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