device property: Check fwnode->secondary when finding properties

[ Upstream commit c097af1 ]

fwnode_property_get_reference_args() searches for named properties
against a fwnode_handle, but these could instead be against the fwnode's
secondary. If the property isn't found against the primary, check the
secondary to see if it's there instead.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
Link: https://lore.kernel.org/r/20211128232455.39332-1-djrscally@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/base/property.c

@@ -479,8 +479,17 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
 				       unsigned int nargs, unsigned int index,
 				       struct fwnode_reference_args *args)
 {
-	return fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
-				  nargs, index, args);
+	int ret;
+
+	ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
+				 nargs, index, args);
+
+	if (ret < 0 && !IS_ERR_OR_NULL(fwnode) &&
+	    !IS_ERR_OR_NULL(fwnode->secondary))
+		ret = fwnode_call_int_op(fwnode->secondary, get_reference_args,
+					 prop, nargs_prop, nargs, index, args);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);