From b07600f50efe84d7e3b431e6d10fe774bb00d573 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Tue, 21 May 2013 20:36:34 -0600 Subject: [PATCH 126/133] 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 Signed-off-by: Mark Brown --- include/linux/spi/spi.h | 2 ++ 1 file changed, 2 insertions(+) --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -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;