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

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
......@@ -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>;
};
};
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