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

     * Amlogic GXBB AO Clock and Reset Unit
     
     The Amlogic GXBB AO clock controller generates and supplies clock to various
     controllers within the Always-On part of the SoC.
     
     Required Properties:
     
     - compatible: value should be different for each SoC family as :
             - GXBB (S905) : "amlogic,meson-gxbb-aoclkc"
            - GXL (S905X, S905D) : "amlogic,meson-gxl-aoclkc"
            - GXM (S912) : "amlogic,meson-gxm-aoclkc"
            - AXG (A113D, A113X) : "amlogic,meson-axg-aoclkc"
            - G12A (S905X2, S905D2, S905Y2) : "amlogic,meson-g12a-aoclkc"
            followed by the common "amlogic,meson-gx-aoclkc"
    - clocks: list of clock phandle, one for each entry clock-names.
    - clock-names: should contain the following:
      * "xtal"     : the platform xtal
      * "mpeg-clk" : the main clock controller mother clock (aka clk81)
      * "ext-32k-0"  : external 32kHz reference #0 if any (optional)
      * "ext-32k-1"  : external 32kHz reference #1 if any (optional - gx only)
      * "ext-32k-2"  : external 32kHz reference #2 if any (optional - gx only)
    
    - #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-aoclkc.h header and can be
    used in device tree sources.
    
    - #reset-cells: should be 1.
    
    Each reset is assigned an identifier and client nodes can use this identifier
    to specify the reset which they consume. All available resets are defined as
    preprocessor macros in the dt-bindings/reset/gxbb-aoclkc.h header and can be
    used in device tree sources.
    
    Parent node should have the following properties :
    - compatible: "amlogic,meson-gx-ao-sysctrl", "syscon", "simple-mfd"
    - reg: base address and size of the AO system control register space.
    
    Example: AO Clock controller node:
    
    ao_sysctrl: sys-ctrl@0 {
            compatible = "amlogic,meson-gx-ao-sysctrl", "syscon", "simple-mfd";
            reg =  <0x0 0x0 0x0 0x100>;
    
            clkc_AO: clock-controller {
                    compatible = "amlogic,meson-gxbb-aoclkc", "amlogic,meson-gx-aoclkc";
                    #clock-cells = <1>;
                    #reset-cells = <1>;
                    clocks = <&xtal>, <&clkc CLKID_CLK81>;
                    clock-names = "xtal", "mpeg-clk";
            };
    
    Example: UART controller node that consumes the clock and reset generated
      by the clock controller:
    
            uart_AO: serial@4c0 {
                    compatible = "amlogic,meson-uart";
                    reg = <0x4c0 0x14>;
                    interrupts = <0 90 1>;
                    clocks = <&clkc_AO CLKID_AO_UART1>;
                    resets = <&clkc_AO RESET_AO_UART1>;
            };

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