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

     SiFive PWM controller
     
     Unlike most other PWM controllers, the SiFive PWM controller currently only
     supports one period for all channels in the PWM. All PWMs need to run at
     the same period. The period also has significant restrictions on the values
     it can achieve, which the driver rounds to the nearest achievable period.
     PWM RTL that corresponds to the IP block version numbers can be found
     here:
     
    https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm
    
    Required properties:
    - compatible: Should be "sifive,<chip>-pwm" and "sifive,pwm<version>".
      Supported compatible strings are: "sifive,fu540-c000-pwm" for the SiFive
      PWM v0 as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the
      SiFive PWM v0 IP block with no chip integration tweaks.
      Please refer to sifive-blocks-ip-versioning.txt for details.
    - reg: physical base address and length of the controller's registers
    - clocks: Should contain a clock identifier for the PWM's parent clock.
    - #pwm-cells: Should be 3. See pwm.yaml in this directory
      for a description of the cell format.
    - interrupts: one interrupt per PWM channel
    
    Examples:
    
    pwm:  pwm@10020000 {
            compatible = "sifive,fu540-c000-pwm", "sifive,pwm0";
            reg = <0x0 0x10020000 0x0 0x1000>;
            clocks = <&tlclk>;
            interrupt-parent = <&plic>;
            interrupts = <42 43 44 45>;
            #pwm-cells = <3>;
    };

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