[U-Boot] [PATCH V3 1/2] pci: Support parsing PCI controller DT subnodes

[Marek Vasut]

The PCI controller can have DT subnodes describing extra properties
of particular PCI devices, ie. a PHY attached to an EHCI controller
on a PCI bus. This patch parses those DT subnodes and assigns a node
to the PCI device instance, so that the driver can extract details
from that node and ie. configure the PHY using the PHY subsystem.

Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Tom Rini <trini at konsulko.com>
---
V3: Reword the comment
V2: Move the whole machinery to pci_bind_bus_devices(), right after
    the driver instance platform data are updated. This reduces the
    number of times the DT is traversed and works for both DT nodes
    with and without compat string.
---
 drivers/pci/pci-uclass.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index e9671d9b76..ab8818280d 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -733,6 +733,7 @@ int pci_bind_bus_devices(struct udevice *bus)
 	ulong vendor, device;
 	ulong header_type;
 	pci_dev_t bdf, end;
+	ofnode node;
 	bool found_multi;
 	int ret;
 
@@ -803,6 +804,20 @@ int pci_bind_bus_devices(struct udevice *bus)
 		pplat->vendor = vendor;
 		pplat->device = device;
 		pplat->class = class;
+
+		/* Associate optional OF node */
+		dev_for_each_subnode(node, bus) {
+			phys_addr_t df, size;
+			df = ofnode_get_addr_size(node, "reg", &size);
+			if (df == FDT_ADDR_T_NONE)
+				continue;
+
+			if (PCI_FUNC(df) == PCI_FUNC(bdf) &&
+			    PCI_DEV(df) == PCI_DEV(bdf)) {
+				dev->node = node;
+				break;
+			}
+		}
 	}
 
 	return 0;
-- 
2.18.0