linux-kernel - Re: [PATCH 2/5] dt-bindings: add parallax ping sensors

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Message-ID: <20191113141604.GA5040@bogus>
Date:   Wed, 13 Nov 2019 08:16:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andreas Klinger <ak@...klinger.de>
Cc:     jic23@...nel.org, mark.rutland@....com, mripard@...nel.org,
        shawnguo@...nel.org, heiko@...ech.de, icenowy@...c.io,
        laurent.pinchart@...asonboard.com, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, gregkh@...uxfoundation.org,
        christophe.jaillet@...adoo.fr, tglx@...utronix.de,
        mchehab+samsung@...nel.org, davem@...emloft.net,
        paulmck@...ux.ibm.com, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: add parallax ping sensors

On Thu, Nov 07, 2019 at 02:00:29PM +0100, Andreas Klinger wrote:
> Add dt-bindings for parallax PING))) and LaserPING iio sensors, which
> are used for measuring distances.
> 
> Signed-off-by: Andreas Klinger <ak@...klinger.de>
> ---
>  .../bindings/iio/proximity/parallax-ping.yaml      | 51 ++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml b/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
> new file mode 100644
> index 000000000000..ab8dbdf4f04a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/proximity/parallax-ping.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Parallax PING))) and LaserPING range finder
> +
> +maintainers:
> +  - Andreas Klinger <ak@...klinger.de>
> +
> +description: |
> +  Bit-banging driver using one GPIO:
> +  - ping-gpio is raised by the driver to start measurement

ping-gpios or "Ping GPIO"

> +  - direction of ping-gpio is then switched into input with an interrupt
> +    for receiving distance value as PWM signal
> +
> +  Specifications about the devices can be found at:
> +  http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
> +  http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - parallax,ping
> +      - parallax,laserping
> +
> +  ping-gpios:
> +    description:
> +      Definition of the GPIO for the triggering and echo (output and input)
> +      This GPIO is set for about 5 us by the driver to tell the device it
> +      should initiate the measurement cycle. Afterwards the GPIO is switched
> +      to input direction with an interrupt. The device sets it and the
> +      length of the input signal corresponds to the measured distance.
> +      It needs to be an GPIO which is able to deliver an interrupt because
> +      the time between two interrupts is measured in the driver.
> +      See Documentation/devicetree/bindings/gpio/gpio.txt for information
> +      on how to specify a consumer gpio.
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - ping-gpios
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    proximity {
> +        compatible = "parallax,laserping";
> +        ping-gpios = <&gpio0 26 GPIO_ACTIVE_HIGH>;
> +    };
> -- 
> 2.11.0