FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/clock/fixed-mmio-clock.txt

     Binding for simple memory mapped io fixed-rate clock sources.
     The driver reads a clock frequency value from a single 32-bit memory mapped
     I/O register and registers it as a fixed rate clock.
     
     It was designed for test systems, like FPGA, not for complete, finished SoCs.
     
     This binding uses the common clock binding[1].
     
     [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
    
    Required properties:
    - compatible : shall be "fixed-mmio-clock".
    - #clock-cells : from common clock binding; shall be set to 0.
    - reg : Address and length of the clock value register set.
    
    Optional properties:
    - clock-output-names : From common clock binding.
    
    Example:
    sysclock: sysclock@fd020004 {
            #clock-cells = <0>;
            compatible = "fixed-mmio-clock";
            reg = <0xfd020004 0x4>;
    };

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