linux-kernel - Re: [PATCH] spi_bitbang: Add more lowlevel function documentation

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Date:	Thu, 19 Feb 2009 11:34:05 -0800
From:	David Brownell <david-b@...bell.net>
To:	Michael Buesch <mb@...sch.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi_bitbang: Add more lowlevel function documentation

On Thursday 19 February 2009, Michael Buesch wrote:
> This adds more documentation of the lowlevel API to avoid future bugs.
> 
> Signed-off-by: Michael Buesch <mb@...sch.de>

Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>

... thanks.


> ---
> 
> Index: linux-2.6/include/linux/spi/spi_bitbang.h
> ===================================================================
> --- linux-2.6.orig/include/linux/spi/spi_bitbang.h	2009-02-19 11:59:23.000000000 +0100
> +++ linux-2.6/include/linux/spi/spi_bitbang.h	2009-02-19 12:04:09.000000000 +0100
> @@ -83,6 +83,13 @@ extern int spi_bitbang_stop(struct spi_b
>   *  int getmiso(struct spi_device *);
>   *  void spidelay(unsigned);
>   *
> + * setsck()'s is_on parameter is a zero/nonzero boolean.
> + *
> + * setmosi()'s is_on parameter is a zero/nonzero boolean.
> + *
> + * getmiso() is required to return 0 or 1 only. Any other value is invalid
> + * and will result in improper operation.
> + *
>   * A non-inlined routine would call bitbang_txrx_*() routines.  The
>   * main loop could easily compile down to a handful of instructions,
>   * especially if the delay is a NOP (to run at peak speed).
> 
> -- 
> Greetings, Michael.
> 
> 


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