avia-hx711.yaml: transform DT binding to YAML

* AVIA HX711 ADC chip for weight cells

  Bit-banging driver

Required properties:

 - compatible:	Should be "avia,hx711"

 - sck-gpios:	Definition of the GPIO for the clock

 - dout-gpios:	Definition of the GPIO for data-out

		See Documentation/devicetree/bindings/gpio/gpio.txt

 - avdd-supply:	Definition of the regulator used as analog supply

Optional properties:

 - clock-frequency:	Frequency of PD_SCK in Hz

			Minimum value allowed is 10 kHz because of maximum

			high time of 50 microseconds.

Example:

weight {

	compatible = "avia,hx711";

	sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;

	dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;

	avdd-suppy = <&avdd>;

	clock-frequency = <100000>;

};

# SPDX-License-Identifier: GPL-2.0

%YAML 1.2

---

$id: "http://devicetree.org/schemas/iio/adc/avia-hx711.yaml#"

$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: AVIA HX711 ADC chip for weight cells

maintainers:

  - Andreas Klinger <ak@it-klinger.de>

description: |

  Bit-banging driver using two GPIOs:

  - sck-gpio gives a clock to the sensor with 24 cycles for data retrieval

    and up to 3 cycles for selection of the input channel and gain for the

    next measurement

  - dout-gpio is the sensor data the sensor responds to the clock

  Specifications about the driver can be found at:

  http://www.aviaic.com/ENProducts.aspx

properties:

  compatible:

    enum:

      - avia,hx711

  sck-gpios:

    description:

      Definition of the GPIO for the clock (output). In the datasheet it is

      named PD_SCK

    maxItems: 1

  dout-gpios:

    description:

      Definition of the GPIO for the data-out sent by the sensor in

      response to the clock (input).

      See Documentation/devicetree/bindings/gpio/gpio.txt for information

      on how to specify a consumer gpio.

    maxItems: 1

  avdd-supply:

    description:

      Definition of the regulator used as analog supply

    maxItems: 1

  clock-frequency:

    minimum: 20000

    maximum: 2500000

    default: 400000

required:

  - compatible

  - sck-gpios

  - dout-gpios

  - avdd-supply

examples:

  - |

    #include <dt-bindings/gpio/gpio.h>

    weight {

        compatible = "avia,hx711";

        sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;

        dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;

        avdd-suppy = <&avdd>;

        clock-frequency = <100000>;

    };