linux-kernel - Re: [PATCH 1/4] dt-bindings: iio: adc: sd modulator: add vref support

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Message-ID: <20200208160454.0f153bfb@archlinux>
Date:   Sat, 8 Feb 2020 16:04:54 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Olivier Moysan <olivier.moysan@...com>
Cc:     <robh+dt@...nel.org>, <mark.rutland@....com>, <knaack.h@....de>,
        <lars@...afoo.de>, <devicetree@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <pmeerw@...erw.net>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/4] dt-bindings: iio: adc: sd modulator: add vref
 support

On Tue, 4 Feb 2020 11:10:05 +0100
Olivier Moysan <olivier.moysan@...com> wrote:

> Add vref supply support to sigma delta modulator.
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@...com>
> ---
>  .../devicetree/bindings/iio/adc/sigma-delta-modulator.yaml    | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
> index a390343d0c2a..2afe0765e971 100644
> --- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
> @@ -8,6 +8,7 @@ title: Device-Tree bindings for sigma delta modulator
>  
>  maintainers:
>    - Arnaud Pouliquen <arnaud.pouliquen@...com>
> +  - Olivier Moysan <olivier.moysan@...com>
>  
>  properties:
>    compatible:
> @@ -21,6 +22,9 @@ properties:
>    '#io-channel-cells':
>      const: 0
>  
> +  vref-supply:
> +    description: Phandle to the vref input analog reference voltage.
I note this in review of patch 2 but in general I'm not sure we should
be introducing this for generic devices.   It's fine if we have an
explicit compatible but there is no reason to assume a generic sd-modulator
uses an external reference.

Jonathan

> +
>  required:
>    - compatible
>    - '#io-channel-cells'