Commit 114e594e authored by Bartosz Golaszewski's avatar Bartosz Golaszewski
Browse files

gpio: shared: ignore GPIO hogs when traversing the device tree 



GPIO hogs have a "gpios" property but it's not a phandle to a remote
node - it references the parent GPIO controller. We must not try to
parse it as a phandle.

Fixes: a060b8c5 ("gpiolib: implement low-level, shared GPIO support")
Reported-by: default avatarCosmin Tanislav <demonsingur@gmail.com>
Closes: https://lore.kernel.org/all/2d96e464-e17c-4ff5-9a08-b215b77da04f@gmail.com/
Link: https://lore.kernel.org/r/20251126-gpio-shared-fixes-v1-2-18309c0e87b5@linaro.org


Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
parent cfab6dc0

drivers/gpio/gpiolib-shared.c

+7 −0
Original line number Diff line number Diff line
@@ -83,6 +83,13 @@ static bool gpio_shared_of_node_ignore(struct device_node *node) 
	if (of_node_name_eq(node, "__symbols__"))

		return true;



	/*

	 * GPIO hogs have a "gpios" property which is not a phandle and can't

	 * possibly refer to a shared GPIO.

	 */

	if (of_property_present(node, "gpio-hog"))

		return true;



	return false;

}