cpsw_sl_wait_for_idle
cpsw_sl_wait_for_idle(port->slave.mac_sl, 100);
tmo = cpsw_sl_wait_for_idle(port->slave.mac_sl, 100);
cpsw_sl_wait_for_idle(slave->mac_sl, 100);
cpsw_sl_wait_for_idle(slave->mac_sl, 100);
int cpsw_sl_wait_for_idle(struct cpsw_sl *sl, unsigned long tmo);