x86/kprobes: Fix crash when probing CS CALL instructionsgrafted

When using eBPF to probe CS CALL instructions within a function,
a crash can be triggered.

The eBPF tool probes offset 257 of the __hrtimer_run_queues()
function:

<__hrtimer_run_queues+249>:  nopl   0x0(%rax,%rax,1)
<__hrtimer_run_queues+254>:  mov    %r14,%rdi
<__hrtimer_run_queues+257>:  cs call <__x86_indirect_thunk_r12>
<__hrtimer_run_queues+263>:  mov    %eax,%r12d
<__hrtimer_run_queues+266>:  xchg   %ax,%ax
<__hrtimer_run_queues+268>:  mov    %r13,%rdi

Which triggers this crash:

  BUG: unable to handle page fault for address: 00000000000f41c9
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: 0002 [#1] SMP NOPTI
  CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P
  RIP: 0010:__hrtimer_run_queues+0x106/0x230

Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is
at the 6th byte of the above CS CALL instruction. Since the CS CALL
instruction occupies 6 bytes, the exception occurred in the middle of that
call instruction.

The root cause is that when using eBPF tools to probe in the middle of a
function, a kprobe with INT3 is used as the underlying implementation.

During single-step emulation of the original CALL instruction,
int3_emulate_call() assumes that the probed CALL instruction is 5 bytes
long. However, the actual CS-prefixed CALL instruction occupies 6 bytes,
so it constructs an incorrect exception return address. When the CPU
returns from the kprobe handler, the next instruction to be executed is at
the address of the last byte of that CS CALL instruction. Coincidentally,
starting from that address, the CPU fetches and decodes a completely
different instruction, which ultimately triggers a kernel crash.

Fix the issue by using the actual instruction length obtained from
the instruction decoder when constructing the exception return
address, rather than relying on the hardcoded CALL_INSN_SIZE macro.

[ mingo: Refined the changelog ]

Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Jinke Han <jinkehan@didiglobal.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000

