linux-kernel - Re: [PATCH 1/2] dt-bindings: iio: temperature: Add AMS AS6200

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Date:   Sun, 26 Nov 2023 17:30:02 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Abdel Alkuor <alkuor@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: temperature: Add AMS AS6200

On Sat, 11 Nov 2023 17:05:01 -0500
Abdel Alkuor <alkuor@...il.com> wrote:

> as6200 is high accuracy temperature sensor of -/+ 0.4C degree
> with a range between -40C to 125C degrees
> 
Hi Abdel,

Welcome to IIO.  Just one comment on specifying power supplies below.

Jonathan


> Signed-off-by: Abdel Alkuor <alkuor@...il.com>
> ---
>  .../bindings/iio/temperature/ams,as6200.yaml  | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/temperature/ams,as6200.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/temperature/ams,as6200.yaml b/Documentation/devicetree/bindings/iio/temperature/ams,as6200.yaml
> new file mode 100644
> index 000000000000..97a73b92a789
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/temperature/ams,as6200.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/temperature/ams,as6200.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: AMS AS6200 Temperature Sensor
> +
> +maintainers:
> +  - Abdel Alkuor <alkuor@...il.com>
> +
> +description: |
> +  https://ams.com/documents/20143/36005/AS6200_DS000449_4-00.pdf
> +
> +properties:
> +  compatible:
> +    const: ams,as6200
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1

I'd like to see
vdd-supply: true
and it added to teh required list.

The device needs power. Note there is
a devm_regulator_get_enable() function that can then be used in the driver to turn
on any regulator specified in DT which will provide a stub regulator if there isn't
one (not unusual if a fixed power supply is used that is always on).

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        temperature-sensor@48 {
> +            compatible = "ams,as6200";
> +            reg = <0x48>;
> +            interrupt-parent = <&gpio1>;
> +            interrupts = <17 IRQ_TYPE_EDGE_BOTH>;
> +        };
> +    };
> +...