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| author | Stephen Warren | 2013-05-22 04:36:34 +0200 |
|---|---|---|
| committer | Mark Brown | 2013-05-22 17:57:43 +0200 |
| commit | 2922a8de996956893bb98e4aa91be9774c958336 (patch) | |
| tree | c9181673361f52877caa50047ecc04dabbd13c0d /include/linux/spi/spi.h | |
| parent | Linux 3.10-rc2 (diff) | |
| download | kernel-qcow2-linux-2922a8de996956893bb98e4aa91be9774c958336.tar.gz kernel-qcow2-linux-2922a8de996956893bb98e4aa91be9774c958336.tar.xz kernel-qcow2-linux-2922a8de996956893bb98e4aa91be9774c958336.zip | |
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>
Diffstat (limited to 'include/linux/spi/spi.h')
| -rw-r--r-- | include/linux/spi/spi.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 6ff26c8db7b9..173725622252 100644 --- 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; |