47 files changed, 1395 insertions, 0 deletions

diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
new file mode 100644
index 000000000..01a966e39
--- /dev/null
+++ b/drivers/of/unittest-data/Makefile
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-y += testcases.dtbo.o
+
+obj-$(CONFIG_OF_OVERLAY) += overlay.dtbo.o \
+			    overlay_0.dtbo.o \
+			    overlay_1.dtbo.o \
+			    overlay_2.dtbo.o \
+			    overlay_3.dtbo.o \
+			    overlay_4.dtbo.o \
+			    overlay_5.dtbo.o \
+			    overlay_6.dtbo.o \
+			    overlay_7.dtbo.o \
+			    overlay_8.dtbo.o \
+			    overlay_9.dtbo.o \
+			    overlay_10.dtbo.o \
+			    overlay_11.dtbo.o \
+			    overlay_12.dtbo.o \
+			    overlay_13.dtbo.o \
+			    overlay_15.dtbo.o \
+			    overlay_16.dtbo.o \
+			    overlay_17.dtbo.o \
+			    overlay_18.dtbo.o \
+			    overlay_19.dtbo.o \
+			    overlay_20.dtbo.o \
+			    overlay_bad_add_dup_node.dtbo.o \
+			    overlay_bad_add_dup_prop.dtbo.o \
+			    overlay_bad_phandle.dtbo.o \
+			    overlay_bad_symbol.dtbo.o \
+			    overlay_base.dtbo.o \
+			    overlay_gpio_01.dtbo.o \
+			    overlay_gpio_02a.dtbo.o \
+			    overlay_gpio_02b.dtbo.o \
+			    overlay_gpio_03.dtbo.o \
+			    overlay_gpio_04a.dtbo.o \
+			    overlay_gpio_04b.dtbo.o \
+			    overlay_pci_node.dtbo.o \
+			    overlay_bad_unresolved.dtbo.o
+
+# enable creation of __symbols__ node
+DTC_FLAGS_overlay += -@
+DTC_FLAGS_overlay_bad_phandle += -@
+DTC_FLAGS_overlay_bad_symbol += -@
+DTC_FLAGS_overlay_base += -@
+DTC_FLAGS_testcases += -@
+
+# suppress warnings about intentional errors
+DTC_FLAGS_testcases += -Wno-interrupts_property \
+	-Wno-node_name_vs_property_name \
+	-Wno-interrupt_map
+
+# Apply overlays statically with fdtoverlay.  This is a build time test that
+# the overlays can be applied successfully by fdtoverlay.  This does not
+# guarantee that the overlays can be applied successfully at run time by
+# unittest, but it provides a bit of build time test coverage for those
+# who do not execute unittest.
+#
+# The overlays are applied on top of static_base_1.dtb and static_base_2.dtb to
+# create static_test_1.dtb and static_test_2.dtb.  If fdtoverlay detects an
+# error than the kernel build will fail.  static_test_1.dtb and
+# static_test_2.dtb are not consumed by unittest.
+#
+# Some unittest overlays deliberately contain errors that unittest checks for.
+# These overlays will cause fdtoverlay to fail, and are thus not included
+# in the static test:
+#			  overlay_bad_add_dup_node.dtbo \
+#			  overlay_bad_add_dup_prop.dtbo \
+#			  overlay_bad_phandle.dtbo \
+#			  overlay_bad_symbol.dtbo \
+
+apply_static_overlay_1 := overlay_0.dtbo \
+			  overlay_1.dtbo \
+			  overlay_2.dtbo \
+			  overlay_3.dtbo \
+			  overlay_4.dtbo \
+			  overlay_5.dtbo \
+			  overlay_6.dtbo \
+			  overlay_7.dtbo \
+			  overlay_8.dtbo \
+			  overlay_9.dtbo \
+			  overlay_10.dtbo \
+			  overlay_11.dtbo \
+			  overlay_12.dtbo \
+			  overlay_13.dtbo \
+			  overlay_15.dtbo \
+			  overlay_16.dtbo \
+			  overlay_17.dtbo \
+			  overlay_18.dtbo \
+			  overlay_19.dtbo \
+			  overlay_20.dtbo \
+			  overlay_gpio_01.dtbo \
+			  overlay_gpio_02a.dtbo \
+			  overlay_gpio_02b.dtbo \
+			  overlay_gpio_03.dtbo \
+			  overlay_gpio_04a.dtbo \
+			  overlay_gpio_04b.dtbo
+
+apply_static_overlay_2 := overlay.dtbo
+
+DTC_FLAGS_static_base_1 += -Wno-interrupts_property \
+	-Wno-node_name_vs_property_name \
+	-Wno-interrupt_map
+
+static_test_1-dtbs := static_base_1.dtb $(apply_static_overlay_1)
+static_test_2-dtbs := static_base_2.dtb $(apply_static_overlay_2)
+
+dtb-$(CONFIG_OF_OVERLAY) += static_test_1.dtb static_test_2.dtb
diff --git a/drivers/of/unittest-data/overlay.dtso b/drivers/of/unittest-data/overlay.dtso
new file mode 100644
index 000000000..b3e807b99
--- /dev/null
+++ b/drivers/of/unittest-data/overlay.dtso
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&electric_1 {
+	status = "okay";
+
+	hvac_2: hvac-large-1 {
+		compatible = "ot,hvac-large";
+		heat-range = <40 75>;
+		cool-range = <65 80>;
+	};
+};
+
+&rides_1 {
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+	status = "okay";
+
+	ride@100 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		track@30 {
+			incline-up = <48 32 16>;
+		};
+
+		track@40 {
+			incline-up = <47 31 15>;
+		};
+	};
+
+	ride_200: ride@200 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "ot,ferris-wheel";
+		reg = <0x00000200 0x100>;
+		hvac-provider = <&hvac_2>;
+		hvac-thermostat = <27 32> ;
+		hvac-zones = <12 5>;
+		hvac-zone-names = "operator", "snack-bar";
+		spin-controller = <&spin_ctrl_1 3>;
+		spin-rph = <30>;
+		gondolas = <16>;
+		gondola-capacity = <6>;
+
+		ride_200_left: track@10 {
+			reg = <0x00000010 0x10>;
+		};
+
+		ride_200_right: track@20 {
+			reg = <0x00000020 0x10>;
+		};
+	};
+};
+
+&lights_2 {
+	status = "okay";
+	color = "purple", "white", "red", "green";
+	rate = <3 256>;
+};
diff --git a/drivers/of/unittest-data/overlay_0.dtso b/drivers/of/unittest-data/overlay_0.dtso
new file mode 100644
index 000000000..bb46582e0
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_0.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_0 - enable using absolute target path */
