Re: [PATCH] spi: rspi: Add configuration for LSB/MSB

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi Hoan-san,

On Wed, Apr 3, 2019 at 11:09 AM Nguyen An Hoan <na-hoan@xxxxxxxxxxx> wrote:
> From: Hoan Nguyen An <na-hoan@xxxxxxxxxxx>
>
> SPI controllers can support LSB or MSB depending on
> the structure of the message that Slave requires,
> Add support.
>
> Signed-off-by: Hoan Nguyen An <na-hoan@xxxxxxxxxxx>

Thanks for your patch!

> --- a/drivers/spi/spi-rspi.c
> +++ b/drivers/spi/spi-rspi.c
> @@ -950,6 +950,8 @@ static int rspi_prepare_message(struct spi_controller *ctlr,
>                 rspi->spcmd |= SPCMD_CPOL;
>         if (spi->mode & SPI_CPHA)
>                 rspi->spcmd |= SPCMD_CPHA;
> +       if (spi->mode & SPI_LSB_FIRST)
> +               rspi->spcmd |= SPCMD_LSBF;
>
>         /* CMOS output mode and MOSI signal from previous transfer */
>         rspi->sppcr = 0;

Unfortunately this is not sufficient.  The driver should also inform the
SPI core that it supports this flag. Will fix.

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