FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/cpufreq/cpufreq-dt.txt

     Generic cpufreq driver
     
     It is a generic DT based cpufreq driver for frequency management.  It supports
     both uniprocessor (UP) and symmetric multiprocessor (SMP) systems which share
     clock and voltage across all CPUs.
     
     Both required and optional properties listed below must be defined
     under node /cpus/cpu@0.
     
    Required properties:
    - None
    
    Optional properties:
    - operating-points: Refer to Documentation/devicetree/bindings/opp/opp-v1.yaml for
      details. OPPs *must* be supplied either via DT, i.e. this property, or
      populated at runtime.
    - clock-latency: Specify the possible maximum transition latency for clock,
      in unit of nanoseconds.
    - voltage-tolerance: Specify the CPU voltage tolerance in percentage.
    - #cooling-cells:
         Please refer to
         Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml.
    
    Examples:
    
    cpus {
            #address-cells = <1>;
            #size-cells = <0>;
    
            cpu@0 {
                    compatible = "arm,cortex-a9";
                    reg = <0>;
                    next-level-cache = <&L2>;
                    operating-points = <
                            /* kHz    uV */
                            792000  1100000
                            396000  950000
                            198000  850000
                    >;
                    clock-latency = <61036>; /* two CLK32 periods */
                    #cooling-cells = <2>;
            };
    
            cpu@1 {
                    compatible = "arm,cortex-a9";
                    reg = <1>;
                    next-level-cache = <&L2>;
            };
    
            cpu@2 {
                    compatible = "arm,cortex-a9";
                    reg = <2>;
                    next-level-cache = <&L2>;
            };
    
            cpu@3 {
                    compatible = "arm,cortex-a9";
                    reg = <3>;
                    next-level-cache = <&L2>;
            };
    };

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