linux-kernel - Re: [PATCH v2 2/3] dt-bindings: iio: amplifiers: Add docs for HMC425A Step Attenuator

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Date:   Mon, 27 Jan 2020 14:16:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Beniamin Bia <beniamin.bia@...log.com>
Cc:     jic23@...nel.org, lars@...afoo.de, Michael.Hennerich@...log.com,
        pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, biabeniamin@...look.com,
        knaack.h@....de, mark.rutland@....com, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/3] dt-bindings: iio: amplifiers: Add docs for
 HMC425A Step Attenuator

On Wed, Jan 22, 2020 at 02:17:01PM +0200, Beniamin Bia wrote:
> From: Michael Hennerich <michael.hennerich@...log.com>
> 
> Document support for Analog Devices MC425A Step Attenuator.
> 
> Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
> Signed-off-by: Beniamin Bia <beniamin.bia@...log.com>
> ---
>  .../bindings/iio/amplifiers/adi,hmc425a.yaml  | 56 +++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/amplifiers/adi,hmc425a.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/amplifiers/adi,hmc425a.yaml b/Documentation/devicetree/bindings/iio/amplifiers/adi,hmc425a.yaml
> new file mode 100644
> index 000000000000..a0afa661f4ac
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,hmc425a.yaml
> @@ -0,0 +1,56 @@
> +# SPDX-License-Identifier: GPL-2.0

Dual license new bindings:

(GPL-2.0-only OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/amplifiers/adi,hmc425a.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HMC425A 6-bit Digital Step Attenuator
> +
> +maintainers:
> +- Michael Hennerich <michael.hennerich@...log.com>
> +- Beniamin Bia <beniamin.bia@...log.com>
> +
> +description: |
> +  Digital Step Attenuator IIO device with gpio interface.
> +  HMC425A 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/hmc425A.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,hmc425a
> +
> +  vcc-supply:
> +    description:
> +      Digital voltage regulator (see regulator/regulator.txt)
> +    maxItems: 1

All supplies are a single entry, so drop this. Really, 
'vcc-supply: true' is sufficient.

> +
> +  ctrl-gpios:
> +    description:
> +      Must contain an array of 6 GPIO specifiers, referring to the GPIO pins
> +      connected to the control pins V1-V6.
> +    maxItems: 6
> +
> +required:
> +  - compatible
> +  - ctrl-gpios
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    gpio {
> +      #address-cells = <1>;
> +      #size-cells = <0>;

GPIO clients are not child nodes of GPIO controllers, so you can remove 
this node.

> +      gpio_hmc425a: hmc425a {
> +        compatible = "adi,hmc425a";
> +        ctrl-gpios = <&gpio 40 GPIO_ACTIVE_HIGH>,
> +          <&gpio 39 GPIO_ACTIVE_HIGH>,
> +          <&gpio 38 GPIO_ACTIVE_HIGH>,
> +          <&gpio 37 GPIO_ACTIVE_HIGH>,
> +          <&gpio 36 GPIO_ACTIVE_HIGH>,
> +          <&gpio 35 GPIO_ACTIVE_HIGH>;
> +
> +        vcc-supply = <&foo>;
> +      };
> +    };
> +...
> -- 
> 2.17.1
>