[PATCH v5 01/11] dt-bindings: iio: adc: hx711: clean up existing binding text

Piyush Patle
2026-04-29T05:45:57Z

Rewrite the binding description and property text so it describes the
existing HX711 hardware behavior directly instead of documenting old
driver implementation details.

Also clarify that clock-frequency controls the SCK bit-bang timing.

No functional change.

Signed-off-by: Piyush Patle <piyushpatle228@gmail.com>
---
Changes in v5:
- New patch split out of the old combined binding update during review.
- Limit this patch to cleanup of the existing HX711 binding text and the
clock-frequency description.
Changes in v4:
- This cleanup was part of the old combined binding patch.
Changes in v3:
- Restore the example node name to weight and drop the repeated
clock-frequency default wording in the old combined patch.
Changes in v2:
- Remove driver implementation details from the binding description and
clarify clock-frequency as SCK bit-bang timing.
---
.../bindings/iio/adc/avia-hx711.yaml | 25 ++++++++-----------
1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml b/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
index 9c57eb13f892..1ea60dff98d5 100644
--- a/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
@@ -10,14 +10,9 @@ maintainers:
- Andreas Klinger <ak@it-klinger.de>

description: |
- Bit-banging driver using two GPIOs:
- - sck-gpio gives a clock to the sensor with 24 cycles for data retrieval
- and up to 3 cycles for selection of the input channel and gain for the
- next measurement
- - dout-gpio is the sensor data the sensor responds to the clock
-
- Specifications about the driver can be found at:
- http://www.aviaic.com/ENProducts.aspx
+ The HX711 is a 24-bit ADC with selectable gain (32/64/128) and two
+ differential input channels. Channel A supports gain 64 and 128;
+ channel B supports gain 32.

properties:
compatible:
@@ -26,23 +21,23 @@ properties:

sck-gpios:
description:
- Definition of the GPIO for the clock (output). In the datasheet it is
- named PD_SCK
+ GPIO for the clock output (PD_SCK in the datasheet).
maxItems: 1

dout-gpios:
description:
- Definition of the GPIO for the data-out sent by the sensor in
- response to the clock (input).
- See Documentation/devicetree/bindings/gpio/gpio.txt for information
- on how to specify a consumer gpio.
+ GPIO for the data output from the sensor (DOUT in the datasheet).
maxItems: 1

avdd-supply:
description:
- Definition of the regulator used as analog supply
+ Analog supply voltage (AVDD).

clock-frequency:
+ description:
+ Controls the SCK bit-bang timing. The value is used to derive the
+ delay between SCK edges; keep the SCK high time below 60 us to
+ avoid triggering chip power-down mode.
minimum: 20000
maximum: 2500000
default: 400000
--
2.43.0