PCI: designware: Parse bus-range property from devicetree
This allows to explicitly specify the covered bus numbers in the
devicetree, which will come in handy once we see a SoC with more than one
PCIe host controller instance.
Previously the driver relied on the behavior of pci_scan_root_bus() to fill
in a range of 0x00-0xff if no valid range was found. We fall back to the
same range if no valid DT entry was found to keep backwards compatibility,
but now do it explicitly.
[bhelgaas: use %pR in error message to avoid duplication]
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
Acked-by: Mohit Kumar <mohit.kumar@st.com>
diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
index ed0d9b9..9f4faa8 100644
--- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
@@ -23,3 +23,6 @@
Optional properties:
- reset-gpio: gpio pin number of power good signal
+- bus-range: PCI bus numbers covered (it is recommended for new devicetrees to
+ specify this property, to keep backwards compatibility a range of 0x00-0xff
+ is assumed if not present)
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 76d3d8e..561fa30 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -500,6 +500,16 @@
}
}
+ ret = of_pci_parse_bus_range(np, &pp->busn);
+ if (ret < 0) {
+ pp->busn.name = np->name;
+ pp->busn.start = 0;
+ pp->busn.end = 0xff;
+ pp->busn.flags = IORESOURCE_BUS;
+ dev_dbg(pp->dev, "failed to parse bus-range property: %d, using default %pR\n",
+ ret, &pp->busn);
+ }
+
if (!pp->dbi_base) {
pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
resource_size(&pp->cfg));
@@ -794,6 +804,7 @@
sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
+ pci_add_resource(&sys->resources, &pp->busn);
return 1;
}
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 3e84e0ae..a476e60 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -48,6 +48,7 @@
struct resource cfg;
struct resource io;
struct resource mem;
+ struct resource busn;
struct pcie_port_info config;
int irq;
u32 lanes;