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device_tree: Add support for aliases

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This patch adds support to lookup nodes via the "/aliases" mechanism in
device trees. This may be required for overlay support (don't quite
remember tbh) and is also just a generally useful feature. It was
adapted from depthcharge's http://crosreview.com/1249703 and
http://crosreview.com/1542702.

Change-Id: I1289ab2f02c4877a2d0111040384827e2b48a34a
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32866
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Julius Werner
2019-05-06 19:23:28 -07:00
committed by Patrick Georgi
parent fbec63d15f
commit 6d5695fac5
2 changed files with 77 additions and 12 deletions
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3
src/include/device_tree.h
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@ -146,6 +146,9 @@ struct device_tree_node *dt_find_node_by_phandle(struct device_tree_node *root,
// represented as a string of '/' separated node names.
struct device_tree_node *dt_find_node_by_path(struct device_tree *tree,
const char *path, u32 *addrcp, u32 *sizecp, int create);
// Look up a node through an alias.
struct device_tree_node *dt_find_node_by_alias(struct device_tree *tree,
const char *alias);
// Look up a node relative to a parent node, through its compatible string.
struct device_tree_node *dt_find_compat(struct device_tree_node *parent, const char *compatible);
// Look up the next child of a parent node, through its compatible string. It