GEM_CLK_TX
clock_disable(sc->sc_node, GEM_CLK_TX);
clock_set_frequency(sc->sc_node, GEM_CLK_TX, sc->sc_tx_freq);
clock_set_frequency(sc->sc_node, GEM_CLK_TX, 2500000);
clock_enable(sc->sc_node, GEM_CLK_TX);