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gpio: iopoll: implement gpio_poll_timeout_us
Sometimes we need to wait for state change on a GPIO, provide a helper
for future code to do this.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
WIP_next-LS master next v2020.07.0 v2020.06.0 v2020.05.0 v2020.04.0 v2020.03.0 v2020.02.0 v2020.01.0 v2019.12.0 v2019.11.0 v2019.10.0
1 parent b330984 commit fb2e987ee1f54bc9fac26be03e93f839faa9e023
@Ahmad Fatoum Ahmad Fatoum authored on 9 Sep 2019
Sascha Hauer committed on 9 Sep 2019
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include/gpio.h