Kernel-3.10.0-957.el7_kirkwoo

Marvell Kirkwood Platforms Device Tree Bindings

Boards with a SoC of the Marvell Kirkwood
shall have the following property:

Required root node property:

compatible: must contain “marvell,kirkwood”;

In order to support the kirkwood cpufreq driver, there must be a node
cpus/cpu@0 with three clocks, “cpu_clk”, “ddrclk” and “powersave”,
where the “powersave” clock is a gating clock used to switch the CPU
between the “cpu_clk” and the “ddrclk”.

Example:

cpus {
    #address-cells = <1>;
    #size-cells = <0>;

    cpu@0 {
          device_type = "cpu";
          compatible = "marvell,sheeva-88SV131";
          clocks = <&core_clk 1>, <&core_clk 3>, <&gate_clk 11>;
          clock-names = "cpu_clk", "ddrclk", "powersave";
    };