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

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Message-ID: <500eec71-e2f4-4f43-8bc9-6d4914b2493c@gmail.com>
Date:   Tue, 14 Nov 2023 18:02:30 +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 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?

Kind regards,
Alisa-Dariana Roman