linux-kernel - Re: [PATCH v4 2/3] dt-bindings: iio: chemical: add aosong,ags02ma

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Date:   Sat, 25 Nov 2023 12:12:45 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Anshul Dalal <anshulusr@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v4 2/3] dt-bindings: iio: chemical: add aosong,ags02ma

On Sat, 25 Nov 2023 15:31:37 +0530
Anshul Dalal <anshulusr@...il.com> wrote:

> Add bindings for Aosong AGS02MA TVOC sensor.
> 
> The sensor communicates over i2c with the default address 0x1a.
> TVOC values can be read in the units of ppb and ug/m^3 at register 0x00.
> 
> Datasheet:
>   https://asairsensors.com/wp-content/uploads/2021/09/AGS02MA.pdf
> Product-Page:
>   http://www.aosong.com/m/en/products-33.html
> 
> Signed-off-by: Anshul Dalal <anshulusr@...il.com>
> ---
> 
> Changes for v4:
> - Changed node name from 'light-sensor' to 'voc-sensor'
> 
> v3: https://lore.kernel.org/lkml/20231121095800.2180870-2-anshulusr@gmail.com/
> 
> Changes for v3:
> - Fixed commit message
> - Removed "asair,ags02ma" compatible
> 
> v2: https://lore.kernel.org/lkml/20231115125810.1394854-2-anshulusr@gmail.com/
> 
> Changes for v2:
> - Removed device from trivial-devices
> - Added standalone binding with vdd-supply property
> 
> v1: https://lore.kernel.org/lkml/20231107173100.62715-2-anshulusr@gmail.com/
> ---
>  .../bindings/iio/chemical/aosong,ags02ma.yaml | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/chemical/aosong,ags02ma.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/chemical/aosong,ags02ma.yaml b/Documentation/devicetree/bindings/iio/chemical/aosong,ags02ma.yaml
> new file mode 100644
> index 000000000000..c176a6e102ac
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/chemical/aosong,ags02ma.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/chemical/aosong,ags02ma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Aosong AGS02MA VOC Sensor
> +
> +description: |
> +  AGS02MA is an TVOC (Total Volatile Organic Compounds) i2c sensor with default
> +  address of 0x1a.
> +
> +  Datasheet:
> +    https://asairsensors.com/wp-content/uploads/2021/09/AGS02MA.pdf
> +
> +maintainers:
> +  - Anshul Dalal <anshulusr@...il.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aosong,ags02ma
> +
> +  reg:
> +    maxItems: 1
> +
> +  vdd-supply: true

Similar to other review (I put more background there)
Convention these days at least is to always require powersupplies
that the device cannot work with out (even if you can use a fixed
supply and rely on the regulator framework papering over that).
We want to distinguish generally optional supplies from ones we might
not specify in a given DT.

Jonathan

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        voc-sensor@1a {
> +            compatible = "aosong,ags02ma";
> +            reg = <0x1a>;
> +            vdd-supply = <&vdd_regulator>;
> +        };
> +    };