linux-kernel - Re: [PATCH 2/3] dt-bindings: iio: adc: ad7192: Add AD7194 support

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Date:   Tue, 14 Nov 2023 20:27:41 +0200
From:   Alisa-Dariana Roman <alisadariana@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Alisa-Dariana Roman <alisa.roman@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Maksim Kiselev <bigunclemax@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Cosmin Tanislav <demonsingur@...il.com>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        Marius Cristea <marius.cristea@...rochip.com>,
        Marcus Folkesson <marcus.folkesson@...il.com>,
        Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
        ChiaEn Wu <chiaen_wu@...htek.com>,
        Ivan Mikhaylov <fr0st61te@...il.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: iio: adc: ad7192: Add AD7194 support

On 14.11.2023 19:39, Krzysztof Kozlowski wrote:
> On 14/11/2023 17:02, Alisa-Dariana Roman wrote:
>> On 06.11.2023 10:56, Krzysztof Kozlowski wrote:
>>> On 05/11/2023 20:31, alisadariana@...il.com wrote:
>>>> From: Alisa-Dariana Roman <alisa.roman@...log.com>
>>>>
>>>> Unlike the other AD719Xs, AD7194 has configurable differential
>>>> channels. The default configuration for these channels can be changed
>>>> from the devicetree.
>>>>
>>>> Also add an example for AD7194 devicetree.
>>>>
>>>> Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
>>>> ---
>>>>    .../bindings/iio/adc/adi,ad7192.yaml          | 69 +++++++++++++++++++
>>>>    1 file changed, 69 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
>>>> index 16def2985ab4..b9a9f7b20670 100644
>>>> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
>>>> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
>>>> @@ -21,8 +21,15 @@ properties:
>>>>          - adi,ad7190
>>>>          - adi,ad7192
>>>>          - adi,ad7193
>>>> +      - adi,ad7194
>>>>          - adi,ad7195
>>>>    
>>>> +  '#address-cells':
>>>> +    const: 1
>>>> +
>>>> +  '#size-cells':
>>>> +    const: 0
>>>> +
>>>>      reg:
>>>>        maxItems: 1
>>>>    
>>>> @@ -96,6 +103,31 @@ required:
>>>>      - spi-cpol
>>>>      - spi-cpha
>>>>    
>>>> +patternProperties:
>>>> +  "^channel@([0-9a-f])$":
>>>> +    type: object
>>>> +    $ref: adc.yaml
>>>> +    unevaluatedProperties: false
>>>> +
>>>> +    properties:
>>>> +      reg:
>>>> +        description: The channel index.
>>>> +        minimum: 0
>>>> +        maximum: 7
>>>
>>> Your pattern a bit above is not correct then: [0-7]
>>>
>>>> +
>>>> +      diff-channels:
>>>> +        description: |
>>>> +          The differential channel pair for Ad7194 configurable channels. The
>>>> +          first channel is the positive input, the second channel is the
>>>> +          negative input.
>>>> +        items:
>>>> +          minimum: 1
>>>> +          maximum: 16
>>>> +
>>>> +    required:
>>>> +      - reg
>>>> +      - diff-channels
>>>> +
>>>>    allOf:
>>>>      - $ref: /schemas/spi/spi-peripheral-props.yaml#
>>>>    
>>>> @@ -127,3 +159,40 @@ examples:
>>>>                adi,burnout-currents-enable;
>>>>            };
>>>>        };
>>>> +  - |
>>>> +    spi {
>>>> +        #address-cells = <1>;
>>>> +        #size-cells = <0>;
>>>> +
>>>> +        adc@0 {
>>>> +            #address-cells = <1>;
>>>> +            #size-cells = <0>;
>>>> +            compatible = "adi,ad7194";
>>>> +            reg = <0>;
>>>> +            spi-max-frequency = <1000000>;
>>>> +            spi-cpol;
>>>> +            spi-cpha;
>>>> +            clocks = <&ad7192_mclk>;
>>>> +            clock-names = "mclk";
>>>> +            interrupts = <25 0x2>;
>>>> +            interrupt-parent = <&gpio>;
>>>> +            dvdd-supply = <&dvdd>;
>>>> +            avdd-supply = <&avdd>;
>>>> +            vref-supply = <&vref>;
>>>> +
>>>> +            adi,refin2-pins-enable;
>>>> +            adi,rejection-60-Hz-enable;
>>>> +            adi,buffer-enable;
>>>> +            adi,burnout-currents-enable;
>>>> +
>>>> +            channel@0 {
>>>
>>> Why cannot you add this to the existing example?
>>>
>>>
>>>
>>> Best regards,
>>> Krzysztof
>>>
>> I added another example to highlight the fact that only AD7194 supports
>> configurable channels. How should I proceed?
> 
> Bindings did not tell that, so it seems you miss that part - allOf
> constraining channels per variant.
> 
> Best regards,
> Krzysztof
> 
And should I remove the AD7194 example?

Kind regards,
Alisa-Dariana Roman