+/* Below macro is for 1528 Byte Frame support, to Allow even with
+ * Redundancy tag
+ */
+#define PRUSS_MII_RT_RX_FRMS_MAX_SUPPORT_EMAC	(VLAN_ETH_FRAME_LEN + \
+							ETH_FCS_LEN + 6)

Is 6 for the redundancy tag? Is the redundancy tag defined somewhere?
Could this 6 be replaced by a #define, which is maybe a sizeof()?

+	dev_info(dev, "TI PRU ethernet driver initialized: %s EMAC mode\n",
+		 (!eth0_node || !eth1_node) ? "single" : "dual");
+

Is that really true? Is it not in dual mode, but only one interface is
in use? I also wounder at the value of spamming the log like this.

	Andrew