linux-kernel - Re: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add lt3074

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Message-ID: <0898bd3f-a613-491d-a5e4-a66019aa72e2@roeck-us.net>
Date: Mon, 7 Apr 2025 15:59:09 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 Cedric Encarnacion <cedricjustine.encarnacion@...log.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Jean Delvare <jdelvare@...e.com>,
 Jonathan Corbet <corbet@....net>,
 Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add lt3074

On 2/26/25 00:20, Krzysztof Kozlowski wrote:
> On Tue, Feb 25, 2025 at 09:01:13PM +0800, Cedric Encarnacion wrote:
>> Add Analog Devices LT3074 Ultralow Noise, High PSRR Dropout Linear
>> Regulator.
>>
>> Signed-off-by: Cedric Encarnacion <cedricjustine.encarnacion@...log.com>
>> ---
>>   .../bindings/hwmon/pmbus/adi,lt3074.yaml           | 64 ++++++++++++++++++++++
>>   MAINTAINERS                                        |  7 +++
>>   2 files changed, 71 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,lt3074.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/adi,lt3074.yaml
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..714426fd655a8daa96e15e1f789743f36001ac7a
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,lt3074.yaml
>> @@ -0,0 +1,64 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/hwmon/pmbus/adi,lt3074.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Analog Devices LT3074 voltage regulator
>> +
>> +maintainers:
>> +  - Cedric Encarnacion <cedricjustine.encarnacion@...log.com>
>> +
>> +description: |
>> +  The LT3074 is a low voltage, ultra-low noise and ultra-fast transient
>> +  response linear regulator. It allows telemetry for input/output voltage,
>> +  output current and temperature through the PMBus serial interface.
>> +
>> +  Datasheet:
>> +    https://www.analog.com/en/products/lt3074.html
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - adi,lt3074
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  regulators:
>> +    type: object
>> +    description: |
>> +      list of regulators provided by this controller.
> 
> You have only one regulator, so drop the "regulators". vout could be
> here, but since you do not have any other resources, I doubt it stands
> on its own either. This is even visible in your DTS - you named the
> device as regulator, so logically this is the regulator. Regulator does
> not have regulators (otherwise they could also have regulators... so
> triple regulator).
> 
> hwmon code might need some changes, but that's not really relevant for
> proper hardware description.
> 

With the changes in the hwmon pmbus code now in linux-next, this should
be ready for another revision with non-nested regulator support.

Thanks,
Guenter