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Date: Tue, 4 Jun 2024 14:24:35 +0200
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Subject: Re: [PATCH v1 1/4] dt-bindings: iio: adc: Add MediaTek MT6359 PMIC
 AUXADC
To: Krzysztof Kozlowski <krzk@kernel.org>, jic23@kernel.org
Cc: lars@metafoo.de, robh@kernel.org, krzk+dt@kernel.org,
 conor+dt@kernel.org, matthias.bgg@gmail.com, lee@kernel.org,
 andy@kernel.org, nuno.sa@analog.com, bigunclemax@gmail.com,
 dlechner@baylibre.com, marius.cristea@microchip.com,
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 mike.looijmans@topic.nl, marcus.folkesson@gmail.com,
 linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-mediatek@lists.infradead.org, kernel@collabora.com
References: <20240530093410.112716-1-angelogioacchino.delregno@collabora.com>
 <20240530093410.112716-2-angelogioacchino.delregno@collabora.com>
 <c2b97c8e-177e-4169-b001-ab0e3303734f@kernel.org>
 <dc46258b-caf9-46a7-84b4-2f229d48b8f7@collabora.com>
 <0d7d9f61-2590-4c72-9498-dc6540b571d5@kernel.org>
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
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Il 04/06/24 11:38, Krzysztof Kozlowski ha scritto:
> On 04/06/2024 10:55, AngeloGioacchino Del Regno wrote:
>> Il 01/06/24 17:32, Krzysztof Kozlowski ha scritto:
>>> On 30/05/2024 11:34, AngeloGioacchino Del Regno wrote:
>>>> Add a new binding for the MT6350 Series (MT6357/8/9) PMIC AUXADC,
>>>> providing various ADC channels for both internal temperatures and
>>>> voltages, audio accessory detection (hp/mic/hp+mic and buttons,
>>>> usually on a 3.5mm jack) other than some basic battery statistics
>>>> on boards where the battery is managed by this PMIC.
>>>>
>>>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>>>> ---
>>>>    .../iio/adc/mediatek,mt6359-auxadc.yaml       | 43 +++++++++++++++++++
>>>>    .../iio/adc/mediatek,mt6357-auxadc.h          | 21 +++++++++
>>>>    .../iio/adc/mediatek,mt6358-auxadc.h          | 22 ++++++++++
>>>>    .../iio/adc/mediatek,mt6359-auxadc.h          | 22 ++++++++++
>>>>    4 files changed, 108 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
>>>>    create mode 100644 include/dt-bindings/iio/adc/mediatek,mt6357-auxadc.h
>>>>    create mode 100644 include/dt-bindings/iio/adc/mediatek,mt6358-auxadc.h
>>>>    create mode 100644 include/dt-bindings/iio/adc/mediatek,mt6359-auxadc.h
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml b/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
>>>> new file mode 100644
>>>> index 000000000000..dd6c331905cf
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
>>>> @@ -0,0 +1,43 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/iio/adc/mediatek,mt6359-auxadc.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: MediaTek MT6350 series PMIC AUXADC
>>>> +
>>>> +maintainers:
>>>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>>>> +
>>>> +description:
>>>> +  The Auxiliary Analog/Digital Converter (AUXADC) is an ADC found
>>>> +  in some MediaTek PMICs, performing various PMIC related measurements
>>>> +  such as battery and PMIC internal voltage regulators temperatures,
>>>> +  accessory detection resistance (usually, for a 3.5mm audio jack)
>>>> +  other than voltages for various PMIC internal components.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    enum:
>>>> +      - mediatek,mt6357-auxadc
>>>> +      - mediatek,mt6358-auxadc
>>>> +      - mediatek,mt6359-auxadc
>>>> +
>>>> +  "#io-channel-cells":
>>>> +    const: 1
>>>> +
>>>> +additionalProperties: false
>>>
>>> If there is going to be a re-spin, please move this below required: block.
>>>
>>
>> Yep, will do. Fixed up for v2.
>>
>>>> +
>>>> +required:
>>>> +  - compatible
>>>> +  - "#io-channel-cells"
>>>> +
>>>> +examples:
>>>> +  - |
>>>> +    pmic {
>>>> +        pmic_adc: adc {
>>>> +            compatible = "mediatek,mt6359-auxadc";
>>>> +            #io-channel-cells = <1>;
>>>> +        };
>>>
>>> This suggests that you should grow (make complete) the parent PMIC example.
>>
>> Uhm, should I instead add that to bindings/mfd/mediatek,mt6357.yaml and avoid
>> growing the parent example?
> 
> No. You should avoid this example and grow the parent example. Not avoid
> parent example...
> 

I will remove examples from here and move the example that I wrote in here
to mediatek,mt6357.yaml.

>>
>>     adc:
>>       type: object
>>       $ref: /schemas/iio/adc/mediatek,mt6359-auxadc.yaml
>>       unevaluatedProperties: false
>>
>>>
>>> Actually having this as a separate node is not really needed. Why it
>>> cannot be just part of the MFD/parent node?
>>>
>>
>> (glossary: PWRAP = PMIC [SPI] WRAPper)
>>
>> The top node is the PWRAP, an IP that is (mostly) used to dispatch commands to
>> the PMIC, but the AUXADC is not integrated into the PWRAP, but into the PMIC.
> 
> Eh? mediatek,mt6357.yaml says it is a PMIC...
> 

Eh, apparently my brain cells are somewhere else today.
I was thinking about the HW, and some synapse got disconnected in the process, lol.

Just pretend I never wrote this useless wall of text, sorry. Ugh :-)

Cheers,
Angelo