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Subject[PATCH 1/3] dt-bindings: iio: adc: stm32: add support for diff channels
STM32H7 ADC channels may be configured either as single-ended or
Add 'st,adc-diff-channels' property to support differential channels.
Differential channels are defined as a pair of positive and negative
inputs: vinp & vinn.

Signed-off-by: Fabrice Gasnier <>
Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
index 48bfcaa3..c3c8de1 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
@@ -62,6 +62,12 @@ Required properties:
- st,adc-channels: List of single-ended channels muxed for this ADC.
It can have up to 16 channels on stm32f4 or 20 channels on stm32h7, numbered
from 0 to 15 or 19 (resp. for in0..in15 or in0..in19).
+- st,adc-diff-channels: List of differential channels muxed for this ADC.
+ Depending on part used, some channels can be configured as differential
+ instead of single-ended (e.g. stm32h7). List here positive and negative
+ inputs pairs as <vinp vinn>, <vinp vinn>,... vinp and vinn are numbered
+ from 0 to 19 on stm32h7)
+ Note: At least one of "st,adc-channels" or "st,adc-diff-channels" is required.
- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in

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