Adds an array of supported volume levels and a default volume level.
Signed-off-by: Manuel Traut <manuel.traut@xxxxxx>
---
.../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>;
};
--
2.39.1
