diff --git a/drivers/mfd/rockchip-flexbus.c b/drivers/mfd/rockchip-flexbus.c
index 26030f8d347f..14c365446b90 100644
--- a/drivers/mfd/rockchip-flexbus.c
+++ b/drivers/mfd/rockchip-flexbus.c
@@ -95,9 +95,9 @@ static void rk3506_flexbus_grf_config(struct rockchip_flexbus *rkfb, bool slave_
 
 	if (slave_mode) {
 		if ((!cpol && cpha) || (cpol && !cpha))
-			val |= BIT(1);
+			val |= BIT(0);
 	} else {
-		val |= BIT(0);
+		val |= BIT(1);
 	}
 	regmap_write(rkfb->regmap_grf, RK3506_GRF_SOC_CON1, val);
 }
diff --git a/include/linux/mfd/rockchip-flexbus.h b/include/linux/mfd/rockchip-flexbus.h
index 185702a5da41..bf6d10b74158 100644
--- a/include/linux/mfd/rockchip-flexbus.h
+++ b/include/linux/mfd/rockchip-flexbus.h
@@ -81,9 +81,12 @@
 #define FLEXBUS_CPHA			BIT(2)
 
 /* Bit fields in TX_CTL */
+#define FLEXBUS_TX_CTL_UNIT_BYTE	BIT(14)
 #define FLEXBUS_TX_CTL_MSB		BIT(13)
 
 /* Bit fields in RX_CTL */
+#define FLEXBUS_RX_CTL_FILL_DUMMY	BIT(17)
+#define FLEXBUS_RX_CTL_UNIT_BYTE	BIT(16)
 #define FLEXBUS_RX_CTL_MSB		BIT(15)
 #define FLEXBUS_AUTOPAD			BIT(14)
 #define FLEXBUS_RXD_DY			BIT(5)