| Message ID | 48a18fbdabcce57ee8efa57b9b6033d1462ab492.1484838551.git.frieder.schrempf@exceet.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Jan 19, 2017 at 04:24:09PM +0100, Frieder Schrempf wrote: > This patch adds the documentation for the devicetree bindings to set > the volume levels. > > Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> > --- > Changes in v3: > - change description of volume-levels to be used for linear levels > > .../devicetree/bindings/input/pwm-beeper.txt | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) Acked-by: Rob Herring <robh@kernel.org> -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/input/pwm-beeper.txt b/Documentation/devicetree/bindings/input/pwm-beeper.txt index be332ae..496b68f 100644 --- a/Documentation/devicetree/bindings/input/pwm-beeper.txt +++ b/Documentation/devicetree/bindings/input/pwm-beeper.txt @@ -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>; + };
This patch adds the documentation for the devicetree bindings to set the volume levels. Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> --- Changes in v3: - change description of volume-levels to be used for linear levels .../devicetree/bindings/input/pwm-beeper.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)