Commit bc8e1f5b authored Jul 24, 2017 by Fabrice Gasnier Committed by Jonathan Cameron Aug 09, 2017

dt-bindings: iio: adc: stm32: add optional st,min-sample-time-nsecs



STM32 ADC allows each channel to be sampled with a different sampling
time. There's an application note that deals with this: 'How to get
the best ADC accuracy in STM32...' It basically depends on analog input
signal electrical properties (depends on board).

Add optional 'st,min-sample-time-nsecs' property so this can be tuned
in dt.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

parent 0d0d4d21

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

+5 −0

Original line number	Diff line number	Diff line
		@@ -74,6 +74,11 @@ Optional properties:
		* can be 6, 8, 10 or 12 on stm32f4
		* can be 8, 10, 12, 14 or 16 on stm32h7
		Default is maximum resolution if unset.
		- st,min-sample-time-nsecs: Minimum sampling time in nanoseconds.
		Depending on hardware (board) e.g. high/low analog input source impedance,
		fine tune of ADC sampling time may be recommended.
		This can be either one value or an array that matches 'st,adc-channels' list,
		to set sample time resp. for all channels, or independently for each channel.

		Example:
		adc: adc@40012000 {

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