linux-kernel - Re: [PATCH 3/9] ASoC: dt-bindings: sound: Add Samsung ExynosAuto ABOX binding

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Message-ID: <6dc0c8d7-e081-4a3d-b289-368b6da69011@kernel.org>
Date: Mon, 21 Jul 2025 08:44:38 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: ew kim <ew.kim@...sung.com>, broonie@...nel.org, s.nawrocki@...sung.com,
 robh@...nel.org, krzk+dt@...nel.org
Cc: lgirdwood@...il.com, tiwai@...e.com, perex@...ex.cz, conor+dt@...nel.org,
 alim.akhtar@...sung.com, linux-sound@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] ASoC: dt-bindings: sound: Add Samsung ExynosAuto ABOX
 binding

On 21/07/2025 04:30, ew kim wrote:
> Add the device tree binding documentation for the Samsung Exynos Automotive
> ABOX generic audio management core. This binding describes how to configure
> the maximum number of PCM playback, PCM capture, and dummy I2S backend
> instances for the ABOX core. Actual hardware functionality is provided
> by child audio sub-drivers.
> 
> Signed-off-by: ew kim <ew.kim@...sung.com>
> ---
>  .../bindings/sound/samsung,exynosauto.yaml    | 69 +++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/samsung,exynosauto.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/samsung,exynosauto.yaml b/Documentation/devicetree/bindings/sound/samsung,exynosauto.yaml
> new file mode 100644
> index 000000000000..b1e49f38ffe9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/samsung,exynosauto.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/samsung,exynosauto.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung Exynos Automotive Abox Generic
> +
> +maintainers:
> +  - Eunwoo Kim <ew.kim@...sung.com>
> +
> +description: |
> +  The Samsung Exynos Automotive Abox Generic node represents a
> +  generic audio management platform device inside Exynos Automotive SoCs.

No, we do not add bindings for "generic" stuff.

Describe the SoC.

> +  It does not directly control hardware resources itself, but acts as

Does not control hardware? so not suitable for bindings and DTS.

> +  a common interface to manage child audio sub-drivers for PCM playback,
> +  PCM capture, and I2S dummy backends.

Not relevant.

> +
> +  Typically, this node provides configuration for the maximum number of
> +  PCM playback and capture devices (ALSA PCM) and the maximum number
> +  of dummy I2S backend devices. The actual hardware control is handled
> +  by child drivers attached to this generic core.

Not relevant. Describe the hardware.

> +
> +  This node must exist for the platform driver to probe,
> +  even though it does not map any physical hardware address.

Drivers are not relevant, read writing bindings.

> +
> +properties:
> +  compatible:
> +    const: samsung,abox_generic

You did not implement previous feedback. This does not follow DTS coding
style and writing bindings.

I already asked you to read DTS coding style and nothing improved, no
issues were resolved.

> +
> +  samsung,num-pcm-playback:
> +    description: Maximum number of PCM playback instances (ALSA PCM devices).
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  samsung,num-pcm-capture:
> +    description: Maximum number of PCM capture instances (ALSA PCM devices).
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  samsung,num-i2s-dummy-backend:
> +    description: Maximum number of dummy I2S backend instances.
> +    $ref: /schemas/types.yaml#/definitions/uint32

Nothing above describes hardware. Bindings are not for ALSA.

> +
> +  '#address-cells':
> +    description: Required for child nodes that may declare address space.
> +    const: 2
> +
> +  '#size-cells':
> +    description: Required for child nodes that may declare address space.
> +    const: 1
> +
> +required:
> +  - compatible
> +  - samsung,num-pcm-playback
> +  - samsung,num-pcm-capture
> +  - samsung,num-i2s-dummy-backend
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    abox_generic {

Did you read DTS coding style?

> +      compatible = "samsung,abox_generic";
> +      samsung,num-pcm-playback = <32>;
> +      samsung,num-pcm-capture = <32>;
> +      samsung,num-i2s-dummy-backend = <5>;
> +      status = "disabled";

No.

> +      #address-cells = <2>;
> +      #size-cells = <1>;
> +    };


Best regards,
Krzysztof