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David Brownell8ae12a02006-01-08 13:34:19 -08001#
2# SPI driver configuration
3#
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.
7#
8menu "SPI support"
9
10config SPI
11 bool "SPI support"
12 help
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.
18
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.
24
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.
29
30config SPI_DEBUG
31 boolean "Debug support for SPI drivers"
32 depends on SPI && DEBUG_KERNEL
33 help
34 Say "yes" to enable debug messaging (like dev_dbg and pr_debug),
35 sysfs, and debugfs support in SPI controller and protocol drivers.
36
37#
38# MASTER side ... talking to discrete SPI slave chips including microcontrollers
39#
40
41config SPI_MASTER
42# boolean "SPI Master Support"
43 boolean
44 default SPI
45 help
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
49 that are connected.
50
51comment "SPI Master Controller Drivers"
52 depends on SPI_MASTER
53
David Brownell9904f222006-01-08 13:34:26 -080054config SPI_BITBANG
55 tristate "Bitbanging SPI master"
56 depends on SPI_MASTER && EXPERIMENTAL
57 help
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.
63
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.
David Brownell8ae12a02006-01-08 13:34:19 -080067
68#
69# Add new SPI master controllers in alphabetical order above this line
70#
71
72
73#
74# There are lots of SPI device types, with sensors and memory
75# being probably the most widely used ones.
76#
77comment "SPI Protocol Masters"
78 depends on SPI_MASTER
79
80
81#
82# Add new SPI protocol masters in alphabetical order above this line
83#
84
85
86# (slave support would go here)
87
88endmenu # "SPI support"
89