FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/clock/amlogic,gxbb-clkc.txt

     * Amlogic GXBB Clock and Reset Unit
     
     The Amlogic GXBB clock controller generates and supplies clock to various
     controllers within the SoC.
     
     Required Properties:
     
     - compatible: should be:
                     "amlogic,gxbb-clkc" for GXBB SoC,
                    "amlogic,gxl-clkc" for GXL and GXM SoC,
                    "amlogic,axg-clkc" for AXG SoC.
                    "amlogic,g12a-clkc" for G12A SoC.
                    "amlogic,g12b-clkc" for G12B SoC.
                    "amlogic,sm1-clkc" for SM1 SoC.
    - clocks : list of clock phandle, one for each entry clock-names.
    - clock-names : should contain the following:
      * "xtal": the platform xtal
    
    - #clock-cells: should be 1.
    
    Each clock is assigned an identifier and client nodes can use this identifier
    to specify the clock which they consume. All available clocks are defined as
    preprocessor macros in the dt-bindings/clock/gxbb-clkc.h header and can be
    used in device tree sources.
    
    Parent node should have the following properties :
    - compatible: "syscon", "simple-mfd, and "amlogic,meson-gx-hhi-sysctrl" or
                  "amlogic,meson-axg-hhi-sysctrl"
    - reg: base address and size of the HHI system control register space.
    
    Example: Clock controller node:
    
    sysctrl: system-controller@0 {
            compatible = "amlogic,meson-gx-hhi-sysctrl", "syscon", "simple-mfd";
            reg = <0 0 0 0x400>;
    
            clkc: clock-controller {
                    #clock-cells = <1>;
                    compatible = "amlogic,gxbb-clkc";
                    clocks = <&xtal>;
                    clock-names = "xtal";
            };
    };
    
    Example: UART controller node that consumes the clock generated by the clock
      controller:
    
            uart_AO: serial@c81004c0 {
                    compatible = "amlogic,meson-uart";
                    reg = <0xc81004c0 0x14>;
                    interrupts = <0 90 1>;
                    clocks = <&clkc CLKID_CLK81>;
            };

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