diff options
| author | Simon Glass <sjg@chromium.org> | 2017-05-18 20:08:58 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-06-01 07:03:07 -0600 |
| commit | 9e51204527dcae59a326c51a71c9b80effd8db05 (patch) | |
| tree | 6e910da639b0107eb76e050ea5619fe0abe7e4b6 /scripts/Kbuild.include | |
| parent | 911f3aef357ca02ac0d06fdce6a7a3081594f272 (diff) | |
dm: core: Add operations on device tree references
Since U-Boot supports both a live tree and a flat tree, we need an easy
way to access the tree without worrying about which is currently active.
To support this, U-Boot has the concept of an ofnode, which can refer
either to a live tree node or a flat tree node.
For the live tree, the reference contains a pointer to the node (struct
device_node *) or NULL if the node is invalid. For the flat tree, the
reference contains the node offset or -1 if the node is invalid.
Add a basic set of operations using ofnodes. These are implemented by
using either libfdt functions (in the case of a flat DT reference) or
the live-tree of_...() functions.
Note that it is not possible to have both live and flat references active
at the same time. As soon as the live tree is available, everything in
U-Boot should switch to using that. This avoids confusion and allows us to
assume that the type of a reference is simply based on whether we have a
live tree yet, or not.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'scripts/Kbuild.include')
0 files changed, 0 insertions, 0 deletions