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Groups > linux.kernel > #1592093
| From | Lars-Peter Clausen <lars@metafoo.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger |
| Date | 2017-03-03 17:00 +0100 |
| Message-ID | <tgXMC-3jh-23@gated-at.bofh.it> (permalink) |
| References | <tfTBn-7wT-7@gated-at.bofh.it> <tfTBn-7wT-5@gated-at.bofh.it> <tgUOK-1js-19@gated-at.bofh.it> <tgWxc-2tg-27@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 03/03/2017 02:00 PM, Fabrice Gasnier wrote: > On 03/03/2017 12:45 PM, Lars-Peter Clausen wrote: >> On 02/28/2017 05:51 PM, Fabrice Gasnier wrote: >>> 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 the IRQ for the GPIO as a generic software IRQ establish the hardware connection between the GPIO block and the ADC?
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Re: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger Lars-Peter Clausen <lars@metafoo.de> - 2017-03-03 13:50 +0100
Re: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger Fabrice Gasnier <fabrice.gasnier@st.com> - 2017-03-03 15:40 +0100
Re: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger Lars-Peter Clausen <lars@metafoo.de> - 2017-03-03 17:00 +0100
Re: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger Lars-Peter Clausen <lars@metafoo.de> - 2017-03-03 17:00 +0100
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