linux-kernel - Re: [PATCH 1/2] ASoC: dt-bindings: Add adi,ssm3515 amp schema

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Date:   Tue, 9 May 2023 19:25:12 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Nuno Sá <nuno.sa@...log.com>,
        asahi@...ts.linux.dev, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ASoC: dt-bindings: Add adi,ssm3515 amp schema

Hey Martin,

On Tue, May 09, 2023 at 06:38:27PM +0200, Martin Povišer wrote:
> Add a DT schema for the SSM3515 amp by Analog Devices. It's a simple
> mono amplifier with digital input.
> 
> Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
> ---
>  .../bindings/sound/adi,ssm3515.yaml           | 66 +++++++++++++++++++
>  1 file changed, 66 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/adi,ssm3515.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/adi,ssm3515.yaml b/Documentation/devicetree/bindings/sound/adi,ssm3515.yaml
> new file mode 100644
> index 000000000000..19b7185ae8e2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/adi,ssm3515.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2019-20 Texas Instruments Incorporated

Copyright here looks a little odd, copy & paste from the TI bindings you
send patches for earlier, or intended?

> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/sound/adi,ssm3515.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"

Drop the quotes on these please.

> +
> +title: Analog Devices SSM3515 Audio Amplifier
> +
> +maintainers:
> +  - Martin Povišer <povik+lin@...ebit.org>
> +
> +description: |
> +  SSM3515 is a mono Class-D audio amplifier with digital input.
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/SSM3515.pdf
> +
> +allOf:
> +  - $ref: dai-common.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ssm3515
> +
> +  reg:
> +    maxItems: 1
> +
> +  adi,ana-gain:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3]
> +    description: |
> +      The value to be set in the ANA_GAIN register field on the codec. This determines
> +      the full voltage span of the codec's analog output.
> +
> +      To quote the datasheet on the available options:
> +
> +        00: 8.4 V Full-Scale Gain Mapping
> +        01: 12.6 V Full-Scale Gain Mapping
> +        10: 14 V Full-Scale Gain Mapping
> +        11: 15 V Full-Scale Gain Mapping

Putting register values into the DT does not seem correct, although
I know nothing about sound and will have to defer to Krzysztof & Co. on
that front.

Cheers,
Conor.

> +
> +  '#sound-dai-cells':
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - adi,ana-gain
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      codec@14 {
> +        compatible = "adi,ssm3515";
> +        reg = <0x14>;
> +        #sound-dai-cells = <0>;
> +        adi,ana-gain = <0>;
> +        sound-name-prefix = "Left Tweeter";
> +      };
> +    };
> -- 
> 2.38.3
> 

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