FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/clock/sifive/fu540-prci.txt

     SiFive FU540 PRCI bindings
     
     On the FU540 family of SoCs, most system-wide clock and reset integration
     is via the PRCI IP block.
     
     Required properties:
     - compatible: Should be "sifive,<chip>-prci".  Only one value is
             supported: "sifive,fu540-c000-prci"
     - reg: Should describe the PRCI's register target physical address region
    - clocks: Should point to the hfclk device tree node and the rtcclk
              device tree node.  The RTC clock here is not a time-of-day clock,
              but is instead a high-stability clock source for system timers
              and cycle counters.
    - #clock-cells: Should be <1>
    
    The clock consumer should specify the desired clock via the clock ID
    macros defined in include/dt-bindings/clock/sifive-fu540-prci.h.
    These macros begin with PRCI_CLK_.
    
    The hfclk and rtcclk nodes are required, and represent physical
    crystals or resonators located on the PCB.  These nodes should be present
    underneath /, rather than /soc.
    
    Examples:
    
    /* under /, in PCB-specific DT data */
    hfclk: hfclk {
            #clock-cells = <0>;
            compatible = "fixed-clock";
            clock-frequency = <33333333>;
            clock-output-names = "hfclk";
    };
    rtcclk: rtcclk {
            #clock-cells = <0>;
            compatible = "fixed-clock";
            clock-frequency = <1000000>;
            clock-output-names = "rtcclk";
    };
    
    /* under /soc, in SoC-specific DT data */
    prci: clock-controller@10000000 {
            compatible = "sifive,fu540-c000-prci";
            reg = <0x0 0x10000000 0x0 0x1000>;
            clocks = <&hfclk>, <&rtcclk>;
            #clock-cells = <1>;
    };

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