Revert "gpio: Access gpio_bus_type in gpiochip_setup_dev()"

This reverts commit cc11f4e.

Commit cc11f4e ("gpio: Access `gpio_bus_type` in
gpiochip_setup_dev()") moved the bus type assignment from
gpiochip_add_data_with_key() to gpiochip_setup_dev().

This change introduced a bug where dev_printk() and friends might access
the bus name after gpiochip_add_data_with_key() but before
gpiochip_setup_dev() has run.  In this window, the bus type is not yet
initialized, leading to empty bus names in logs.

Move the bus type assignment back to gpiochip_add_data_with_key() to
ensure the bus name is available before any potential users like
dev_printk().

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/all/CAMuHMdU0Xb=Moca5LUex+VxyHQa2-uYJgYf4hzHiSEjDCQQT=Q@mail.gmail.com/
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20260313054112.1248074-1-tzungbi@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

Author: Tzung-Bi Shih

drivers/gpio/gpiolib.c

@@ -908,8 +908,6 @@ static int gpiochip_setup_dev(struct gpio_chip *gc)
 	struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev);
 	int ret;
 
-	gdev->dev.bus = &gpio_bus_type;
-
 	/*
 	 * If fwnode doesn't belong to another device, it's safe to clear its
 	 * initialized flag.
@@ -1160,6 +1158,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	 * then make sure they get free():ed there.
 	 */
 	gdev->dev.type = &gpio_dev_type;
+	gdev->dev.bus = &gpio_bus_type;
 	gdev->dev.parent = gc->parent;
 	device_set_node(&gdev->dev, gpiochip_choose_fwnode(gc));
 
@@ -1299,8 +1298,8 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	 * we get a device node entry in sysfs under
 	 * /sys/bus/gpio/devices/gpiochipN/dev that can be used for
 	 * coldplug of device nodes and other udev business.
-	 * We can do this only if gpiolib has been initialized
-	 * (i.e., `gpio_bus_type` is ready).  Otherwise, defer until later.
+	 * We can do this only if gpiolib has been initialized.
+	 * Otherwise, defer until later.
 	 */
 	if (gpiolib_initialized) {
 		ret = gpiochip_setup_dev(gc);