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Message-ID: <20191123143454.68f4d4a5@archlinux>
Date: Sat, 23 Nov 2019 14:34:54 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Andreas Klinger <ak@...klinger.de>
Cc: robh+dt@...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 v3 2/4] dt-bindings: add parallax ping sensors
On Mon, 18 Nov 2019 08:36:12 +0100
Andreas Klinger <ak@...klinger.de> 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>
> Reviewed-by: Rob Herring <robh@...nel.org>
Applied to the togreg branch of iio.git and pushed out as testing.
Thanks,
Jonathan
> ---
> .../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..a079c9921af6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
> +%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-gpios is raised by the driver to start measurement
> + - 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>;
> + };
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