From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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: a060b8c511ab ("gpiolib: implement low-level, shared GPIO support")
Reported-by: Cosmin Tanislav <demonsingur@gmail.com>
Closes: https://lore.kernel.org/all/2d96e464-e17c-4ff5-9a08-b215b77da04f@gmail.com/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
drivers/gpio/gpiolib-shared.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpio/gpiolib-shared.c b/drivers/gpio/gpiolib-shared.c
index 62f32489a8a6f70c567ed93645f1e36a81612def..7e049f2153a3fcc51803dd185fe5db60daea789f 100644
--- a/drivers/gpio/gpiolib-shared.c
+++ b/drivers/gpio/gpiolib-shared.c
@@ -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;
}
--
2.51.0