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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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3
Documentation/userspace-api/gpio/error-codes.rst
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@@ -65,7 +65,8 @@ GPIO Error Codes
- - ``ENXIO``
- No device corresponding to this device special file exists.
- Typically returned when a feature requiring interrupt support was
requested, but the line does not support interrupts.
.. note::