i2c: add support for HiSilicon I2C controller

Add HiSilicon I2C controller driver for the Kunpeng SoC. It provides
the access to the i2c busses, which connects to the eeprom, rtc, etc.

The driver works with IRQ mode, and supports basic I2C features and 10bit
address. The DMA is not supported.

Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Yicong Yang <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

Author: Yicong Yang

MAINTAINERS

@@ -8044,6 +8044,13 @@ F:	drivers/crypto/hisilicon/hpre/hpre.h
 F:	drivers/crypto/hisilicon/hpre/hpre_crypto.c
 F:	drivers/crypto/hisilicon/hpre/hpre_main.c
 
+HISILICON I2C CONTROLLER DRIVER
+M:	Yicong Yang <[email protected]>
+L:	[email protected]
+S:	Maintained
+W:	https://www.hisilicon.com
+F:	drivers/i2c/busses/i2c-hisi.c
+
 HISILICON LPC BUS DRIVER
 M:	[email protected]
 S:	Maintained

drivers/i2c/busses/Kconfig

@@ -645,6 +645,16 @@ config I2C_HIGHLANDER
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-highlander.
 
+config I2C_HISI
+	tristate "HiSilicon I2C controller"
+	depends on ARM64 || COMPILE_TEST
+	help
+	  Say Y here if you want to have Hisilicon I2C controller support
+	  available on the Kunpeng Server.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called i2c-hisi.
+
 config I2C_IBM_IIC
 	tristate "IBM PPC 4xx on-chip I2C interface"
 	depends on 4xx

drivers/i2c/busses/Makefile

@@ -63,6 +63,7 @@ obj-$(CONFIG_I2C_EMEV2)		+= i2c-emev2.o
 obj-$(CONFIG_I2C_EXYNOS5)	+= i2c-exynos5.o
 obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o
 obj-$(CONFIG_I2C_HIGHLANDER)	+= i2c-highlander.o
+obj-$(CONFIG_I2C_HISI)		+= i2c-hisi.o
 obj-$(CONFIG_I2C_HIX5HD2)	+= i2c-hix5hd2.o
 obj-$(CONFIG_I2C_IBM_IIC)	+= i2c-ibm_iic.o
 obj-$(CONFIG_I2C_IMG)		+= i2c-img-scb.o