diff options
Diffstat (limited to 'drivers/of/device.c')
-rw-r--r-- | drivers/of/device.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c index 1ca42ad9dd15..6e9572c4af83 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -304,3 +304,44 @@ int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env * return 0; } EXPORT_SYMBOL_GPL(of_device_uevent_modalias); + +/** + * of_device_make_bus_id - Use the device node data to assign a unique name + * @dev: pointer to device structure that is linked to a device tree node + * + * This routine will first try using the translated bus address to + * derive a unique name. If it cannot, then it will prepend names from + * parent nodes until a unique name can be derived. + */ +void of_device_make_bus_id(struct device *dev) +{ + struct device_node *node = dev->of_node; + const __be32 *reg; + u64 addr; + u32 mask; + + /* Construct the name, using parent nodes if necessary to ensure uniqueness */ + while (node->parent) { + /* + * If the address can be translated, then that is as much + * uniqueness as we need. Make it the first component and return + */ + reg = of_get_property(node, "reg", NULL); + if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { + if (!of_property_read_u32(node, "mask", &mask)) + dev_set_name(dev, dev_name(dev) ? "%llx.%x.%pOFn:%s" : "%llx.%x.%pOFn", + addr, ffs(mask) - 1, node, dev_name(dev)); + + else + dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", + addr, node, dev_name(dev)); + return; + } + + /* format arguments only used if dev_name() resolves to NULL */ + dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", + kbasename(node->full_name), dev_name(dev)); + node = node->parent; + } +} +EXPORT_SYMBOL_GPL(of_device_make_bus_id); |