| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | TI/National Semiconductor LP3943 PWM controller |
| 2 | |
| 3 | Required properties: |
| 4 | - compatible: "ti,lp3943-pwm" |
| 5 | - #pwm-cells: Should be 2. See pwm.yaml in this directory for a |
| 6 | description of the cells format. |
| 7 | Note that this hardware limits the period length to the |
| 8 | range 6250~1600000. |
| 9 | - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1. |
| 10 | 0 = output 0 |
| 11 | 1 = output 1 |
| 12 | . |
| 13 | . |
| 14 | 15 = output 15 |
| 15 | |
| 16 | Example: |
| 17 | PWM 0 is for RGB LED brightness control |
| 18 | PWM 1 is for brightness control of LP8557 backlight device |
| 19 | |
| 20 | &i2c3 { |
| 21 | lp3943@60 { |
| 22 | compatible = "ti,lp3943"; |
| 23 | reg = <0x60>; |
| 24 | |
| 25 | /* |
| 26 | * PWM 0 : output 8, 9 and 10 |
| 27 | * PWM 1 : output 15 |
| 28 | */ |
| 29 | pwm3943: pwm { |
| 30 | compatible = "ti,lp3943-pwm"; |
| 31 | #pwm-cells = <2>; |
| 32 | ti,pwm0 = <8 9 10>; |
| 33 | ti,pwm1 = <15>; |
| 34 | }; |
| 35 | }; |
| 36 | |
| 37 | }; |
| 38 | |
| 39 | /* LEDs control with PWM 0 of LP3943 */ |
| 40 | pwmleds { |
| 41 | compatible = "pwm-leds"; |
| 42 | rgb { |
| 43 | label = "indi::rgb"; |
| 44 | pwms = <&pwm3943 0 10000>; |
| 45 | max-brightness = <255>; |
| 46 | }; |
| 47 | }; |
| 48 | |
| 49 | &i2c4 { |
| 50 | /* Backlight control with PWM 1 of LP3943 */ |
| 51 | backlight@2c { |
| 52 | compatible = "ti,lp8557"; |
| 53 | reg = <0x2c>; |
| 54 | |
| 55 | pwms = <&pwm3943 1 10000>; |
| 56 | pwm-names = "lp8557"; |
| 57 | }; |
| 58 | }; |