Add CAN nodes for STM32H7 series

[Delsian]

Each STM32H7 Series chip contains 2 or 3 FDCAN controllers.
(https://www.st.com/en/microcontrollers-microprocessors/
stm32h7-series.html)

[alexanderwachter]

Thank you for the addition!
Did you test this on a board?
I was told that there are modifications requited for the h7 series.

[Delsian]

Did you test this on a board?

Just tried with new board. Unfortunately, unsuccessful:

zephyr/drivers/can/can_stm32fd.c:52:29: error: 'LL_RCC_FDCAN_CLKSOURCE_PCLK1' undeclared (first use in this function); did you mean 'LL_RCC_FDCAN_CLKSOURCE_PLL1Q'?                                                              

I will be glad for any suggestion, it's critical for me to run CAN on STM32H7
My DTS node:

&can1 {
	pinctrl-0 = <&fdcan1_rx_pa11 &fdcan1_tx_pa12>;
	pinctrl-names = "default";
	bus-speed = <125000>;
	bus-speed-data = <1000000>;
	sjw = <1>;
	sjw-data = <1>;
	prop-seg = <0>;
	phase-seg1 = <6>;
	phase-seg2 = <5>;
	status = "okay";
};

[henrikbrixandersen]

LGTM.

[alexanderwachter]

@Delsian does it work now on your board?

[erwango]

Set as DNM to avoid merge before we have a proof that it's working

[Delsian]

@alexanderwachter yesterday I got info from the factory: my hardware delays until the middle of January. So, maybe guys from ST (or anybody else) can test if they have boards with FDCAN?

[alexanderwachter]

@Delsian I think you will at least need the following PR:
#41328

[Delsian]

@Delsian I think you will at least need the following PR: #41328

Yes, thank you!

[erwango]

my hardware delays until the middle of January. So, maybe guys from ST (or anybody else) can test if they have boards with FDCAN?

@Delsian If you're pushing something on your own and for your need, the minimum would be that you are able to run it on your side. We can help for non regression or complementary testing when required, but a minimum basic functional testing is expected from the PR's author in any case.

[henrikbrixandersen]

I suggest moving this to draft state until the functionality has been tested on hardware.

[JeremyBCD]

@Delsian I have gotten CAN working on the STM32H7, checkout this PR: #41549

[Delsian]

@JeremyBCD Thank you!