linux-kernel - Re: [PATCH 1/3] dt-bindings: sound: Add Renesas IDT821034 codec

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Message-ID: <c4497bde-c1e0-1efc-7a46-233495f7760b@linaro.org>
Date:   Wed, 11 Jan 2023 17:28:11 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Herve Codina <herve.codina@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/3] dt-bindings: sound: Add Renesas IDT821034 codec

On 11/01/2023 14:49, Herve Codina wrote:
> The Renesas IDT821034 codec is a quad PCM codec with
> programmable gain.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> ---
>  .../bindings/sound/renesas,idt821034.yaml     | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/renesas,idt821034.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/renesas,idt821034.yaml b/Documentation/devicetree/bindings/sound/renesas,idt821034.yaml
> new file mode 100644
> index 000000000000..2c29b770e3f7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/renesas,idt821034.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/renesas,idt821034.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas IDT821034 codec device
> +
> +maintainers:
> +  - Herve Codina <herve.codina@...tlin.com>
> +
> +description: |
> +  The IDT821034 codec is a four channel PCM codec with onchip filters and
> +  programmable gain setting.
> +
> +  The time-slots used by the codec must be set and so, the properties
> +  'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
> +  'dai-tdm-slot-rx-mask' must be present in the ALSA sound card node for
> +  sub-nodes that involve the codec. The codec uses one 8bit time-slot per
> +  channel.
> +  'dai-tdm-tdm-slot-with' must be set to 8.
> +
> +  The IDT821034 codec also supports 5 gpios (SLIC signals) per channel.
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +  - $ref: /schemas/gpio/gpio.yaml#

This one is never needed. Drop.

> +  - $ref: dai-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: renesas,idt821034
> +
> +  reg:
> +    description:
> +      SPI device address.
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 8192000
> +
> +  spi-cpha: true
> +
> +  '#sound-dai-cells':
> +    const: 0
> +
> +  '#gpio-cells':
> +    const: 2
> +
> +  gpio-controller: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - spi-cpha
> +  - '#sound-dai-cells'
> +  - gpio-controller
> +  - '#gpio-cells'
> +
> +additionalProperties: false

This should be rather unevaluatedProperties: false, so other properties
from spi-props and dai-common will work.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        codec: idt821034@0 {

Node names should be generic, so "audio-codec"
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +            compatible = "renesas,idt821034";
> +            reg = <0>;
> +            spi-max-frequency = <8192000>;
> +            spi-cpha;
> +            #sound-dai-cells = <0>;
> +            gpio-controller;
> +            #gpio-cells = <2>;
> +        };
> +    };
> +    sound {
> +        compatible = "simple-audio-card";

Drop sound{} node. Not relevant to the case here and it's the same in
every case of audio codec... unless something here is specific. But even
the dai-tdm properties are sound card specific.


Best regards,
Krzysztof