omap4 i2c: add support for i2c bus 4

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

arch/arm/include/asm/arch-omap4/cpu.h

@@ -138,6 +138,7 @@ struct watchdog {
 #define I2C_BASE1		(OMAP44XX_L4_PER_BASE + 0x70000)
 #define I2C_BASE2		(OMAP44XX_L4_PER_BASE + 0x72000)
 #define I2C_BASE3		(OMAP44XX_L4_PER_BASE + 0x60000)
+#define I2C_BASE4		(OMAP44XX_L4_PER_BASE + 0x350000)
 
 /* MUSB base */
 #define MUSB_BASE		(OMAP44XX_L4_CORE_BASE + 0xAB000)

arch/arm/include/asm/arch-omap4/i2c.h

@@ -23,7 +23,7 @@
 #ifndef _OMAP4_I2C_H_
 #define _OMAP4_I2C_H_
 
-#define I2C_BUS_MAX	3
+#define I2C_BUS_MAX	4
 #define I2C_DEFAULT_BASE	I2C_BASE1
 
 struct i2c {

drivers/i2c/omap24xx_i2c.c

@@ -442,6 +442,14 @@ int i2c_set_bus_num(unsigned int bus)
 		return -1;
 	}
 
+#if I2C_BUS_MAX == 4
+	if (bus == 3)
+		i2c_base = (struct i2c *)I2C_BASE4;
+	else
+	if (bus == 2)
+		i2c_base = (struct i2c *)I2C_BASE3;
+	else
+#endif
 #if I2C_BUS_MAX == 3
 	if (bus == 2)
 		i2c_base = (struct i2c *)I2C_BASE3;