* Re: [PATCH] spi: rspi: Add configuration for LSB/MSB
[not found] ` <1554282541-8952-1-git-send-email-na-hoan-HEF513clHfp3+QwDJ9on6Q@public.gmane.org>
@ 2020-02-18 10:56 ` Geert Uytterhoeven
0 siblings, 0 replies; only message in thread
From: Geert Uytterhoeven @ 2020-02-18 10:56 UTC (permalink / raw)
To: Nguyen An Hoan
Cc: Linux-Renesas, linux-spi, Kuninori Morimoto, Yoshihiro Shimoda,
稲吉,
カオ・ヴァン・ドン
Hi Hoan-san,
On Wed, Apr 3, 2019 at 11:09 AM Nguyen An Hoan <na-hoan-HEF513clHfp3+QwDJ9on6Q@public.gmane.org> wrote:
> From: Hoan Nguyen An <na-hoan-HEF513clHfp3+QwDJ9on6Q@public.gmane.org>
>
> 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-HEF513clHfp3+QwDJ9on6Q@public.gmane.org>
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-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
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
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2020-02-18 10:56 ` [PATCH] spi: rspi: Add configuration for LSB/MSB Geert Uytterhoeven
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