[PATCH v5 03/11] dt-bindings: iio: adc: hx711: add RATE GPIO property

[Piyush Patle <piyushpatle228@gmail.com>]

Document the optional RATE pin GPIO used to select the HX711 output
data rate.

Update the example to show the property in use.

No functional change for existing users.

Signed-off-by: Piyush Patle <piyushpatle228@gmail.com>
---
Changes in v5:
- New patch split out of the old combined binding update during review.
- Document the existing HX711-only RATE GPIO separately and move the
  example update here.
Changes in v4:
- This property and example update were part of the old combined
  binding patch.
Changes in v2:
- Add the optional RATE GPIO property for the HX711 RATE pin.
---
Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml b/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
index a8eaa1f18de5..9134bbe41379 100644
--- a/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
@@ -37,6 +37,13 @@ properties:
     description:
       Supply voltage for the on-chip regulator (VSUP).
 
+  rate-gpios:
+    description:
+      GPIO connected to the RATE pin. When driven low the output data
+      rate is 10 SPS; when driven high it is 80 SPS. If omitted the
+      RATE pin state is determined by the board wiring.
+    maxItems: 1
+
   clock-frequency:
     description:
       Controls the SCK bit-bang timing. The value is used to derive the
@@ -61,6 +68,7 @@ examples:
         compatible = "avia,hx711";
         sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;
         dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
+        rate-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
         avdd-supply = <&avdd>;
         clock-frequency = <100000>;
     };
-- 
2.43.0