linux-kernel - Re: [PATCH v1 3/3] dt-bindings: ASoC: Add ESS ES9218P codec bindings

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Date:   Thu, 11 May 2023 11:58:20 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
        lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] dt-bindings: ASoC: Add ESS ES9218P codec bindings

On 10/05/2023 13:23, Aidan MacDonald wrote:
> Device tree bindings for the ESS ES9218P codec, which uses an
> I2C control interface.
> 

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

Subject: reverse dt-bindings and ASoC.

Subject: drop second/last, redundant "bindings". The "dt-bindings"
prefix is already stating that these are bindings.

> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> ---
>  .../bindings/sound/ess,es9218p.yaml           | 104 ++++++++++++++++++
>  1 file changed, 104 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/ess,es9218p.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/ess,es9218p.yaml b/Documentation/devicetree/bindings/sound/ess,es9218p.yaml
> new file mode 100644
> index 000000000000..d205b6a8bbb2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/ess,es9218p.yaml
> @@ -0,0 +1,104 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/ess,es9218p.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ESS ES9218P audio codec
> +
> +maintainers:
> +  - Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> +

allOf with ref to dai-common.

> +properties:
> +  compatible:
> +    const: ess,es9218p
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#sound-dai-cells":
> +    const: 0
> +
> +  avdd-supply:
> +    description:
> +      Definition of the regulator used for digital core power supply.

Drop "Definition of the regulator used for"

> +
> +  vcca-supply:
> +    description:
> +      Definition of the regulator used for oscillator and DAC power supply.
> +

Ditto

> +  avcc3v3-supply:
> +    description:
> +      Definition of the 3.3V regulator for amplifier, switch, and charge pumps.

Drop "Definition of"


> +
> +  avcc1v8-supply:
> +    description:
> +      Definition of the 1.8V regulator for amplifier, switch, and charge pumps.

Ditto

> +
> +  clocks:
> +    items:
> +      - description: clock for master clock (MCLK)
> +
> +  clock-names:
> +    items:
> +      - const: mclk

Drop entire names, not really useful.

> +
> +  reset-gpios:
> +    maxItems: 1
> +    description:
> +      Pin used for codec hardware reset, corresponds to the RESETB pin.
> +
> +  ess,max-clock-div:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Sets the maximum MCLK divider for generating the internal CLK.
> +      CLK must be at least 20x the I2C bus speed or I2C transactions
> +      will fail. The maximum divider should be chosen to ensure that
> +      CLK will not fall below the limit.
> +    enum:
> +      - 1
> +      - 2
> +      - 4
> +      - 8
> +    default: 1

Why do you need to customize it per board?

> +
> +  ess,oscillator-pad-bias:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Sets the oscillator pad drive bias. 0 - full bias, 15 - disabled.
> +    minimum: 0
> +    maximum: 15
> +    default: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#sound-dai-cells"
> +  - avdd-supply
> +  - vcca-supply
> +  - avcc3v3-supply
> +  - avcc1v8-supply
> +  - clocks
> +  - clock-names
> +  - reset-gpios
> +
> +additionalProperties: false

Instead: unevaluatedProperties: false


> +
> +examples:

Best regards,
Krzysztof