diff options
| author | Kent Gibson <warthog618@gmail.com> | 2024-01-23 21:38:28 +0800 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-01-25 09:42:25 +0100 |
| commit | 42969726a19f796f0e731ec74347fd8a0e4e91a2 (patch) | |
| tree | 1765cae3feb5d2b52c780389d26ed39f027e60ee /Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst | |
| parent | 3473765920eaa4e7d71a0e4869937d2117bb0398 (diff) | |
Documentation: gpio: describe uAPI behaviour for unsupported config
The existing uAPI documentation does not adequately describe how the kernel
handles the case where the underlying hardware or driver does not support
the requested configuration.
Add a Configuration Support section describing that behaviour to both the
v1 and v2 documentation, and better document the errors returned where the
requested configuration cannot be supported.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst')
| -rw-r--r-- | Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst b/Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst index 7d0b932925c6..09a9254f38cf 100644 --- a/Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst +++ b/Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst @@ -48,6 +48,12 @@ to its default state. Requesting a line already in use is an error (**EBUSY**). +Requesting edge detection on a line that does not support interrupts is an +error (**ENXIO**). + +As with the :ref:`line handle<gpio-get-linehandle-config-support>`, the +bias configuration is best effort. + Closing the ``chip_fd`` has no effect on existing line events. Configuration Rules |