A number of platforms do not need to use the msi-parent property,
as the host bridge itself provides the MSI controller.
Allow this configuration by performing an irq domain lookup based
on the host bridge node if it doesn't have a valid msi-parent property.
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
drivers/pci/of.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 09df465..9d61cef 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -69,9 +69,14 @@ void pci_set_phb_of_msi_domain(struct pci_bus *bus)
if (!bus->dev.of_node)
return;
+ /* Start looking for a phandle to an MSI controller. */
np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
+ /*
+ * If we don't have an msi-parent property, look for a domain
+ * directly attached to the host bridge.
+ */
if (!np)
- return;
+ np = bus->dev.of_node;
d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
if (!d)
d = irq_find_host(np);
--
2.1.4
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