On 03/03/2017 04:46 PM, Lars-Peter Clausen wrote:

On 03/03/2017 02:00 PM, Fabrice Gasnier wrote:

quoted

On 03/03/2017 12:45 PM, Lars-Peter Clausen wrote:

quoted

On 02/28/2017 05:51 PM, Fabrice Gasnier wrote:

quoted

EXTi (external interrupt) signal can be routed internally as trigger
source for ADC conversions: STM32F4 ADC can use EXTI11.

Retrieve interrupt trigger from DT, so it can be muxed into ADC IP,
via extsel.

Hi,

Sorry, I have some trouble understanding the specifics of this. Is EXTI a
hardware input signal into the ADC that automatically triggers a conversion
when asserted? If yes how is it configured which external signal is used
here. Your bindings suggest that any GPIO can be used, but the driver only
differentiates between EXTI on or EXTI off.

Hi Lars,

Yes, STM32 EXTI is external interrupt/event line. In case of STM32 ADC,
EXTI11 signal can be used to start a conversion. In this case, it must
be selected inside ADC IP using extsel bitfield. This EXTI11 line can
mapped from any GPIO bank A,B... line 11 (e.g. PA11 or PB11...) by using
interrupt binding.
This is why I expose this in DT.

How is the mapping? That's the part I don't understand. How does requesting

How is the mapping done?

the IRQ for the GPIO as a generic software IRQ establish the hardware
connection between the GPIO block and the ADC?