ls102xa: qixis: Add CONFIG_QIXIS_I2C_ACCESS macro

Through adding CONFIG_QIXIS_I2C_ACCESS macro,
QIXIS_READ(reg)/QIXIS_WRITE(reg, value) can be used
for both i2c and ifc access to QIXIS FPGA. This is
more convenient for coding.

Signed-off-by: Jason Jin <jason.jin@freescale.com>
Signed-off-by: Alison Wang <alison.wang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

board/freescale/common/qixis.h

@@ -100,8 +100,15 @@ u8 qixis_read_i2c(unsigned int reg);
 void qixis_write_i2c(unsigned int reg, u8 value);
 #endif
 
+#if defined(CONFIG_QIXIS_I2C_ACCESS) && defined(CONFIG_SYS_I2C_FPGA_ADDR)
+#define QIXIS_READ(reg) qixis_read_i2c(offsetof(struct qixis, reg))
+#define QIXIS_WRITE(reg, value) \
+	qixis_write_i2c(offsetof(struct qixis, reg), value)
+#else
 #define QIXIS_READ(reg) qixis_read(offsetof(struct qixis, reg))
 #define QIXIS_WRITE(reg, value) qixis_write(offsetof(struct qixis, reg), value)
+#endif
+
 #ifdef CONFIG_SYS_I2C_FPGA_ADDR
 #define QIXIS_READ_I2C(reg) qixis_read_i2c(offsetof(struct qixis, reg))
 #define QIXIS_WRITE_I2C(reg, value) \