i2c: Blackfin Two Wire Interface driver

The i2c linux driver for blackfin architecture which supports blackfin
on-chip TWI controller i2c operation.
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

MAINTAINERS

@@ -733,6 +733,13 @@ M:	tigran@aivazian.fsnet.co.uk
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 
+BLACKFIN I2C TWI DRIVER
+P:	Sonic Zhang
+M:	sonic.zhang@analog.com
+L:	uclinux-dist-devel@blackfin.uclinux.org (subscribers-only)
+W:	http://blackfin.uclinux.org/
+S:	Supported
+
 BLOCK LAYER
 P:	Jens Axboe
 M:	axboe@kernel.dk

drivers/i2c/busses/Kconfig

@@ -91,6 +91,22 @@ config I2C_AU1550
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-au1550.
 
+config I2C_BLACKFIN_TWI
+	tristate "Blackfin TWI I2C support"
+	depends on I2C && (BF534 || BF536 || BF537)
+	help
+	  This is the TWI I2C device driver for Blackfin 534/536/537.
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-bfin-twi.
+
+config I2C_BLACKFIN_TWI_CLK_KHZ
+	int "Blackfin TWI I2C clock (kHz)"
+	depends on I2C_BLACKFIN_TWI
+	range 10 400
+	default 50
+	help
+	  The unit of the TWI clock is kHz.
+
 config I2C_ELEKTOR
 	tristate "Elektor ISA card"
 	depends on I2C && ISA && BROKEN_ON_SMP

drivers/i2c/busses/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_I2C_AMD756_S4882)	+= i2c-amd756-s4882.o
 obj-$(CONFIG_I2C_AMD8111)	+= i2c-amd8111.o
 obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
+obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_ELEKTOR)	+= i2c-elektor.o
 obj-$(CONFIG_I2C_HYDRA)		+= i2c-hydra.o
 obj-$(CONFIG_I2C_I801)		+= i2c-i801.o

include/linux/i2c-id.h

@@ -258,8 +258,9 @@
 /* --- MCP107 adapter */
 #define I2C_HW_MPC107		0x0d0000
 
-/* --- Marvell mv64xxx i2c adapter */
+/* --- Embedded adapters */
 #define I2C_HW_MV64XXX		0x190000
+#define I2C_HW_BLACKFIN		0x190001 /* ADI Blackfin I2C TWI driver */
 
 /* --- Miscellaneous adapters */
 #define I2C_HW_SAA7146		0x060000 /* SAA7146 video decoder bus */