linux-kernel - Re: [PATCH V3 1/2] ASoC: dt-bindings: fsl_asrc: add compatible string for imx8qm

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Message-ID: <20191114211237.GA25375@bogus>
Date:   Thu, 14 Nov 2019 15:12:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     timur@...nel.org, nicoleotsuka@...il.com, Xiubo.Lee@...il.com,
        festevam@...il.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, devicetree@...r.kernel.org
Subject: Re: [PATCH V3 1/2] ASoC: dt-bindings: fsl_asrc: add compatible
 string for imx8qm

On Mon, Nov 11, 2019 at 05:18:22PM +0800, Shengjiu Wang wrote:
> Add compatible string "fsl,imx8qm-asrc" for imx8qm platform.
> 
> There are two asrc modules in imx8qm, the clock mapping is
> different for each other, so add new property "fsl,asrc-clk-map"
> to distinguish them.

What's the clock mapping?


> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
> changes in v2
> -none
> 
> changes in v3
> -use only one compatible string "fsl,imx8qm-asrc",
> -add new property "fsl,asrc-clk-map".
> 
>  Documentation/devicetree/bindings/sound/fsl,asrc.txt | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,asrc.txt b/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> index 1d4d9f938689..02edab7cf3e0 100644
> --- a/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> +++ b/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> @@ -8,7 +8,8 @@ three substreams within totally 10 channels.
>  
>  Required properties:
>  
> -  - compatible		: Contains "fsl,imx35-asrc" or "fsl,imx53-asrc".
> +  - compatible		: Contains "fsl,imx35-asrc", "fsl,imx53-asrc",
> +			  "fsl,imx8qm-asrc".
>  
>    - reg			: Offset and length of the register set for the device.
>  
> @@ -35,6 +36,13 @@ Required properties:
>  
>     - fsl,asrc-width	: Defines a mutual sample width used by DPCM Back Ends.
>  
> +   - fsl,asrc-clk-map   : Defines clock map used in driver. which is required
> +			  by imx8qm/imx8qxp platform
> +			  <0> - select the map for asrc0 in imx8qm
> +			  <1> - select the map for asrc1 in imx8qm
> +			  <2> - select the map for asrc0 in imx8qxp
> +			  <3> - select the map for asrc1 in imx8qxp

Is this 4 modes of the h/w or just selecting 1 of 4 settings defined in 
the driver? How does one decide? This seems strange.

imx8qxp should perhaps be a separate compatible. Then you only need 1 of 
2 modes...

Rob