linux-kernel - Re: [PATCH v4 1/2] iio: proximity: provide device tree binding document

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Message-ID: <20200328145533.35f77e48@archlinux>
Date:   Sat, 28 Mar 2020 14:55:33 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Ivan Mikhaylov <i.mikhaylov@...ro.com>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v4 1/2] iio: proximity: provide device tree binding
 document

On Fri, 27 Mar 2020 13:49:53 +0300
Ivan Mikhaylov <i.mikhaylov@...ro.com> wrote:

> Mostly standard i2c driver with some additional led-current option
> for vcnl3020.
> 
> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>

A few things inline.

Thanks,

Jonathan

> ---
>  .../bindings/iio/proximity/vcnl3020.yaml      | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/proximity/vcnl3020.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/proximity/vcnl3020.yaml b/Documentation/devicetree/bindings/iio/proximity/vcnl3020.yaml
> new file mode 100644
> index 000000000000..116aa0e0174d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/proximity/vcnl3020.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/proximity/vcnl3020.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Integrated Proximity Sensor With Infrared Emitter
> +
> +maintainers:
> +  - Ivan Mikhaylov <i.mikhaylov@...ro.com>
> +
> +description: |
> +  The VCNL3020 is a fully integrated proximity sensor. Fully integrated means
> +  that the infrared emitter is included in the package. It has 16-bit
> +  resolution. It includes a signal processing IC and features standard I2C
> +  communication interface. It features an interrupt function.
> +
> +  Specifications about the devices can be found at:
> +  https://www.vishay.com/docs/84150/vcnl3020.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - vishay,vcnl3020
> +
> +  reg:
> +    maxItems: 1
> +
> +  led-current:
> +    description:

Given it has real values, that would be human readable, lets use them!
Also I don't think this is a standard binding so also need a vendor
prefix.

vishay,led-current-microamp taking
0, 10, 20, 30 etc..

Threat it as an enum with all the values listed and we can also enforce
that it is a valid value via the binding.

> +        IR LED current value with valid Range = 0 to 20d. e.g. 0 = 0 mA,
> +        1 = 10 mA, 20 = 200 mA (2 = 20 mA = DEFAULT). LED Current is
> +        limited to 200 mA for values higher than decimal 20.
> +
> +required:
> +  - compatible
> +  - reg
> +  - led-current

You list a default above so is it required?

> +
> +examples:
> +  - |
> +    i2c {
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        iio-proximity@13 {

just proximity.  IIO is a linux concept, devicetree is general.

> +              compatible = "vishay,vcnl3020";
> +              reg = <0x13>;
> +              led-current = <0x14>;
> +        };
> +    };