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-rw-r--r--drivers/spi/Kconfig18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index b9d0efb6803..4a6fe01831a 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