On Thu, Jul 23, 2015 at 10:26:25AM +0100, Marc Zyngier wrote: > 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.zyngier@xxxxxxx> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > --- > drivers/pci/of.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/of.c b/drivers/pci/of.c > index e2ebb7d..fcfdadf 100644 > --- a/drivers/pci/of.c > +++ b/drivers/pci/of.c > @@ -69,12 +69,21 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) > > if (!bus->dev.of_node) > return NULL; > + > + /* 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 NULL; > + np = bus->dev.of_node; > + > d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI); > if (!d) > d = irq_find_host(np); > + > return d; > #else > return NULL; > -- > 2.1.4 > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
