i2c: imc: Add support for Intel iMC SMBus host controller.

Modern Intel memory controllers have an SMBus connection to DIMMs and their
eeproms and thermal sensors.

Initially support Broadwell memory controllers and DIMM thermal sensors,
only.

Automatically expose the thermal sensors.

Signed-off-by: Stefan Schaeckeler <sschaeck@cisco.com>

MAINTAINERS

@@ -7895,6 +7895,11 @@ F:	drivers/i2c/busses/i2c-sis96x.c
 F:	drivers/i2c/busses/i2c-via.c
 F:	drivers/i2c/busses/i2c-viapro.c
 
+I2C/SMBUS IMC DRIVER
+M:	Stefan Schaeckeler <sschaeck@cisco.com>
+L:	linux-i2c@vger.kernel.org
+F:	drivers/i2c/busses/i2c-imc.c
+
 I2C/SMBUS INTEL CHT WHISKEY COVE PMIC DRIVER
 M:	Hans de Goede <hdegoede@redhat.com>
 L:	linux-i2c@vger.kernel.org

drivers/i2c/busses/Kconfig

@@ -150,6 +150,21 @@ config I2C_I801
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-i801.
 
+config I2C_IMC
+	tristate "Intel iMC SMBus Controller"
+	depends on PCI && X86 && SENSORS_JC42
+	help
+	  If you say yes to this option, support will be included for the Intel
+	  iMC SMBus host controller.
+
+	  Currently, there is support for Broadwell, only.
+
+	  Behind the iMC SMBus are DIMMs with eeproms and temperature sensors.
+	  This driver is also instantiating the temperature sensors.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called i2c-imc.
+
 config I2C_ISCH
 	tristate "Intel SCH SMBus 1.0"
 	depends on PCI

drivers/i2c/busses/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_I2C_AMD756_S4882)	+= i2c-amd756-s4882.o
 obj-$(CONFIG_I2C_AMD8111)	+= i2c-amd8111.o
 obj-$(CONFIG_I2C_CHT_WC)	+= i2c-cht-wc.o
 obj-$(CONFIG_I2C_I801)		+= i2c-i801.o
+obj-$(CONFIG_I2C_IMC)		+= i2c-imc.o
 obj-$(CONFIG_I2C_ISCH)		+= i2c-isch.o
 obj-$(CONFIG_I2C_ISMT)		+= i2c-ismt.o
 obj-$(CONFIG_I2C_NFORCE2)	+= i2c-nforce2.o