summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--src/device/device_const.c27
-rw-r--r--src/include/device/device.h4
2 files changed, 31 insertions, 0 deletions
diff --git a/src/device/device_const.c b/src/device/device_const.c
index 12d5386d22..79f025da97 100644
--- a/src/device/device_const.c
+++ b/src/device/device_const.c
@@ -196,6 +196,33 @@ DEVTREE_CONST struct device *find_dev_path(
return child;
}
+/**
+ * Find the device structure given an array of nested device paths,
+ *
+ * @param parent The parent bus to start the search on.
+ * @param nested_path An array of relative paths from the parent bus to the target device.
+ * @param nested_path_length Number of path elements in nested_path array.
+ * @return Pointer to a device structure for the device at nested path
+ * or 0/NULL if no device is found.
+ */
+DEVTREE_CONST struct device *find_dev_nested_path(
+ const struct bus *parent, const struct device_path nested_path[],
+ size_t nested_path_length)
+{
+ DEVTREE_CONST struct device *child;
+
+ if (!parent || !nested_path || !nested_path_length)
+ return NULL;
+
+ child = find_dev_path(parent, nested_path);
+
+ /* Terminate recursion at end of nested path or child not found */
+ if (nested_path_length == 1 || !child)
+ return child;
+
+ return find_dev_nested_path(child->link_list, nested_path + 1, nested_path_length - 1);
+}
+
DEVTREE_CONST struct device *pcidev_path_behind(
const struct bus *parent, pci_devfn_t devfn)
{
diff --git a/src/include/device/device.h b/src/include/device/device.h
index 317785429d..b53b64a329 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -207,6 +207,10 @@ void run_bios(struct device *dev, unsigned long addr);
DEVTREE_CONST struct device *find_dev_path(
const struct bus *parent,
const struct device_path *path);
+DEVTREE_CONST struct device *find_dev_nested_path(
+ const struct bus *parent,
+ const struct device_path nested_path[],
+ size_t nested_path_length);
struct device *alloc_find_dev(struct bus *parent, struct device_path *path);
struct device *dev_find_device(u16 vendor, u16 device, struct device *from);
struct device *dev_find_class(unsigned int class, struct device *from);