MPC512x_CLK_REF
clk_register_clkdev(clks[MPC512x_CLK_REF], "ref", NULL);
clks[MPC512x_CLK_REF] = mpc512x_clk_factor("ref", "osc", 1, 1);
calc_freq = clk_get_rate(clks[MPC512x_CLK_REF]);
clks[MPC512x_CLK_REF] = mpc512x_clk_fixed("ref", calc_freq);