i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller

This bus driver supports the GENI based i2c hardware controller in the
Qualcomm SOCs. The Qualcomm Generic Interface (GENI) is a programmable
module supporting a wide range of serial interfaces including I2C. The
driver supports FIFO mode and DMA mode of transfer and switches modes
dynamically depending on the size of the transfer.

Signed-off-by: Karthikeyan Ramasubramanian <[email protected]>
Signed-off-by: Sagar Dharia <[email protected]>
Signed-off-by: Girish Mahadevan <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
Tested-by: Stephen Boyd <[email protected]>
[wsa: squashed the MAINTAINER addition and a RPM fix by Evan Green]
Signed-off-by: Wolfram Sang <[email protected]>

MAINTAINERS

@@ -11837,6 +11837,14 @@ L:	[email protected]
 S:	Maintained
 F:	drivers/net/ethernet/qualcomm/emac/
 
+QUALCOMM GENERIC INTERFACE I2C DRIVER
+M:	Alok Chauhan <[email protected]>
+M:	Karthikeyan Ramasubramanian <[email protected]>
+L:	[email protected]
+L:	[email protected]
+S:	Supported
+F:	drivers/i2c/busses/i2c-qcom-geni.c
+
 QUALCOMM HEXAGON ARCHITECTURE
 M:	Richard Kuo <[email protected]>
 L:	[email protected]

drivers/i2c/busses/Kconfig

@@ -825,6 +825,19 @@ config I2C_PXA_SLAVE
 	  is necessary for systems where the PXA may be a target on the
 	  I2C bus.
 
+config I2C_QCOM_GENI
+	tristate "Qualcomm Technologies Inc.'s GENI based I2C controller"
+	depends on ARCH_QCOM || COMPILE_TEST
+	depends on QCOM_GENI_SE
+	help
+	  This driver supports GENI serial engine based I2C controller in
+	  master mode on the Qualcomm Technologies Inc.'s SoCs. If you say
+	  yes to this option, support will be included for the built-in I2C
+	  interface on the Qualcomm Technologies Inc.'s SoCs.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-qcom-geni.
+
 config I2C_QUP
 	tristate "Qualcomm QUP based I2C controller"
 	depends on ARCH_QCOM

drivers/i2c/busses/Makefile

@@ -83,6 +83,7 @@ obj-$(CONFIG_I2C_PNX)		+= i2c-pnx.o
 obj-$(CONFIG_I2C_PUV3)		+= i2c-puv3.o
 obj-$(CONFIG_I2C_PXA)		+= i2c-pxa.o
 obj-$(CONFIG_I2C_PXA_PCI)	+= i2c-pxa-pci.o
+obj-$(CONFIG_I2C_QCOM_GENI)	+= i2c-qcom-geni.o
 obj-$(CONFIG_I2C_QUP)		+= i2c-qup.o
 obj-$(CONFIG_I2C_RIIC)		+= i2c-riic.o
 obj-$(CONFIG_I2C_RK3X)		+= i2c-rk3x.o