ATH79_CLK_MDIO
ath79_set_clk(ATH79_CLK_MDIO, 100 * 1000 * 1000);
[ATH79_CLK_MDIO] = "mdio",
if (!clks[ATH79_CLK_MDIO])
clks[ATH79_CLK_MDIO] = clks[ATH79_CLK_REF];