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

     Rockchip PWM controller
     
     Required properties:
      - compatible: should be "rockchip,<name>-pwm"
        "rockchip,rk2928-pwm": found on RK29XX,RK3066 and RK3188 SoCs
        "rockchip,rk3288-pwm": found on RK3288 SOC
        "rockchip,rv1108-pwm", "rockchip,rk3288-pwm": found on RV1108 SoC
        "rockchip,vop-pwm": found integrated in VOP on RK3288 SoC
      - reg: physical base address and length of the controller's registers
     - clocks: See ../clock/clock-bindings.txt
       - For older hardware (rk2928, rk3066, rk3188, rk3228, rk3288, rk3399):
         - There is one clock that's used both to derive the functional clock
           for the device and as the bus clock.
       - For newer hardware (rk3328 and future socs): specified by name
         - "pwm": This is used to derive the functional clock.
         - "pclk": This is the APB bus clock.
     - #pwm-cells: must be 2 (rk2928) or 3 (rk3288). See pwm.yaml in this directory
       for a description of the cell format.
    
    Example:
    
            pwm0: pwm@20030000 {
                    compatible = "rockchip,rk2928-pwm";
                    reg = <0x20030000 0x10>;
                    clocks = <&cru PCLK_PWM01>;
                    #pwm-cells = <2>;
            };

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