+- tx-delay: Delay value for RGMII bridge TX clock.
+ Valid values are between 0 to 7, that maps to
+ 417, 717, 1020, 1321, 1611, 1913, 2215, 2514 ps
+ Default value is 4, which corresponds to 1611 ps
+- rx-delay: Delay value for RGMII bridge RX clock.
+ Valid values are between 0 to 7, that maps to
+ 273, 589, 899, 1222, 1480, 1806, 2147, 2464 ps
+ Default value is 2, which corresponds to 899 ps