FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/clock/artpec6.txt

     * Clock bindings for Axis ARTPEC-6 chip
     
     The bindings are based on the clock provider binding in
     Documentation/devicetree/bindings/clock/clock-bindings.txt
     
     External clocks:
     ----------------
     
     There are two external inputs to the main clock controller which should be
    provided using the common clock bindings.
    - "sys_refclk": External 50 Mhz oscillator (required)
    - "i2s_refclk": Alternate audio reference clock (optional).
    
    Main clock controller
    ---------------------
    
    Required properties:
    - #clock-cells: Should be <1>
      See dt-bindings/clock/axis,artpec6-clkctrl.h for the list of valid identifiers.
    - compatible: Should be "axis,artpec6-clkctrl"
    - reg: Must contain the base address and length of the system controller
    - clocks:  Must contain a phandle entry for each clock in clock-names
    - clock-names: Must include the external oscillator ("sys_refclk"). Optional
      ones are the audio reference clock ("i2s_refclk") and the audio fractional
      dividers ("frac_clk0" and "frac_clk1").
    
    Examples:
    
    ext_clk: ext_clk {
            #clock-cells = <0>;
            compatible = "fixed-clock";
            clock-frequency = <50000000>;
    };
    
    clkctrl: clkctrl@f8000000 {
            #clock-cells = <1>;
            compatible = "axis,artpec6-clkctrl";
            reg = <0xf8000000 0x48>;
            clocks = <&ext_clk>;
            clock-names = "sys_refclk";
    };

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