Re: [PATCH 4/8] spidev: Add Pensando CPLD compatible

[Arnd Bergmann <arnd@xxxxxxxx>]

On Thu, Mar 4, 2021 at 4:41 AM Brad Larson <brad@xxxxxxxxxxx> wrote:
>
> Pensando Elba SoC platforms have a SPI connected CPLD
> for platform management.
>
> Signed-off-by: Brad Larson <brad@xxxxxxxxxxx>
> ---
>  drivers/spi/spidev.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
> index 8cb4d923aeaa..8b285852ce82 100644
> --- a/drivers/spi/spidev.c
> +++ b/drivers/spi/spidev.c
> @@ -683,6 +683,7 @@ static const struct of_device_id spidev_dt_ids[] = {
>         { .compatible = "dh,dhcom-board" },
>         { .compatible = "menlo,m53cpld" },
>         { .compatible = "cisco,spi-petra" },
> +       { .compatible = "pensando,cpld" },
>         {},
>  };

This does not seem appropriate, I think a platform management driver should
have a proper kernel abstraction instead of a user passthrough.

As mentioned elsewhere, it also needs to be way more specific. If this
is a programmable block, the compatible string might in fact need to
contain both a board identifier and a revision number for the programmable
logic, to ensure that the driver knows how to talk to it.

      Arnd