v4.19.13 snapshot.
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
new file mode 100644
index 0000000..efc3354
--- /dev/null
+++ b/drivers/i2c/Kconfig
@@ -0,0 +1,149 @@
+#
+# 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_COMPAT
+ bool "Enable compatibility bits for old user-space"
+ default y
+ help
+ Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
+ other user-space package which expects i2c adapters to be class
+ devices. If you don't know, say 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>.
+
+ 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_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
+ default 'n'
+ 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>.
+
+ If you don't know what to do here, definitely say N.
+
+config I2C_SLAVE
+ bool "I2C slave support"
+
+if I2C_SLAVE
+
+config I2C_SLAVE_EEPROM
+ tristate "I2C eeprom slave driver"
+
+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