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# 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
clock-frequency:
minimum: 20000
maximum: 2500000
default: 400000
required:
- compatible
- sck-gpios
- dout-gpios
- avdd-supply
additionalProperties: false
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-supply = <&avdd>;
clock-frequency = <100000>;
};
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