linux-kernel - Re: [PATCH v2 2/5] ASoC: dt-bindings: Add tas2781 amplifier

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Date:   Wed, 10 May 2023 09:04:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Shenghao Ding <13916275206@....com>, broonie@...nel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, lgirdwood@...il.com, perex@...ex.cz,
        pierre-louis.bossart@...ux.intel.com
Cc:     kevin-lu@...com, shenghao-ding@...com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, x1077012@...com, peeyush@...com,
        navada@...com, gentuser@...il.com, Ryan_Chu@...tron.com,
        Sam_Wu@...tron.com
Subject: Re: [PATCH v2 2/5] ASoC: dt-bindings: Add tas2781 amplifier

On 08/05/2023 07:45, Shenghao Ding wrote:
> Create tas2781.yaml for tas2781 driver.
> 
> Signed-off-by: Shenghao Ding <13916275206@....com>
> 
> ---
> Changes in v7:

Your subject says it is v2 and previously it was v6. Make it consistent.

>  - Submit together with tas2781 codec driver code

Fix your patchset threading. I don't think it's possible to apply your one.

>  - Add more detail description for ti,audio-slots
>  - Keep consistent for "I2C"
>  - remove reset-gpios description
>  - For reg, express as constraints instead
>  - remove unnecessary '|'
>  Changes to be committed:
> 	new file:   Documentation/devicetree/bindings/sound/ti,tas2781.yaml
> ---
>  .../devicetree/bindings/sound/ti,tas2781.yaml | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/ti,tas2781.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/ti,tas2781.yaml b/Documentation/devicetree/bindings/sound/ti,tas2781.yaml
> new file mode 100644
> index 000000000000..96c2584855d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/ti,tas2781.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2022 - 2023 Texas Instruments Incorporated
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/ti,tas2781.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Texas Instruments TAS2781 SmartAMP
> +
> +maintainers:
> +  - Shenghao Ding <shenghao-ding@...com>
> +
> +description:
> +  The TAS2781 is a mono, digital input Class-D audio amplifier
> +  optimized for efficiently driving high peak power into small
> +  loudspeakers. Integrated an on-chip DSP supports Texas Instruments
> +  Smart Amp speaker protection algorithm. The integrated speaker
> +  voltage and current sense provides for real time
> +  monitoring of loudspeaker behavior.
> +

you miss allOf with ref to saound-dai-common.

> +properties:
> +  compatible:
> +    enum:
> +      - ti,tas2781
> +
> +  reg:
> +    description: I2C address of the primary device.
> +    items:
> +      minimum: 0x38
> +      maximum: 0x3f
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  ti,audio-slots:
> +    description:
> +      Multiple tas2781s aggregate as one Audio Amp to support
> +      multiple audio slots
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    maxItems: 4

You said you can have here two addresses. You don't allow it, test it.

Missing minItems, but...

> +    items:
> +      minimum: 0x38
> +      maximum: 0x3f

... So these are fixed? No need to encode them in such case...

and anyway actually I agree with Rob here - these addresses should be
put in reg.

> +      description:
> +        I2C address of the device for different audio slots,
> +        useless in mono case.
> +
> +  ti,broadcast-addr:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Generic I2C address for all the tas2781 devices in
> +      purpose of I2C broadcast during the multi-device
> +      writes, useless in mono case.

Probably you can figure it out from previous addresses and there is no
need for this property.

> +
> +  '#sound-dai-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +


Best regards,
Krzysztof