0001 TI/National Semiconductor LP3943 PWM controller
0002
0003 Required properties:
0004 - compatible: "ti,lp3943-pwm"
0005 - #pwm-cells: Should be 2. See pwm.yaml in this directory for a
0006 description of the cells format.
0007 Note that this hardware limits the period length to the
0008 range 6250~1600000.
0009 - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
0010 0 = output 0
0011 1 = output 1
0012 .
0013 .
0014 15 = output 15
0015
0016 Example:
0017 PWM 0 is for RGB LED brightness control
0018 PWM 1 is for brightness control of LP8557 backlight device
0019
0020 &i2c3 {
0021 lp3943@60 {
0022 compatible = "ti,lp3943";
0023 reg = <0x60>;
0024
0025 /*
0026 * PWM 0 : output 8, 9 and 10
0027 * PWM 1 : output 15
0028 */
0029 pwm3943: pwm {
0030 compatible = "ti,lp3943-pwm";
0031 #pwm-cells = <2>;
0032 ti,pwm0 = <8 9 10>;
0033 ti,pwm1 = <15>;
0034 };
0035 };
0036
0037 };
0038
0039 /* LEDs control with PWM 0 of LP3943 */
0040 pwmleds {
0041 compatible = "pwm-leds";
0042 rgb {
0043 label = "indi::rgb";
0044 pwms = <&pwm3943 0 10000>;
0045 max-brightness = <255>;
0046 };
0047 };
0048
0049 &i2c4 {
0050 /* Backlight control with PWM 1 of LP3943 */
0051 backlight@2c {
0052 compatible = "ti,lp8557";
0053 reg = <0x2c>;
0054
0055 pwms = <&pwm3943 1 10000>;
0056 pwm-names = "lp8557";
0057 };
0058 };
