[RFC PATCH 75/77] tests: fdtaddon: Add a test for addons using namespace label references

[Herve Codina <herve.codina@bootlin.com>]

Namespace label references are labels in the form &foo.bar.baz

Those kind of labels allow to 'jump' from node to node based on
exported symbols defined at each nodes.

Add a test for this feature.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 ...ddon_addon_namespace-merged.dtb.dts.expect | 57 +++++++++++++++++++
 ...fdtaddon_addon_namespace-merged.dtb.expect | 49 ++++++++++++++++
 tests/fdtaddon_addon_namespace.dtba.expect    | 31 ++++++++++
 tests/fdtaddon_addon_namespace.dtsa           | 34 +++++++++++
 tests/fdtaddon_base_namespace.dtb.expect      | 29 ++++++++++
 tests/fdtaddon_base_namespace.dts             | 33 +++++++++++
 tests/run_tests.sh                            | 14 +++++
 7 files changed, 247 insertions(+)
 create mode 100644 tests/fdtaddon_addon_namespace-merged.dtb.dts.expect
 create mode 100644 tests/fdtaddon_addon_namespace-merged.dtb.expect
 create mode 100644 tests/fdtaddon_addon_namespace.dtba.expect
 create mode 100644 tests/fdtaddon_addon_namespace.dtsa
 create mode 100644 tests/fdtaddon_base_namespace.dtb.expect
 create mode 100644 tests/fdtaddon_base_namespace.dts

