From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
This patch introduces a new DT binding, msi-parent, which can
be used to specify MSI-parent phandle for a particular PCI
generic host controller.
Also, it implements and registers set_msi_parent callback.
Cc: Bjorn Helgass <bhelgaas@xxxxxxxxxx>
Cc: Liviu Dudau <liviu.dudau@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
---
Documentation/devicetree/bindings/pci/host-generic-pci.txt | 3 +++
drivers/pci/host/pci-host-generic.c | 13 +++++++++++++
2 files changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
index cf3e205..6996af7 100644
--- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt
+++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
@@ -36,6 +36,8 @@ Properties of the host controller node:
- reg : The Configuration Space base address and size, as accessed
from the parent bus.
+- msi-parent : Specify the phandle of the corresponded MSI controller
+ for this PCI host controller.
Properties of the /chosen node:
@@ -77,6 +79,7 @@ pci {
device_type = "pci";
#address-cells = <3>;
#size-cells = <2>;
+ msi-parent = <&msictrl0>;
bus-range = <0x0 0x1>;
// CPU_PHYSICAL(2) SIZE(2)
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 1895907..c4fbcda 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -42,6 +42,7 @@ struct gen_pci {
struct pci_host_bridge host;
struct gen_pci_cfg_windows cfg;
struct list_head resources;
+ struct msi_chip *mchip;
};
static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
@@ -122,9 +123,19 @@ static int gen_pci_config_write(struct pci_bus *bus, unsigned int devfn,
return PCIBIOS_SUCCESSFUL;
}
+static int gen_pci_set_msi_parent(struct pci_bus *bus)
+{
+ struct gen_pci *pci = bus_to_gen_pci(bus);
+
+ bus->msi = pci->mchip;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
static struct pci_ops gen_pci_ops = {
.read = gen_pci_config_read,
.write = gen_pci_config_write,
+ .set_msi_parent = gen_pci_set_msi_parent,
};
static const struct of_device_id gen_pci_of_match[] = {
@@ -303,6 +314,8 @@ static int gen_pci_probe(struct platform_device *pdev)
return err;
}
+ pci->mchip = of_pci_find_msi_chip_by_node(of_parse_phandle(np,
+ "msi-parent", 0));
pci_common_init_dev(dev, &hw);
return 0;
}
--
1.9.3
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