1 TI/National Semiconductor LP3943 PWM controlle 1 TI/National Semiconductor LP3943 PWM controller
2 2
3 Required properties: 3 Required properties:
4 - compatible: "ti,lp3943-pwm" 4 - compatible: "ti,lp3943-pwm"
5 - #pwm-cells: Should be 2. See pwm.yaml in t 5 - #pwm-cells: Should be 2. See pwm.yaml in this directory for a
6 description of the cells forma 6 description of the cells format.
7 Note that this hardware limits 7 Note that this hardware limits the period length to the
8 range 6250~1600000. 8 range 6250~1600000.
9 - ti,pwm0 or ti,pwm1: Output pin number(s) f 9 - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
10 0 = output 0 10 0 = output 0
11 1 = output 1 11 1 = output 1
12 . 12 .
13 . 13 .
14 15 = output 15 14 15 = output 15
15 15
16 Example: 16 Example:
17 PWM 0 is for RGB LED brightness control 17 PWM 0 is for RGB LED brightness control
18 PWM 1 is for brightness control of LP8557 back 18 PWM 1 is for brightness control of LP8557 backlight device
19 19
20 &i2c3 { 20 &i2c3 {
21 lp3943@60 { 21 lp3943@60 {
22 compatible = "ti,lp3943"; 22 compatible = "ti,lp3943";
23 reg = <0x60>; 23 reg = <0x60>;
24 24
25 /* 25 /*
26 * PWM 0 : output 8, 9 and 10 26 * PWM 0 : output 8, 9 and 10
27 * PWM 1 : output 15 27 * PWM 1 : output 15
28 */ 28 */
29 pwm3943: pwm { 29 pwm3943: pwm {
30 compatible = "ti,lp394 30 compatible = "ti,lp3943-pwm";
31 #pwm-cells = <2>; 31 #pwm-cells = <2>;
32 ti,pwm0 = <8 9 10>; 32 ti,pwm0 = <8 9 10>;
33 ti,pwm1 = <15>; 33 ti,pwm1 = <15>;
34 }; 34 };
35 }; 35 };
36 36
37 }; 37 };
38 38
39 /* LEDs control with PWM 0 of LP3943 */ 39 /* LEDs control with PWM 0 of LP3943 */
40 pwmleds { 40 pwmleds {
41 compatible = "pwm-leds"; 41 compatible = "pwm-leds";
42 rgb { 42 rgb {
43 label = "indi::rgb"; 43 label = "indi::rgb";
44 pwms = <&pwm3943 0 10000>; 44 pwms = <&pwm3943 0 10000>;
45 max-brightness = <255>; 45 max-brightness = <255>;
46 }; 46 };
47 }; 47 };
48 48
49 &i2c4 { 49 &i2c4 {
50 /* Backlight control with PWM 1 of LP3 50 /* Backlight control with PWM 1 of LP3943 */
51 backlight@2c { 51 backlight@2c {
52 compatible = "ti,lp8557"; 52 compatible = "ti,lp8557";
53 reg = <0x2c>; 53 reg = <0x2c>;
54 54
55 pwms = <&pwm3943 1 10000>; 55 pwms = <&pwm3943 1 10000>;
56 pwm-names = "lp8557"; 56 pwm-names = "lp8557";
57 }; 57 };
58 }; 58 };
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