--- a/drivers/net/stmmac/stmmac_main.c	2022-01-14 11:09:38.965900712 +0300
+++ b/drivers/net/stmmac/stmmac_main.c	2022-01-14 11:48:05.613133817 +0300
@@ -125,6 +125,10 @@
 module_param(debug, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(debug, "Message Level (0: no output, 16: all)");
 
+static int phymode = -1;
+module_param(phymode, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(phymode, "PHY interface mode (0=MII,4=RMII,5=RGMII)");
+
 static int phyaddr = -1;
 module_param(phyaddr, int, S_IRUGO);
 MODULE_PARM_DESC(phyaddr, "Physical device address");
@@ -347,10 +351,21 @@
 	else
 		netif_carrier_off(priv->dev);
 
-	/* Always RGMII mode */
-	newval |= 0x20;
+        switch (priv->phy_interface) {
+        case PHY_INTERFACE_MODE_RGMII:
+        case PHY_INTERFACE_MODE_RGMII_ID:
+        case PHY_INTERFACE_MODE_RGMII_RXID:
+        case PHY_INTERFACE_MODE_RGMII_TXID:
+          newval |= 0x20;
+          break;
+        case PHY_INTERFACE_MODE_RMII:
+          newval |= 0x80;
+          break;
+        default:
+          break;
+        }
 
-	/* Shift left for GMAC1 */
+        /* Shift left for GMAC1 */
 	newval <<= shift;
 
 	newval |= oldval & ~(mask << shift);
@@ -2235,6 +2250,9 @@
 
 	/* Override with kernel parameters if supplied XXX CRS XXX
 	 * this needs to have multiple instances */
+	if (phymode >= 0)
+		plat_dat->interface = phymode;
+
 	if ((phyaddr >= 0) && (phyaddr <= 31))
 		plat_dat->phy_addr = phyaddr;