fdt: Allow more general use of livetree
At present livetree can only be used for the control FDT. It is useful
to be able to use the ofnode API for other FDTs, e.g. those used by
the upcoming configuration editor.
We already have most of the support present, and tests can be marked with
the UT_TESTF_OTHER_FDT flag to use another FDT as a special case. But
with this change, the functionality becomes more generally available.
Plumb in the require support.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index dee890b..8df16e5 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -12,6 +12,7 @@
#include <fdt_support.h>
#include <log.h>
#include <malloc.h>
+#include <of_live.h>
#include <linux/libfdt.h>
#include <dm/of_access.h>
#include <dm/of_addr.h>
@@ -51,6 +52,20 @@
oftree tree;
int i;
+ if (of_live_active()) {
+ struct device_node *root;
+ int ret;
+
+ ret = unflatten_device_tree(fdt, &root);
+ if (ret) {
+ log_err("Failed to create live tree: err=%d\n", ret);
+ return oftree_null();
+ }
+ tree = oftree_from_np(root);
+
+ return tree;
+ }
+
if (gd->flags & GD_FLG_RELOC) {
i = oftree_find(fdt);
if (i == -1) {
@@ -60,11 +75,6 @@
return oftree_null();
}
- if (of_live_active()) {
- log_err("Cannot register a flattree when OF_LIVE is active\n");
- return oftree_null();
- }
-
/* register the new tree */
i = oftree_count++;
oftree_list[i] = fdt;
@@ -82,6 +92,12 @@
return tree;
}
+void oftree_dispose(oftree tree)
+{
+ if (of_live_active())
+ of_live_free(tree.np);
+}
+
void *ofnode_lookup_fdt(ofnode node)
{
if (gd->flags & GD_FLG_RELOC) {
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 443db62..0f38b3e 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -353,6 +353,16 @@
}
/**
+ * oftree_dispose() - Dispose of an oftree
+ *
+ * This can be used to dispose of a tree that has been created (other than
+ * the control FDT which must not be disposed)
+ *
+ * @tree: Tree to dispose
+ */
+void oftree_dispose(oftree tree);
+
+/**
* ofnode_name_eq() - Check if the node name is equivalent to a given name
* ignoring the unit address
*
diff --git a/include/of_live.h b/include/of_live.h
index f59d6af..05e86ac 100644
--- a/include/of_live.h
+++ b/include/of_live.h
@@ -36,4 +36,14 @@
*/
int unflatten_device_tree(const void *blob, struct device_node **mynodes);
+/**
+ * of_live_free() - Dispose of a livetree
+ *
+ * This frees memory used by the tree, after which @root becomes invalid and
+ * cannot be used
+ *
+ * @root: Tree to dispose
+ */
+void of_live_free(struct device_node *root);
+
#endif
diff --git a/lib/of_live.c b/lib/of_live.c
index 05588d5..25f7af6 100644
--- a/lib/of_live.c
+++ b/lib/of_live.c
@@ -330,3 +330,9 @@
return ret;
}
+
+void of_live_free(struct device_node *root)
+{
+ /* the tree is stored as a contiguous block of memory */
+ free(root);
+}
diff --git a/test/dm/ofnode.c b/test/dm/ofnode.c
index 64baaf6..6fbebc7 100644
--- a/test/dm/ofnode.c
+++ b/test/dm/ofnode.c
@@ -1266,3 +1266,22 @@
return 0;
}
DM_TEST(dm_test_livetree_align, UT_TESTF_LIVE_TREE);
+
+/* check that it is possible to load an arbitrary livetree */
+static int dm_test_livetree_ensure(struct unit_test_state *uts)
+{
+ oftree tree;
+ ofnode node;
+
+ /* read from other.dtb */
+ ut_assertok(test_load_other_fdt(uts));
+ tree = oftree_from_fdt(uts->other_fdt);
+ ut_assert(oftree_valid(tree));
+ node = oftree_path(tree, "/node/subnode");
+ ut_assert(ofnode_valid(node));
+ ut_asserteq_str("sandbox-other2",
+ ofnode_read_string(node, "compatible"));
+
+ return 0;
+}
+DM_TEST(dm_test_livetree_ensure, 0);