ref_cpu 81 drivers/clk/mxs/clk-imx23.c ref_xtal, pll, ref_cpu, ref_emi, ref_pix, ref_io, saif_sel, ref_cpu 133 drivers/clk/mxs/clk-imx28.c ref_xtal, pll0, pll1, pll2, ref_cpu, ref_emi, ref_io0, ref_io1,