gpio: provide gpiod_is_shared()

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Provide an interface allowing consumers to check if a GPIO descriptor
represents a GPIO that can potentially be shared by multiple consumers
at the same time. This is exposed to allow subsystems that already
work around the limitations of the current non-exclusive GPIO handling
in some ways, to gradually convert to relying on the new shared GPIO
feature of GPIOLIB.

Extend the gpiolib-shared module to mark the GPIO shared proxy
descriptors with a flag checked by the new interface.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20251112-gpio-shared-v4-6-b51f97b1abd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

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This commit is contained in:

Bartosz Golaszewski 2025-11-12 14:55:35 +01:00

parent 1e4f6db614

commit eb374f764a

4 changed files with 48 additions and 0 deletions

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18

drivers/gpio/gpiolib-shared.c

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20

drivers/gpio/gpiolib.c

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1

drivers/gpio/gpiolib.h

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9

include/linux/gpio/consumer.h

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