Re: Linux as a SPI slave?

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi Jocke,

On Tue, Jun 2, 2020 at 6:38 PM Joakim Tjernlund
<Joakim.Tjernlund@xxxxxxxxxxxx> wrote:
> From what I can tell, the wast uses of SPI in Linux is as an SPI master. Is there
> any use cases as a SPI slave?

It's out there:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/Kconfig#n976

> I fear that the latency can make Linux unsuitable as a SPI slave, has anybody tried?

Please check my FOSDEM presentation for limitations:
https://archive.fosdem.org/2018/schedule/event/hwenablement_linux_as_spi_slave/

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds