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Commit 098c5a6a authored by Fabrice Gasnier's avatar Fabrice Gasnier Committed by Jonathan Cameron
Browse files

dt-bindings: iio: adc: stm32: add support for diff channels 



STM32H7 ADC channels may be configured either as single-ended or
differential.
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: default avatarFabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent ca6a2d86

Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt

+24 −0
Original line number Diff line number Diff line
@@ -62,6 +62,15 @@ 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.

  Both properties can be used together. Some channels can be used as

  single-ended and some other ones as differential (mixed). But channels

  can't be configured both as single-ended and differential (invalid).

- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in

  Documentation/devicetree/bindings/iio/iio-bindings.txt
@@ -111,3 +120,18 @@ Example: 
		...

		other adc child nodes follow...

	};



Example to setup:

- channel 1 as single-ended

- channels 2 & 3 as differential (with resp. 6 & 7 negative inputs)



	adc: adc@40022000 {

		compatible = "st,stm32h7-adc-core";

		...

		adc1: adc@0 {

			compatible = "st,stm32h7-adc";

			...

			st,adc-channels = <1>;

			st,adc-diff-channels = <2 6>, <3 7>;

		};

	};