diff --git a/README b/README
index b0124d6..29b7010 100644
--- a/README
+++ b/README
@@ -2375,6 +2375,8 @@ CBFS (Coreboot Filesystem) support
 		  - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
 		If those defines are not set, default value is 100000
 		for speed, and 0 for slave.
+		  - enable bus 3 with CONFIG_SYS_I2C_MXC_I2C3
+		  - enable bus 4 with CONFIG_SYS_I2C_MXC_I2C4
 
 		- drivers/i2c/rcar_i2c.c:
 		  - activate this driver with CONFIG_SYS_I2C_RCAR
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index fc5ee35..42782cb 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -114,6 +114,9 @@ static u16 i2c_clk_div[50][2] = {
 #ifndef CONFIG_SYS_MXC_I2C3_SPEED
 #define CONFIG_SYS_MXC_I2C3_SPEED 100000
 #endif
+#ifndef CONFIG_SYS_MXC_I2C4_SPEED
+#define CONFIG_SYS_MXC_I2C4_SPEED 100000
+#endif
 
 #ifndef CONFIG_SYS_MXC_I2C1_SLAVE
 #define CONFIG_SYS_MXC_I2C1_SLAVE 0
@@ -124,6 +127,9 @@ static u16 i2c_clk_div[50][2] = {
 #ifndef CONFIG_SYS_MXC_I2C3_SLAVE
 #define CONFIG_SYS_MXC_I2C3_SLAVE 0
 #endif
+#ifndef CONFIG_SYS_MXC_I2C4_SLAVE
+#define CONFIG_SYS_MXC_I2C4_SLAVE 0
+#endif
 
 
 /*
@@ -543,12 +549,17 @@ U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe,
 			 mxc_i2c_set_bus_speed,
 			 CONFIG_SYS_MXC_I2C2_SPEED,
 			 CONFIG_SYS_MXC_I2C2_SLAVE, 1)
-#if defined(CONFIG_MX31) || defined(CONFIG_MX35) ||\
-	defined(CONFIG_MX51) || defined(CONFIG_MX53) ||\
-	defined(CONFIG_MX6) || defined(CONFIG_LS102XA)
+#ifdef CONFIG_SYS_I2C_MXC_I2C3
 U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe,
 			 mxc_i2c_read, mxc_i2c_write,
 			 mxc_i2c_set_bus_speed,
 			 CONFIG_SYS_MXC_I2C3_SPEED,
 			 CONFIG_SYS_MXC_I2C3_SLAVE, 2)
 #endif
+#ifdef CONFIG_SYS_I2C_MXC_I2C4
+U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe,
+			 mxc_i2c_read, mxc_i2c_write,
+			 mxc_i2c_set_bus_speed,
+			 CONFIG_SYS_MXC_I2C4_SPEED,
+			 CONFIG_SYS_MXC_I2C4_SLAVE, 3)
+#endif
diff --git a/include/configs/aristainetos.h b/include/configs/aristainetos.h
index 3066fd0..cc26790 100644
--- a/include/configs/aristainetos.h
+++ b/include/configs/aristainetos.h
@@ -262,6 +262,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_SYS_I2C_SLAVE		0x7f
 #define CONFIG_SYS_I2C_NOPROBES		{ {0, 0x00} }
diff --git a/include/configs/cm_fx6.h b/include/configs/cm_fx6.h
index 4207504..d6e5a2b 100644
--- a/include/configs/cm_fx6.h
+++ b/include/configs/cm_fx6.h
@@ -245,6 +245,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_SYS_MXC_I2C3_SPEED	400000
 
