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gpio: swnode: defer probe on references to unregistered software nodes

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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 <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260407-swnode-unreg-retcode-v4-2-1b2f0725eb9c@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
This commit is contained in:
Bartosz Golaszewski
2026-04-07 15:27:58 +02:00
parent 5bcd451286
commit ca13ab6540
1 changed files with 8 additions and 0 deletions
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8
drivers/gpio/gpiolib-swnode.c
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@@ -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",