bindings: python: more flexible reconfigure_lines()

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/[email protected]

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(-)

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2.39.2