linux-kernel - Re: [PATCH 2/9] ASoC: meson: convert axg tdm interface to schema

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Date:   Fri, 28 Feb 2020 17:57:12 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH 2/9] ASoC: meson: convert axg tdm interface to schema


On Fri 28 Feb 2020 at 16:50, Rob Herring <robh@...nel.org> wrote:

> On Mon, Feb 24, 2020 at 03:58:14PM +0100, Jerome Brunet wrote:
>> Convert the DT binding documentation for the Amlogic tdm interface to
>> schema.
>> 
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> ---
>>  .../bindings/sound/amlogic,axg-tdm-iface.txt  | 22 -------
>>  .../bindings/sound/amlogic,axg-tdm-iface.yaml | 57 +++++++++++++++++++
>>  2 files changed, 57 insertions(+), 22 deletions(-)
>>  delete mode 100644 Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.txt
>>  create mode 100644 Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.yaml
>> 
>> diff --git a/Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.txt b/Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.txt
>> deleted file mode 100644
>> index cabfb26a5f22..000000000000
>> --- a/Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.txt
>> +++ /dev/null
>> @@ -1,22 +0,0 @@
>> -* Amlogic Audio TDM Interfaces
>> -
>> -Required properties:
>> -- compatible: 'amlogic,axg-tdm-iface'
>> -- clocks: list of clock phandle, one for each entry clock-names.
>> -- clock-names: should contain the following:
>> -  * "sclk" : bit clock.
>> -  * "lrclk": sample clock
>> -  * "mclk" : master clock
>> -	     -> optional if the interface is in clock slave mode.
>> -- #sound-dai-cells: must be 0.
>> -
>> -Example of TDM_A on the A113 SoC:
>> -
>> -tdmif_a: audio-controller@0 {
>> -	compatible = "amlogic,axg-tdm-iface";
>> -	#sound-dai-cells = <0>;
>> -	clocks = <&clkc_audio AUD_CLKID_MST_A_MCLK>,
>> -		 <&clkc_audio AUD_CLKID_MST_A_SCLK>,
>> -		 <&clkc_audio AUD_CLKID_MST_A_LRCLK>;
>> -	clock-names = "mclk", "sclk", "lrclk";
>> -};
>> diff --git a/Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.yaml b/Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.yaml
>> new file mode 100644
>> index 000000000000..5f04f9cf30a0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/sound/amlogic,axg-tdm-iface.yaml
>> @@ -0,0 +1,57 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/sound/amlogic,axg-tdm-iface.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Amlogic Audio TDM Interfaces
>> +
>> +maintainers:
>> +  - Jerome Brunet <jbrunet@...libre.com>
>> +
>> +properties:
>> +  $nodename:
>> +    pattern: "^audio-controller-.*"
>> +
>> +  "#sound-dai-cells":
>> +    const: 0
>> +
>> +  compatible:
>> +    items:
>> +      - const: 'amlogic,axg-tdm-iface'
>> +
>> +  clocks:
>> +    minItems: 2
>> +    maxItems: 3
>> +    items:
>> +      - description: Bit clock
>> +      - description: Sample clock
>> +      - description: Master clock #optional
>> +
>> +  clock-names:
>> +    minItems: 2
>> +    maxItems: 3
>> +    items:
>> +      - const: sclk
>> +      - const: lrclk
>> +      - const: mclk
>> +
>> +required:
>> +  - "#sound-dai-cells"
>> +  - compatible
>> +  - clocks
>> +  - clock-names
>
> Add an:
>
> additionalProperties: false

I did not put that on purpose.
Most of the amlogic devices use an generic ASoC property called
"sound-name-prefix"

You may see examples of that in
arch/arm64/boot/dts/amlogic/meson-axg.dtsi.

That property is not expressed in json schema yet, and I don't
really know what is the best way to add that.

Adding 'additionalProperties: false' right now would generate a fair
amount of warning with 'make dtbs_check'

>
> With that,
>
> Reviewed-by: Rob Herring <robh@...nel.org>