* issues communicating with SPI on Raspberry Pi 3
@ 2018-12-05 15:22 Kai Che
2018-12-06 8:03 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Kai Che @ 2018-12-05 15:22 UTC (permalink / raw)
To: barebox
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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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: issues communicating with SPI on Raspberry Pi 3
2018-12-05 15:22 issues communicating with SPI on Raspberry Pi 3 Kai Che
@ 2018-12-06 8:03 ` Sascha Hauer
0 siblings, 0 replies; 2+ messages in thread
From: Sascha Hauer @ 2018-12-06 8:03 UTC (permalink / raw)
To: Kai Che; +Cc: barebox
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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