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| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2017-07-24 18:10:39 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2017-08-09 14:11:57 +0100 |
| commit | bc8e1f5b21b1b816173937747b0e9c6db76c19b2 (patch) | |
| tree | 73617759f9cc83f3de2edce0586bc6f1d00b1ffe /Documentation | |
| parent | 0d0d4d21a09981e65b2bd386c999e8c0ecc6444e (diff) | |
| download | linux-bc8e1f5b21b1b816173937747b0e9c6db76c19b2.tar.gz linux-bc8e1f5b21b1b816173937747b0e9c6db76c19b2.tar.bz2 linux-bc8e1f5b21b1b816173937747b0e9c6db76c19b2.zip | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt index 8310073f14e1..48bfcaa3ffcd 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 { |