diff --git a/include/configs/embestmx6boards.h b/include/configs/embestmx6boards.h
index b4b3ae8..e9f5bed 100644
--- a/include/configs/embestmx6boards.h
+++ b/include/configs/embestmx6boards.h
@@ -55,6 +55,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 
 /* USB Configs */
diff --git a/include/configs/flea3.h b/include/configs/flea3.h
index 854ae90..5f7cad8 100644
--- a/include/configs/flea3.h
+++ b/include/configs/flea3.h
@@ -52,6 +52,7 @@
  */
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_SPD_BUS_NUM		2 /* I2C3 */
 #define CONFIG_SYS_MXC_I2C3_SLAVE	0xfe
 #define CONFIG_MXC_SPI
diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h
index 620f950..9bc3250 100644
--- a/include/configs/gw_ventana.h
+++ b/include/configs/gw_ventana.h
@@ -95,6 +95,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_I2C_GSC			0
 #define CONFIG_I2C_PMIC			1
diff --git a/include/configs/imx31_phycore.h b/include/configs/imx31_phycore.h
index 49039d6..db197f3 100644
--- a/include/configs/imx31_phycore.h
+++ b/include/configs/imx31_phycore.h
@@ -38,6 +38,7 @@
 
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_CLK_OFFSET	I2C2_CLK_OFFSET
 
 #define CONFIG_MXC_UART
diff --git a/include/configs/ls1021aqds.h b/include/configs/ls1021aqds.h
index 3dc4da3..56aa336 100644
--- a/include/configs/ls1021aqds.h
+++ b/include/configs/ls1021aqds.h
@@ -390,6 +390,7 @@ unsigned long get_board_ddr_clk(void);
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 
 /*
  * I2C bus multiplexer
diff --git a/include/configs/ls1021atwr.h b/include/configs/ls1021atwr.h
index a13876b..729205f 100644
--- a/include/configs/ls1021atwr.h
+++ b/include/configs/ls1021atwr.h
@@ -205,6 +205,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 
 /* EEPROM */
 #ifndef CONFIG_SD_BOOT
diff --git a/include/configs/ls2085a_common.h b/include/configs/ls2085a_common.h
index eb7b9b2..1f1eddb 100644
--- a/include/configs/ls2085a_common.h
+++ b/include/configs/ls2085a_common.h
@@ -84,6 +84,8 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
+#define CONFIG_SYS_I2C_MXC_I2C4		/* enable I2C bus 4 */
 #define CONFIG_SYS_MXC_I2C1_SPEED	40000000
 #define CONFIG_SYS_MXC_I2C2_SPEED	40000000
 
diff --git a/include/configs/m53evk.h b/include/configs/m53evk.h
index c133ba9..c348d38 100644
--- a/include/configs/m53evk.h
+++ b/include/configs/m53evk.h
@@ -176,6 +176,7 @@
 #ifdef CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_RTC_BUS_NUM		1 /* I2C2 */
 #endif
 
diff --git a/include/configs/mx35pdk.h b/include/configs/mx35pdk.h
index 857dd07..71d56cc 100644
--- a/include/configs/mx35pdk.h
+++ b/include/configs/mx35pdk.h
@@ -42,6 +42,7 @@
  */
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_MXC_SPI
 #define CONFIG_MXC_GPIO
 
diff --git a/include/configs/mx53ard.h b/include/configs/mx53ard.h
index 134d680..d443813 100644
--- a/include/configs/mx53ard.h
+++ b/include/configs/mx53ard.h
@@ -48,6 +48,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 
 /* MMC Configs */
 #define CONFIG_FSL_ESDHC
diff --git a/include/configs/mx53evk.h b/include/configs/mx53evk.h
index fb2072d..22a9fc4 100644
--- a/include/configs/mx53evk.h
+++ b/include/configs/mx53evk.h
@@ -41,6 +41,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 
 /* PMIC Configs */
 #define CONFIG_POWER
diff --git a/include/configs/mx53loco.h b/include/configs/mx53loco.h
index 8d8b93c..bf806c1 100644
--- a/include/configs/mx53loco.h
+++ b/include/configs/mx53loco.h
@@ -78,6 +78,7 @@
 /* I2C Configs */
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 
 /* PMIC Controller */
 #define CONFIG_POWER
diff --git a/include/configs/mx53smd.h b/include/configs/mx53smd.h
index 3da0ef4..0785491 100644
--- a/include/configs/mx53smd.h
+++ b/include/configs/mx53smd.h
@@ -38,6 +38,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 
 /* MMC Configs */
 #define CONFIG_FSL_ESDHC
diff --git a/include/configs/mx6qsabreauto.h b/include/configs/mx6qsabreauto.h
index 51042ca..2260344 100644
--- a/include/configs/mx6qsabreauto.h
+++ b/include/configs/mx6qsabreauto.h
@@ -56,6 +56,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 
 /* NAND flash command */
diff --git a/include/configs/mx6sabresd.h b/include/configs/mx6sabresd.h
index 99d9d4d..dab2fd2 100644
--- a/include/configs/mx6sabresd.h
+++ b/include/configs/mx6sabresd.h
@@ -52,6 +52,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		  100000
 