+
+&{/testcase-data/overlay-node/test-bus/test-unittest0} {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_1.dtso b/drivers/of/unittest-data/overlay_1.dtso
new file mode 100644
index 000000000..9c0fc8ffa
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_1.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_1 - disable using absolute target path */
+
+&{/testcase-data/overlay-node/test-bus/test-unittest1} {
+	status = "disabled";
+};
diff --git a/drivers/of/unittest-data/overlay_10.dtso b/drivers/of/unittest-data/overlay_10.dtso
new file mode 100644
index 000000000..73993bf23
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_10.dtso
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_10 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest10 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <10>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		test-unittest101 {
+			compatible = "unittest";
+			status = "okay";
+			reg = <1>;
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_11.dtso b/drivers/of/unittest-data/overlay_11.dtso
new file mode 100644
index 000000000..7d04ff503
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_11.dtso
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_11 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest11 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <11>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		test-unittest111 {
+			compatible = "unittest";
+			status = "okay";
+			reg = <1>;
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_12.dtso b/drivers/of/unittest-data/overlay_12.dtso
new file mode 100644
index 000000000..8d5087793
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_12.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_12 - enable using absolute target path (i2c) */
+
+&{/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12} {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_13.dtso b/drivers/of/unittest-data/overlay_13.dtso
new file mode 100644
index 000000000..da200ae94
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_13.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_13 - disable using absolute target path (i2c) */
+
+&{/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13} {
+	status = "disabled";
+};
diff --git a/drivers/of/unittest-data/overlay_15.dtso b/drivers/of/unittest-data/overlay_15.dtso
new file mode 100644
index 000000000..ba02ae1fe
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_15.dtso
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_15 - mux overlay */
+
+&unittest_i2c_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest15 {
+		reg = <11>;
+		compatible = "unittest-i2c-mux";
+		status = "okay";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+
+			test-mux-dev@20 {
+				reg = <0x20>;
+				compatible = "unittest-i2c-dev";
+				status = "okay";
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_16.dtso b/drivers/of/unittest-data/overlay_16.dtso
new file mode 100644
index 000000000..80a46dc02
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_16.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_16 - notify test */
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest16 {
+		compatible = "unittest";
+		reg = <16>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_17.dtso b/drivers/of/unittest-data/overlay_17.dtso
new file mode 100644
index 000000000..5b8a22091
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_17.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_17 - notify test */
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest17 {
+		compatible = "unittest";
+		reg = <17>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_18.dtso b/drivers/of/unittest-data/overlay_18.dtso
new file mode 100644
index 000000000..dcddd5f6d
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_18.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_18 - notify test */
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest18 {
+		compatible = "unittest";
+		reg = <18>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_19.dtso b/drivers/of/unittest-data/overlay_19.dtso
new file mode 100644
index 000000000..32b3ba0b6
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_19.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_19 - notify test */
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest19 {
+		compatible = "unittest";
+		reg = <19>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_2.dtso b/drivers/of/unittest-data/overlay_2.dtso
new file mode 100644
index 000000000..db8684ba8
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_2.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_2 -  enable using label */
+
+&unittest2 {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_20.dtso b/drivers/of/unittest-data/overlay_20.dtso
new file mode 100644
index 000000000..d4a4f2f32
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_20.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_20 - notify test */
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest20 {
+		compatible = "unittest";
