linux-kernel - Re: [PATCH v6 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

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Message-ID: <20240418144019.GA1581398-robh@kernel.org>
Date: Thu, 18 Apr 2024 09:40:19 -0500
From: Rob Herring <robh@...nel.org>
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,
	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, dlechner@...libre.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 v6 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

On Wed, Apr 17, 2024 at 08:00:53PM +0300, Alisa-Dariana Roman 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          | 77 +++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> index cf5c568f140a..7e4e15e4e648 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
>  
> @@ -89,6 +96,30 @@ properties:
>      description: see Documentation/devicetree/bindings/iio/adc/adc.yaml
>      type: boolean
>  
> +patternProperties:
> +  "^channel@[0-9a-z]+$":

Unit-addresses are hex (typically). So something like:

'^channel@(100|[0-9a-f]{1,2})$'

> +    type: object
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +
> +    properties:
> +      reg:
> +        description: The channel index.
> +        minimum: 1
> +        maximum: 256

Why not 0 based?


> +
> +      diff-channels:
> +        description: |

Don't need '|' if no formatting.

> +          Both inputs can be connected to pins AIN1 to AIN16 by choosing the
> +          appropriate value from 1 to 16.
> +        items:
> +          minimum: 1
> +          maximum: 16
> +
> +    required:
> +      - reg
> +      - diff-channels

Single ended modes aren't supported?

> +
>  required:
>    - compatible
>    - reg
> @@ -103,6 +134,17 @@ required:
>  
>  allOf:
>    - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - adi,ad7190
> +            - adi,ad7192
> +            - adi,ad7193
> +            - adi,ad7195
> +    then:
> +      patternProperties:
> +        "^channel@[0-9a-z]+$": false
>  
>  unevaluatedProperties: false
>  
> @@ -133,3 +175,38 @@ examples:
>              adi,burnout-currents-enable;
>          };
>      };
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@0 {
> +            compatible = "adi,ad7194";
> +            reg = <0>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            spi-max-frequency = <1000000>;
> +            spi-cpol;
> +            spi-cpha;
> +            clocks = <&ad7192_mclk>;
> +            clock-names = "mclk";
> +            interrupts = <25 0x2>;
> +            interrupt-parent = <&gpio>;
> +            aincom-supply = <&aincom>;
> +            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
>