linux-kernel - Re: [PATCH v2 1/7] ASoC: dt-bindings: fsl_rpmsg: Add a property to assign the rpmsg channel

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Date:   Fri, 16 Sep 2022 13:50:48 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chancel Liu <chancel.liu@....com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, shengjiu.wang@...il.com,
        shengjiu.wang@....com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/7] ASoC: dt-bindings: fsl_rpmsg: Add a property to
 assign the rpmsg channel

On Wed, Sep 14, 2022 at 06:51:39PM +0800, Chancel Liu wrote:
> Add a string property to assign the rpmsg channel this sound card sits
> on. It also represents the name of ASoC platform driver. This property
> can be omitted if there is only one sound card and it sits on
> "rpmsg-audio-channel".
> 
> Signed-off-by: Chancel Liu <chancel.liu@....com>
> ---
>  .../devicetree/bindings/sound/fsl,rpmsg.yaml  | 37 ++++++++++++++++++-
>  1 file changed, 35 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,rpmsg.yaml b/Documentation/devicetree/bindings/sound/fsl,rpmsg.yaml
> index d370c98a62c7..3744ae794c00 100644
> --- a/Documentation/devicetree/bindings/sound/fsl,rpmsg.yaml
> +++ b/Documentation/devicetree/bindings/sound/fsl,rpmsg.yaml
> @@ -11,8 +11,11 @@ maintainers:
>  
>  description: |
>    fsl_rpmsg is a virtual audio device. Mapping to real hardware devices
> -  are SAI, DMA controlled by Cortex M core. What we see from Linux
> -  side is a device which provides audio service by rpmsg channel.
> +  are SAI, MICFIL, DMA controlled by Cortex M core. What we see from
> +  Linux side is a device which provides audio service by rpmsg channel.
> +  We can create different sound cards which access different hardwares
> +  such as SAI, MICFIL, .etc through building rpmsg channels between
> +  Cortex-A and Cortex-M.
>  
>  properties:
>    compatible:
> @@ -85,6 +88,17 @@ properties:
>        This is a boolean property. If present, the receiving function
>        will be enabled.
>  
> +  fsl,rpmsg-channel-name:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description: |
> +      A string property to assign rpmsg channel this sound card sits on.
> +      It also represents the name of ASoC platform driver. This property

That's a Linux detail which doesn't belong in DT.

> +      can be omitted if there is only one sound card and it sits on
> +      "rpmsg-audio-channel".
> +    enum:
> +      - rpmsg-audio-channel
> +      - rpmsg-micfil-channel
> +
>  required:
>    - compatible
>    - model
> @@ -107,3 +121,22 @@ examples:
>                   <&clk IMX8MN_AUDIO_PLL2_OUT>;
>          clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
>      };
> +
> +  - |
> +    #include <dt-bindings/clock/imx8mm-clock.h>
> +
> +    rpmsg_micfil: audio-controller {
> +        compatible = "fsl,imx8mm-rpmsg-audio";
> +        model = "micfil-audio";
> +        fsl,rpmsg-channel-name = "rpmsg-micfil-channel";
> +        fsl,enable-lpa;
> +        fsl,rpmsg-in;
> +        clocks = <&clk IMX8MM_CLK_PDM_IPG>,
> +                 <&clk IMX8MM_CLK_PDM_ROOT>,
> +                 <&clk IMX8MM_CLK_SDMA3_ROOT>,
> +                 <&clk IMX8MM_AUDIO_PLL1_OUT>,
> +                 <&clk IMX8MM_AUDIO_PLL2_OUT>;
> +        clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
> +    };
> +
> +...
> -- 
> 2.25.1
> 
>