rgmii_clock
long rate = rgmii_clock(pdata->phy_speed);
rate = rgmii_clock(speed);
rate = rgmii_clock(speed);
rate = rgmii_clock(speed);
rate = rgmii_clock(speed);
freq = rgmii_clock(spd);
tx_rate = rgmii_clock(speed);
div = clk_get_rate(plat->stmmac_clk) / rgmii_clock(SPEED_1000);
long rate = rgmii_clock(speed);