Kernel-4.18.0-80.el8_pwm-lp3943

TI/National Semiconductor LP3943 PWM controller

Required properties:

• compatible: “ti,lp3943-pwm”
• #pwm-cells: Should be 2. See pwm.txt in this directory for a

          description of the cells format.
          Note that this hardware limits the period length to the
          range 6250~1600000.
  

• ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
  0 = output 0
  1 = output 1
  .
  .
  15 = output 15

Example:
PWM 0 is for RGB LED brightness control
PWM 1 is for brightness control of LP8557 backlight device

&i2c3 {
lp3943@60 {
compatible = “ti,lp3943”;
reg = <0x60>;

    /*
     * PWM 0 : output 8, 9 and 10
     * PWM 1 : output 15
     */
    pwm3943: pwm {
        compatible = "ti,lp3943-pwm";
        #pwm-cells = <2>;
        ti,pwm0 = <8 9 10>;
        ti,pwm1 = <15>;
    };
};

};

/* LEDs control with PWM 0 of LP3943 */
pwmleds {
compatible = “pwm-leds”;
rgb {
label = “indi::rgb”;
pwms = <&pwm3943 0 10000>;
max-brightness = <255>;
};
};

&i2c4 {
/* Backlight control with PWM 1 of LP3943 */
backlight@2c {
compatible = “ti,lp8557”;
reg = <0x2c>;

    pwms = <&pwm3943 1 10000>;
    pwm-names = "lp8557";
};

};