Re: [libgpiod][PATCH 0/3] bindings: python: more flexible reconfigure_lines()

[Bartosz Golaszewski <brgl@xxxxxxxx>]

On Wed, Jun 26, 2024 at 7:38 AM Kent Gibson <warthog618@xxxxxxxxx> wrote:
>
> This series addresses issue #54[1], making reconfigure_lines() less
> restrictive in the configurations it will accept, allowing for
> misordered configurations and reconfiguring a subset of lines.
>
> Patch 1 adds a set of tests for the new behaviour.  These all fail with
> the existing bindings, but pass after patch 2 is applied.
>
> Patch 2 is the change to reconfigure_lines() itself.
>
> The reconfiguration of a subset of lines works better with a change to the
> kernel to ignore reconfiguration of lines without a direction set,
> i.e. a default LineSettings.
> With existing kernels, if a line has been requested with flags set to
> non-default values those flags will be reset to default values, though
> that may not become evident electrically until subsequent operations are
> performed on the line.
>
> Patch 3 extends the tests to demonstrate that kernel issue.  A kernel
> patch addressing that issue has been submitted[2], and the test passes
> with that patch applied.
>
> Cheers,
> Kent.
>
> [1] https://github.com/brgl/libgpiod/issues/54
> [2] https://lore.kernel.org/linux-gpio/20240626052925.174272-3-warthog618@xxxxxxxxx
>
> Kent Gibson (3):
>   bindings: python: tests: extend reconfiguration tests
>   bindings: python: more flexible reconfigure_lines()
>   bindings: python: tests: add coverage of kernel reconfigure as-is
>     behaviour
>
>  bindings/python/gpiod/line_request.py       | 17 +++---
>  bindings/python/tests/tests_line_request.py | 64 ++++++++++++++++++++-
>  2 files changed, 72 insertions(+), 9 deletions(-)
>
> --
> 2.39.2
>

FYI I did not forget about this series - I'm just waiting for the next
stable kernel release so that changes required for the new test cases
to pass become available.

Bart