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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2019-02-15 09:17:36 +0100
committerLinus Walleij <linus.walleij@linaro.org>2019-02-20 10:53:52 +0100
commit9aac1e336c3ab3824f646224f4b2309b63c51668 (patch)
treedc95e52cb2329c95d96a8eaefdbb34751076234d /Documentation/driver-api
parent2a9a2f27d35af6c44c2e38437c855f55390c3439 (diff)
downloadlinux-9aac1e336c3ab3824f646224f4b2309b63c51668.tar.bz2
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: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/driver-api')
-rw-r--r--Documentation/driver-api/gpio/legacy.rst9
1 files changed, 4 insertions, 5 deletions
diff --git a/Documentation/driver-api/gpio/legacy.rst b/Documentation/driver-api/gpio/legacy.rst
index 5e9421e05f1d..9bc34ba697d9 100644
--- a/Documentation/driver-api/gpio/legacy.rst
+++ b/Documentation/driver-api/gpio/legacy.rst
@@ -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)