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-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