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SubjectRe: [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@kernel.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@nxp.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@nxp.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
> >

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