linux-kernel - Re: [spi-devel-general] [Patch] Add spi full duplex mode transfer support

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Message-Id: <200608292152.58616.david-b@pacbell.net>
Date:	Tue, 29 Aug 2006 21:52:57 -0700
From:	David Brownell <david-b@...bell.net>
To:	spi-devel-general@...ts.sourceforge.net
Cc:	"Luke Yang" <luke.adi@...il.com>, linux-kernel@...r.kernel.org,
	dbrownell@...rs.sourceforge.net
Subject: Re: [spi-devel-general] [Patch] Add spi full duplex mode transfer support

On Tuesday 29 August 2006 9:40 pm, Luke Yang wrote:
> Hi all,
> 
>    To enable full duplex mode spi transfer in Blackfin spi master
> driver, I need an extra field in spi_transfer structure. Attached the
> right format patch.

I don't understand.  ** ALL ** SPI transfers are full duplex.
If you want half duplex, just don't provide the buffer for the
transfer going in that direction (RX or TX).

Rejected ...


> Signed-off-by: Luke Yang <luke.adi@...il.com>
> 
>  spi.h |    1 +
>  1 files changed, 1 insertion(+)
> 
> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> index c8bb680..99816eb 100644
> --- a/include/linux/spi/spi.h
> +++ b/include/linux/spi/spi.h
> @@ -331,6 +331,7 @@ struct spi_transfer {
>         dma_addr_t      rx_dma;
> 
>         unsigned        cs_change:1;
> +       unsigned        is_duplex:1;
>         u8              bits_per_word;
>         u16             delay_usecs;
>         u32             speed_hz;
> 
> -- 
> Best regards,
> Luke Yang
> luke.adi@...il.com
> 
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