linux-kernel - Re: [PATCH] dt-bindings: iio: adc: ti,adc081c: Document the binding

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Message-ID: <e4be94a3-cdfc-cdf8-5d69-0eef480033f9@linaro.org>
Date:   Sun, 27 Nov 2022 13:51:19 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Samuel Holland <samuel@...lland.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: iio: adc: ti,adc081c: Document the binding

On 25/11/2022 23:09, Samuel Holland wrote:
> Linux has a driver for these ADCs at drivers/iio/adc/ti-adc081c.c, but
> the compatible strings were undocumented. Add a binding for them. The
> hardware has an alert interrupt output, but existing ti,adc081c users
> do not provide the 'interrupts' property, so leave it as optional.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> 
>  .../bindings/iio/adc/ti,adc081c.yaml          | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,adc081c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,adc081c.yaml b/Documentation/devicetree/bindings/iio/adc/ti,adc081c.yaml
> new file mode 100644
> index 000000000000..caaad777580c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,adc081c.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,adc081c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI Single-channel I2C ADCs
> +
> +maintainers:
> +  - Jonathan Cameron <jic23@...nel.org>
> +  - Lars-Peter Clausen <lars@...afoo.de>
> +
> +description: |
> +  Single-channel ADC supporting 8, 10, or 12-bit samples and high/low alerts.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,adc081c
> +      - ti,adc101c
> +      - ti,adc121c
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  vref-supply:
> +    description:
> +      Regulator for the combined power supply and voltage reference
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg

Why not requiring io-channel-cells? If it is an IIO ADC provider, you
need the cells, right?

Best regards,
Krzysztof