On Wed, 25 Oct 2017 11:27:43 +0200
Fabrice Gasnier <fabrice.gasnier@xxxxxx> wrote:
> 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: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
Works for me, but I will want Rob to have time to look at this.
Unfortunately we are very late in the cycle, so I think this one
will have to wait for next cycle now.
Sorry about that, sometimes timing is against us and I want to
get my final pull request for this cycle out today.
Jonathan
> ---
> Changes in v2:
> - Add differential channels example
> - Add a note on mixed single-ended / differential channels
> ---
> .../devicetree/bindings/iio/adc/st,stm32-adc.txt | 24 ++++++++++++++++++++++
> 1 file changed, 24 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..e8bb824 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> @@ -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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