pci: Support parsing PCI controller DT subnodes

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@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

drivers/pci/pci-uclass.c

@@ -90,6 +90,27 @@ int pci_get_ff(enum pci_size_t size)
 	}
 }
 
+static void pci_dev_find_ofnode(struct udevice *bus, phys_addr_t bdf,
+				ofnode *rnode)
+{
+	struct fdt_pci_addr addr;
+	ofnode node;
+	int ret;
+
+	dev_for_each_subnode(node, bus) {
+		ret = ofnode_read_pci_addr(node, FDT_PCI_SPACE_CONFIG, "reg",
+					   &addr);
+		if (ret)
+			continue;
+
+		if (PCI_MASK_BUS(addr.phys_hi) != PCI_MASK_BUS(bdf))
+			continue;
+
+		*rnode = node;
+		break;
+	}
+};
+
 int pci_bus_find_devfn(struct udevice *bus, pci_dev_t find_devfn,
 		       struct udevice **devp)
 {
@@ -641,6 +662,7 @@ static int pci_find_and_bind_driver(struct udevice *parent,
 				    pci_dev_t bdf, struct udevice **devp)
 {
 	struct pci_driver_entry *start, *entry;
+	ofnode node = ofnode_null();
 	const char *drv;
 	int n_ents;
 	int ret;
@@ -651,6 +673,10 @@ static int pci_find_and_bind_driver(struct udevice *parent,
 
 	debug("%s: Searching for driver: vendor=%x, device=%x\n", __func__,
 	      find_id->vendor, find_id->device);
+
+	/* Determine optional OF node */
+	pci_dev_find_ofnode(parent, bdf, &node);
+
 	start = ll_entry_start(struct pci_driver_entry, pci_driver_entry);
 	n_ents = ll_entry_count(struct pci_driver_entry, pci_driver_entry);
 	for (entry = start; entry != start + n_ents; entry++) {
@@ -684,8 +710,8 @@ static int pci_find_and_bind_driver(struct udevice *parent,
 			 * find another driver. For now this doesn't seem
 			 * necesssary, so just bind the first match.
 			 */
-			ret = device_bind(parent, drv, drv->name, NULL, -1,
-					  &dev);
+			ret = device_bind_ofnode(parent, drv, drv->name, NULL,
+						 node, &dev);
 			if (ret)
 				goto error;
 			debug("%s: Match found: %s\n", __func__, drv->name);
@@ -712,7 +738,7 @@ static int pci_find_and_bind_driver(struct udevice *parent,
 		return -ENOMEM;
 	drv = bridge ? "pci_bridge_drv" : "pci_generic_drv";
 
-	ret = device_bind_driver(parent, drv, str, devp);
+	ret = device_bind_driver_to_node(parent, drv, str, node, devp);
 	if (ret) {
 		debug("%s: Failed to bind generic driver: %d\n", __func__, ret);
 		free(str);