support/testing: add new test for dtc

Add a test that runs the dtc commandline tools. To test devicetree
compilation, we use an example devicetree from the dtc project. The
example source is GPL-2.0+ licensed.

Signed-off-by: Brandon Maier <brandon.maier@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 9b69034160)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/testing/tests/package/test_dtc.py

@@ -0,0 +1,39 @@
+import os
+
+import infra.basetest
+
+
+class TestDtc(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_DTC=y
+        BR2_PACKAGE_DTC_PROGRAMS=y
+        BR2_ROOTFS_OVERLAY="{}"
+        # BR2_TARGET_ROOTFS_TAR is not set
+        BR2_TARGET_ROOTFS_CPIO=y
+        """.format(
+           # overlay to add a bats test suite
+           infra.filepath("tests/package/test_dtc/rootfs-overlay"))
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv7",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+
+        self.emulator.login()
+
+        # Test 'dtc'
+        self.assertRunOk("dtc -I dts -O dtb -o /tmp/test_tree1.dtb /test_tree1.dts")
+
+        # Test 'fdtdump'
+        self.assertRunOk("fdtdump /tmp/test_tree1.dtb")
+
+        # Test 'fdtget'
+        out, exit_code = self.emulator.run("fdtget -t s /tmp/test_tree1.dtb / compatible")
+        self.assertEqual(out[0].strip(), "test_tree1")
+
+        # Test 'fdtput'
+        self.assertRunOk("fdtput -t s /tmp/test_tree1.dtb / compatible 'test set compatible'")
+        out, exit_code = self.emulator.run("fdtget -t s /tmp/test_tree1.dtb / compatible")
+        self.assertEqual(out[0].strip(), "test set compatible")

support/testing/tests/package/test_dtc/rootfs-overlay/test_tree1.dts

@@ -0,0 +1,48 @@
+/* From https://git.kernel.org/pub/scm/utils/dtc/dtc.git/tree/tests/test_tree1.dts?id=99031e3a4a6e479466ae795790b44727434ca27d */
+
+/dts-v1/;
+
+/memreserve/ 0xdeadbeef00000000 0x100000;
+/memreserve/ 123456789 010000;
+
+/ {
+	compatible = "test_tree1";
+	prop-int = <0xdeadbeef>;
+	prop-int64 = /bits/ 64 <0xdeadbeef01abcdef>;
+	prop-str = "hello world";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	subnode@1 {
+		compatible = "subnode1";
+		reg = <1>;
+		prop-int = [deadbeef];
+
+		subsubnode {
+			compatible = "subsubnode1", "subsubnode";
+			placeholder = "this is a placeholder string", "string2";
+			prop-int = <0xdeadbeef>;
+		};
+
+		ss1 {
+		};
+	};
+
+	subnode@2 {
+		reg = <2>;
+		linux,phandle = <0x2000>;
+		prop-int = <123456789>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ssn0: subsubnode@0 {
+			reg = <0>;
+			phandle = <0x2001>;
+			compatible = "subsubnode2", "subsubnode";
+			prop-int = <0726746425>;
+		};
+
+		ss2 {
+		};
+	};
+};