xref: /openbmc/linux/drivers/i2c/Kconfig (revision 12eb4683)
1#
2# I2C subsystem configuration
3#
4
5menuconfig I2C
6	tristate "I2C support"
7	select RT_MUTEXES
8	---help---
9	  I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
10	  many micro controller applications and developed by Philips.  SMBus,
11	  or System Management Bus is a subset of the I2C protocol.  More
12	  information is contained in the directory <file:Documentation/i2c/>,
13	  especially in the file called "summary" there.
14
15	  Both I2C and SMBus are supported here. You will need this for
16	  hardware sensors support, and also for Video For Linux support.
17
18	  If you want I2C support, you should say Y here and also to the
19	  specific driver for your bus adapter(s) below.
20
21	  This I2C support can also be built as a module.  If so, the module
22	  will be called i2c-core.
23
24if I2C
25
26config I2C_BOARDINFO
27	boolean
28	default y
29
30config I2C_COMPAT
31	boolean "Enable compatibility bits for old user-space"
32	default y
33	help
34	  Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
35	  other user-space package which expects i2c adapters to be class
36	  devices. If you don't know, say Y.
37
38config I2C_CHARDEV
39	tristate "I2C device interface"
40	help
41	  Say Y here to use i2c-* device files, usually found in the /dev
42	  directory on your system.  They make it possible to have user-space
43	  programs use the I2C bus.  Information on how to do this is
44	  contained in the file <file:Documentation/i2c/dev-interface>.
45
46	  This support is also available as a module.  If so, the module
47	  will be called i2c-dev.
48
49config I2C_MUX
50	tristate "I2C bus multiplexing support"
51	depends on HAS_IOMEM
52	help
53	  Say Y here if you want the I2C core to support the ability to
54	  handle multiplexed I2C bus topologies, by presenting each
55	  multiplexed segment as a I2C adapter.
56
57	  This support is also available as a module.  If so, the module
58	  will be called i2c-mux.
59
60source drivers/i2c/muxes/Kconfig
61
62config I2C_HELPER_AUTO
63	bool "Autoselect pertinent helper modules"
64	default y
65	help
66	  Some I2C bus drivers require so-called "I2C algorithm" modules
67	  to work. These are basically software-only abstractions of generic
68	  I2C interfaces. This option will autoselect them so that you don't
69	  have to care.
70
71	  Unselect this only if you need to enable additional helper
72	  modules, for example for use with external I2C bus drivers.
73
74	  In doubt, say Y.
75
76config I2C_SMBUS
77	tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
78	help
79	  Say Y here if you want support for SMBus extensions to the I2C
80	  specification. At the moment, the only supported extension is
81	  the SMBus alert protocol.
82
83	  This support is also available as a module.  If so, the module
84	  will be called i2c-smbus.
85
86source drivers/i2c/algos/Kconfig
87source drivers/i2c/busses/Kconfig
88
89config I2C_STUB
90	tristate "I2C/SMBus Test Stub"
91	depends on m
92	default 'n'
93	help
94	  This module may be useful to developers of SMBus client drivers,
95	  especially for certain kinds of sensor chips.
96
97	  If you do build this module, be sure to read the notes and warnings
98	  in <file:Documentation/i2c/i2c-stub>.
99
100	  If you don't know what to do here, definitely say N.
101
102config I2C_DEBUG_CORE
103	bool "I2C Core debugging messages"
104	help
105	  Say Y here if you want the I2C core to produce a bunch of debug
106	  messages to the system log.  Select this if you are having a
107	  problem with I2C support and want to see more of what is going on.
108
109config I2C_DEBUG_ALGO
110	bool "I2C Algorithm debugging messages"
111	help
112	  Say Y here if you want the I2C algorithm drivers to produce a bunch
113	  of debug messages to the system log.  Select this if you are having
114	  a problem with I2C support and want to see more of what is going
115	  on.
116
117config I2C_DEBUG_BUS
118	bool "I2C Bus debugging messages"
119	depends on HAS_IOMEM
120	help
121	  Say Y here if you want the I2C bus drivers to produce a bunch of
122	  debug messages to the system log.  Select this if you are having
123	  a problem with I2C support and want to see more of what is going
124	  on.
125
126endif # I2C
127