linux-kernel - Re: [PATCH v5] ASoC: dt-bindings: Add tas2781 amplifier

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Date:   Fri, 3 Feb 2023 15:57:24 -0600
From:   Rob Herring <robh@...nel.org>
To:     Shenghao Ding <13916275206@....com>
Cc:     krzysztof.kozlowski+dt@...aro.org, broonie@...nel.org,
        lgirdwood@...il.com, kevin-lu@...com, shenghao-ding@...com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] ASoC: dt-bindings: Add tas2781 amplifier

On Fri, Feb 03, 2023 at 12:01:15PM +0800, Shenghao Ding wrote:
> Create tas2781.yaml for tas2781 driver.
> 
> Signed-off-by: Shenghao Ding <13916275206@....com>
> 
> ---
> Changes in v5:
>  - Drop the full stop in the Subject.
>  - Drop the reset-gpios reference to gpio.txt.
>  - Add Changelog.
>  Changes to be committed:
> 	new file:   Documentation/devicetree/bindings/sound/ti,tas2781.yaml
> ---
>  .../devicetree/bindings/sound/ti,tas2781.yaml | 87 +++++++++++++++++++
>  1 file changed, 87 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..8af44792a904
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/ti,tas2781.yaml
> @@ -0,0 +1,87 @@
> +# 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>
> +  - Kevin Lu <kevin-lu@...com>
> +
> +description: |

Don't need '|' unless you need line endings preserved. Wrap lines at 80 
chars.

> +  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.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,tas2781
> +
> +  reg:
> +    maxItems: 1
> +    description: |
> +      I2C address of the device can be in range from 0x38 to 0x40.

Express as constraints instead:

items:
  minimum: 0x38
  maximum: 0x40

Or was this the range of the slot addresses?

> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: |
> +      A GPIO line handling reset of the chip. As the line is active high,
> +      it should be marked GPIO_ACTIVE_HIGH.

The description doesn't add anything. Drop.

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  ti,audio-slots:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 4
> +    description: |
> +      I2c address of the device for different audio slots,

I2C

> +      useless in mono case.
> +
> +  ti,broadcast-addr:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Generic i2c address for all the tas2781 devices in

I2C

Be consistent.

> +      purpose of I2C broadcast during the multi-device
> +      writes, useless in mono case.
> +
> +  '#sound-dai-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +   #include <dt-bindings/gpio/gpio.h>
> +   i2c {
> +     /* example with quad support, such as tablet or pad device */
> +     #address-cells = <1>;
> +     #size-cells = <0>;
> +     quad: codec@38 {
> +       compatible = "ti,tas2781";
> +       reg = <0x38>;
> +       #sound-dai-cells = <1>;
> +       reset-gpios = < &gpio1 10 GPIO_ACTIVE_HIGH >;
> +       interrupt-parent = <&gpio1>;
> +       interrupts = <15>;
> +       ti,audio-slots = < 0x38 /* topleft-channel */
> +                          0x39 /* topright-channel */
> +                          0x3a /* bottomleft-channel */
> +                          0x3b /* bottomright-channel */

Do these vary? Or the slot addresses are fixed and which slots are used 
varies? 

> +                        >;
> +       ti,broadcast-addr = <0x40>;

I tend to think the I2C addresses should all be in 'reg'.

> +     };
> +   };
> +...
> -- 
> 2.34.1
> 
>