2 * PCI <-> OF mapping helpers
4 * Copyright 2011 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/pci.h>
15 #include <linux/of_pci.h>
18 void pci_set_of_node(struct pci_dev *dev)
20 if (!dev->bus->dev.of_node)
22 dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,
26 void pci_release_of_node(struct pci_dev *dev)
28 of_node_put(dev->dev.of_node);
29 dev->dev.of_node = NULL;
32 void pci_set_bus_of_node(struct pci_bus *bus)
34 if (bus->self == NULL)
35 bus->dev.of_node = pcibios_get_phb_of_node(bus);
37 bus->dev.of_node = of_node_get(bus->self->dev.of_node);
40 void pci_release_bus_of_node(struct pci_bus *bus)
42 of_node_put(bus->dev.of_node);
43 bus->dev.of_node = NULL;
46 struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
48 /* This should only be called for PHBs */
49 if (WARN_ON(bus->self || bus->parent))
52 /* Look for a node pointer in either the intermediary device we
53 * create above the root bus or it's own parent. Normally only
54 * the later is populated.
56 if (bus->bridge->of_node)
57 return of_node_get(bus->bridge->of_node);
58 if (bus->bridge->parent && bus->bridge->parent->of_node)
59 return of_node_get(bus->bridge->parent->of_node);