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Subject[PATCH v2 4/8] PCI/MSI: of: Allow msi_domain lookup using the PHB node
Date
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 PHB node if it doesn't have a valid msi-parent property.

Signed-off-by: Marc Zyngier <marc.zyngier@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 d8d1274..75bfb85 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -68,9 +68,14 @@ 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;
dev_set_msi_domain(&bus->dev, irq_find_host(np));
#endif
}
--
2.1.4


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