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Date:   Sat, 25 Apr 2020 20:23:41 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Tomasz Duszynski <tomasz.duszynski@octakon.com>
Cc:     <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <robh+dt@kernel.org>
Subject: Re: [PATCH 5/6] dt-bindings: iio: scd30: add device binding file
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In-Reply-To: <20200422141135.86419-6-tomasz.duszynski@octakon.com>
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        <20200422141135.86419-6-tomasz.duszynski@octakon.com>
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On Wed, 22 Apr 2020 16:11:34 +0200
Tomasz Duszynski <tomasz.duszynski@octakon.com> wrote:

> Add SCD30 sensor binding file.
> 
> Signed-off-by: Tomasz Duszynski <tomasz.duszynski@octakon.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.

> +%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@octakon.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?

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