# SPDX-License-Identifier: GPL-2.0-only## I2C subsystem configuration# menu "I2C support" config I2C	tristate "I2C support"	select RT_MUTEXES	select IRQ_DOMAIN	help	  I2C (pronounce: I-squared-C) is a slow serial bus protocol used in	  many micro controller applications and developed by Philips.  SMBus,	  or System Management Bus is a subset of the I2C protocol.  More	  information is contained in the directory <file:Documentation/i2c/>,	  especially in the file called "summary" there. 	  Both I2C and SMBus are supported here. You will need this for	  hardware sensors support, and also for Video For Linux support. 	  If you want I2C support, you should say Y here and also to the	  specific driver for your bus adapter(s) below. 	  This I2C support can also be built as a module.  If so, the module	  will be called i2c-core. config ACPI_I2C_OPREGION	bool "ACPI I2C Operation region support"	depends on I2C=y && ACPI	default y	help	  Say Y here if you want to enable ACPI I2C operation region support.	  Operation Regions allow firmware (BIOS) code to access I2C slave devices,	  such as smart batteries through an I2C host controller driver. if I2C config I2C_BOARDINFO	bool	default y config I2C_CHARDEV	tristate "I2C device interface"	help	  Say Y here to use i2c-* device files, usually found in the /dev	  directory on your system.  They make it possible to have user-space	  programs use the I2C bus.  Information on how to do this is	  contained in the file <file:Documentation/i2c/dev-interface.rst>. 	  This support is also available as a module.  If so, the module 	  will be called i2c-dev. config I2C_MUX	tristate "I2C bus multiplexing support"	help	  Say Y here if you want the I2C core to support the ability to	  handle multiplexed I2C bus topologies, by presenting each	  multiplexed segment as a I2C adapter. 	  This support is also available as a module.  If so, the module	  will be called i2c-mux. source "drivers/i2c/muxes/Kconfig" config I2C_ATR	tristate "I2C Address Translator (ATR) support" if COMPILE_TEST	help	  Enable support for I2C Address Translator (ATR) chips. 	  An ATR allows accessing multiple I2C busses from a single	  physical bus via address translation instead of bus selection as	  i2c-muxes do. config I2C_HELPER_AUTO	bool "Autoselect pertinent helper modules"	default y	help	  Some I2C bus drivers require so-called "I2C algorithm" modules	  to work. These are basically software-only abstractions of generic	  I2C interfaces. This option will autoselect them so that you don't	  have to care. 	  Unselect this only if you need to enable additional helper	  modules, for example for use with external I2C bus drivers. 	  In doubt, say Y. config I2C_SMBUS	tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO	help	  Say Y here if you want support for SMBus extensions to the I2C	  specification. At the moment, two extensions are supported:	  the SMBus Alert protocol and the SMBus Host Notify protocol. 	  This support is also available as a module.  If so, the module	  will be called i2c-smbus. source "drivers/i2c/algos/Kconfig"source "drivers/i2c/busses/Kconfig" config I2C_STUB	tristate "I2C/SMBus Test Stub"	depends on m	help	  This module may be useful to developers of SMBus client drivers,	  especially for certain kinds of sensor chips. 	  If you do build this module, be sure to read the notes and warnings	  in <file:Documentation/i2c/i2c-stub.rst>. 	  If you don't know what to do here, definitely say N. config I2C_SLAVE	bool "I2C slave support"	help	  This enables Linux to act as an I2C slave device. Note that your I2C	  bus master driver also needs to support this functionality. Please	  read Documentation/i2c/slave-interface.rst for further details. if I2C_SLAVE config I2C_SLAVE_EEPROM	tristate "I2C eeprom slave driver"	help	  This backend makes Linux behave like an I2C EEPROM. Please read	  Documentation/i2c/slave-eeprom-backend.rst for further details. config I2C_SLAVE_TESTUNIT	tristate "I2C testunit driver"	help	  This backend can be used to trigger test cases for I2C bus masters	  which require a remote device with certain capabilities, e.g.	  multi-master, SMBus Host Notify, etc. Please read	  Documentation/i2c/slave-testunit-backend.rst for further details. endif config I2C_DEBUG_CORE	bool "I2C Core debugging messages"	help	  Say Y here if you want the I2C core to produce a bunch of debug	  messages to the system log.  Select this if you are having a	  problem with I2C support and want to see more of what is going on. config I2C_DEBUG_ALGO	bool "I2C Algorithm debugging messages"	help	  Say Y here if you want the I2C algorithm drivers to produce a bunch	  of debug messages to the system log.  Select this if you are having	  a problem with I2C support and want to see more of what is going	  on. config I2C_DEBUG_BUS	bool "I2C Bus debugging messages"	depends on HAS_IOMEM	help	  Say Y here if you want the I2C bus drivers to produce a bunch of	  debug messages to the system log.  Select this if you are having	  a problem with I2C support and want to see more of what is going	  on. endif # I2C endmenu