Kernel-4.18.0-80.el8_pwm-bcm2835

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.txt 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>;
};
….
};