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Signed-off-by: Manuel Traut --- .../devicetree/bindings/input/pwm-beeper.yaml | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/devicetree/bindings/input/pwm-beeper.yaml b/Documentation/devicetree/bindings/input/pwm-beeper.yaml index 1ebc3a46d934..6599e28ba5e6 100644 --- a/Documentation/devicetree/bindings/input/pwm-beeper.yaml +++ b/Documentation/devicetree/bindings/input/pwm-beeper.yaml @@ -25,6 +25,21 @@ properties: beeper-hz: description: bell frequency in Hz + volume-levels-bp: + description: > + Array of PWM duty cycle values that correspond to + linear volume levels. These need to be in the range of + 0 to 5000, while 0 means 0% duty cycle (mute) and 5000 + 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 10 to 300 (0.1-3% + duty cycle). + + default-volume-level-bp: + description: > + The default volume level. + required: - compatible - pwms @@ -36,4 +51,6 @@ examples: beeper { compatible = "pwm-beeper"; pwms = <&pwm0>; + volume-levels-bp = <0 80 200 400 5000>; + default-volume-level-bp = <80>; };