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iio: hx711: add clock-frequency property in DT

PATCH Applied Andreas Klinger 3 participants 3 messages Jul 10, 2018 – Jul 15, 2018

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Andreas Klinger

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#0 lore raw

PATCH v5 1/3 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 <[email protected]>
---
 Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 6 ++++++
 1 file changed, 6 insertions(+)
Documentation/devicetree/bindings/iio/adc/avia-hx711.txt +6 -0
index b3629405f568..2c1b67d33c49 100644
@@ -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>;
 };
Signature · 1 line
2.1.4
maintainer Reviewed-by on v5 1/3
#1 lore raw
Quoted 10 lines · Andreas Klinger

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 <[email protected]>
---
 Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 6 ++++++
 1 file changed, 6 insertions(+)
Reviewed-by Rob Herring <[email protected]>
maintainer
#2 lore raw
Quoted 7 lines · On Wed, 11 Jul 2018 07:54:00 -0600 Rob Herring <[email protected]> wrote:
Quoted 6 lines · Andreas Klinger

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.

Quoted 6 lines
Quoted 4 lines
Signed-off-by Andreas Klinger <[email protected]>
---
 Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 6 ++++++
 1 file changed, 6 insertions(+)
Reviewed-by Rob Herring <[email protected]>

Applied to the togreg branch of iio.git and pushed out as testing.

Thanks,

Jonathan

Quoted 4 lines

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