 /* PMIC */
diff --git a/include/configs/mx6slevk.h b/include/configs/mx6slevk.h
index 1221418..2245d13 100644
--- a/include/configs/mx6slevk.h
+++ b/include/configs/mx6slevk.h
@@ -52,6 +52,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		  100000
 
 /* PMIC */
diff --git a/include/configs/mx6sxsabresd.h b/include/configs/mx6sxsabresd.h
index a290129..247697e 100644
--- a/include/configs/mx6sxsabresd.h
+++ b/include/configs/mx6sxsabresd.h
@@ -178,6 +178,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		  100000
 
 /* PMIC */
diff --git a/include/configs/nitrogen6x.h b/include/configs/nitrogen6x.h
index 6d379ed..80bfb03 100644
--- a/include/configs/nitrogen6x.h
+++ b/include/configs/nitrogen6x.h
@@ -63,6 +63,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_I2C_EDID
 
diff --git a/include/configs/novena.h b/include/configs/novena.h
index 074110c..b5073c6 100644
--- a/include/configs/novena.h
+++ b/include/configs/novena.h
@@ -144,6 +144,7 @@
 /* I2C */
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_I2C_MULTI_BUS
 #define CONFIG_I2C_MXC
 #define CONFIG_SYS_I2C_SPEED		100000
diff --git a/include/configs/ot1200.h b/include/configs/ot1200.h
index 3c60b4f..200f40a 100644
--- a/include/configs/ot1200.h
+++ b/include/configs/ot1200.h
@@ -62,6 +62,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED            100000
 
 /* OCOTP Configs */
diff --git a/include/configs/platinum.h b/include/configs/platinum.h
index 134bb45..91ffc7c 100644
--- a/include/configs/platinum.h
+++ b/include/configs/platinum.h
@@ -62,6 +62,7 @@
 /* I2C config */
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED			100000
 
 /* MMC config */
diff --git a/include/configs/tbs2910.h b/include/configs/tbs2910.h
index 7089378..3a88f22 100644
--- a/include/configs/tbs2910.h
+++ b/include/configs/tbs2910.h
@@ -199,6 +199,7 @@
 #ifdef CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_I2C_EDID
 #endif
diff --git a/include/configs/titanium.h b/include/configs/titanium.h
index f9e00c5..320d76c 100644
--- a/include/configs/titanium.h
+++ b/include/configs/titanium.h
@@ -44,6 +44,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 
 /* MMC Configs */
diff --git a/include/configs/tqma6.h b/include/configs/tqma6.h
index a099687..99c5f82 100644
--- a/include/configs/tqma6.h
+++ b/include/configs/tqma6.h
@@ -80,6 +80,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_I2C_MULTI_BUS
 #define CONFIG_SYS_I2C_SPEED		100000
 
diff --git a/include/configs/wandboard.h b/include/configs/wandboard.h
index 117d1f7..bdd16d9 100644
--- a/include/configs/wandboard.h
+++ b/include/configs/wandboard.h
@@ -62,6 +62,7 @@
 #define CONFIG_CMD_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
 
 /* MMC Configuration */
diff --git a/include/configs/woodburn_common.h b/include/configs/woodburn_common.h
index 48b8692..d0895cf 100644
--- a/include/configs/woodburn_common.h
+++ b/include/configs/woodburn_common.h
@@ -47,6 +47,7 @@
  */
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_SPD_BUS_NUM		0
 #define CONFIG_MXC_SPI
 #define CONFIG_MXC_GPIO
