target/linux/ramips/patches-3.10/0126-spi-introduce-macros-to-set-bits_per_word_mask.patch

   1 From b07600f50efe84d7e3b431e6d10fe774bb00d573 Mon Sep 17 00:00:00 2001
   2 From: Stephen Warren <swarren@wwwdotorg.org>
   3 Date: Tue, 21 May 2013 20:36:34 -0600
   4 Subject: [PATCH 126/133] spi: introduce macros to set bits_per_word_mask
   5
   6 Introduce two macros to make setting up spi_master.bits_per_word_mask
   7 easier, and avoid mistakes like writing BIT(n) instead of BIT(n - 1).
   8
   9 SPI_BPW_MASK is for a single supported value of bits_per_word_mask.
  10
  11 SPI_BPW_RANGE_MASK represents a contiguous set of bit lengths.
  12
  13 Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
  14 Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
  15 ---
  16  include/linux/spi/spi.h |    2 ++
  17  1 file changed, 2 insertions(+)
  18
  19 --- a/include/linux/spi/spi.h
  20 +++ b/include/linux/spi/spi.h
  21 @@ -308,6 +308,8 @@ struct spi_master {
  22
  23         /* bitmask of supported bits_per_word for transfers */
  24         u32                     bits_per_word_mask;
  25 +#define SPI_BPW_MASK(bits) BIT((bits) - 1)
  26 +#define SPI_BPW_RANGE_MASK(min, max) ((BIT(max) - 1) - (BIT(min) - 1))
  27
  28         /* other constraints relevant to this driver */
  29         u16                     flags;