From: Fabrice Gasnier Date: Mon, 24 Jul 2017 16:10:39 +0000 (+0200) Subject: dt-bindings: iio: adc: stm32: add optional st,min-sample-time-nsecs X-Git-Tag: Ubuntu-5.4-5.4.0-11.14~7069^2~228^2~41 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=bc8e1f5b21b1b816173937747b0e9c6db76c19b2;p=mirror_ubuntu-focal-kernel.git 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 Acked-by: Rob Herring Signed-off-by: Jonathan Cameron --- 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 {