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
7 title: AVIA HX711 ADC chip for weight cells
8
9 maintainers:
10 - Andreas Klinger <ak@it-klinger.de>
11
12 description: |
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
22 properties:
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
50 required:
51 - compatible
52 - sck-gpios
53 - dout-gpios
54 - avdd-supply
55
56 additionalProperties: false
57
58 examples:
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 };
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