linux-kernel - Re: [PATCH v2 1/7] dt-bindings: regulator: Add bindings for MediaTek DVFSRC Regulators

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Message-ID: <b728478d-d9c9-4256-aeab-a234316d81cc@collabora.com>
Date: Wed, 17 Apr 2024 17:39:12 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Rob Herring <robh@...nel.org>
Cc: djakov@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, matthias.bgg@...il.com, lgirdwood@...il.com,
 broonie@...nel.org, keescook@...omium.org, gustavoars@...nel.org,
 henryc.chen@...iatek.com, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 kernel@...labora.com, wenst@...omium.org, amergnat@...libre.com
Subject: Re: [PATCH v2 1/7] dt-bindings: regulator: Add bindings for MediaTek
 DVFSRC Regulators

Il 17/04/24 16:52, Rob Herring ha scritto:
> On Wed, Apr 17, 2024 at 11:14:36AM +0200, AngeloGioacchino Del Regno wrote:
>> The Dynamic Voltage and Frequency Scaling Resource Collector Regulators
>> are controlled with votes to the DVFSRC hardware.
>>
>> This adds support for the regulators found in MT6873, MT8183, MT8192
>> and MT8195 SoCs.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>>   .../mediatek,mt6873-dvfsrc-regulator.yaml     | 71 +++++++++++++++++++
>>   1 file changed, 71 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/regulator/mediatek,mt6873-dvfsrc-regulator.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/mediatek,mt6873-dvfsrc-regulator.yaml b/Documentation/devicetree/bindings/regulator/mediatek,mt6873-dvfsrc-regulator.yaml
>> new file mode 100644
>> index 000000000000..446f1dab4d2e
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/regulator/mediatek,mt6873-dvfsrc-regulator.yaml
>> @@ -0,0 +1,71 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/regulator/mediatek,mt6873-dvfsrc-regulator.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: MediaTek DVFSRC-controlled Regulators
>> +
>> +description:
>> +  The Dynamic Voltage and Frequency Scaling Resource Collector Regulators
>> +  are controlled with votes to the DVFSRC hardware.
>> +
>> +maintainers:
>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - mediatek,mt6873-dvfsrc-regulator
>> +      - mediatek,mt8183-dvfsrc-regulator
>> +      - mediatek,mt8192-dvfsrc-regulator
>> +      - mediatek,mt8195-dvfsrc-regulator
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  dvfsrc-vcore:
>> +    description: DVFSRC-controlled SoC Vcore regulator
>> +    $ref: regulator.yaml#
> 
>         unevaluatedProperties: false
> 

Will do!

>> +
>> +  dvfsrc-vscp:
>> +    description: DVFSRC-controlled System Control Processor regulator
>> +    $ref: regulator.yaml#
> 
> ditto
> 
>> +
>> +required:
>> +  - compatible
> 
> 'reg' is never optional. And how is no regulators at all valid?
> 

The two nodes that I'm adding with this series don't need reg, but others
that are not present in this do... but anyway, let's postpone that problem
for the future me, or the future-anyone-else implementing the rest, I will
remove the 'reg' property as it is indeed not needed for this node.

And yeah it's invalid to add that node without any regulator. Will check the
other regulator bindings on how they're doing it.


>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
> 
> Drop the example here. Just one complete example in the MFD doc.
> 

Oki, dropping in v3! That also resolves the circular dependency thing, so
that's even better.

>> +    soc {
>> +        #address-cells = <2>;
>> +        #size-cells = <2>;
>> +
>> +        system-controller@...12000 {
>> +            compatible = "mediatek,mt8195-dvfsrc";
>> +            reg = <0 0x10012000 0 0x1000>;
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +
>> +            regulators@0 {
>> +                compatible = "mediatek,mt8195-dvfsrc-regulator";
>> +                reg = <0>;
> 
> What does 'reg' value represent here? 0 and 1 seem pretty much made up.
> 

Gets removed in v3, tomorrow.

Cheers,
Angelo