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| author | Kent Gibson <warthog618@gmail.com> | 2024-06-26 07:29:24 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-07-01 09:38:45 +0200 |
| commit | e48fe75afa539d110753f7420aa398ef89f8e383 (patch) | |
| tree | 057c1911664ce34c7ff6e6eec054163c019a92a5 /Documentation/userspace-api | |
| parent | dt-bindings: gpio: fsl,qoriq-gpio: add common property gpio-line-names (diff) | |
| download | linux-e48fe75afa539d110753f7420aa398ef89f8e383.tar.xz linux-e48fe75afa539d110753f7420aa398ef89f8e383.zip | |
Documentation: gpio: Reconfiguration with unset direction (uAPI v1)
Update description of reconfiguration rules, adding requirement that a
direction flag be set or the configuration is considered invalid.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240626052925.174272-4-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst b/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst index d002a84681ac..a03f30db63ab 100644 --- a/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst +++ b/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst @@ -43,7 +43,10 @@ The configuration applies to all requested lines. The same :ref:`gpio-get-linehandle-config-rules` and :ref:`gpio-get-linehandle-config-support` that apply when requesting the -lines also apply when updating the line configuration. +lines also apply when updating the line configuration, with the additional +restriction that a direction flag must be set. Requesting an invalid +configuration, including without a direction flag set, is an error +(**EINVAL**). The motivating use case for this command is changing direction of bi-directional lines between input and output, but it may be used more |