linux-kernel - Re: [PATCH v6 03/16] dt-bindings: mfd: mediatek: Add codec property for MT6357 PMIC

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Date: Tue, 25 Jun 2024 11:23:02 +0200
From: Alexandre Mergnat <amergnat@...libre.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Lee Jones <lee@...nel.org>, Flora Fu <flora.fu@...iatek.com>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v6 03/16] dt-bindings: mfd: mediatek: Add codec property
 for MT6357 PMIC



On 21/06/2024 17:00, Krzysztof Kozlowski wrote:
> On 19/06/2024 16:46, Alexandre Mergnat wrote:
>> Add the audio codec sub-device. This sub-device is used to set the
>> optional voltage values according to the hardware.
>> The properties are:
>>    - Setup of microphone bias voltage.
>>    - Setup of the speaker pin pull-down.
>>
>> Also, add the audio power supply property which is dedicated for
>> the audio codec sub-device.
>>
>> Signed-off-by: Alexandre Mergnat<amergnat@...libre.com>
>> ---
>>   .../devicetree/bindings/mfd/mediatek,mt6357.yaml   | 33 ++++++++++++++++++++++
>>   1 file changed, 33 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml
>> index 37423c2e0fdf..d95307393e75 100644
>> --- a/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml
>> @@ -37,6 +37,32 @@ properties:
>>     "#interrupt-cells":
>>       const: 2
>>   
>> +  vaud28-supply:
>> +    description: 2.8 volt supply phandle for the audio codec
>> +
>> +  audio-codec:
>> +    type: object
> Still not much improved. You do not have any resources there, so these
> should go to the parent node.

Hi Krzysztof,

vaud28-supply seems to be a mistake that I forward port.
In the V4, AFAII, your feedback [1] suggested me to move the vaud28-supply from the "audio-codec" 
sub-node to the parent node, which for me is the "pmic" (mfd), because the property is considered as 
power-supply.

     pwrap {
         pmic {
             ...
             audio-codec {
                 ...

Hardware side, vaud28-supply is the output of PMIC-regulator subsystem, and AVDD28 is the input of 
PMIC-audio-codec subsystem. Then:
- The property name is wrong and must be change to AVDD28, which is a consumer (power input), not a 
power-supply. => description: 2.8 volt power input for microphones (AU_VIN0, AU_VIN1, AU_VIN2)
- IMHO, move this property to the next parent (pwrap) isn't consistent. It should be moved back to 
Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml (Done in the V4) into audio-codec 
substystem, beside mediatek,micbias0-microvolt

Does this sound good to you ?

-- 
Regards,
Alexandre