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authorDavid Brownell <david-b@pacbell.net>2006-01-08 13:34:26 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-01-13 16:29:55 -0800
commit9904f22a7202c6b54e96b0cc9870817013c350a1 (patch)
tree02d526b1bf54b1c64e58a9f903269f9cdc6ec83c /drivers/spi/Kconfig
parent2e5a7bd978bf4118a0c8edf2e6ff81d0a72fee47 (diff)
[PATCH] spi: add spi_bitbang driver
This adds a bitbanging spi master, hooking up to board/adapter-specific glue code which knows how to set and read the signals (gpios etc). This code kicks in after the glue code creates a platform_device with the right platform_data. That data includes I/O loops, which will usually come from expanding an inline function (provided in the header). One goal is that the I/O loops should be easily optimized down to a few GPIO register accesses, in common cases, for speed and minimized overhead. This understands all the currently defined protocol tweaking options in the SPI framework, and might eventually serve as as reference implementation. - different word sizes (1..32 bits) - differing clock rates - SPI modes differing by CPOL (affecting chip select and I/O loops) - SPI modes differing by CPHA (affecting I/O loops) - delays (usecs) after transfers - temporarily deselecting chips in mid-transfer A lot of hardware could work with this framework, though common types of controller can't reach peak performance without switching to a driver structure that supports pipelining of transfers (e.g. DMA queues) and maybe controllers (e.g. IRQ driven). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/spi/Kconfig')
-rw-r--r--drivers/spi/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index d3105104a29..9b21c5d77b4 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -51,6 +51,19 @@ config SPI_MASTER
comment "SPI Master Controller Drivers"
depends on SPI_MASTER
+config SPI_BITBANG
+ tristate "Bitbanging SPI master"
+ depends on SPI_MASTER && EXPERIMENTAL
+ help
+ With a few GPIO pins, your system can bitbang the SPI protocol.
+ Select this to get SPI support through I/O pins (GPIO, parallel
+ port, etc). Or, some systems' SPI master controller drivers use
+ this code to manage the per-word or per-transfer accesses to the
+ hardware shift registers.
+
+ This is library code, and is automatically selected by drivers that
+ need it. You only need to select this explicitly to support driver
+ modules that aren't part of this kernel tree.
#
# Add new SPI master controllers in alphabetical order above this line