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Date:   Sun, 20 Feb 2022 11:48:16 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Antoniu Miclaus <antoniu.miclaus@...log.com>, robh+dt@...nel.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] dt-bindings:iio:amplifiers: add ada4250 doc

On Sun, 20 Feb 2022 11:53:55 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> wrote:

> On 14/02/2022 10:41, Antoniu Miclaus wrote:
> > Add device tree bindings for the ADA4250 driver.  
> 
> Please put the bindings patch as first in the series.
> 
> > 
> > Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> > ---
> >  .../bindings/iio/amplifiers/adi,ada4250.yaml  | 48 +++++++++++++++++++
> >  1 file changed, 48 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml b/Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
> > new file mode 100644
> > index 000000000000..22283ab48903
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
> > @@ -0,0 +1,48 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/amplifiers/adi,ada4250.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ADA4250 Programmable Gain Instrumentation Amplifier
> > +
> > +maintainers:
> > +  - Antoniu Miclaus <antoniu.miclaus@...log.com>
> > +
> > +description: |
> > +  Precision Low Power, 110kHz, 26uA, Programmable Gain Instrumentation Amplifier.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - adi,ada4250
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  avdd-supply: true  
> 
> Needs a description, not a true.

For a generic supply where all we really have is a name, I'm not sure
a description adds anything.  Of course, if there is more info that can be provided
a description is great to have.

> 
> As Jonathan said, you should allow spi-max-frequency (so
> spi-max-frequency: true).
> 
> No io-channel-cells?

I'm not sure you'd have a consumer of this type of device, so
it may not make sense...

> 
> > +
> > +  adi,refbuf-enable:
> > +    description:
> > +      Enable internal buffer to drive the reference pin.
> > +    type: boolean
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - avdd-supply
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    spi {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      ada4250@0{  
> 
> Generic node name, so "amplifier".
> 
> > +        compatible = "adi,ada4250";
> > +        reg = <0>;
> > +        avdd-supply = <&avdd>;
> > +      };
> > +    };
> > +...  
> 
> 
> Best regards,
> Krzysztof

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