linux-kernel - Re: [PATCH v2 1/3] dt-bindings: iio: pressure: Add Sensirion SDP500

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Date: Wed, 1 May 2024 14:06:12 +0200
From: Petar Stoykov <pd.pstoykov@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: linux-iio@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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>, Conor Dooley <conor+dt@...nel.org>, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: iio: pressure: Add Sensirion SDP500

On Tue, Apr 30, 2024 at 6:50 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Tue, Apr 30, 2024 at 05:27:20PM +0200, Petar Stoykov wrote:
> > From 60f5cc7f65b07124f19428a713c3bc33b9e4a7a7 Mon Sep 17 00:00:00 2001
> > From: Petar Stoykov <pd.pstoykov@...il.com>
> > Date: Mon, 15 Jan 2024 14:29:25 +0100
> > Subject: [PATCH 1/3] dt-bindings: iio: pressure: Add Sensirion SDP500
> >
> > 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>
> > ---
> >  .../iio/pressure/sensirion,sdp500.yaml        | 39 +++++++++++++++++++
> >  1 file changed, 39 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/iio/pressure/sensirion,sdp500.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/iio/pressure/sensirion,sdp500.yaml
> > b/Documentation/devicetree/bindings/iio/pressure/sensirion,sdp500.yaml
> > new file mode 100644
> > index 000000000000..3cdf17df7d52
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/pressure/sensirion,sdp500.yaml
> > @@ -0,0 +1,39 @@
> > +# 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: |
> > +  Pressure sensor from Sensirion with I2C bus interface.
> > +  There is no software difference between sdp500 and sdp510.
>
> I see no mention of the sdp510 elsewhere in this patch though..
> If you're trying to add support for both, then add a compatible for the
> sdp510 that falls back to the sdp500.
>

Fair point. Our focus is on the SDP500. SDP510 is the same software-wise so
I just mention it but I agree that I should add it as compatible in the code.

> > +
> > +properties:
> > +  compatible:
> > +    const: sensirion,sdp500
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
>
> Other than the fact that a fallback compatible might be required here,
> this looks like a candidate for trivial-devices.yaml.

This sounds like a more serious comment. We will definitely continue using
this driver internally for now. But do you think it's still worth adding
it as a separate driver instead of leaving it for "trivial-devices"?
It has been a useful driver for us so we thought it is worth sharing.

>
> Cheers,
> Conor.
>
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      pressure@40 {
> > +        compatible = "sensirion,sdp500";
> > +        reg = <0x40>;
> > +        vdd-supply = <&foo>;
> > +      };
> > +    };
> > --
> > 2.30.2