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

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Date:	Thu, 6 May 2010 14:26:00 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Oskar Schirmer <os@...ix.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Glöckner <dg@...ix.com>,
	Oliver Schneidewind <osw@...ix.com>,
	Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH] ad7877: fix spi word size to 16 bit

On Thu, May 6, 2010 at 06:37, Oskar Schirmer wrote:
> --- a/drivers/input/touchscreen/ad7877.c
> +++ b/drivers/input/touchscreen/ad7877.c
> @@ -669,6 +669,8 @@ static int __devinit ad7877_probe(struct spi_device *spi)
>                dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz);
>                return -EINVAL;
>        }
> +       spi->bits_per_word = 16;
> +       spi_setup(spi);

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);
  }
-mike
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