linux-kernel - Re: [PATCH 1/3] dt-bindings: iio: dac: Add max22007

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Message-ID: <f2537281-f2e0-4194-bc05-cea41ceeba7d@gmail.com>
Date: Wed, 7 Jan 2026 16:13:43 +0100
From: Janani Sunil <jan.sun97@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 Janani Sunil <janani.sunil@...log.com>, Lars-Peter Clausen
 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>,
 Alexandru Ardelean <alexandru.ardelean@...log.com>,
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 jan.sun97@...il.com, gastmaier@...il.com
Subject: Re: [PATCH 1/3] dt-bindings: iio: dac: Add max22007

Hi Krzysztof,

Thank you for reviewing the patch.

On 12/19/25 16:50, Krzysztof Kozlowski wrote:
> On 19/12/2025 16:31, Janani Sunil wrote:
>> Devicetree bindings for MAX22007 4-channel
>> 12-bit DAC that drives a voltage or current
>> output on each channel
> Please wrap commit message according to Linux coding style / submission
> process (neither too early nor over the limit):
> https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597

Noted on the coding guidelines. Shall update the commit message.

>> Signed-off-by: Janani Sunil <janani.sunil@...log.com>
>> ---
>>   .../devicetree/bindings/iio/dac/adi,max22007.yaml  | 116 +++++++++++++++++++++
>>   MAINTAINERS                                        |   7 ++
>>   2 files changed, 123 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,max22007.yaml b/Documentation/devicetree/bindings/iio/dac/adi,max22007.yaml
>> new file mode 100644
>> index 000000000000..c2f65d9e42d4
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/dac/adi,max22007.yaml
>> @@ -0,0 +1,116 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/iio/dac/adi,max22007.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Analog Devices MAX22007 DAC device driver
> Bindings are for hardware, drop all device driver references.

Right. Shall remove the references.

>> +
>> +maintainers:
>> +  - Janani Sunil <janani.sunil@...log.com>
>> +
>> +description:
>> +  The MAX22007 is a quad-channel, 12-bit digital-to-analog converter (DAC)
>> +  with integrated precision output amplifiers and current output capability.
>> +  Each channel can be independently configured for voltage or current output.
>> +  Datasheet available at https://www.analog.com/en/products/max22007.html
>> +
>> +$ref: /schemas/spi/spi-peripheral-props.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: adi,max22007
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  spi-max-frequency:
>> +    maximum: 500000
>> +
>> +  '#address-cells':
>> +    const: 1
>> +
>> +  '#size-cells':
>> +    const: 0
>> +
>> +  vdd-supply:
>> +    description: Low-Voltage Power Supply from +2.7V to +5.5V.
>> +
>> +  hvdd-supply:
>> +    description:
>> +      Positive High-Voltage Power Supply from +8V to (HVSS +24V) for
>> +      the Output Channels.
>> +
>> +  hvss-supply:
>> +    description:
>> +      Negative High-Voltage Power Supply from -2V to 0V for the Output Channels.
>> +
>> +  reset-gpios:
>> +    maxItems: 1
>> +    description:
>> +      GPIO used for hardware reset of the device.
> Drop description, redundant, because not saying anything other than
> schema already said. You could say whether it is active low for example
> if you wanted to add something useful.

Agreed. Will add some information about the GPIO.

>> +
>> +patternProperties:
>> +  "^channel@[0-3]$":
>> +    allOf:
>> +      - $ref: /schemas/iio/dac/dac.yaml#
>> +      - type: object
> Drop allOf. I don't get where did you get this syntax, it's not needed.

Shall remove it.

>> +        description:
>> +          Represents the external channels which are connected to the DAC.
>> +          Channels not specified in the device tree will be powered off.
>> +
>> +        properties:
>> +          reg:
>> +            description: Channel number
>> +            maxItems: 1
>> +
>> +          adi,type:
>> +            description: Channel output type.
>> +            $ref: /schemas/types.yaml#/definitions/string
>> +            enum: [voltage, current]
> Why would it matter if this is voltage or current? That's the first time
> this property appears. Why none of existing fit?

The DAC allows configuring the outputs to be a current/voltage type. The IIO channel names need to change depending on that.
But as per Johnathan's suggestions, I shall reuse the adi,ch-func instead of introducing a new property here.

>> +
>> +        required:
>> +          - reg
>> +          - adi,type
>> +
>> +        unevaluatedProperties: false
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +anyOf:
>> +  - required: [channel@0]
>> +  - required: [channel@1]
>> +  - required: [channel@2]
>> +  - required: [channel@3]
>> +
>> +unevaluatedProperties: false
>
> Best regards,
> Krzysztof


> Best regards,
> Janani Sunil