@@ -5,3 +5,23 @@ Registers a PWM device as beeper.
Required properties:
- compatible: should be "pwm-beeper"
- pwms: phandle to the physical PWM device
+
+Optional properties:
+- volume-levels: Array of PWM duty cycle values that correspond to
+ linear volume levels. These need to be in the range of 0 to 500,
+ while 0 means 0% duty cycle (mute) and 500 means 50% duty cycle
+ (max volume).
+ Please note that the actual volume of most beepers is highly
+ non-linear, which means that low volume levels are probably somewhere
+ in the range of 1 to 30 (0.1-3% duty cycle).
+- default-volume-level: the default volume level (index into the
+ array defined by the "volume-levels" property)
+
+Example:
+
+ pwm-beeper {
+ compatible = "pwm-beeper";
+ pwms = <&pwm4 0 5000>;
+ volume-levels = <0 8 20 40 500>;
+ default-volume-level = <4>;
+ };