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authorRob Barnes <robbarnes@google.com>2020-07-23 08:25:42 -0600
committerPatrick Georgi <pgeorgi@google.com>2020-07-28 19:28:22 +0000
commita223e65db2e9d4c82bb8aac29281500b8e645a97 (patch)
tree8222b0e26679d67f73085fdd247771ac1c4aeba5 /src/device/device_const.c
parente7e6c4e1d78c78e4bf5869d2329949bdaf80ad56 (diff)
downloadcoreboot-a223e65db2e9d4c82bb8aac29281500b8e645a97.tar.xz
device: Add find_dev_nested_path helper function
Add find_dev_nested_path helper function to simplify finding deeply nested devices. BUG=b:157580724 TEST=Find bluetooth device on dalboz Change-Id: I48fa5fcad0030fb6dcea97b9fc76e1d3d3f9b28f Signed-off-by: Rob Barnes <robbarnes@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/43776 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Raul Rangel <rrangel@chromium.org>
Diffstat (limited to 'src/device/device_const.c')
-rw-r--r--src/device/device_const.c27
1 files changed, 27 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)
{