linux-kernel - Re: [PATCH 5/6] dt-bindings: iio: scd30: add device binding file

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Message-ID: <20200426082825.GA3282@arch>
Date:   Sun, 26 Apr 2020 10:28:25 +0200
From:   Tomasz Duszynski <tomasz.duszynski@...akon.com>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     Tomasz Duszynski <tomasz.duszynski@...akon.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <robh+dt@...nel.org>
Subject: Re: [PATCH 5/6] dt-bindings: iio: scd30: add device binding file

On Sat, Apr 25, 2020 at 08:23:41PM +0100, Jonathan Cameron wrote:
> On Wed, 22 Apr 2020 16:11:34 +0200
> Tomasz Duszynski <tomasz.duszynski@...akon.com> wrote:
>
> > Add SCD30 sensor binding file.
> >
> > Signed-off-by: Tomasz Duszynski <tomasz.duszynski@...akon.com>
> > ---
> >  .../iio/chemical/sensirion,scd30.yaml         | 71 +++++++++++++++++++
> >  1 file changed, 71 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/chemical/sensirion,scd30.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/iio/chemical/sensirion,scd30.yaml b/Documentation/devicetree/bindings/iio/chemical/sensirion,scd30.yaml
> > new file mode 100644
> > index 000000000000..b092b2530c76
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/chemical/sensirion,scd30.yaml
> > @@ -0,0 +1,71 @@
> > +# SPDX-License-Identifier: GPL-2.0
>
> Dual license preferred with BSD for bindings.
>

Okay.

> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/chemical/sensirion,scd30.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Sensirion SCD30 carbon dioxide sensor
> > +
> > +maintainers:
> > +  - Tomasz Duszynski <tomasz.duszynski@...akon.com>
> > +
> > +description: |
> > +  Air quality sensor capable of measuring co2 concentration, temperature
> > +  and relative humidity.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - sensirion,scd30
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  vdd-supply: true
> > +
> > +  sensirion,sel-gpios:
> > +    description: GPIO connected to the SEL line
> > +    maxItems: 1
> > +
> > +  sensirion,pwm-gpios:
> > +    description: GPIO connected to the PWM line
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - vdd-supply
>
> Only enable it I think in the driver.  Should be fine with a stub regulator
> as provided if we don't specify one in the dt binding because it's not
> controllable and we are lazy.
>
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    # include <dt-bindings/gpio/gpio.h>
> > +    # include <dt-bindings/interrupt-controller/irq.h>
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      scd30@61 {
> > +        compatible = "sensirion,scd30";
> > +        reg = <0x61>;
> > +        vdd-supply = <&vdd>;
> > +        interrupt-parrent = <&gpio0>;
> > +        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> > +      };
> > +    };
> > +  - |
> > +    # include <dt-bindings/gpio/gpio.h>
>
> Why gpio?
>

That shouldn't be here. I have some local changes where I use sel-gpios hence
this include.

> > +    # include <dt-bindings/interrupt-controller/irq.h>
> > +    serial {
> > +      scd30 {
> > +        compatible = "sensirion,scd30";
> > +        vdd-supply = <&vdd>;
> > +        interrupt-parrent = <&gpio0>;
> > +        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> > +      };
> > +    };
> > +
> > +...
>