Blackfin SPI Driver: Add GPIO controlled SPI Slave Select support

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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>

...

This commit is contained in:

Michael Hennerich 2009-04-06 19:00:51 -07:00 • committed by Linus Torvalds

parent e7d02e3c95

commit 42c78b2bf5

2 changed files with 33 additions and 8 deletions

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arch/blackfin/include/asm/bfin5xx_spi.h

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40

drivers/spi/spi_bfin5xx.c

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