linux-kernel - Re: [PATCH 1/3] dt-bindings: rockchip: Add rk809 support for rk817 audio codec

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Date: Wed, 17 Jan 2024 20:37:45 +1100
From: Tim Lunn <tim@...thertop.org>
To: Rob Herring <robh@...nel.org>
Cc: linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, Chris Zhong <zyw@...k-chips.com>,
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Lee Jones <lee@...nel.org>, Zhang Qing <zhangqing@...k-chips.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: rockchip: Add rk809 support for rk817
 audio codec

Hi Rob,

On 1/17/24 06:37, Rob Herring wrote:
> On Tue, Jan 16, 2024 at 07:46:16PM +1100, Tim Lunn wrote:
>> Rockchip RK809 shares the same audio codec as the rk817 mfd, it is also
>> using the same rk817_codec driver. However it is missing from the
>> bindings.
>>
>> Update dt-binding documentation for rk809 to include the audio codec
>> properties. This fixes the following warning from dtb check:
>>
>> pmic@20: '#sound-dai-cells', 'assigned-clock-parents', 'assigned-clocks',
>>     'clock-names', 'clocks', 'codec' do not match any of the regexes:
>>     'pinctrl-[0-9]+'
>>
>> Signed-off-by: Tim Lunn <tim@...thertop.org>
>> ---
>>
>>   .../bindings/mfd/rockchip,rk809.yaml          | 30 ++++++++++++++++++-
>>   1 file changed, 29 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/rockchip,rk809.yaml b/Documentation/devicetree/bindings/mfd/rockchip,rk809.yaml
>> index 839c0521f1e5..bac2e751e2f2 100644
>> --- a/Documentation/devicetree/bindings/mfd/rockchip,rk809.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/rockchip,rk809.yaml
>> @@ -12,7 +12,7 @@ maintainers:
>>   
>>   description: |
>>     Rockchip RK809 series PMIC. This device consists of an i2c controlled MFD
>> -  that includes regulators, an RTC, and power button.
>> +  that includes regulators, an RTC, a power button, and an audio codec.
>>   
>>   properties:
>>     compatible:
>> @@ -93,6 +93,34 @@ properties:
>>           unevaluatedProperties: false
>>       unevaluatedProperties: false
>>   
>> +  clocks:
>> +    description:
>> +      The input clock for the audio codec.
> How many clocks? (maxItems: 1)
>
> You can drop the description.
Yes just 1 clock, i will fix this.
>
>> +
>> +  clock-names:
>> +    description:
>> +      The clock name for the codec clock.
> Drop.
Just drop the description? I dont think can drop the clock names as the 
driver use the name to lookup clock:

devm_clk_get(pdev->dev.parent, "mclk");
>
>> +    items:
>> +      - const: mclk
>> +
>> +  '#sound-dai-cells':
>> +    description:
>> +      Needed for the interpretation of sound dais.
> Common property, don't need the description.
Ok
>
>> +    const: 0
>> +
>> +  codec:
>> +    description: |
>> +      The child node for the codec to hold additional properties. If no
>> +      additional properties are required for the codec, this node can be
>> +      omitted.
> Why do you need a child node here? Just put the 1 property in the parent
> node.
This is how the existing rk817 codec driver was setup. I suppose it was 
copied from downstream, where there are more properties than just the 
one. I don't know if there was any intention (or need) to implement 
those other properties.
>
>> +    type: object
>> +    additionalProperties: false
>> +    properties:
>> +      rockchip,mic-in-differential:
>> +        type: boolean
>> +        description:
>> +          Describes if the microphone uses differential mode.
>> +
>>   allOf:
>>     - if:
>>         properties:
>> -- 
>> 2.40.1
>>