[PATCH 1/5] Documentation: dt: iio: document stm32 adc trigger polarity

[Fabrice Gasnier]

STM32 ADC trigger polarity can be set to either rising, falling
or both edges. Allow to configure it from dt.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier at st.com>
---
 Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
index 5dfc88e..6c6d968 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
@@ -57,6 +57,8 @@ Optional properties:
 - dmas: Phandle to dma channel for this ADC instance.
   See ../../dma/dma.txt for details.
 - dma-names: Must be "rx" when dmas property is being used.
+- st,trigger-polarity: Must be 0 (default), 1 or 2 to set default trigger
+  polarity to respectively "rising-edge", "falling-edge" or "both-edges".
 
 Example:
 	adc: adc at 40012000 {
@@ -84,6 +86,7 @@ Example:
 			st,adc-channels = <8>;
 			dmas = <&dma2 0 0 0x400 0x0>;
 			dma-names = "rx";
+			st,trigger-polarity = <1>;
 		};
 		...
 		other adc child nodes follow...
-- 
1.9.1