Commit 2922a8de authored May 21, 2013 by Stephen Warren Committed by Mark Brown May 22, 2013

spi: introduce macros to set bits_per_word_mask

Introduce two macros to make setting up spi_master.bits_per_word_mask
easier, and avoid mistakes like writing BIT(n) instead of BIT(n - 1).

SPI_BPW_MASK is for a single supported value of bits_per_word_mask.

SPI_BPW_RANGE_MASK represents a contiguous set of bit lengths.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

parent c7788792

include/linux/spi/spi.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -308,6 +308,8 @@ struct spi_master {

		/* bitmask of supported bits_per_word for transfers */
		u32 bits_per_word_mask;
		#define SPI_BPW_MASK(bits) BIT((bits) - 1)
		#define SPI_BPW_RANGE_MASK(min, max) ((BIT(max) - 1) - (BIT(min) - 1))

		/* other constraints relevant to this driver */
		u16 flags;