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List:       linux-iio
Subject:    Re: [PATCH v2 2/3] dt-bindings: iio: adc: stm32: add optional st,min-sample-time-nsecs
From:       Jonathan Cameron <jic23 () kernel ! org>
Date:       2017-07-30 16:24:17
Message-ID: 20170730172417.5c3d38bb () kernel ! org
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On Mon, 24 Jul 2017 18:10:39 +0200
Fabrice Gasnier <fabrice.gasnier@st.com> wrote:

> 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>
This ideally wants a devicetree review so I'm going to sit on
it for a few days longer.

Looks fine to me as does the implementation patch.

Give me a kick in a week or so if we have seen no progress on
this.  I will be travelling from next weekend and access may
be a little intermittent for up to two weeks.

Thanks,

Jonathan
> ---
> Changes in v2:
> - Use 'st,min-sample-time-nsecs' instead of 'min-sample-time'.
> ---
> Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 5 +++++
> 1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt \
> b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt index \
>                 8310073..48bfcaa3 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> @@ -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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