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iio: hx711: add clock-frequency property in DT 

Add clock-frequency property for hx711 ADC. This is the frequency of
PD_SCK.

After PD_SCK goes high DOUT is read just before PD_SCK goes down again.
This is necessary because of parasitic capacitance on the wiring.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Andreas Klinger 2018-07-10 20:18:31 +02:00 committed by Jonathan Cameron
parent 382fa58125
commit 7f310e5d07
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
View File

@ -8,11 +8,17 @@ Required properties:
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@0 {
compatible = "avia,hx711";
sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;
dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
avdd-suppy = <&avdd>;
clock-frequency = <100000>;
};