linux-kernel - Re: [PATCH v6 1/9] dt-bindings: regulator: Document MediaTek MT6316 PMIC Regulators

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Message-ID: <c14d80e9-f383-4311-afa7-4d2879e1e4cb@collabora.com>
Date: Thu, 2 Oct 2025 10:01:52 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Rob Herring <robh@...nel.org>
Cc: linux-mediatek@...ts.infradead.org, lee@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, matthias.bgg@...il.com, lgirdwood@...il.com,
 broonie@...nel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 kernel@...labora.com, wenst@...omium.org,
 igor.belwon@...tallysanemainliners.org
Subject: Re: [PATCH v6 1/9] dt-bindings: regulator: Document MediaTek MT6316
 PMIC Regulators

Il 01/10/25 17:45, Rob Herring ha scritto:
> On Wed, Oct 01, 2025 at 01:13:08PM +0200, AngeloGioacchino Del Regno wrote:
>> Add bindings for the regulators found in the MediaTek MT6316 PMIC,
>> usually found in board designs using the MT6991 Dimensity 9400 and
>> on MT8196 Kompanio SoC for Chromebooks.
>>
>> This chip is fully controlled by SPMI and has multiple variants
>> providing different phase configurations.
>>
>> Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
>> Link: https://lore.kernel.org/r/20250715140224.206329-2-angelogioacchino.delregno@collabora.com
> 
> Why do we want a link to v5 here in the git history forever? You've seen
> Linus' recent comments on Link usage?
> 

Yes, I've seen that, and I fully agree with him.

That was a mistake and was totally unintentional - I actually wanted to, but then
forgot to, remove the links.

I really have to spend those 5 minutes to configure b4 correctly.

Sorry about that, will fix in v7.

>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>>   .../regulator/mediatek,mt6316b-regulator.yaml | 46 +++++++++++++++++++
>>   .../regulator/mediatek,mt6316c-regulator.yaml | 46 +++++++++++++++++++
>>   .../regulator/mediatek,mt6316d-regulator.yaml | 41 +++++++++++++++++
>>   3 files changed, 133 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/regulator/mediatek,mt6316b-regulator.yaml
>>   create mode 100644 Documentation/devicetree/bindings/regulator/mediatek,mt6316c-regulator.yaml
>>   create mode 100644 Documentation/devicetree/bindings/regulator/mediatek,mt6316d-regulator.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/mediatek,mt6316b-regulator.yaml b/Documentation/devicetree/bindings/regulator/mediatek,mt6316b-regulator.yaml
>> new file mode 100644
>> index 000000000000..e7a6b70cdab2
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/regulator/mediatek,mt6316b-regulator.yaml
>> @@ -0,0 +1,46 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/regulator/mediatek,mt6316b-regulator.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: MediaTek MT6316 BP/VP SPMI PMIC Regulators
>> +
>> +maintainers:
>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> +
>> +description:
>> +  The MediaTek MT6316BP/VP PMICs are fully controlled by SPMI interface, both
>> +  feature four step-down DC/DC (buck) converters, and provides 2+2 Phases,
>> +  joining Buck 1+2 for the first phase, and Buck 3+4 for the second phase.
>> +
>> +properties:
>> +  compatible:
>> +    const: mediatek,mt6316b-regulator
>> +
>> +  vbuck12:
>> +    type: object
>> +    $ref: regulator.yaml#
>> +    unevaluatedProperties: false
>> +
>> +  vbuck34:
>> +    type: object
>> +    $ref: regulator.yaml#
>> +    unevaluatedProperties: false
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    pmic {
>> +      regulators {
>> +        compatible = "mediatek,mt6316b-regulator";
>> +
>> +        vbuck12 {
>> +          regulator-min-microvolt = <450000>;
>> +          regulator-max-microvolt = <965000>;
>> +          regulator-always-on;
>> +        };
>> +      };
>> +    };
> 
> One complete example for the pmic please rather than incomplete child
> node examples.
> 

Thanks for making me notice - actually, this example is even wrong... as I
eventually changed the node, but for whatever reason I completely forgot
about updating the binding. UGH.

The MT6316(x) are PMICs themselves, providing only regulators.

I'll come up with a decent example.

Cheers,
Angelo