linux-kernel - Re: [PATCH v4 4/5] dt-bindings: iio: amplifiers: Add docs for HMC425A Step Attenuator

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Date:   Sun, 2 Feb 2020 10:53:58 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Beniamin Bia <beniamin.bia@...log.com>
Cc:     <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>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 4/5] dt-bindings: iio: amplifiers: Add docs for
 HMC425A Step Attenuator

On Wed, 29 Jan 2020 16:23:00 +0200
Beniamin Bia <beniamin.bia@...log.com> 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  | 48 +++++++++++++++++++
>  1 file changed, 48 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..d800639c14a5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,hmc425a.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/amplifiers/adi,hmc425a.yaml#
> +$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: true
> +
> +  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

Does this force exactly 6?

> +
> +required:
> +  - compatible
> +  - ctrl-gpios
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    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>;
> +    };
> +...