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Documentation: gpio: describe uAPI behaviour for unsupported config

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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>
This commit is contained in:
Kent Gibson
2024-01-23 21:38:28 +08:00
committed by Bartosz Golaszewski
parent 3473765920
commit 42969726a1
6 changed files with 106 additions and 7 deletions
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5
Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst
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@@ -41,12 +41,13 @@ line or introducing potential glitches.
The configuration applies to all requested lines.
The same :ref:`gpio-get-linehandle-config-rules` that apply when requesting the
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.
The motivating use case for this command is changing direction of
bi-directional lines between input and output, but it may be used more
generally move lines seamlessly from one configuration state to another.
generally to move lines seamlessly from one configuration state to another.
To only change the value of output lines, use
gpio-handle-set-line-values-ioctl.rst.