linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: accel: Add binding documentation for ADXL313

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Date:   Fri, 6 Aug 2021 21:33:44 -0300
From:   Lucas Stankus <lucas.p.stankus@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        "Berghe, Darius" <Darius.Berghe@...log.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: accel: Add binding documentation
 for ADXL313

On Fri, Aug 6, 2021 at 3:10 PM Rob Herring <robh@...nel.org> wrote:
>
> On Thu, Aug 05, 2021 at 03:29:37AM -0300, Lucas Stankus wrote:
> > Add device tree binding documentation for ADXL313 3-axis accelerometer.
> >
> > Signed-off-by: Lucas Stankus <lucas.p.stankus@...il.com>
> > ---
> >  .../bindings/iio/accel/adi,adxl313.yaml       | 90 +++++++++++++++++++
> >  1 file changed, 90 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml b/Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml
> > new file mode 100644
> > index 000000000000..fea03b6790f3
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml
> > @@ -0,0 +1,90 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/accel/adi,adxl313.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analog Devices ADXL313 3-Axis Digital Accelerometer
> > +
> > +maintainers:
> > +  - Lucas Stankus <lucas.p.stankus@...il.com>
> > +
> > +description: |
> > +  Analog Devices ADXL313 3-Axis Digital Accelerometer that supports
> > +  both I2C & SPI interfaces.
> > +    https://www.analog.com/en/products/adxl313.html
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - adi,adxl313
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  spi-3wire: true
> > +
> > +  spi-cpha: true
> > +
> > +  spi-cpol: true
>
> These 3 generally shouldn't be needed, but can be set from the driver.
> If they are valid, is any combination of them really valid?
>

Only the 3wire is optional, both cpha and cpol are required for proper
spi connection.

> > +
> > +  spi-max-frequency: true
> > +
> > +  vs-supply:
> > +    description: Regulator that supplies power to the accelerometer
> > +
> > +  vdd-supply:
> > +    description: Regulator that supplies the digital interface supply voltage
> > +
> > +  interrupts:
> > +    maxItems: 2
>
> This means there must be 2 entries. If 1 is valid, you need 'minItems'.
>

I'll add 'minItems' for the v3 then, thanks!

> > +
> > +  interrupt-names:
> > +    maxItems: 2
>
> You need 'minItems' too to fix the error.
>

Thank you again and sorry for not catching that error before submitting.

> > +    items:
> > +      enum:
> > +        - INT1
> > +        - INT2
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/gpio/gpio.h>
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +    i2c0 {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        /* Example for a I2C device node */
> > +        accelerometer@53 {
> > +            compatible = "adi,adxl313";
> > +            reg = <0x53>;
> > +            interrupt-parent = <&gpio0>;
> > +            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> > +            interrupt-names = "INT1";
> > +        };
> > +    };
> > +  - |
> > +    #include <dt-bindings/gpio/gpio.h>
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +    spi {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        /* Example for a SPI device node */
> > +        accelerometer@0 {
> > +            compatible = "adi,adxl313";
> > +            reg = <0>;
> > +            spi-max-frequency = <5000000>;
> > +            spi-cpol;
> > +            spi-cpha;
> > +            interrupt-parent = <&gpio0>;
> > +            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> > +            interrupt-names = "INT1";
> > +        };
> > +    };
> > --
> > 2.32.0
> >
> >