linux-kernel - Re: [PATCH 1/5] ASoC: dt-bindings: fsl_rpmsg: Add a property to assign platform driver name

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Message-ID: <f614f968-baf4-6b4d-507e-29221e1469bc@linaro.org>
Date:   Tue, 30 Aug 2022 12:28:32 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Chancel Liu <chancel.liu@....com>, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, shengjiu.wang@....com,
        Xiubo.Lee@...il.com, festevam@...il.com, nicoleotsuka@...il.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/5] ASoC: dt-bindings: fsl_rpmsg: Add a property to
 assign platform driver name

On 29/08/2022 10:51, Chancel Liu wrote:
> Add a string property to assign ASoC platform driver name. It also
> represents the rpmsg channel this sound card sits on. 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  | 34 +++++++++++++++++--
>  1 file changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,rpmsg.yaml b/Documentation/devicetree/bindings/sound/fsl,rpmsg.yaml
> index d370c98a62c7..35e3cb9f768b 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 +88,14 @@ properties:
>        This is a boolean property. If present, the receiving function
>        will be enabled.
>  
> +  fsl,platform:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description: |
> +      A string property to assign ASoC platform driver name. 

No, this is not a property of hardware. Naming of some drivers in some
systems does not fit DTS and bindings.

> It also
> +      represents the rpmsg channel this sound card sits on. This property
> +      can be omitted if there is only one sound card and it sits on
> +      "rpmsg-audio-channel".
> +
>  required:
>    - compatible
>    - model
> @@ -107,3 +118,22 @@ examples:
>                   <&clk IMX8MN_AUDIO_PLL2_OUT>;
>          clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
>      };
> +
> +  - |
> +    #include <dt-bindings/clock/imx8mm-clock.h>
> +
> +    rpmsg_micfil: rpmsg_micfil {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Also: no underscores in node names.

Best regards,
Krzysztof