issues communicating with SPI on Raspberry Pi 3

issues communicating with SPI on Raspberry Pi 3

[Kai Che]

Hi all,

I'm trying to communicate with a TPM 2.0 (infineon,slb9670) over SPI on a Raspberry Pi 3 in barebox.

CONFIG_SPI=y
CONFIG_DRIVER_SPI_GPIO=y
CONFIG_CMD_SPI=y

are set in the barebox configuration and

dtparam=spi=on

is set in the /boot/config.txt on the raspberry pi.

But when checking /dev/ on barebox, there is nothing related to spi except cs0.

I would have expected something similiar to /dev/spidev0.0 showing up.

Did I miss any configurations?

Best Regrds,

Kai Che
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Re: issues communicating with SPI on Raspberry Pi 3

[Sascha Hauer]

On Wed, Dec 05, 2018 at 03:22:40PM +0000, Kai Che wrote:
> Hi all,
> 
> I'm trying to communicate with a TPM 2.0 (infineon,slb9670) over SPI on a Raspberry Pi 3 in barebox.
> 
> CONFIG_SPI=y
> CONFIG_DRIVER_SPI_GPIO=y
> CONFIG_CMD_SPI=y
> 
> are set in the barebox configuration and
> 
> dtparam=spi=on
> 
> is set in the /boot/config.txt on the raspberry pi.
> 
> But when checking /dev/ on barebox, there is nothing related to spi except cs0.
> 
> I would have expected something similiar to /dev/spidev0.0 showing up.

I you want to communicate with a SPI device directly without the driver,
there's the 'spi' command. It directly uses internal functions without
the need of any file in /dev/.

We don't have any bcm283x SPI driver in barebox. You probably already
noticed that and enable the spi-gpio driver for this reason. However,
you'll need the appropriate device nodes (Compatible to "spi-gpio")
and the pinctrl setup to make this work.

Sascha

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