1.内核编译选项
2.设备树
backlight: backlight {
status = "okay";
compatible = "pwm-backlight";
pwms = <&ehrpwm1 0 200000 0>;
brightness-levels = <0 51 53 56 62 75 101 152 255>;
default-brightness-level = <8>;
};
ehrpwm1a_pins: pinmux-ehrpwm1a-pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x848, PIN_OUTPUT_PULLDOWN | MUX_MODE6)
AM33XX_IOPAD(0x84c, PIN_OUTPUT_PULLDOWN | MUX_MODE6)
>;
};
&epwmss1 {
status = "okay";
ehrpwm1: pwm@48302200 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&ehrpwm1a_pins>;
};
