linux-kernel - Re: [PATCH v3 2/3] dt-bindings:iio:amplifiers: add ada4250 doc

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Date:   Sun, 20 Feb 2022 11:53:55 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Antoniu Miclaus <antoniu.miclaus@...log.com>, jic23@...nel.org,
        robh+dt@...nel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] dt-bindings:iio:amplifiers: add ada4250 doc

On 14/02/2022 10:41, Antoniu Miclaus wrote:
> Add device tree bindings for the ADA4250 driver.

Please put the bindings patch as first in the series.

> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
>  .../bindings/iio/amplifiers/adi,ada4250.yaml  | 48 +++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml b/Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
> new file mode 100644
> index 000000000000..22283ab48903
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/amplifiers/adi,ada4250.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ADA4250 Programmable Gain Instrumentation Amplifier
> +
> +maintainers:
> +  - Antoniu Miclaus <antoniu.miclaus@...log.com>
> +
> +description: |
> +  Precision Low Power, 110kHz, 26uA, Programmable Gain Instrumentation Amplifier.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ada4250
> +
> +  reg:
> +    maxItems: 1
> +
> +  avdd-supply: true

Needs a description, not a true.

As Jonathan said, you should allow spi-max-frequency (so
spi-max-frequency: true).

No io-channel-cells?

> +
> +  adi,refbuf-enable:
> +    description:
> +      Enable internal buffer to drive the reference pin.
> +    type: boolean
> +
> +required:
> +  - compatible
> +  - reg
> +  - avdd-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      ada4250@0{

Generic node name, so "amplifier".

> +        compatible = "adi,ada4250";
> +        reg = <0>;
> +        avdd-supply = <&avdd>;
> +      };
> +    };
> +...


Best regards,
Krzysztof