fman_port_get_tstamp
if (!fman_port_get_tstamp(priv->mac_dev->port[TX], vaddr,
if (!fman_port_get_tstamp(priv->mac_dev->port[RX], vaddr, &ns))
EXPORT_SYMBOL(fman_port_get_tstamp);
int fman_port_get_tstamp(struct fman_port *port, const void *data, u64 *tstamp);