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

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Message-ID: <124c97ca-0c2c-4b92-8d8e-99d589daf2da@linaro.org>
Date:   Tue, 14 Nov 2023 18:39:09 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Alisa-Dariana Roman <alisadariana@...il.com>
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 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