xref: /linux/drivers/spi/Kconfig (revision 3cb2fccc5f48a4d6269dfd00b4db570fca2a04d5)

#
# SPI driver configuration
#
# NOTE:  the reason this doesn't show SPI slave support is mostly that
# nobody's needed a slave side API yet.  The master-role API is not
# fully appropriate there, so it'd need some thought to do well.
#
menu "SPI support"

config SPI
	bool "SPI support"
	help
	  The "Serial Peripheral Interface" is a low level synchronous
	  protocol.  Chips that support SPI can have data transfer rates
	  up to several tens of Mbit/sec.  Chips are addressed with a
	  controller and a chipselect.  Most SPI slaves don't support
	  dynamic device discovery; some are even write-only or read-only.

	  SPI is widely used by microcontrollers to talk with sensors,
	  eeprom and flash memory, codecs and various other controller
	  chips, analog to digital (and d-to-a) converters, and more.
	  MMC and SD cards can be accessed using SPI protocol; and for
	  DataFlash cards used in MMC sockets, SPI must always be used.

	  SPI is one of a family of similar protocols using a four wire
	  interface (select, clock, data in, data out) including Microwire
	  (half duplex), SSP, SSI, and PSP.  This driver framework should
	  work with most such devices and controllers.

config SPI_DEBUG
	boolean "Debug support for SPI drivers"
	depends on SPI && DEBUG_KERNEL
	help
	  Say "yes" to enable debug messaging (like dev_dbg and pr_debug),
	  sysfs, and debugfs support in SPI controller and protocol drivers.

#
# MASTER side ... talking to discrete SPI slave chips including microcontrollers
#

config SPI_MASTER
#	boolean "SPI Master Support"
	boolean
	default SPI
	help
	  If your system has an master-capable SPI controller (which
	  provides the clock and chipselect), you can enable that
	  controller and the protocol drivers for the SPI slave chips
	  that are connected.

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.

config SPI_BUTTERFLY
	tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)"
	depends on SPI_MASTER && PARPORT && EXPERIMENTAL
	select SPI_BITBANG
	help
	  This uses a custom parallel port cable to connect to an AVR
	  Butterfly <http://www.atmel.com/products/avr/butterfly>, an
	  inexpensive battery powered microcontroller evaluation board.
	  This same cable can be used to flash new firmware.

config SPI_MPC83xx
	tristate "Freescale MPC83xx SPI controller"
	depends on SPI_MASTER && PPC_83xx && EXPERIMENTAL
	select SPI_BITBANG
	help
	  This enables using the Freescale MPC83xx SPI controller in master
	  mode.

	  Note, this driver uniquely supports the SPI controller on the MPC83xx
	  family of PowerPC processors.  The MPC83xx uses a simple set of shift
	  registers for data (opposed to the CPM based descriptor model).

config SPI_PXA2XX
	tristate "PXA2xx SSP SPI master"
	depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL
	help
	  This enables using a PXA2xx SSP port as a SPI master controller.
	  The driver can be configured to use any SSP port and additional
	  documentation can be found a Documentation/spi/pxa2xx.

config SPI_S3C24XX_GPIO
	tristate "Samsung S3C24XX series SPI by GPIO"
	depends on SPI_MASTER && ARCH_S3C2410 && SPI_BITBANG && EXPERIMENTAL
	help
	  SPI driver for Samsung S3C24XX series ARM SoCs using
	  GPIO lines to provide the SPI bus. This can be used where
	  the inbuilt hardware cannot provide the transfer mode, or
	  where the board is using non hardware connected pins.
#
# Add new SPI master controllers in alphabetical order above this line
#


config SPI_S3C24XX
	tristate "Samsung S3C24XX series SPI"
	depends on SPI_MASTER && ARCH_S3C2410 && EXPERIMENTAL
	help
	  SPI driver for Samsung S3C24XX series ARM SoCs

#
# There are lots of SPI device types, with sensors and memory
# being probably the most widely used ones.
#
comment "SPI Protocol Masters"
	depends on SPI_MASTER


#
# Add new SPI protocol masters in alphabetical order above this line
#


# (slave support would go here)

endmenu # "SPI support"