linux-kernel - Re: [PATCH v2 7/7] ASoC: dt-bindings: imx-rpmsg: Add binding doc for rpmsg machine driver

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Message-ID: <CAA+D8ANOv91jr4381Acz1B2mZ6=Mx2J_2CMTGXmPKztv7bMjPA@mail.gmail.com>
Date:   Thu, 18 Feb 2021 15:23:29 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, alsa-devel@...a-project.org,
        Timur Tabi <timur@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Xiubo Li <Xiubo.Lee@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH v2 7/7] ASoC: dt-bindings: imx-rpmsg: Add binding doc for
 rpmsg machine driver

On Thu, Feb 11, 2021 at 6:18 AM Rob Herring <robh@...nel.org> wrote:
>
> On Sun, Feb 07, 2021 at 06:23:55PM +0800, Shengjiu Wang wrote:
> > Imx-rpmsg is a new added machine driver for supporting audio on Cortex-M
> > core. The Cortex-M core will control the audio interface, DMA and audio
> > codec, setup the pipeline, the audio driver on Cortex-A core side is just
> > to communitcate with M core, it is a virtual sound card and don't touch
> > the hardware.
>
> I don't understand why there are 2 nodes for this other than you happen
> to want to split this into 2 Linux drivers. It's 1 h/w thing.

This one is for the sound card machine driver.  Another one is
for the sound card cpu dai driver. so there are 2 nodes.

>
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > ---
> >  .../bindings/sound/imx-audio-rpmsg.yaml       | 48 +++++++++++++++++++
> >  1 file changed, 48 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/sound/imx-audio-rpmsg.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/sound/imx-audio-rpmsg.yaml b/Documentation/devicetree/bindings/sound/imx-audio-rpmsg.yaml
> > new file mode 100644
> > index 000000000000..b941aeb80678
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/sound/imx-audio-rpmsg.yaml
> > @@ -0,0 +1,48 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/sound/imx-audio-rpmsg.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: NXP i.MX audio complex with rpmsg
> > +
> > +maintainers:
> > +  - Shengjiu Wang <shengjiu.wang@....com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - fsl,imx-audio-rpmsg
> > +
> > +  model:
> > +    $ref: /schemas/types.yaml#/definitions/string
> > +    description: User specified audio sound card name
> > +
> > +  audio-cpu:
> > +    description: The phandle of an CPU DAI controller
> > +
> > +  rpmsg-out:
> > +    description: |
> > +      This is a boolean property. If present, the transmitting function
> > +      will be enabled,
> > +
> > +  rpmsg-in:
> > +    description: |
> > +      This is a boolean property. If present, the receiving function
> > +      will be enabled.
> > +
> > +required:
> > +  - compatible
> > +  - model
> > +  - audio-cpu
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    sound-rpmsg {
> > +        compatible = "fsl,imx-audio-rpmsg";
> > +        model = "ak4497-audio";
> > +        audio-cpu = <&rpmsg_audio>;
> > +        rpmsg-out;
> > +    };
> > --
> > 2.27.0
> >