1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index d3105104a297..9b21c5d77b4a 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