FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/pwm/pwm-bcm2835.txt

     BCM2835 PWM controller (Raspberry Pi controller)
     
     Required properties:
     - compatible: should be "brcm,bcm2835-pwm"
     - reg: physical base address and length of the controller's registers
     - clocks: This clock defines the base clock frequency of the PWM hardware
       system, the period and the duty_cycle of the PWM signal is a multiple of
       the base period.
     - #pwm-cells: Should be 3. See pwm.yaml in this directory for a description of
      the cells format.
    
    Examples:
    
    pwm@2020c000 {
            compatible = "brcm,bcm2835-pwm";
            reg = <0x2020c000 0x28>;
            clocks = <&clk_pwm>;
            #pwm-cells = <3>;
    };
    
    clocks {
            ....
                    clk_pwm: pwm {
                            compatible = "fixed-clock";
                            reg = <3>;
                            #clock-cells = <0>;
                            clock-frequency = <9200000>;
                    };
            ....
    };

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