dm: core: Support writing a boolean

Add functions to write a boolean property. This involves deleting it if
the value is false.

Add a new ofnode_has_property() as well. Add a comment about the behaviour
of of_read_property() when the property value is empty.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/test/dm/ofnode.c b/test/dm/ofnode.c
index ceeb8e5..9477f79 100644
--- a/test/dm/ofnode.c
+++ b/test/dm/ofnode.c
@@ -1480,3 +1480,28 @@ static int dm_test_oftree_to_fdt(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_oftree_to_fdt, UT_TESTF_SCAN_FDT);
+
+/* test ofnode_read_bool() and ofnode_write_bool() */
+static int dm_test_bool(struct unit_test_state *uts)
+{
+	const char *propname = "missing-bool-value";
+	ofnode node;
+
+	node = ofnode_path("/a-test");
+	ut_assert(ofnode_read_bool(node, "bool-value"));
+	ut_assert(!ofnode_read_bool(node, propname));
+	ut_assert(!ofnode_has_property(node, propname));
+
+	ut_assertok(ofnode_write_bool(node, propname, true));
+	ut_assert(ofnode_read_bool(node, propname));
+	ut_assert(ofnode_has_property(node, propname));
+	ut_assert(ofnode_read_bool(node, "bool-value"));
+
+	ut_assertok(ofnode_write_bool(node, propname, false));
+	ut_assert(!ofnode_read_bool(node, propname));
+	ut_assert(!ofnode_has_property(node, propname));
+	ut_assert(ofnode_read_bool(node, "bool-value"));
+
+	return 0;
+}
+DM_TEST(dm_test_bool, UT_TESTF_SCAN_FDT);