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PCI/MSI: Allow msi_domain lookup using the host bridge node 

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.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-7-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Marc Zyngier 2015-07-28 14:46:13 +01:00 committed by Thomas Gleixner
parent b165e2b60b
commit 471c931cb2
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/of.c
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@ -72,8 +72,13 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
/* 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)