No clock found for FDCAN STM32MP157D-DK1

michelman · ‎2023-11-21

Hi,

First of all, I am sure I am completely overlooking something, but I can´t seem to figure this out:

In CubeIDE I added the FDCAN1 peripheral for my STM32MP157D-DK1 board. I then added the device tree to the build. However, when the board has booted up, and I type: dmesg | grep m_can, I get the message:

m_can_platform 4400e000.can: no clock found

It therefore seems that no clock has been enabled for this peripheral. How can I enable the clock?

Thanks!

Michel

PatrickF · ‎2023-11-21

@Hi @michelman ,

please check https://wiki.st.com/stm32mpu/wiki/STM32MP15_clock_tree#Device_tree,

As there is no FDCAN on DK1/DK2 boards, maybe you should check how it is done on EV1 board

Regards.

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michelman · ‎2023-11-21

Hi Patrick,

Thank you for the reply. I created the device tree using cubeIDE, so I would assume that the device tree is correct, but please have a look, as I have the files attached.

Thank you!

Regards,

Michel

PatrickF · ‎2023-11-22

Hi,

in st,clksrc , you are missing CLK_FDCAN_xxxx (e.g. CLK_FDCAN_PLL4R).

As a consequence, you likely does not have any fdcan_k entry if you do:

cat /sys/kernel/debug/clk/clk_summary

Regards.

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Erwan SZYMANSKI · ‎2023-12-11

Hello @michelman ,
The answer is given in the following post : https://community.st.com/t5/stm32-mpus-products/fdcan-can-not-start-no-clock-found/m-p/618224#M10606

Kind regards,
Erwan.

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