linux-kernel - Re: [PATCH v2 1/2] ASoC: dt-bindings: nau8821: Add DMIC slew rate selection

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Message-ID: <20231027-pronto-prideful-2cf3415a9d87@spud>
Date:   Fri, 27 Oct 2023 15:11:35 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Seven Lee <wtli@...oton.com>
Cc:     broonie@...nel.org, lgirdwood@...il.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        conor+dt@...nel.org, YHCHuang@...oton.com, KCHSU0@...oton.com,
        CTLIN0@...oton.com, SJLIN0@...oton.com, scott6986@...il.com,
        supercraig0719@...il.com, dardar923@...il.com
Subject: Re: [PATCH v2 1/2] ASoC: dt-bindings: nau8821: Add DMIC slew rate
 selection

Hey,

On Fri, Oct 27, 2023 at 04:21:43PM +0800, Seven Lee wrote:
> Add input with DMIC slew rate selection
> 
> Signed-off-by: Seven Lee <wtli@...oton.com>
> ---
>  .../devicetree/bindings/sound/nuvoton,nau8821.yaml        | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> index 3e54abd4ca74..01028b7ff85c 100644
> --- a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> +++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> @@ -89,6 +89,13 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      default: 3072000
>  
> +  nuvoton,dmic-slew-rate-selection:
> +    description: the number from 0 to 7 that sets the DMIC slew rate.
> +        The unit is mV/ns. 0 is the slowest, and 7 is the fastest.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 7
> +    default: 0

I meant make the property in terms of the unit, so
nuvoton,dmic-slew-rate-volt-per-sec (or similar, Rob would likely know
better how he likes the unit suffix for a more complex unit like this
one) and then make it an enum with possible values corresponding to
the real values that putting 0, 1, 2, 3 etc into the register produces.

Cheers,
Conor.

> +
>    nuvoton,left-input-single-end:
>      description: Enable left input with single-ended settings if set.
>          For the headset mic application, the single-ended control is
> @@ -127,6 +134,7 @@ examples:
>              nuvoton,jack-insert-debounce = <7>;
>              nuvoton,jack-eject-debounce = <0>;
>              nuvoton,dmic-clk-threshold = <3072000>;
> +            nuvoton,dmic-slew-rate-selection= <0>;
>              #sound-dai-cells = <0>;
>          };
>      };
> -- 
> 2.25.1
> 

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