gpio: mockup: implement event injecting over debugfs
Create a debugfs directory for every mockup chip and a single file for every line. Writing (0 or 1) to these files allows the user to inject line events (falling or rising edge respectively). Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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