linux-kernel - Re: [PATCH v2 08/10] dt-bindings: sound: Add support for QMC audio

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Message-ID: <20230110090728.2024b5eb@bootlin.com>
Date:   Tue, 10 Jan 2023 09:07:28 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Li Yang <leoyang.li@....com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Qiang Zhao <qiang.zhao@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 08/10] dt-bindings: sound: Add support for QMC audio

Hi Krzysztof,

On Sun, 8 Jan 2023 16:16:24 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 06/01/2023 17:37, Herve Codina wrote:
> > The QMC (QUICC mutichannel controller) is a controller
> > present in some PowerQUICC SoC such as MPC885.
> > The QMC audio is an ASoC component that uses the QMC
> > controller to transfer the audio data.
> > 
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > ---
> >  .../bindings/sound/fsl,qmc-audio.yaml         | 110 ++++++++++++++++++
> >  1 file changed, 110 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/sound/fsl,qmc-audio.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/sound/fsl,qmc-audio.yaml b/Documentation/devicetree/bindings/sound/fsl,qmc-audio.yaml
> > new file mode 100644
> > index 000000000000..b3774be36c19
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/sound/fsl,qmc-audio.yaml
> > @@ -0,0 +1,110 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/sound/fsl,qmc-audio.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: QMC audio
> > +
> > +maintainers:
> > +  - Herve Codina <herve.codina@...tlin.com>
> > +
> > +description: |
> > +  The QMC audio is an ASoC component which uses QMC (QUICC Multichannel
> > +  Controller) channels to transfer the audio data.
> > +  It provides as many DAI as the number of QMC channel used.
> > +
> > +properties:
> > +  compatible:
> > +    items:  
> 
> Drop items.

Will be dropped.

> 
> > +      - const: fsl,qmc-audio
> > +
> > +  '#address-cells':
> > +    const: 1
> > +  '#size-cells':
> > +    const: 0
> > +  '#sound-dai-cells':
> > +    const: 1
> > +
> > +patternProperties:
> > +  "^dai@([0-9]|[1-5][0-9]|6[0-3])$":
> > +    description:
> > +      A DAI managed by this controller
> > +    type: object
> > +
> > +    properties:
> > +      reg:
> > +        minimum: 0
> > +        maximum: 63
> > +        description:
> > +          The DAI number
> > +
> > +      qmc-chan:  
> 
> Missing vendor prefix.

Will be changed to 'fsl,qmc-chan'

> 
> > +        $ref: /schemas/types.yaml#/definitions/phandle-array  
> 
> Why this is not a phandle?

I have try '$ref: /schemas/types.yaml#/definitions/phandle'

I have an error from make dt_binding_check: 
  dai@16:fsl,qmc-chan:0: [4294967295, 16] is too long

I need a phandle with an argument ie <&qmc 16>.
Is there an alternative to phandle-array to handle this case ?

> 
> > +        description: phandle to the QMC channel> +        maxItems: 1
> > +
> > +    required:
> > +      - reg
> > +      - qmc-chan
> > +
> > +required:
> > +  - compatible
> > +  - '#address-cells'
> > +  - '#size-cells'
> > +  - '#sound-dai-cells'
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    qmc_audio: qmc_audio {  
> 
> Same problem as in previous patch.

Changed to 'audio-controller'.

> 
> > +        compatible = "fsl,qmc-audio";
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +        #sound-dai-cells = <1>;
> > +        dai@16 {
> > +            reg = <16>;
> > +            qmc-chan = <&scc_qmc 16>;
> > +        };
> > +        dai@17 {
> > +            reg = <17>;
> > +            qmc-chan = <&scc_qmc 17>;
> > +        };
> > +    };  
> 
> Best regards,
> Krzysztof
> 

Thanks for the review.

Best regards,
Hervé

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