linux-kernel - Re: [PATCH v10 3/4] dt-bindings: input: pwm-beeper: add volume

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Message-ID: <d4c1da7b-5b49-6bbf-4470-b3f2eef7f745@linaro.org>
Date:   Wed, 1 Feb 2023 17:15:27 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manuel Traut <manuel.traut@...com>, linux-kernel@...r.kernel.org
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v10 3/4] dt-bindings: input: pwm-beeper: add volume

On 01/02/2023 16:21, Manuel Traut wrote:
> Adds an array of supported volume levels and a default volume level.

Adds -> Add


> 
> Signed-off-by: Manuel Traut <manuel.traut@...com>
> ---
>  .../devicetree/bindings/input/pwm-beeper.yaml   | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 

Thank you for your patch. There is something to discuss/improve.

> 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).

Is range 0-5000 limitation of the device? If so, this should not be
free-form text, but "maximum: 5000" (minimum is 0 anyway).

> +      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).


Best regards,
Krzysztof