[PATCH 1/2] spi: introduce SPI_TRANS_FAIL_IO for error reporting

[Linus Walleij]

On Wed, Nov 29, 2023 at 2:32 PM Nam Cao <namcao at linutronix.de> wrote:

> The default message transfer implementation - spi_transfer_one_message -
> invokes the specific device driver's transfer_one(), then waits for
> completion. However, there is no mechanism for the device driver to
> report failure in the middle of the transfer.
>
> Introduce SPI_TRANS_FAIL_IO for drivers to report transfer failure.
>
> Signed-off-by: Nam Cao <namcao at linutronix.de>

This looks useful to me
Acked-by: Linus Walleij <linus.walleij at linaro.org>

>  #define SPI_TRANS_FAIL_NO_START        BIT(0)
> +#define SPI_TRANS_FAIL_IO      BIT(1)

Is it obvious from context when these flags get set?
from transfer_one() and in which flag field?

Otherwise maybe we should add a comment.

Yours,
Linus Walleij