dm: arm: ls1021a: add i2c DM support

This supports i2c DM and enables CONFIG_DM_I2C
for SoC LS1021A

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/ls1021aiot.h b/include/configs/ls1021aiot.h
index 0b2d331..1d218aa 100644
--- a/include/configs/ls1021aiot.h
+++ b/include/configs/ls1021aiot.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright 2016 Freescale Semiconductor, Inc.
+ * Copyright 2019 NXP
  */
 
 #ifndef __CONFIG_H
@@ -97,7 +98,13 @@
  * I2C
  */
 #define CONFIG_CMD_I2C
+
+#ifndef CONFIG_DM_I2C
 #define CONFIG_SYS_I2C
+#else
+#define CONFIG_I2C_SET_DEFAULT_BUS_NUM
+#define CONFIG_I2C_DEFAULT_BUS_NUMBER 0
+#endif
 #define CONFIG_SYS_I2C_MXC
 #define CONFIG_SYS_I2C_MXC_I2C1		/* enable I2C bus 1 */
 #define CONFIG_SYS_I2C_MXC_I2C2		/* enable I2C bus 2 */