FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/pwm/pwm-sprd.txt

     Spreadtrum PWM controller
     
     Spreadtrum SoCs PWM controller provides 4 PWM channels.
     
     Required properties:
     - compatible : Should be "sprd,ums512-pwm".
     - reg: Physical base address and length of the controller's registers.
     - clocks: The phandle and specifier referencing the controller's clocks.
     - clock-names: Should contain following entries:
      "pwmn": used to derive the functional clock for PWM channel n (n range: 0 ~ 3).
      "enablen": for PWM channel n enable clock (n range: 0 ~ 3).
    - #pwm-cells: Should be 2. See pwm.yaml in this directory for a description of
      the cells format.
    
    Optional properties:
    - assigned-clocks: Reference to the PWM clock entries.
    - assigned-clock-parents: The phandle of the parent clock of PWM clock.
    
    Example:
            pwms: pwm@32260000 {
                    compatible = "sprd,ums512-pwm";
                    reg = <0 0x32260000 0 0x10000>;
                    clock-names = "pwm0", "enable0",
                            "pwm1", "enable1",
                            "pwm2", "enable2",
                            "pwm3", "enable3";
                    clocks = <&aon_clk CLK_PWM0>, <&aonapb_gate CLK_PWM0_EB>,
                           <&aon_clk CLK_PWM1>, <&aonapb_gate CLK_PWM1_EB>,
                           <&aon_clk CLK_PWM2>, <&aonapb_gate CLK_PWM2_EB>,
                           <&aon_clk CLK_PWM3>, <&aonapb_gate CLK_PWM3_EB>;
                    assigned-clocks = <&aon_clk CLK_PWM0>,
                            <&aon_clk CLK_PWM1>,
                            <&aon_clk CLK_PWM2>,
                            <&aon_clk CLK_PWM3>;
                    assigned-clock-parents = <&ext_26m>,
                            <&ext_26m>,
                            <&ext_26m>,
                            <&ext_26m>;
                    #pwm-cells = <2>;
            };

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