xref: /linux/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/iio/adc/avia-hx711.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: AVIA HX711 ADC chip for weight cells
8
9maintainers:
10  - Andreas Klinger <ak@it-klinger.de>
11
12description: |
13  Bit-banging driver using two GPIOs:
14  - sck-gpio gives a clock to the sensor with 24 cycles for data retrieval
15    and up to 3 cycles for selection of the input channel and gain for the
16    next measurement
17  - dout-gpio is the sensor data the sensor responds to the clock
18
19  Specifications about the driver can be found at:
20  http://www.aviaic.com/ENProducts.aspx
21
22properties:
23  compatible:
24    enum:
25      - avia,hx711
26
27  sck-gpios:
28    description:
29      Definition of the GPIO for the clock (output). In the datasheet it is
30      named PD_SCK
31    maxItems: 1
32
33  dout-gpios:
34    description:
35      Definition of the GPIO for the data-out sent by the sensor in
36      response to the clock (input).
37      See Documentation/devicetree/bindings/gpio/gpio.txt for information
38      on how to specify a consumer gpio.
39    maxItems: 1
40
41  avdd-supply:
42    description:
43      Definition of the regulator used as analog supply
44
45  clock-frequency:
46    minimum: 20000
47    maximum: 2500000
48    default: 400000
49
50required:
51  - compatible
52  - sck-gpios
53  - dout-gpios
54  - avdd-supply
55
56additionalProperties: false
57
58examples:
59  - |
60    #include <dt-bindings/gpio/gpio.h>
61    weight {
62        compatible = "avia,hx711";
63        sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;
64        dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
65        avdd-supply = <&avdd>;
66        clock-frequency = <100000>;
67    };
68