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Date: Tue, 24 Jan 2023 17:41:52 +0100 From: Manuel Traut <manuel.traut@...com> To: linux-kernel@...r.kernel.org Subject: [PATCH 3/5 v7] dt-bindings: input: pwm-beeper: add documentation for volume devcetree bindings This patch adds the documentation for the devicetree bindings to set the volume levels. Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de> Signed-off-by: Manuel Traut <manuel.traut@...com> Acked-by: Rob Herring <robh@...nel.org> --- .../devicetree/bindings/input/pwm-beeper.yaml | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/devicetree/bindings/input/pwm-beeper.yaml b/Documentation/devicetree/bindings/input/pwm-beeper.yaml index 24a40f0f77c1..fe1bbc10147b 100644 --- a/Documentation/devicetree/bindings/input/pwm-beeper.yaml +++ b/Documentation/devicetree/bindings/input/pwm-beeper.yaml @@ -28,6 +28,23 @@ properties: beeper-hz: description: bell frequency in Hz + + volume-levels: + description: > + 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: + description: > + The default volume level (index into the array defined + by the "volume-levels" property). + required: - compatible - pwms @@ -45,4 +62,6 @@ examples: compatible = "pwm-beeper"; pwms = <&pwm0>; amp-supply = <&beeper_amp>; + volume-levels = <0 8 20 40 500>; + default-volume-level = <4>; }; -- 2.39.0
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