rust: pwm: Add UnregisteredChip wrapper around Chip

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The `pwm::Registration::register` function provides no guarantee that the
function isn't called twice with the same pwm chip, which is considered
unsafe.

Add `pwm::UnregisteredChip` as wrapper around `pwm::Chip`.
Implement `pwm::UnregisteredChip::register` for the registration. This
function takes ownership of `pwm::UnregisteredChip` and therefore
guarantees that the registration can't be called twice on the same pwm
chip.

Signed-off-by: Markus Probst <markus.probst@posteo.de>
Tested-by: Michal Wilczynski <m.wilczynski@samsung.com>
Acked-by: Michal Wilczynski <m.wilczynski@samsung.com>
Link: https://patch.msgid.link/20251202-pwm_safe_register-v2-1-7a2e0d1e287f@posteo.de
[ukleinek: fixes a typo that Michal pointed out during review]
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

...

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Markus Probst 2025-12-02 18:17:52 +00:00 • committed by Uwe Kleine-König

parent 5025569cb6

commit 85a5ffbd56

2 changed files with 45 additions and 25 deletions

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2

drivers/pwm/pwm_th1520.rs

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68

rust/kernel/pwm.rs

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