mx28evk: Add I2C support

Add I2C support.

Tested by placing a 24LC16 EEPROM into the U50 slot which comes empty from factory.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>

board/freescale/mx28evk/iomux.c

@@ -159,6 +159,9 @@ const iomux_cfg_t iomux_setup[] = {
 	MX28_PAD_SSP2_MISO__SSP2_D0 | MUX_CONFIG_SSP2,
 	MX28_PAD_SSP2_SS0__SSP2_D3 |
 		(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP),
+	/* I2C */
+	MX28_PAD_I2C0_SCL__I2C0_SCL,
+	MX28_PAD_I2C0_SDA__I2C0_SDA,
 };
 
 #define HW_DRAM_CTL29	(0x74 >> 2)

include/configs/mx28evk.h

@@ -68,6 +68,7 @@
 #define CONFIG_CMD_SPI
 #define CONFIG_CMD_USB
 #define CONFIG_CMD_BOOTZ
+#define CONFIG_CMD_I2C
 
 /*
  * Memory configurations
@@ -188,6 +189,13 @@
 #define	CONFIG_USB_STORAGE
 #endif
 
+/* I2C */
+#ifdef CONFIG_CMD_I2C
+#define CONFIG_I2C_MXS
+#define CONFIG_HARD_I2C
+#define CONFIG_SYS_I2C_SPEED	400000
+#endif
+
 /*
  * SPI
  */