2 # SPI driver configuration
4 # NOTE: the reason this doesn't show SPI slave support is mostly that
5 # nobody's needed a slave side API yet. The master-role API is not
6 # fully appropriate there, so it'd need some thought to do well.
13 The "Serial Peripheral Interface" is a low level synchronous
14 protocol. Chips that support SPI can have data transfer rates
15 up to several tens of Mbit/sec. Chips are addressed with a
16 controller and a chipselect. Most SPI slaves don't support
17 dynamic device discovery; some are even write-only or read-only.
19 SPI is widely used by microcontollers to talk with sensors,
20 eeprom and flash memory, codecs and various other controller
21 chips, analog to digital (and d-to-a) converters, and more.
22 MMC and SD cards can be accessed using SPI protocol; and for
23 DataFlash cards used in MMC sockets, SPI must always be used.
25 SPI is one of a family of similar protocols using a four wire
26 interface (select, clock, data in, data out) including Microwire
27 (half duplex), SSP, SSI, and PSP. This driver framework should
28 work with most such devices and controllers.
31 boolean "Debug support for SPI drivers"
32 depends on SPI && DEBUG_KERNEL
34 Say "yes" to enable debug messaging (like dev_dbg and pr_debug),
35 sysfs, and debugfs support in SPI controller and protocol drivers.
38 # MASTER side ... talking to discrete SPI slave chips including microcontrollers
42 # boolean "SPI Master Support"
46 If your system has an master-capable SPI controller (which
47 provides the clock and chipselect), you can enable that
48 controller and the protocol drivers for the SPI slave chips
51 comment "SPI Master Controller Drivers"
55 tristate "Bitbanging SPI master"
56 depends on SPI_MASTER && EXPERIMENTAL
58 With a few GPIO pins, your system can bitbang the SPI protocol.
59 Select this to get SPI support through I/O pins (GPIO, parallel
60 port, etc). Or, some systems' SPI master controller drivers use
61 this code to manage the per-word or per-transfer accesses to the
62 hardware shift registers.
64 This is library code, and is automatically selected by drivers that
65 need it. You only need to select this explicitly to support driver
66 modules that aren't part of this kernel tree.
69 tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)"
70 depends on SPI_MASTER && PARPORT && EXPERIMENTAL
73 This uses a custom parallel port cable to connect to an AVR
74 Butterfly <http://www.atmel.com/products/avr/butterfly>, an
75 inexpensive battery powered microcontroller evaluation board.
76 This same cable can be used to flash new firmware.
79 # Add new SPI master controllers in alphabetical order above this line
84 # There are lots of SPI device types, with sensors and memory
85 # being probably the most widely used ones.
87 comment "SPI Protocol Masters"
92 # Add new SPI protocol masters in alphabetical order above this line
96 # (slave support would go here)
98 endmenu # "SPI support"