FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/clock/samsung,s5pv210-clock.txt

     * Samsung S5P6442/S5PC110/S5PV210 Clock Controller
     
     Samsung S5P6442, S5PC110 and S5PV210 SoCs contain integrated clock
     controller, which generates and supplies clock to various controllers
     within the SoC.
     
     Required Properties:
     
     - compatible: should be one of following:
            - "samsung,s5pv210-clock" : for clock controller of Samsung
              S5PC110/S5PV210 SoCs,
            - "samsung,s5p6442-clock" : for clock controller of Samsung
              S5P6442 SoC.
    
    - reg: physical base address of the controller and length of memory mapped
      region.
    
    - #clock-cells: should be 1.
    
    All available clocks are defined as preprocessor macros in
    dt-bindings/clock/s5pv210.h header and can be used in device tree sources.
    
    External clocks:
    
    There are several clocks that are generated outside the SoC. It is expected
    that they are defined using standard clock bindings with following
    clock-output-names:
     - "xxti": external crystal oscillator connected to XXTI and XXTO pins of
    the SoC,
     - "xusbxti": external crystal oscillator connected to XUSBXTI and XUSBXTO
    pins of the SoC,
    
    A subset of above clocks available on given board shall be specified in
    board device tree, including the system base clock, as selected by XOM[0]
    pin of the SoC. Refer to generic fixed rate clock bindings
    documentation[1] for more information how to specify these clocks.
    
    [1] Documentation/devicetree/bindings/clock/fixed-clock.yaml
    
    Example: Clock controller node:
    
            clock: clock-controller@7e00f000 {
                    compatible = "samsung,s5pv210-clock";
                    reg = <0x7e00f000 0x1000>;
                    #clock-cells = <1>;
            };
    
    Example: Required external clocks:
    
            xxti: clock-xxti {
                    compatible = "fixed-clock";
                    clock-output-names = "xxti";
                    clock-frequency = <24000000>;
                    #clock-cells = <0>;
            };
    
            xusbxti: clock-xusbxti {
                    compatible = "fixed-clock";
                    clock-output-names = "xusbxti";
                    clock-frequency = <24000000>;
                    #clock-cells = <0>;
            };
    
    Example: UART controller node that consumes the clock generated by the clock
      controller (refer to the standard clock bindings for information about
      "clocks" and "clock-names" properties):
    
            uart0: serial@e2900000 {
                    compatible = "samsung,s5pv210-uart";
                    reg = <0xe2900000 0x400>;
                    interrupt-parent = <&vic1>;
                    interrupts = <10>;
                    clock-names = "uart", "clk_uart_baud0",
                                    "clk_uart_baud1";
                    clocks = <&clocks UART0>, <&clocks UART0>,
                                    <&clocks SCLK_UART0>;
            };

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