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#
# 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 microcontollers 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.
#
# Add new SPI master controllers in alphabetical order above this line
#
#
# 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"
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