linux-kernel - Re: [PATCH v4] dt-bindings: iio: accel: add binding documentation for ADIS16240

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Date:   Sat, 23 Nov 2019 11:41:19 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Rodrigo Carvalho <rodrigorsdc@...il.com>
Cc:     alexandru.ardelean@...log.com,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        kernel-usp@...glegroups.com
Subject: Re: [PATCH v4] dt-bindings: iio: accel: add binding documentation
 for ADIS16240

On Sat, 23 Nov 2019 02:19:27 -0300
Rodrigo Carvalho <rodrigorsdc@...il.com> wrote:

> This patch add device tree binding documentation for ADIS16240.
> 
> Signed-off-by: Rodrigo Ribeiro Carvalho <rodrigorsdc@...il.com>
No problem with this patch, but I definitely want to see an accompanying
one enforcing the SPI mode in the driver.

Right now the driver doesn't set it and so I'm fairly sure not putting
it in the binding will leave you with a non working device.

The right option if only one option is supported is for the driver
to call spi_setup with the relevant options.

Thanks,

Jonathan

> ---
> V4:
>    - Remove spi-cpha and spi-cpol in binding example, since this driver
> supports only one timing mode.
>  .../bindings/iio/accel/adi,adis16240.yaml     | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/accel/adi,adis16240.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/accel/adi,adis16240.yaml b/Documentation/devicetree/bindings/iio/accel/adi,adis16240.yaml
> new file mode 100644
> index 000000000000..8e902f7c49e6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/accel/adi,adis16240.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/accel/adi,adis16240.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ADIS16240 Programmable Impact Sensor and Recorder driver
> +
> +maintainers:
> +  - Alexandru Ardelean <alexandru.ardelean@...log.com>
> +
> +description: |
> +  ADIS16240 Programmable Impact Sensor and Recorder driver that supports
> +  SPI interface.
> +    https://www.analog.com/en/products/adis16240.html
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,adis16240
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    spi0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        /* Example for a SPI device node */
> +        accelerometer@0 {
> +            compatible = "adi,adis16240";
> +            reg = <0>;
> +            spi-max-frequency = <2500000>;
> +            interrupt-parent = <&gpio0>;
> +            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> +        };
> +    };