linux-kernel - Re: [PATCH v5 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

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Message-ID: <CAMknhBHJpOxRmJbiprVNfYB4JbLzjR2a9S8=5iVz_9O+013u1Q@mail.gmail.com>
Date: Sat, 13 Apr 2024 14:29:37 -0500
From: David Lechner <dlechner@...libre.com>
To: Alisa-Dariana Roman <alisadariana@...il.com>
Cc: michael.hennerich@...log.com, linux-iio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	alexandru.tachici@...log.com, lars@...afoo.de, jic23@...nel.org, 
	robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	lgirdwood@...il.com, broonie@...nel.org, andy@...nel.org, nuno.sa@...log.com, 
	marcelo.schmitt@...log.com, bigunclemax@...il.com, okan.sahin@...log.com, 
	fr0st61te@...il.com, alisa.roman@...log.com, marcus.folkesson@...il.com, 
	schnelle@...ux.ibm.com, liambeguin@...il.com
Subject: Re: [PATCH v5 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

On Sat, Apr 13, 2024 at 10:13 AM Alisa-Dariana Roman
<alisadariana@...il.com> wrote:
>
> Unlike the other AD719Xs, AD7194 has configurable differential
> channels. The user can dynamically configure them in 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          | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> index ba506af3b73e..855f0a2d7d75 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
>
> @@ -104,8 +111,43 @@ required:
>    - spi-cpol
>    - spi-cpha
>
> +patternProperties:
> +  "^channel@[0-9]+$":
> +    type: object
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +
> +    properties:
> +      reg:
> +        description: The channel index.
> +        minimum: 1
> +        maximum: 256
> +
> +      diff-channels:
> +        description: |
> +          Both inputs can be connected to pins AIN1 to AIN16 by choosing the
> +          appropriate value from 1 to 16.
> +        items:
> +          minimum: 1
> +          maximum: 16

Don't we also need to allow 0 for AINCOM here? Or is this property
only for fully differential pairs and not pseudo-differential pairs?


> +
> +    required:
> +      - reg
> +      - diff-channels
> +
>  allOf:
>    - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - adi,ad7190
> +            - adi,ad7192
> +            - adi,ad7193
> +            - adi,ad7195
> +    then:
> +      patternProperties:
> +        "^channel@[0-9]+$": false
>
>  unevaluatedProperties: false
>
> @@ -136,3 +178,35 @@ 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>;
> +
> +            channel@1 {
> +                reg = <1>;
> +                diff-channels = <1 6>;
> +            };
> +
> +            channel@2 {
> +                reg = <2>;
> +                diff-channels = <16 5>;
> +            };
> +        };
> +    };
> --
> 2.34.1
>