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1# SPDX-License-Identifier: GPL-2.0-only2#3# I2C subsystem configuration4#5 6menu "I2C support"7 8config I2C9 tristate "I2C support"10 select RT_MUTEXES11 select IRQ_DOMAIN12 help13 I2C (pronounce: I-squared-C) is a slow serial bus protocol used in14 many micro controller applications and developed by Philips. SMBus,15 or System Management Bus is a subset of the I2C protocol. More16 information is contained in the directory <file:Documentation/i2c/>,17 especially in the file called "summary" there.18 19 Both I2C and SMBus are supported here. You will need this for20 hardware sensors support, and also for Video For Linux support.21 22 If you want I2C support, you should say Y here and also to the23 specific driver for your bus adapter(s) below.24 25 This I2C support can also be built as a module. If so, the module26 will be called i2c-core.27 28config ACPI_I2C_OPREGION29 bool "ACPI I2C Operation region support"30 depends on I2C=y && ACPI31 default y32 help33 Say Y here if you want to enable ACPI I2C operation region support.34 Operation Regions allow firmware (BIOS) code to access I2C slave devices,35 such as smart batteries through an I2C host controller driver.36 37if I2C38 39config I2C_BOARDINFO40 bool41 default y42 43config I2C_CHARDEV44 tristate "I2C device interface"45 help46 Say Y here to use i2c-* device files, usually found in the /dev47 directory on your system. They make it possible to have user-space48 programs use the I2C bus. Information on how to do this is49 contained in the file <file:Documentation/i2c/dev-interface.rst>.50 51 This support is also available as a module. If so, the module 52 will be called i2c-dev.53 54config I2C_MUX55 tristate "I2C bus multiplexing support"56 help57 Say Y here if you want the I2C core to support the ability to58 handle multiplexed I2C bus topologies, by presenting each59 multiplexed segment as a I2C adapter.60 61 This support is also available as a module. If so, the module62 will be called i2c-mux.63 64source "drivers/i2c/muxes/Kconfig"65 66config I2C_ATR67 tristate "I2C Address Translator (ATR) support" if COMPILE_TEST68 help69 Enable support for I2C Address Translator (ATR) chips.70 71 An ATR allows accessing multiple I2C busses from a single72 physical bus via address translation instead of bus selection as73 i2c-muxes do.74 75config I2C_HELPER_AUTO76 bool "Autoselect pertinent helper modules"77 default y78 help79 Some I2C bus drivers require so-called "I2C algorithm" modules80 to work. These are basically software-only abstractions of generic81 I2C interfaces. This option will autoselect them so that you don't82 have to care.83 84 Unselect this only if you need to enable additional helper85 modules, for example for use with external I2C bus drivers.86 87 In doubt, say Y.88 89config I2C_SMBUS90 tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO91 help92 Say Y here if you want support for SMBus extensions to the I2C93 specification. At the moment, two extensions are supported:94 the SMBus Alert protocol and the SMBus Host Notify protocol.95 96 This support is also available as a module. If so, the module97 will be called i2c-smbus.98 99source "drivers/i2c/algos/Kconfig"100source "drivers/i2c/busses/Kconfig"101 102config I2C_STUB103 tristate "I2C/SMBus Test Stub"104 depends on m105 help106 This module may be useful to developers of SMBus client drivers,107 especially for certain kinds of sensor chips.108 109 If you do build this module, be sure to read the notes and warnings110 in <file:Documentation/i2c/i2c-stub.rst>.111 112 If you don't know what to do here, definitely say N.113 114config I2C_SLAVE115 bool "I2C slave support"116 help117 This enables Linux to act as an I2C slave device. Note that your I2C118 bus master driver also needs to support this functionality. Please119 read Documentation/i2c/slave-interface.rst for further details.120 121if I2C_SLAVE122 123config I2C_SLAVE_EEPROM124 tristate "I2C eeprom slave driver"125 help126 This backend makes Linux behave like an I2C EEPROM. Please read127 Documentation/i2c/slave-eeprom-backend.rst for further details.128 129config I2C_SLAVE_TESTUNIT130 tristate "I2C testunit driver"131 help132 This backend can be used to trigger test cases for I2C bus masters133 which require a remote device with certain capabilities, e.g.134 multi-master, SMBus Host Notify, etc. Please read135 Documentation/i2c/slave-testunit-backend.rst for further details.136 137endif138 139config I2C_DEBUG_CORE140 bool "I2C Core debugging messages"141 help142 Say Y here if you want the I2C core to produce a bunch of debug143 messages to the system log. Select this if you are having a144 problem with I2C support and want to see more of what is going on.145 146config I2C_DEBUG_ALGO147 bool "I2C Algorithm debugging messages"148 help149 Say Y here if you want the I2C algorithm drivers to produce a bunch150 of debug messages to the system log. Select this if you are having151 a problem with I2C support and want to see more of what is going152 on.153 154config I2C_DEBUG_BUS155 bool "I2C Bus debugging messages"156 depends on HAS_IOMEM157 help158 Say Y here if you want the I2C bus drivers to produce a bunch of159 debug messages to the system log. Select this if you are having160 a problem with I2C support and want to see more of what is going161 on.162 163endif # I2C164 165endmenu166