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Date: Fri, 17 Feb 2017 18:23:41 +0200 From: Daniel Baluta <daniel.baluta@...il.com> To: Fabrice Gasnier <fabrice.gasnier@...com> Cc: Jonathan Cameron <jic23@...nel.org>, linux@...linux.org.uk, Rob Herring <robh+dt@...nel.org>, linux-arm-kernel@...ts.infradead.org, Devicetree List <devicetree@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>, Mark Rutland <mark.rutland@....com>, mcoquelin.stm32@...il.com, alexandre.torgue@...com, Lars-Peter Clausen <lars@...afoo.de>, Hartmut Knaack <knaack.h@....de>, Peter Meerwald <pmeerw@...erw.net>, benjamin.gaignard@...aro.org, benjamin.gaignard@...com, Linus Walleij <linus.walleij@...aro.org> Subject: Re: [RFC 0/4] iio: trigger: Add OF support and GPIO based trigger On Fri, Feb 17, 2017 at 6:03 PM, Fabrice Gasnier <fabrice.gasnier@...com> wrote: > Hi, > > I send this as an RFC, as I'm digging to try to get as generic > as possible GPIO based trigger support, as discussed earlier in > other patchset "Add EXTI GPIO trigger support to STM32 ADC": > https://www.spinics.net/lists/arm-kernel/msg559091.html > > Following various comments on this, I sent this RFC to address two > topics, that I see as possible prerequisite: > - Add trigger OF support > - GPIO based trigger I wonder if we could use configfs to create and configure a GPIO based trigger. You should just create another trigger type (look into drivers/iio/trigger/iio-trig-hrtimer.c) the userspace API will look like this: # cd /config/iio/triggers # insert your iio-trig-gpio # setup the global parameters for the GPIO (the local params can be set via dts/acpi) # cd /config/iio/trigers/gpios/ #mkdir t1 And this will create an io-gpio-trigger named t1. Not sure this fits your usecase but would be nice to consider. thanks, Daniel.
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