diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b2570eb151..bd8b7278ef 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -331,6 +331,31 @@ static void postscan_setup_bridge(struct pci_dev *dev) } } +static struct device_node * +pci_of_match_device(struct device_d *parent, unsigned int devfn) +{ + struct device_node *np; + u32 reg; + + if (!IS_ENABLED(CONFIG_OFTREE) || !parent->device_node) + return NULL; + + for_each_child_of_node(parent->device_node, np) { + if (!of_property_read_u32_array(np, "reg", ®, 1)) { + /* + * Only match device/function pair of the device + * address, other properties are defined by the + * PCI/OF node topology. + */ + reg = (reg >> 8) & 0xffff; + if (reg == devfn) + return np; + } + } + + return NULL; +} + unsigned int pci_scan_bus(struct pci_bus *bus) { struct pci_dev *dev; @@ -368,6 +393,11 @@ unsigned int pci_scan_bus(struct pci_bus *bus) dev->vendor = l & 0xffff; dev->device = (l >> 16) & 0xffff; dev->dev.parent = bus->parent; + dev->dev.device_node = pci_of_match_device(bus->parent, devfn); + if (dev->dev.device_node) + pr_debug("found DT node %s for device %04x:%04x\n", + dev->dev.device_node->full_name, + dev->vendor, dev->device); /* non-destructively determine if device can be a master: */ pci_read_config_byte(dev, PCI_COMMAND, &cmd); |