net: fec: add more macros for bits of FEC_ECR

There are also some RCR bits that are not defined but are used by the
driver, so add macro definitions for these bits to improve readability
and maintainability.

In addition, although FEC_RCR_HALFDPX has been defined, it is not used
in the driver. According to the description of FEC_RCR[1] in RM, it is
used to disable receive on transmit. Therefore, it is more appropriate
to redefine FEC_RCR[1] as FEC_RCR_DRT.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20250711091639.1374411-3-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Wei Fang

drivers/net/ethernet/freescale/fec_main.c

@@ -279,13 +279,15 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
 #define FEC_ECR_BYTESWP         BIT(8)
 /* FEC RCR bits definition */
 #define FEC_RCR_LOOP            BIT(0)
-#define FEC_RCR_HALFDPX         BIT(1)
+#define FEC_RCR_DRT		BIT(1)
 #define FEC_RCR_MII             BIT(2)
 #define FEC_RCR_PROMISC         BIT(3)
 #define FEC_RCR_BC_REJ          BIT(4)
 #define FEC_RCR_FLOWCTL         BIT(5)
+#define FEC_RCR_RGMII		BIT(6)
 #define FEC_RCR_RMII            BIT(8)
 #define FEC_RCR_10BASET         BIT(9)
+#define FEC_RCR_NLC		BIT(30)
 /* TX WMARK bits */
 #define FEC_TXWMRK_STRFWD       BIT(8)
 
@@ -1131,7 +1133,7 @@ fec_restart(struct net_device *ndev)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
 	u32 temp_mac[2];
-	u32 rcntl = OPT_FRAME_SIZE | 0x04;
+	u32 rcntl = OPT_FRAME_SIZE | FEC_RCR_MII;
 	u32 ecntl = FEC_ECR_ETHEREN;
 
 	if (fep->bufdesc_ex)
@@ -1162,7 +1164,7 @@ fec_restart(struct net_device *ndev)
 		writel(0x04, fep->hwp + FEC_X_CNTRL);
 	} else {
 		/* No Rcv on Xmit */
-		rcntl |= 0x02;
+		rcntl |= FEC_RCR_DRT;
 		writel(0x0, fep->hwp + FEC_X_CNTRL);
 	}
 
@@ -1191,11 +1193,11 @@ fec_restart(struct net_device *ndev)
 	 */
 	if (fep->quirks & FEC_QUIRK_ENET_MAC) {
 		/* Enable flow control and length check */
-		rcntl |= 0x40000000 | 0x00000020;
+		rcntl |= FEC_RCR_NLC | FEC_RCR_FLOWCTL;
 
 		/* RGMII, RMII or MII */
 		if (phy_interface_mode_is_rgmii(fep->phy_interface))
-			rcntl |= (1 << 6);
+			rcntl |= FEC_RCR_RGMII;
 		else if (fep->phy_interface == PHY_INTERFACE_MODE_RMII)
 			rcntl |= FEC_RCR_RMII;
 		else