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 };
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