On Thu, Nov 05, 2020 at 07:46:14PM +0100, Ahmad Fatoum wrote: > Hello Benjamin, > Hello Fabrice, > > In the stm32-timer-cnt driver I find unused #defines for TIM_CCMR_MASK and > TIM_CCER_MASK, which to me hint that support for the "input capture mode"[1] > was implemented but removed prior to upstreaming. > > It doesn't look like the counter device API is yet made to support such > an input capture mode (latching a counter value on an external event, e.g. > to timestamp incoming rising edges to measure jitter between pulses). > > I am still very new to this, so I figured I ask whether you already have > thoughts (or maybe code to share) on how to best integrate this with the > counter device API. > > I've added linux-iio/linux-stm32 to the CC as well, so if someone else > has an idea how to best do this, please share. > > [1]: 40.3.7 in RM0436 rev 3 > > Cheers, > Ahmad > > -- > Pengutronix e.K. | | > Steuerwalder Str. 21 | http://www.pengutronix.de/ | > 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | Hi Ahmad, Regarding the Counter subsystem, I'm developing a Counter character device API that supports timestamps for counter devices: https://lore.kernel.org/linux-arm-kernel/157d1edf-feec-33b5-7ad5-94f99316ca6e@xxxxxxxxxxxxxx/T/ My aim is to get this functionality picked up for the Linux 5.11 merge window. I have one more revision at least that should be ready in a couple weeks -- I'll CC you for that patchset to keep you in the loop; I force-push periodically to my personal repo when as I develop, so you can take a look at the current state of this next revision if you're curious: https://gitlab.com/vilhelmgray/iio/-/tree/counter_chrdev_v6 Sincerely, William Breathitt Gray
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