1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index b9d0efb6803f..4a6fe01831a8 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -78,7 +78,7 @@ config SPI_AU1550
           will be called au1550_spi.
 
 config SPI_BITBANG
-        tristate "Bitbanging SPI master"
+        tristate "Utilities for Bitbanging SPI masters"
         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
@@ -100,6 +100,22 @@ config SPI_BUTTERFLY
           inexpensive battery powered microcontroller evaluation board.
           This same cable can be used to flash new firmware.
 
+config SPI_GPIO
+        tristate "GPIO-based bitbanging SPI Master"
+        depends on GENERIC_GPIO
+        select SPI_BITBANG
+        help
+          This simple GPIO bitbanging SPI master uses the arch-neutral GPIO
+          interface to manage MOSI, MISO, SCK, and chipselect signals.  SPI
+          slaves connected to a bus using this driver are configured as usual,
+          except that the spi_board_info.controller_data holds the GPIO number
+          for the chipselect used by this controller driver.
+
+          Note that this driver often won't achieve even 1 Mbit/sec speeds,
+          making it unusually slow for SPI.  If your platform can inline
+          GPIO operations, you should be able to leverage that for better
+          speed with a custom version of this driver; see the source code.
+
 config SPI_IMX
         tristate "Freescale iMX SPI controller"
         depends on ARCH_IMX && EXPERIMENTAL