linux-kernel - Re: [PATCH 1/3] dt-bindings: iio: pressure: Add Sensirion SDP500

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Date: Tue, 16 Jan 2024 16:37:13 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC: Petar Stoykov <pd.pstoykov@...il.com>, <linux-iio@...r.kernel.org>,
	Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
	Rob Herring <robh+dt@...nel.org>, Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>, Angel Iglesias
	<ang.iglesiasg@...il.com>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: iio: pressure: Add Sensirion SDP500

On Tue, 16 Jan 2024 16:31:55 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 16/01/2024 16:24, Petar Stoykov wrote:
> > Sensirion SDP500 is a digital differential pressure sensor. It provides
> > a digital I2C output. Add devicetree bindings requiring the compatible
> > string and I2C slave address (reg).
> > 
> > Signed-off-by: Petar Stoykov <pd.pstoykov@...il.com>
> > ---
> >  .../bindings/iio/pressure/sdp500.yaml         | 38 +++++++++++++++++++
> >  1 file changed, 38 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/pressure/sdp500.yaml  
> 
> Filename like compatible.
> 
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/pressure/sdp500.yaml
> > b/Documentation/devicetree/bindings/iio/pressure/sdp500.yaml
> > new file mode 100644
> > index 000000000000..af01ec7e3802
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/pressure/sdp500.yaml
> > @@ -0,0 +1,38 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/pressure/sdp500.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: sdp500/sdp510 pressure sensor with I2C bus interface
> > +
> > +maintainers:
> > +  - Petar Stoykov <pd.pstoykov@...il.com>
> > +
> > +description: |  
> 
> Do not need '|' unless you need to preserve formatting.
> 
> > +  Pressure sensor from Sensirion with I2C bus interface.
> > +  There is no software difference between sdp500 and sdp510.
> > +
> > +properties:
> > +  compatible:
> > +    const: sensirion,sdp500
> > +  
> 
> No resources? No interrupts? No power supply or any pins? No even
> iio-cells? This looks incomplete.

For a pressure sensors, io-channel-cells (which I guess you me you
mean) would be a new thing. We've never yet had a consumer of this
data type...  Not necessarily a bad thing to have as one can
conceive of one, but none of the current pressure sensor bindings
have that.

vdd-supply though definitely wants to be in here and required
given device is unlikely to work without power!

Jonathan


> 
> > +  reg:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c3 {  
> 
> i2c {
> 
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      sdp500@40 {  
> 
> Node names should be generic. See also an explanation and list of
> examples (not exhaustive) in DT specification:
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
> 
> 
> 
> Best regards,
> Krzysztof
> 
>