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Date: Thu, 19 Feb 2009 12:06:17 +0100 From: Michael Buesch <mb@...sch.de> To: David Brownell <dbrownell@...rs.sourceforge.net> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: [PATCH] spi_bitbang: Add more lowlevel function documentation This adds more documentation of the lowlevel API to avoid future bugs. Signed-off-by: Michael Buesch <mb@...sch.de> --- 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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