linux-kernel - Re: [PATCH 2/3] dt-bindings:iio:frequency: add admv1014 doc

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Date:   Sun, 9 Jan 2022 17:46:33 +0000
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc:     <robh+dt@...nel.org>, <linux-iio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings:iio:frequency: add admv1014 doc

On Mon, 3 Jan 2022 11:22:00 +0200
Antoniu Miclaus <antoniu.miclaus@...log.com> wrote:

binding rather than doc.  Yaml is code a well as documentation afterall.

> Add device tree bindings for the ADMV1014 Upconverter.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
>  .../bindings/iio/frequency/adi,admv1014.yaml  | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/frequency/adi,admv1014.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/frequency/adi,admv1014.yaml b/Documentation/devicetree/bindings/iio/frequency/adi,admv1014.yaml
> new file mode 100644
> index 000000000000..a3e5e61c8ade
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/frequency/adi,admv1014.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/frequency/adi,admv1014.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ADMV1014 Microwave Downconverter
> +
> +maintainers:
> +  - Antoniu Miclaus <antoniu.miclaus@...log.com>
> +
> +description: |
> +   Wideband, microwave downconverter optimized for point to point microwave
> +   radio designs operating in the 24 GHz to 44 GHz frequency range.
> +
> +   https://www.analog.com/en/products/admv1014.html
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,admv1014
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 1000000
> +
> +  clocks:
> +    description:
> +      Definition of the external clock.

Not a particularly helpful way of describing it.  
This is the local oscillator input.  I'd put the description
in clock-names rather than here as then it's obvious what lo_in
means.

> +    minItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: lo_in
> +
> +  vcm-supply:
> +    description:
> +      Analog voltage regulator.

There seem to be a whole load of other VCC_X supplies from the datasheet.
They should all be here. 

> +
> +  adi,input-mode:
> +    description:
> +      Select the input mode.
> +      iq - in-phase quadrature (I/Q) input
> +      if - complex intermediate frequency (IF) input
> +    enum: [iq, if]
> +
> +  adi,detector-enable:
> +    description:
> +      Digital Rx Detector Enable. The Square Law Detector output is
> +      available at output pin VDET.
> +    type: boolean
> +
> +  adi,p1db-comp-enable:
> +    description:
> +      Turn on bits to optimize P1dB.

Expand comp to compensation perhaps as not a totally clear abbreviation.

> +    type: boolean
> +
> +  adi,quad-se-mode:
> +    description:
> +      Switch the LO path from differential to single-ended operation.
> +      se-neg - Single-Ended Mode, Negative Side Disabled.
> +      se-pos - Single-Ended Mode, Positive Side Disabled.
> +      diff - Differential Mode.
> +    enum: [se-neg, se-pos, diff]
> +
> +  '#clock-cells':
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - vcm-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      admv1014@0{
> +        compatible = "adi,admv1014";
> +        reg = <0>;
> +        spi-max-frequency = <1000000>;
> +        clocks = <&admv1014_lo>;
> +        clock-names = "lo_in";
> +        vcm-supply = <&vcm>;
> +        adi,quad-se-mode = "diff";
> +        adi,detector-enable;
> +        adi,p1db-comp-enable;
> +      };
> +    };
> +...