provides configuration code for the TJA1152, which is quite helpful and can guide users in configuring the TJA1153 as well. Please note that the datasheet for these secure transceivers are available with Secure Access Rights. Best regards