On Fri, Aug 18, 2017 at 10:34:19AM -0400, Cliff Brake wrote: > After a suggestion of using a NMI and a bit of research, it seems > something like the following article is the probably a reasonable > approach: > > http://free-electrons.com/blog/fiq-handlers-in-the-arm-linux-kernel/ The use of a FIQ probably gives you the best chance to achieve the latencies you want; but keep in mind that the use of FIQ means you'll need to get your hands pretty dirty. The set of operations legal to perform from NMI context is very, very small. The usage of gpiolib (and therefore any existing i.MX gpio driver) is probably not going to work from NMI context, so you'll have to roll your own solution. Julia
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