net: phy: realtek: add rx delay support for RTL8211F

Add RX delay enable support for RTL8211F PHY.

Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

drivers/net/phy/realtek.c

@@ -49,6 +49,7 @@
 
 #define MIIM_RTL8211F_PAGE_SELECT      0x1f
 #define MIIM_RTL8211F_TX_DELAY		0x100
+#define MIIM_RTL8211F_RX_DELAY		0x8
 #define MIIM_RTL8211F_LCR		0x10
 
 static int rtl8211b_probe(struct phy_device *phydev)
@@ -107,6 +108,16 @@ static int rtl8211f_config(struct phy_device *phydev)
 		reg &= ~MIIM_RTL8211F_TX_DELAY;
 
 	phy_write(phydev, MDIO_DEVAD_NONE, 0x11, reg);
+
+	/* enable RX-delay for rgmii-id and rgmii-rxid, otherwise disable it */
+	reg = phy_read(phydev, MDIO_DEVAD_NONE, 0x15);
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
+		reg |= MIIM_RTL8211F_RX_DELAY;
+	else
+		reg &= ~MIIM_RTL8211F_RX_DELAY;
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x15, reg);
+
 	/* restore to default page 0 */
 	phy_write(phydev, MDIO_DEVAD_NONE,
 		  MIIM_RTL8211F_PAGE_SELECT, 0x0);