diff options
Diffstat (limited to 'target/linux/ramips/patches-3.10/0126-spi-introduce-macros-to-set-bits_per_word_mask.patch')
-rw-r--r-- | target/linux/ramips/patches-3.10/0126-spi-introduce-macros-to-set-bits_per_word_mask.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.10/0126-spi-introduce-macros-to-set-bits_per_word_mask.patch b/target/linux/ramips/patches-3.10/0126-spi-introduce-macros-to-set-bits_per_word_mask.patch new file mode 100644 index 0000000000..1dcba05078 --- /dev/null +++ b/target/linux/ramips/patches-3.10/0126-spi-introduce-macros-to-set-bits_per_word_mask.patch @@ -0,0 +1,29 @@ +From b07600f50efe84d7e3b431e6d10fe774bb00d573 Mon Sep 17 00:00:00 2001 +From: Stephen Warren <swarren@wwwdotorg.org> +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 <swarren@wwwdotorg.org> +Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> +--- + 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; |