tests: More thorough tests of libfdt overlay application without dtc

At the moment we have some rudimentary tests of the fdt_overlay_apply()
function which don't rely on overlay generation support in dtc.  This is
done by avoiding any external references in the sample overlay, in
particularly using the 'target-path' syntax instead of 'target' to avoid
needing external references in the fragment targets.  Thus this test case
doesn't exercise libfdt's processing of the __fixups__ node at all.

We do test that somewhat in combination with dtc's overlay support.
However, in the interests of being able to quickly determine which side a
bug is on, it would be nice to exercise this without requiring the dtc
support.

This adds testcases to do so, by making some examples with manually
constructed __symbols__ and __fixups__ nodes.  In addition we rename some
of the test data files and add some extra check_path tests to make it a bit
clearer what's going on here.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 112 insertions, 0 deletions

diff --git a/tests/overlay_overlay_manual_fixups.dts b/tests/overlay_overlay_manual_fixups.dts
new file mode 100644
index 0000000..e34c4fc
--- /dev/null
+++ b/tests/overlay_overlay_manual_fixups.dts
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2016 NextThing Co
+ * Copyright (c) 2016 Free Electrons
+ * Copyright (c) 2016 Konsulko Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/dts-v1/;
+
+/* Note no /plugin/ tag - we're manually generating the metadata for
+   testing purposes */
+
+/ {
+	/* Test that we can change an int by another */
+	fragment@0 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			test-int-property = <43>;
+		};
+	};
+
+	/* Test that we can replace a string by a longer one */
+	fragment@1 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			test-str-property = "foobar";
+		};
+	};
+
+	/* Test that we add a new property */
+	fragment@2 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			test-str-property-2 = "foobar2";
+		};
+	};
+
+	/* Test that we add a new node (by phandle) */
+	fragment@3 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			new-node {
+				new-property;
+			};
+		};
+	};
+
+	fragment@5 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			local: new-local-node {
+				new-property;
+			};
+		};
+	};
+
+	fragment@6 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			test-phandle = <0xffffffff /*&test*/>, <&local>;
+		};
+	};
+
+	fragment@7 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			test-several-phandle = <&local>, <&local>;
+		};
+	};
+
+	fragment@8 {
+		target = <0xffffffff /*&test*/>;
+
+		__overlay__ {
+			sub-test-node {
+				new-sub-test-property;
+			};
+		};
+	};
+
+	__local_fixups__ {
+		fragment@6 {
+			__overlay__ {
+				test-phandle = <4>;
+			};
+		};
+		fragment@7 {
+			__overlay__ {
+				test-several-phandle = <0 4>;
+			};
+		};
+	};
+	__fixups__ {
+		test = "/fragment@0:target:0",
+		       "/fragment@1:target:0",
+		       "/fragment@2:target:0",
+		       "/fragment@3:target:0",
+		       "/fragment@5:target:0",
+		       "/fragment@6:target:0",
+		       "/fragment@6/__overlay__:test-phandle:0",
+		       "/fragment@7:target:0",
+		       "/fragment@8:target:0";
+	};
+};