diff --git a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
index def6b445d4..1a87d0d112 100644
--- a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
+++ b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
@@ -102,6 +102,29 @@
 #define RTL931X_PS_SERDES_OFF_MODE_CTRL_ADDR	(0x13F4)
 #define RTL931X_MAC_SERDES_MODE_CTRL(sds)	(0x136C + (((sds) << 2)))
 
+enum rtpcs_sds_mode {
+	RTPCS_SDS_MODE_OFF = 0,
+
+	/* fiber modes */
+	RTPCS_SDS_MODE_1000BASEX,
+	RTPCS_SDS_MODE_2500BASEX,
+	RTPCS_SDS_MODE_10GBASER,
+
+	/* mii modes */
+	RTPCS_SDS_MODE_SGMII,
+	RTPCS_SDS_MODE_HISGMII,
+	RTPCS_SDS_MODE_QSGMII,
+	RTPCS_SDS_MODE_QHSGMII,
+	RTPCS_SDS_MODE_XSGMII,
+
+	RTPCS_SDS_MODE_USXGMII_10GSXGMII,
+	RTPCS_SDS_MODE_USXGMII_10GDXGMII,
+	RTPCS_SDS_MODE_USXGMII_10GQXGMII,
+	RTPCS_SDS_MODE_USXGMII_5GSXGMII,
+	RTPCS_SDS_MODE_USXGMII_5GDXGMII,
+	RTPCS_SDS_MODE_USXGMII_2_5GSXGMII,
+};
+
 struct rtpcs_ctrl {
 	struct device *dev;
 	struct regmap *map;