MXS cpufreq driver
-------------------

MXS i.MX28 SoC cpufreq driver for CPU frequency scaling.

Required properties:
- cpufreq_tbl: Table of frequencies CPU could be transitioned into, in the
  increasing order.

Optional properties:
- clock-latency: Specify the possible maximum transition latency for clock, in
  unit of nanoseconds.

Both required and optional properties listed above must be defined under node
/cpus/cpu@0.

Examples:
--------
cpus {

        <...>

        cpu@0 {
                cpufreq {
                        compatible = "digi,mxs-cpufreq";
                        cpufreq_tbl = < 64000
                                        261818
                                        360000
                                        454736 >;

                        clock-latency = <1000>;
                };
        };


        <...>

};
