From: Stephen Warren <swarren@wwwdotorg.org>
Date: Wed, 22 May 2013 02:36:34 +0000 (-0600)
Subject: spi: introduce macros to set bits_per_word_mask
X-Git-Tag: firefly_0821_release~176^2~5797^2~18^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2922a8de996956893bb98e4aa91be9774c958336;p=firefly-linux-kernel-4.4.55.git

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>
---

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;