Within /chosen we may have a node which points to another node, similar
to how /aliases works. Add a helper function to do this lookup.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v5:
- Add new patch to add a function to look up a chosen node
Changes in v4: None
Changes in v3: None
Changes in v2: None
include/fdtdec.h | 12 ++++++++++++
lib/fdtdec.c | 15 +++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 5f88938..2590d30 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -376,6 +376,18 @@ int fdtdec_get_alias_seq(const void *blob, const char
*base, int node,
*/
int fdtdec_get_alias_node(const void *blob, const char *name);
+/**
+ * Get the offset of the given chosen node
+ *
+ * This looks up a property in /chosen containing the path to another node,
+ * then finds the offset of that node.
+ *
+ * @param blob Device tree blob (if NULL, then error is returned)
+ * @param name Property name, e.g. "stdout-path"
+ * @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
+ */
+int fdtdec_get_chosen_node(const void *blob, const char *name);
+
/*
* Get the name for a compatible ID
*
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index c2f3645..06d4542 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -382,6 +382,21 @@ int fdtdec_get_alias_node(const void *blob, const char
*name)
return fdt_path_offset(blob, prop);
}
+int fdtdec_get_chosen_node(const void *blob, const char *name)
+{
+ const char *prop;
+ int chosen_node;
+ int len;
+
+ if (!blob)
+ return -FDT_ERR_NOTFOUND;
+ chosen_node = fdt_path_offset(blob, "/chosen");
+ prop = fdt_getprop(blob, chosen_node, name, &len);
+ if (!prop)
+ return -FDT_ERR_NOTFOUND;
+ return fdt_path_offset(blob, prop);
+}
+
int fdtdec_check_fdt(void)
{
/*
--
2.1.0.rc2.206.gedb03e5
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