Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9aac1e33 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Linus Walleij
Browse files

Documentation: gpio: legacy: Don't use POLLERR for poll(2) 



According to the manpage of poll(2) and also looking at the respective
syscall providing POLLERR in .events is a no-op. So don't recommend
using it.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 2a9a2f27

Documentation/driver-api/gpio/legacy.rst

+4 −5
Original line number Diff line number Diff line
@@ -690,11 +690,10 @@ and have the following read/write attributes: 
		and if it has been configured to generate interrupts (see the

		description of "edge"), you can poll(2) on that file and

		poll(2) will return whenever the interrupt was triggered. If

		you use poll(2), set the events POLLPRI and POLLERR. If you

		use select(2), set the file descriptor in exceptfds. After

		poll(2) returns, either lseek(2) to the beginning of the sysfs

		file and read the new value or close the file and re-open it

		to read the value.

		you use poll(2), set the events POLLPRI. If you use select(2),

		set the file descriptor in exceptfds. After poll(2) returns,

		either lseek(2) to the beginning of the sysfs file and read the

		new value or close the file and re-open it to read the value.



	"edge" ... reads as either "none", "rising", "falling", or

		"both". Write these strings to select the signal edge(s)