ATH79_CLK_REF
[ATH79_CLK_REF] = "ref",
clks[ATH79_CLK_REF] = ref_clk;
clks[ATH79_CLK_MDIO] = clks[ATH79_CLK_REF];
struct clk *clk = clks[ATH79_CLK_REF];
clk = ath79_set_clk(ATH79_CLK_REF, rate);