Kernel-4.18.0-80.el8_samsung,s5pv210-clock

• 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.txt

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>;
};