[PATCH v2 4/8] PCI/MSI: of: Allow msi_domain lookup using the PHB node
From: Marc Zyngier <hidden>
Date: 2015-01-08 17:06:28
Also in:
linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
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 <redacted> --- 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