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authorMichael Hennerich <michael.hennerich@analog.com>2009-04-06 22:00:51 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 11:31:06 -0400
commit42c78b2bf51bafb4cfa98dfecc28dd9b8bcd04b0 (patch)
tree12960b010ec28ff6e5cfeb4a640681464781f51e /arch/blackfin
parente7d02e3c9577f070bc77354763bed7f24713dc53 (diff)
Blackfin SPI Driver: Add GPIO controlled SPI Slave Select support
Add support for GPIO controlled SPI Chip Selects. To make use of this feature, set chip_select = 0 and add a proper cs_gpio to your controller_data. struct spi_board_info .chip_select = 0 struct bfin5xx_spi_chip .cs_gpio = GPIO_P### There are various SPI devices that require SPI MODE_0, and need to have the Chip Selects asserted during the entire transfer. Consider using SPI_MODE_3 (SPI_CPHA | SPI_CPOL) if your device allows it. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/include/asm/bfin5xx_spi.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/bfin5xx_spi.h b/arch/blackfin/include/asm/bfin5xx_spi.h
index ea2d24af9542..8c5f8a977a66 100644
--- a/arch/blackfin/include/asm/bfin5xx_spi.h
+++ b/arch/blackfin/include/asm/bfin5xx_spi.h
@@ -124,6 +124,7 @@ struct bfin5xx_spi_chip {
124 u8 bits_per_word; 124 u8 bits_per_word;
125 u8 cs_change_per_word; 125 u8 cs_change_per_word;
126 u16 cs_chg_udelay; /* Some devices require 16-bit delays */ 126 u16 cs_chg_udelay; /* Some devices require 16-bit delays */
127 u32 cs_gpio;
127}; 128};
128 129
129#endif /* _SPI_CHANNEL_H_ */ 130#endif /* _SPI_CHANNEL_H_ */