linux-kernel - Re: [PATCH v1 06/10] ASoC: dt-bindings: add wsa881x-i2c binding for analog mode

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Message-ID: <woeeh7cosv47z4ckqbomfc3rqqxfolyfycgcz32do2yadg7xdj@geqank3dp55t>
Date: Fri, 1 Nov 2024 08:57:26 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Alexey Klimov <alexey.klimov@...aro.org>
Cc: broonie@...nel.org, konradybcio@...nel.org, 
	konrad.dybcio@....qualcomm.com, andersson@...nel.org, srinivas.kandagatla@...aro.org, 
	tiwai@...e.com, lgirdwood@...il.com, perex@...ex.cz, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, dmitry.baryshkov@...aro.org, 
	linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 06/10] ASoC: dt-bindings: add wsa881x-i2c binding for
 analog mode

On Fri, Nov 01, 2024 at 05:31:50AM +0000, Alexey Klimov wrote:
> Add binding document for WSA881X family of smart speaker amplifiers
> that set to work in analog mode only and configurable via i2c only.
> Such devices are found in Qualcomm QRB4210 RB2 boards with
> SM4250/SM6115 SoCs.
> 
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> Signed-off-by: Alexey Klimov <alexey.klimov@...aro.org>
> ---
>  .../bindings/sound/qcom,wsa881x-i2c.yaml      | 103 ++++++++++++++++++
>  1 file changed, 103 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/qcom,wsa881x-i2c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/qcom,wsa881x-i2c.yaml b/Documentation/devicetree/bindings/sound/qcom,wsa881x-i2c.yaml
> new file mode 100644
> index 000000000000..51b040b134d2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/qcom,wsa881x-i2c.yaml

Filename must match compatible.

> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/qcom,wsa881x-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm WSA8810/WSA8815 Class-D Smart Speaker Amplifier in Analog mode
> +
> +maintainers:
> +  - Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> +  - Alexey Klimov <alexey.klimov@...aro.org>
> +
> +description: |
> +  WSA8810 is a class-D smart speaker amplifier and WSA8815
> +  is a high-output power class-D smart speaker amplifier.
> +  Their primary operating mode uses a SoundWire digital audio
> +  interface however the amplifier also supports analog mode and it
> +  can be controlled via I2C. This binding is for I2C interface.
> +
> +allOf:
> +  - $ref: dai-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: qcom,qrb4210-wsa881x-i2c-codec

qrb4210 is a name of a board, not codec. i2c is redundant, codec as
well. 'x' is not allowed.

This is qcom,wsa8810 and qcom,wsa8815 compatible with it.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description: Master clock for WSA amplifier
> +    maxItems: 1
> +
> +  clock-names:
> +    description: Master clock name

No, this has to be constrained. Please look how other bindings do it.
Anyway, just drop names, not really useful for one entry.

> +    maxItems: 1
> +
> +  powerdown-gpios:
> +    description: GPIO spec for Powerdown/Shutdown line to use
> +    maxItems: 1
> +
> +  mclk-gpios:
> +    description: GPIO spec for mclk
> +    maxItems: 1
> +
> +  '#sound-dai-cells':
> +    const: 0
> +
> +required:
> +  - compatible
> +  - clocks
> +  - reg
> +  - powerdown-gpios
> +  - mclk-gpios
> +  - "#sound-dai-cells"

Keep consistent quotes, either ' or "

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/sound/qcom,q6afe.h>
> +
> +    i2c0 {

i2c

> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      wsa881x@e {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +        compatible = "qcom,qrb4210-wsa881x-i2c-codec";
> +        reg = <0x0e>;
> +        clocks = <&q6afecc LPASS_CLK_ID_MCLK_3 LPASS_CLK_ATTRIBUTE_COUPLE_NO>;
> +        powerdown-gpios = <&lpass_tlmm 16 GPIO_ACTIVE_LOW>;
> +        mclk-gpios = <&lpass_tlmm 18 GPIO_ACTIVE_HIGH>;
> +        #sound-dai-cells = <0>;
> +      };
> +    };
> +
> +    i2c1 {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +

That's the same example, drop.

Best regards,
Krzysztof