| TI/National Semiconductor LP3943 PWM controller |
| |
| Required properties: |
| - compatible: "ti,lp3943-pwm" |
| - #pwm-cells: Should be 2. See pwm.yaml 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"; |
| }; |
| }; |
