From: Bartosz Golaszewski Date: Tue, 7 Apr 2026 13:27:58 +0000 (+0200) Subject: gpio: swnode: defer probe on references to unregistered software nodes X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ca13ab654064fee86d6e7c9e87d0af7789561509;p=thirdparty%2Fkernel%2Flinux.git gpio: swnode: defer probe on references to unregistered software nodes fwnode_property_get_reference_args() now returns -ENOTCONN when called on a software node referencing another software node which has not yet been registered as a firmware node. It makes sense to defer probe in this situation as the node will most likely be registered later on and we'll be able to resolve the reference eventually. Change the behavior of swnode_find_gpio() to return -EPROBE_DEFER if the software node reference resolution returns -ENOTCONN. Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260407-swnode-unreg-retcode-v4-2-1b2f0725eb9c@oss.qualcomm.com Signed-off-by: Bartosz Golaszewski --- diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c index 0d7f3f09a0b4b..4374067f621ed 100644 --- a/drivers/gpio/gpiolib-swnode.c +++ b/drivers/gpio/gpiolib-swnode.c @@ -93,6 +93,14 @@ struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, ret = swnode_gpio_get_reference(fwnode, propname, idx, &args); if (ret == 0) break; + if (ret == -ENOTCONN) + /* + * -ENOTCONN for a software node reference lookup means + * that a remote struct software_node exists but has + * not yet been registered as a firmware node. Defer + * until this happens. + */ + return ERR_PTR(-EPROBE_DEFER); } if (ret) { pr_debug("%s: can't parse '%s' property of node '%pfwP[%d]'\n",