diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2009-04-06 19:00:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-07 08:31:06 -0700 |
| commit | 42c78b2bf51bafb4cfa98dfecc28dd9b8bcd04b0 (patch) | |
| tree | 12960b010ec28ff6e5cfeb4a640681464781f51e /arch | |
| parent | e7d02e3c9577f070bc77354763bed7f24713dc53 (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')
| -rw-r--r-- | arch/blackfin/include/asm/bfin5xx_spi.h | 1 |
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 { u8 bits_per_word; u8 cs_change_per_word; u16 cs_chg_udelay; /* Some devices require 16-bit delays */ + u32 cs_gpio; }; #endif /* _SPI_CHANNEL_H_ */ |