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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>