of: Add device tree selftests

Add some runtime test cases for the library of device tree parsing functions.

v2: - Add testcase for phandle with 0 args
    - Don't run testcases if testcase data isn't present in device tree

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

3 files changed, 40 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/testcases/tests-phandle.dtsi b/arch/arm/boot/dts/testcases/tests-phandle.dtsi
new file mode 100644
index 000000000000..ec0c4e6212c9
--- /dev/null
+++ b/arch/arm/boot/dts/testcases/tests-phandle.dtsi
@@ -0,0 +1,37 @@
+
+/ {
+        testcase-data {
+                phandle-tests {
+                        provider0: provider0 {
+                                #phandle-cells = <0>;
+                        };
+
+                        provider1: provider1 {
+                                #phandle-cells = <1>;
+                        };
+
+                        provider2: provider2 {
+                                #phandle-cells = <2>;
+                        };
+
+                        provider3: provider3 {
+                                #phandle-cells = <3>;
+                        };
+
+                        consumer-a {
+                                phandle-list =  <&provider1 1>,
+                                                <&provider2 2 0>,
+                                                <0>,
+                                                <&provider3 4 4 3>,
+                                                <&provider2 5 100>,
+                                                <&provider0>,
+                                                <&provider1 7>;
+                                phandle-list-names = "first", "second", "third";
+
+                                phandle-list-bad-phandle = <12345678 0 0>;
+                                phandle-list-bad-args = <&provider2 1 0>,
+                                                        <&provider3 0>;
+                        };
+                };
+        };
+};
diff --git a/arch/arm/boot/dts/testcases/tests.dtsi b/arch/arm/boot/dts/testcases/tests.dtsi
new file mode 100644
index 000000000000..a7c5067622e8
--- /dev/null
+++ b/arch/arm/boot/dts/testcases/tests.dtsi
@@ -0,0 +1 @@
+/include/ "tests-phandle.dtsi"
diff --git a/arch/arm/boot/dts/versatile-pb.dts b/arch/arm/boot/dts/versatile-pb.dts
index 8a614e398004..166461073b78 100644
--- a/arch/arm/boot/dts/versatile-pb.dts
+++ b/arch/arm/boot/dts/versatile-pb.dts
@@ -46,3 +46,5 @@
                 };
         };
 };
+
+/include/ "testcases/tests.dtsi"