diff --git a/target/linux/ramips/patches-5.4/991-at803x.patch b/target/linux/ramips/patches-5.4/991-at803x.patch
new file mode 100644
index 0000000000..60afe2a35f
--- /dev/null
+++ b/target/linux/ramips/patches-5.4/991-at803x.patch
@@ -0,0 +1,141 @@
+From 60ae82b0ea56c279be384b99cd2a42ae5ba7c5c7 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Ren=C3=A9=20van=20Dorst?= <opensource@vdorst.com>
+Date: Mon, 4 Nov 2019 22:22:17 +0100
+Subject: [PATCH] net: phy: at803x: add support for SFP module in
+ RGMII-to-x-base mode
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Signed-off-by: René van Dorst <opensource@vdorst.com>
+---
+ drivers/net/phy/at803x.c | 74 ++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 74 insertions(+)
+
+diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
+index 481cf48c9b9e4..a6536ecf15db4 100644
+--- a/drivers/net/phy/at803x.c
++++ b/drivers/net/phy/at803x.c
+@@ -19,6 +19,7 @@
+ #include <linux/etherdevice.h>
+ #include <linux/of_gpio.h>
+ #include <linux/gpio/consumer.h>
++#include <linux/sfp.h>
+ 
+ #define AT803X_SPECIFIC_STATUS			0x11
+ #define AT803X_SS_SPEED_MASK			(3 << 14)
+@@ -57,9 +58,18 @@
+ 
+ #define AT803X_MODE_CFG_MASK			0x0F
+ #define AT803X_MODE_CFG_SGMII			0x01
++#define AT803X_MODE_CFG_BX1000_RGMII_50		0x02
++#define AT803X_MODE_CFG_BX1000_RGMII_75		0x03
++#define AT803X_MODE_FIBER			0x01
++#define AT803X_MODE_COPPER			0x00
+ 
+ #define AT803X_PSSR			0x11	/*PHY-Specific Status Register*/
+ #define AT803X_PSSR_MR_AN_COMPLETE	0x0200
++#define	 PSSR_LINK			BIT(10)
++#define	 PSSR_SYNC_STATUS		BIT(8)
++#define	 PSSR_DUPLEX			BIT(13)
++#define	 PSSR_SPEED_1000		BIT(15)
++#define	 PSSR_SPEED_100			BIT(14)
+ 
+ #define AT803X_DEBUG_REG_0			0x00
+ #define AT803X_DEBUG_RX_CLK_DLY_EN		BIT(15)
+@@ -475,10 +485,56 @@ static int at803x_parse_dt(struct phy_device *phydev)
+ 	return 0;
+ }
+ 
++static int at803x_mode(struct phy_device *phydev)
++{
++	int mode;
++
++	mode = phy_read(phydev, AT803X_REG_CHIP_CONFIG) & AT803X_MODE_CFG_MASK;
++
++	if (mode == AT803X_MODE_CFG_BX1000_RGMII_50 ||
++	    mode == AT803X_MODE_CFG_BX1000_RGMII_75)
++		return AT803X_MODE_FIBER;
++	return AT803X_MODE_COPPER;
++}
++
++static int at803x_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
++{
++	struct phy_device *phydev = upstream;
++	__ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
++	phy_interface_t iface;
++
++	sfp_parse_support(phydev->sfp_bus, id, support);
++	iface = sfp_select_interface(phydev->sfp_bus, support);
++
++	if (iface != PHY_INTERFACE_MODE_SGMII &&
++	    iface != PHY_INTERFACE_MODE_1000BASEX) {
++		dev_info(&phydev->mdio.dev, "incompatible SFP module inserted;"
++			 "Only SGMII/1000BASEX are supported!\n");
++		return -EINVAL;
++	}
++
++	dev_info(&phydev->mdio.dev, "SFP interface %s", phy_modes(iface));
++
++	return 0;
++}
++
++static const struct sfp_upstream_ops at803x_sfp_ops = {
++	.attach = phy_sfp_attach,
++	.detach = phy_sfp_detach,
++	.module_insert = at803x_sfp_insert,
++};
++
+ static int at803x_probe(struct phy_device *phydev)
+ {
+ 	struct device *dev = &phydev->mdio.dev;
+ 	struct at803x_priv *priv;
++	int ret;
++
++	if (at803x_mode(phydev) == AT803X_MODE_FIBER) {
++		ret = phy_sfp_probe(phydev, &at803x_sfp_ops);
++		if (ret < 0)
++			return ret;
++	}
+ 
+ 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ 	if (!priv)
+@@ -658,6 +714,10 @@ static int at803x_read_status(struct phy_device *phydev)
+ {
+ 	int ss, err, old_link = phydev->link;
+ 
++	/* Handle (Fiber) SGMII to RGMII mode */
++	if (at803x_mode(phydev) == AT803X_MODE_FIBER)
++		return genphy_c37_read_status(phydev);
++
+ 	/* Update the link, but return if there was an error */
+ 	err = genphy_update_link(phydev);
+ 	if (err)
+@@ -712,6 +772,19 @@ static int at803x_read_status(struct phy_device *phydev)
+ 	return 0;
+ }
+ 
++static int at803x_config_aneg(struct phy_device *phydev)
++{
++	/* Handle (Fiber) SerDes to RGMII mode */
++	if (at803x_mode(phydev) == AT803X_MODE_FIBER) {
++		pr_warn("%s: fiber\n", __func__);
++		return genphy_c37_config_aneg(phydev);
++	}
++
++	pr_warn("%s: enter\n", __func__);
++
++	return genphy_config_aneg(phydev);
++}
++
+ static struct phy_driver at803x_driver[] = {
+ {
+ 	/* Qualcomm Atheros AR8035 */
+@@ -758,6 +831,7 @@ static struct phy_driver at803x_driver[] = {
+ 	.suspend		= at803x_suspend,
+ 	.resume			= at803x_resume,
+ 	/* PHY_GBIT_FEATURES */
++	.config_aneg		= at803x_config_aneg,
+ 	.read_status		= at803x_read_status,
+ 	.aneg_done		= at803x_aneg_done,
+ 	.ack_interrupt		= &at803x_ack_interrupt,