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* tools: gpio: implement gpio-watchBartosz Golaszewski2020-02-121-0/+99
Add a simple program that allows to test the new LINECHANGED_FD ioctl(). Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>