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Documentation: gpio: Reconfiguration with unset direction (uAPI v1)

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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>
This commit is contained in:
Kent Gibson 2024-06-26 13:29:24 +08:00 committed by Bartosz Golaszewski
parent 3550b5db3a
commit e48fe75afa
1 changed files with 4 additions and 1 deletions
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5
Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst
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@ -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