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

["Ding, Shenghao" <shenghao-ding@ti.com>]

Answer· embeded 

-----Original Message-----
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> 
Sent: Wednesday, May 10, 2023 3:04 PM
To: Shenghao Ding <13916275206@139.com>; broonie@kernel.org; devicetree@vger.kernel.org; krzysztof.kozlowski+dt@linaro.org; robh+dt@kernel.org; lgirdwood@gmail.com; perex@perex.cz; pierre-louis.bossart@linux.intel.com
Cc: Lu, Kevin <kevin-lu@ti.com>; Ding, Shenghao <shenghao-ding@ti.com>; alsa-devel@alsa-project.org; linux-kernel@vger.kernel.org; Xu, Baojun <x1077012@ti.com>; Gupta, Peeyush <peeyush@ti.com>; Navada Kanyana, Mukund <navada@ti.com>; gentuser@gmail.com; Ryan_Chu@wistron.com; Sam_Wu@wistron.com
Subject: [EXTERNAL] 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@139.com>
> 
> ---
> Changes in v7:

Your subject says it is v2 and previously it was v6. Make it consistent.
[Ding] v2 is the version no for all of the pathes, in each patch there is separated  version, v7 is the version number for yaml
>  - 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@ti.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.
[Ding] Add it in next patch
> +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.
[DING] if all the put in reg, the i2c_probe will be called several time. The code don not want to register several codecs, but one codec including several tas2781s.

> +      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.
[Ding] this address is the common address for all the tas2781, it can be used for dsp firmware downloading to all the tas2781s in parallel, which can save more downloading time
> +
> +  '#sound-dai-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +


Best regards,
Krzysztof