diff --git a/drivers/net/dwc_eth_qos_stm32.c b/drivers/net/dwc_eth_qos_stm32.c
index d7ec0c9..7545026 100644
--- a/drivers/net/dwc_eth_qos_stm32.c
+++ b/drivers/net/dwc_eth_qos_stm32.c
@@ -26,6 +26,7 @@
 #include <reset.h>
 #include <syscon.h>
 #include <wait_bit.h>
+#include <linux/bitfield.h>
 #include <linux/delay.h>
 
 #include "dwc_eth_qos.h"
@@ -40,9 +41,9 @@
 #define SYSCFG_PMCSETR_ETH_SELMII	BIT(20)
 
 #define SYSCFG_PMCSETR_ETH_SEL_MASK	GENMASK(23, 21)
-#define SYSCFG_PMCSETR_ETH_SEL_GMII_MII	0
-#define SYSCFG_PMCSETR_ETH_SEL_RGMII	BIT(21)
-#define SYSCFG_PMCSETR_ETH_SEL_RMII	BIT(23)
+#define SYSCFG_PMCSETR_ETH_SEL_GMII_MII	0x0
+#define SYSCFG_PMCSETR_ETH_SEL_RGMII	0x1
+#define SYSCFG_PMCSETR_ETH_SEL_RMII	0x4
 
 static ulong eqos_get_tick_clk_rate_stm32(struct udevice *dev)
 {
@@ -142,35 +143,33 @@
 
 	switch (interface_type) {
 	case PHY_INTERFACE_MODE_MII:
-		value = SYSCFG_PMCSETR_ETH_SEL_GMII_MII |
-			SYSCFG_PMCSETR_ETH_REF_CLK_SEL;
+		value = FIELD_PREP(SYSCFG_PMCSETR_ETH_SEL_MASK,
+				   SYSCFG_PMCSETR_ETH_SEL_GMII_MII);
+		value |= SYSCFG_PMCSETR_ETH_REF_CLK_SEL;
 		log_debug("PHY_INTERFACE_MODE_MII\n");
 		break;
 	case PHY_INTERFACE_MODE_GMII:
+		value = FIELD_PREP(SYSCFG_PMCSETR_ETH_SEL_MASK,
+				   SYSCFG_PMCSETR_ETH_SEL_GMII_MII);
 		if (eth_clk_sel_reg)
-			value = SYSCFG_PMCSETR_ETH_SEL_GMII_MII |
-				SYSCFG_PMCSETR_ETH_CLK_SEL;
-		else
-			value = SYSCFG_PMCSETR_ETH_SEL_GMII_MII;
+			value |= SYSCFG_PMCSETR_ETH_CLK_SEL;
 		log_debug("PHY_INTERFACE_MODE_GMII\n");
 		break;
 	case PHY_INTERFACE_MODE_RMII:
+		value = FIELD_PREP(SYSCFG_PMCSETR_ETH_SEL_MASK,
+				   SYSCFG_PMCSETR_ETH_SEL_RMII);
 		if (eth_ref_clk_sel_reg)
-			value = SYSCFG_PMCSETR_ETH_SEL_RMII |
-				SYSCFG_PMCSETR_ETH_REF_CLK_SEL;
-		else
-			value = SYSCFG_PMCSETR_ETH_SEL_RMII;
+			value |= SYSCFG_PMCSETR_ETH_REF_CLK_SEL;
 		log_debug("PHY_INTERFACE_MODE_RMII\n");
 		break;
 	case PHY_INTERFACE_MODE_RGMII:
 	case PHY_INTERFACE_MODE_RGMII_ID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
+		value = FIELD_PREP(SYSCFG_PMCSETR_ETH_SEL_MASK,
+				   SYSCFG_PMCSETR_ETH_SEL_RGMII);
 		if (eth_clk_sel_reg)
-			value = SYSCFG_PMCSETR_ETH_SEL_RGMII |
-				SYSCFG_PMCSETR_ETH_CLK_SEL;
-		else
-			value = SYSCFG_PMCSETR_ETH_SEL_RGMII;
+			value |= SYSCFG_PMCSETR_ETH_CLK_SEL;
 		log_debug("PHY_INTERFACE_MODE_RGMII\n");
 		break;
 	default: