30 lines
1 KiB
Diff
30 lines
1 KiB
Diff
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From 2922a8de996956893bb98e4aa91be9774c958336 Mon Sep 17 00:00:00 2001
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From: Stephen Warren <swarren@wwwdotorg.org>
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Date: Tue, 21 May 2013 20:36:34 -0600
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Subject: [PATCH] spi: introduce macros to set bits_per_word_mask
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Introduce two macros to make setting up spi_master.bits_per_word_mask
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easier, and avoid mistakes like writing BIT(n) instead of BIT(n - 1).
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SPI_BPW_MASK is for a single supported value of bits_per_word_mask.
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SPI_BPW_RANGE_MASK represents a contiguous set of bit lengths.
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Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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---
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include/linux/spi/spi.h | 2 ++
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1 file changed, 2 insertions(+)
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--- a/include/linux/spi/spi.h
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+++ b/include/linux/spi/spi.h
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@@ -308,6 +308,8 @@ struct spi_master {
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/* bitmask of supported bits_per_word for transfers */
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u32 bits_per_word_mask;
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+#define SPI_BPW_MASK(bits) BIT((bits) - 1)
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+#define SPI_BPW_RANGE_MASK(min, max) ((BIT(max) - 1) - (BIT(min) - 1))
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/* other constraints relevant to this driver */
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u16 flags;
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