Pi5 CANbus with Balena

[agregg]

Hi, I am trying to get the Pi5 CANbus to work with Balena OS. I have successfully loaded Balena and I am using dt overlays that work with a different MCP2515-based CAN hat. I doubt these are correct for RevPi. I'm unable to see the can devices in ifconfig. Could you tell me the correct overlays that I should be applying? Thank you!

Under Balena configuration, I'm using:
Define DT Overlays:

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"mcp2515-can1,oscillator=16000000,interrupt=25", "mcp2515-can0,oscillator=16000000,interrupt=23", "spi-bcm2835-overlay"

Define DT Parameters for the Default Overlay:

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"i2c_arm=on","spi=on","audio=on"

[nicolaiB]

Hi

there are several things:

- Connect 5 is using the mcp251863 controll, thus you need to use the mcp251xfd overlay
- Connect 5 uses a 20 MHz oscillator
- You must use the correct pins and SPI interface. The controller is connected to SPI1 with pin 11 as chip select (cs1)
- Controller for spi1 must be enabled with the spi1

Everything together results in the following two overlay definitions

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spi1-2cs,cs1_pin=11
mcp251xfd,spi1-1,interrupt=6,oscillator=20000000

If you're interested on the rest of the hardware or the overlay in general, you can find it here:

https://gitlab.com/revolutionpi/linux/- ... verlay.dts
https://gitlab.com/revolutionpi/linux/- ... verlay.dts

Nicolai

[agregg]

Thanks! I started looking through the overlay files and was almost there. I tried the overlays you recommended:

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"spi1-2cs,cs1_pin=11","mcp251xfd,spi1-1,interrupt=6,oscillator=20000000"

After removing the default param

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spi=on

that was causing a gpio conflict, I was able to get can0 working!
Working on can1 now...

[nicolaiB]

CAN1 is attached to spi5 with irq=25, miso=13, mosi=14, clk=15 and cs=12

https://gitlab.com/revolutionpi/linux/- ... y.dts#L137

This would result in

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"spi5-1cs","mcp251xfd,spi5-1,interrupt=25,oscillator=20000000"

Nicolai

[agregg]

I'm having trouble with that one. I tried adding it with the previous can0 overlay and also just by itself.

I get the following conflict:

root@balena:~# dmesg | grep spi
[ 3.009703] spi spi0.0: chipselect 0 already in use
[ 3.009712] spi_master spi0: spi_device register error /axi/pcie@1000120000/rp1/spi@50000/spidev@0
[ 3.009725] spi_master spi0: Failed to create SPI device for /axi/pcie@1000120000/rp1/spi@50000/spidev@0
[ 3.315641] spi_master spi0: will run message pump with realtime priority
[ 3.354154] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): Failed to read Oscillator Configuration Register (osc=0xffffffff).
[ 3.354162] mcp251xfd spi0.0: error -ENODEV: Failed to detect MCP251xFD.

[nicolaiB]

Please double check the overlay names. In your log file the error is about spi 0 and not 5.

Nicolai

[agregg]

Hi Nicolai, that's what is strange. I'm setting spi5 exactly how you wrote in your post, but the error is coming back as spi0.