gpio: Timestamp events in hardirq handler
Add a hardirq handler to the GPIO userspace event loop, making sure to pick up the timestamp there, as close as possible in time relative to the actual event causing the interrupt. Tested with a simple pushbutton GPIO on ux500 and seems to work fine. Cc: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: NFelipe Balbi <felipe.balbi@linux.intel.com> Reported-by: NFelipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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