Hi Nicolin, On Fri, Jun 7, 2013 at 7:14 AM, Nicolin Chen <b42378 at freescale.com> wrote: > + data->clk_frequency = clk_get_rate(data->codec_clk); > + clk_prepare_enable(data->codec_clk); Please check the return value from 'clk_prepare_enable()' Regards, Fabio Estevam