diff --git a/tests/fdtaddon_addon_namespace-merged.dtb.dts.expect b/tests/fdtaddon_addon_namespace-merged.dtb.dts.expect
new file mode 100644
index 0000000..ff0e5ff
--- /dev/null
+++ b/tests/fdtaddon_addon_namespace-merged.dtb.dts.expect
@@ -0,0 +1,57 @@
+/dts-v1/;
+
+/ {
+
+	other_n1 {
+		prop = <0x00>;
+		phandle = <0x05>;
+
+		/export/ a: &{/other-a};
+		/export/ b: &{/other-b};
+	};
+
+	other-a {
+		prop = <0x00>;
+		phandle = <0x01>;
+
+		addon-node-1a {
+			phandle = <0x06>;
+			prop = <0x1a>;
+		};
+	};
+
+	other-b {
+		prop = <0x00>;
+		phandle = <0x02>;
+
+		/export/ x: &{/other-x};
+	};
+
+	other-x {
+		prop = <0x00>;
+		phandle = <0x03>;
+
+		addon-node-1bx {
+			phandle = <0x07>;
+			prop = <0x1b>;
+		};
+	};
+
+	node {
+		compatible = "abc,aaa";
+		phandle = <0x04>;
+
+		/export/ node: &{/node};
+		/export/ n1: &{/other_n1};
+
+		addon-node2 {
+			ref-addon-n1bx = <&{/other-x/addon-node-1bx}>;
+			ref-n1bx = <&{/other-x}>;
+		};
+
+		addon-node1 {
+			ref-addon-n1a = <&{/other-a/addon-node-1a}>;
+			ref-n1a = <&{/other-a}>;
+		};
+	};
+};
diff --git a/tests/fdtaddon_addon_namespace-merged.dtb.expect b/tests/fdtaddon_addon_namespace-merged.dtb.expect
new file mode 100644
index 0000000..947a088
--- /dev/null
+++ b/tests/fdtaddon_addon_namespace-merged.dtb.expect
@@ -0,0 +1,49 @@
+/dts-v1/;
+
+/ {
+    other_n1 {
+        prop = <0x00000000>;
+        phandle = <0x00000005>;
+        // [FDT_EXPORT_SYM] 'a' -> phandle 0x00000001
+        // [FDT_EXPORT_SYM] 'b' -> phandle 0x00000002
+    };
+    other-a {
+        prop = <0x00000000>;
+        phandle = <0x00000001>;
+        addon-node-1a {
+            phandle = <0x00000006>;
+            prop = <0x0000001a>;
+        };
+    };
+    other-b {
+        prop = <0x00000000>;
+        phandle = <0x00000002>;
+        // [FDT_EXPORT_SYM] 'x' -> phandle 0x00000003
+    };
+    other-x {
+        prop = <0x00000000>;
+        phandle = <0x00000003>;
+        addon-node-1bx {
+            phandle = <0x00000007>;
+            prop = <0x0000001b>;
+        };
+    };
+    node {
+        compatible = "abc,aaa";
+        phandle = <0x00000004>;
+        // [FDT_EXPORT_SYM] 'node' -> phandle 0x00000004
+        // [FDT_EXPORT_SYM] 'n1' -> phandle 0x00000005
+        addon-node2 {
+            ref-addon-n1bx = <0x00000007>;
+            // [FDT_REF_LOCAL] ref-addon-n1bx[0]
+            ref-n1bx = <0x00000003>;
+            // [FDT_REF_LOCAL] ref-n1bx[0]
+        };
+        addon-node1 {
+            ref-addon-n1a = <0x00000006>;
+            // [FDT_REF_LOCAL] ref-addon-n1a[0]
+            ref-n1a = <0x00000001>;
+            // [FDT_REF_LOCAL] ref-n1a[0]
+        };
+    };
+};
diff --git a/tests/fdtaddon_addon_namespace.dtba.expect b/tests/fdtaddon_addon_namespace.dtba.expect
new file mode 100644
index 0000000..426bfe0
--- /dev/null
+++ b/tests/fdtaddon_addon_namespace.dtba.expect
@@ -0,0 +1,31 @@
+/dts-v1/;
+/addon/;
+
+// [FDT_IMPORT_SYM] 'node' (abc,aaa)
+// [FDT_IMPORT_SYM] 'n1' ()
+&node {
+    addon-node1 {
+        ref-n1a = <0xffffffff>;
+        // [FDT_REF_PHANDLE] ref-n1a[0], ref = n1.a
+        ref-addon-n1a = <0x00000001>;
+        // [FDT_REF_LOCAL] ref-addon-n1a[0]
+    };
+    addon-node2 {
+        ref-n1bx = <0xffffffff>;
+        // [FDT_REF_PHANDLE] ref-n1bx[0], ref = n1.b.x
+        ref-addon-n1bx = <0x00000002>;
+        // [FDT_REF_LOCAL] ref-addon-n1bx[0]
+    };
+};
+&n1.a {
+    addon-node-1a {
+        prop = <0x0000001a>;
+        phandle = <0x00000001>;
+    };
+};
+&n1.b.x {
+    addon-node-1bx {
+        prop = <0x0000001b>;
+        phandle = <0x00000002>;
+    };
+};
diff --git a/tests/fdtaddon_addon_namespace.dtsa b/tests/fdtaddon_addon_namespace.dtsa
new file mode 100644
index 0000000..8c25d3d
--- /dev/null
+++ b/tests/fdtaddon_addon_namespace.dtsa
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * Copyright (C) 2026 Bootlin
+ */
+
+/dts-v1/;
+/addon/;
+
+/import/ node: "abc,aaa";
+/import/ n1: "";
+
+&node {
+	addon-node1 {
+		ref-n1a = <&n1.a>;
+		ref-addon-n1a = <&addon_n1a>;
+	};
+
+	addon-node2 {
+		ref-n1bx = <&n1.b.x>;
+		ref-addon-n1bx = <&addon_n1bx>;
+	};
+};
+
+&n1.a {
+	addon_n1a: addon-node-1a {
+		prop = <0x1a>;
+	};
+};
+
+&n1.b.x {
+	addon_n1bx: addon-node-1bx {
+		prop = <0x1b>;
+	};
+};
diff --git a/tests/fdtaddon_base_namespace.dtb.expect b/tests/fdtaddon_base_namespace.dtb.expect
new file mode 100644
index 0000000..8383ab0
--- /dev/null
+++ b/tests/fdtaddon_base_namespace.dtb.expect
@@ -0,0 +1,29 @@
+/dts-v1/;
+
+/ {
+    other_n1 {
+        prop = <0x00000000>;
+        phandle = <0x00000005>;
+        // [FDT_EXPORT_SYM] 'a' -> phandle 0x00000001
+        // [FDT_EXPORT_SYM] 'b' -> phandle 0x00000002
+    };
+    other-a {
+        prop = <0x00000000>;
+        phandle = <0x00000001>;
+    };
+    other-b {
+        prop = <0x00000000>;
+        phandle = <0x00000002>;
+        // [FDT_EXPORT_SYM] 'x' -> phandle 0x00000003
+    };
+    other-x {
+        prop = <0x00000000>;
+        phandle = <0x00000003>;
+    };
+    node {
+        compatible = "abc,aaa";
+        phandle = <0x00000004>;
+        // [FDT_EXPORT_SYM] 'node' -> phandle 0x00000004
+        // [FDT_EXPORT_SYM] 'n1' -> phandle 0x00000005
+    };
+};
diff --git a/tests/fdtaddon_base_namespace.dts b/tests/fdtaddon_base_namespace.dts
new file mode 100644
index 0000000..e2bc4f0
--- /dev/null
+++ b/tests/fdtaddon_base_namespace.dts
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * Copyright (C) 2026 Bootlin
+ */
+
+/dts-v1/;
+
+/ {
+	n1: other_n1 {
+		prop = <0>;
+		/export/ a: &other_a;
+		/export/ b: &other_b;
+	};
+
+	other_a: other-a {
+		prop = <0>;
+	};
+
+	other_b: other-b {
+		prop = <0>;
+		/export/ x: &other_x;
+	};
+
+	other_x: other-x {
+		prop = <0>;
+	};
+
+	node: node {
+		compatible = "abc,aaa";
+		/export/ node: &node;
+		/export/ n1: &n1;
+	};
+};
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 65b1abe..2cdfd89 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -1207,6 +1207,20 @@ fdtaddon_tests() {
 		run_dtc_test -I dtb -O dts -o $dt-merged2.dtb.dts $dt-merged2.dtb
 		check_dts $dt-merged2.dtb.dts
 	done
+
+	# Test namespace label reference
+	run_dtc_test -I dts -O dtb -o fdtaddon_base_namespace.dtb "$SRCDIR/fdtaddon_base_namespace.dts"
+	check_dtb fdtaddon_base_namespace.dtb
+
+	run_dtc_test -I dts -O dtb -o fdtaddon_addon_namespace.dtba "$SRCDIR/fdtaddon_addon_namespace.dtsa"
+	check_dtb fdtaddon_addon_namespace.dtba
+
+	run_fdtaddon_test -i fdtaddon_base_namespace.dtb -o fdtaddon_addon_namespace-merged.dtb \
+			  -t "/node" fdtaddon_addon_namespace.dtba
+	check_dtb fdtaddon_addon_namespace-merged.dtb
+
+	run_dtc_test -I dtb -O dts -o fdtaddon_addon_namespace-merged.dtb.dts fdtaddon_addon_namespace-merged.dtb
+	check_dts fdtaddon_addon_namespace-merged.dtb.dts
 }
 
 pylibfdt_tests () {
-- 
2.52.0