linux-kernel - Re: [PATCH] ad7877: fix spi word size to 16 bit

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Date:	Thu, 13 May 2010 00:53:35 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Daniel Glöckner <dg@...ix.com>,
	Oskar Schirmer <os@...ix.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Oliver Schneidewind <osw@...ix.com>,
	Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH] ad7877: fix spi word size to 16 bit

On Fri, May 07, 2010 at 02:23:07PM -0400, Mike Frysinger wrote:
> On Fri, May 7, 2010 at 05:41, Daniel Glöckner wrote:
> > On 05/06/2010 08:26 PM, Mike Frysinger wrote:
> >> i think it'd be a better idea to do something like:
> >>   if (spi->bits_per_word != 16) {
> >>     if (spi->bits_per_word) {
> >>       dev_err(&spi->dev, "Invalid SPI settings; bits_per_word must be 16\n");
> >>       return -EINVAL;
> >>     }
> >>     spi->bits_per_word = 16;
> >>     spi_setup(spi);
> >>   }
> >
> > There is no way to set bits_per_word using struct spi_board_info. The
> > description of that structure in spi.h explicitly lists the wordsize as
> > one of the parameters drivers should set themself in probe().
> >
> > Only struct bfin5xx_spi_chip allows to set this value in the board code.
> 
> an obvious shortcoming in the SPI framework that should be fixed, but
> that doesnt make any difference to the above code now does it ?  it'll
> operate correctly regardless of the SPI bus master.

So is the updated patch coming?

-- 
Dmitry
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