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

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Message-ID: <20230111175527.10289d16@bootlin.com>
Date:   Wed, 11 Jan 2023 17:55:27 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     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>, 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 Wed, 11 Jan 2023 17:28:11 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> 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.

Ok, I will drop it in v2.

> 
> > +  - $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.

Ok, I will change in v2.

> 
> > +
> > +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.

Indeed, I wanted to show the dai-tdm properties.
But ok, I will drop the node.

> 
> 
> Best regards,
> Krzysztof
> 

Thanks for the review.

Best regards,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com