[PATCH v2 12/26] PCI: of: Set fwnode device of newly created PCI device nodes

Herve Codina
2025-05-07T07:13:50Z

Device-tree node can be created when CONFIG_PCI_DYNAMIC_OF_NODES. Those
node are created and filled based on PCI core information but the
fwnode device field is not set.

When later an overlay is applied, this consuses fw_devlink. Indeed,
without any device attached to the node, fw_devlink considers that this
node will never become a device. When this node is pointed as a
supplier, devlink looks at its ancestors in order to find a node with a
device that could be used as the supplier.

In the PCI use case, this leads to links that wrongly use the PCI root
bridge device as the supplier instead of the expected PCI device.

Setting the fwnode device to the device of the PCI device allows devlink
to use this device as a supplier and so, correct links are created.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
drivers/pci/of.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 2435200fdd58..ab19bfaaeab2 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -709,6 +709,13 @@ void of_pci_make_dev_node(struct pci_dev *pdev)
if (ret)
goto out_free_node;

+ /*
+ * Set the fwnode device in order to have fw_devlink creating links
+ * pointing to this PCI device instead of walking up to the PCI host
+ * bridge.
+ */
+ fw_devlink_set_device(&np->fwnode, &pdev->dev);
+
ret = of_changeset_apply(cset);
if (ret)
goto out_free_node;
--
2.49.0