+		reg = <20>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_3.dtso b/drivers/of/unittest-data/overlay_3.dtso
new file mode 100644
index 000000000..40f289e7c
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_3.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_3 - disable using label */
+
+&unittest3 {
+	status = "disabled";
+};
diff --git a/drivers/of/unittest-data/overlay_4.dtso b/drivers/of/unittest-data/overlay_4.dtso
new file mode 100644
index 000000000..9b9eadddb
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_4.dtso
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_4 - test insertion of a full node */
+
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest4 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <4>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_5.dtso b/drivers/of/unittest-data/overlay_5.dtso
new file mode 100644
index 000000000..706f5f1b7
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_5.dtso
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_5 - test overlay apply revert */
+
+&unittest5 {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_6.dtso b/drivers/of/unittest-data/overlay_6.dtso
new file mode 100644
index 000000000..21a7fa4ca
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_6.dtso
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_6 */
+/* overlays 6, 7 application and removal in sequence */
+
+&unittest6 {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_7.dtso b/drivers/of/unittest-data/overlay_7.dtso
new file mode 100644
index 000000000..58ba1bb51
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_7.dtso
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_7 */
+/* overlays 6, 7 application and removal in sequence */
+
+&unittest7 {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_8.dtso b/drivers/of/unittest-data/overlay_8.dtso
new file mode 100644
index 000000000..e9718d118
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_8.dtso
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_8 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest8 {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_9.dtso b/drivers/of/unittest-data/overlay_9.dtso
new file mode 100644
index 000000000..b35e23eda
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_9.dtso
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_9 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest8 {
+	property-foo = "bar";
+};
diff --git a/drivers/of/unittest-data/overlay_bad_add_dup_node.dtso b/drivers/of/unittest-data/overlay_bad_add_dup_node.dtso
new file mode 100644
index 000000000..9b53412b2
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_bad_add_dup_node.dtso
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/*
+ * &electric_1/motor-1 and &spin_ctrl_1 are the same node:
+ *   /testcase-data-2/substation@100/motor-1
+ *
+ * Thus the new node "controller" in each fragment will
+ * result in an attempt to add the same node twice.
+ * This will result in an error and the overlay apply
+ * will fail.
+ */
+
+&electric_1 {
+	motor-1 {
+		controller {
+			power_bus = <0x1 0x2>;
+		};
+	};
+};
+
+&spin_ctrl_1 {
+	controller {
+		power_bus_emergency = <0x101 0x102>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_bad_add_dup_prop.dtso b/drivers/of/unittest-data/overlay_bad_add_dup_prop.dtso
new file mode 100644
index 000000000..e03f79165
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_bad_add_dup_prop.dtso
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/*
+ * &electric_1/motor-1/electric and &spin_ctrl_1/electric are the same node:
+ *   /testcase-data-2/substation@100/motor-1/electric
+ *
+ * Thus the property "rpm_avail" in each fragment will
+ * result in an attempt to update the same property twice.
+ * This will result in an error and the overlay apply
+ * will fail.
+ *
+ * The previous version of this test did not include the extra
+ * level of node 'electric'.  That resulted in the 'rpm_avail'
+ * property being located in the pre-existing node 'motor-1'.
+ * Modifying a property results in a WARNING that a memory leak
+ * will occur if the overlay is removed.  Since the overlay apply
+ * fails, the memory leak does actually occur, and kmemleak will
+ * further report the memory leak if CONFIG_DEBUG_KMEMLEAK is
+ * enabled.  Adding the overlay node 'electric' avoids the
+ * memory leak and thus people who use kmemleak will not
+ * have to debug this non-problem again.
+ */
+
+&electric_1 {
+	motor-1 {
+		electric {
+			rpm_avail = <100>;
+		};
+	};
+};
+
+&spin_ctrl_1 {
+	electric {
+		rpm_avail = <100 200>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_bad_phandle.dtso b/drivers/of/unittest-data/overlay_bad_phandle.dtso
new file mode 100644
index 000000000..a61ffc073
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_bad_phandle.dtso
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&electric_1 {
+	// This label should cause an error when the overlay
+	// is applied.  There is already a phandle value
+	// in the base tree for motor-1.
+	spin_ctrl_1_conflict: motor-1 {
+		accelerate = <3>;
+		decelerate = <5>;
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_bad_symbol.dtso b/drivers/of/unittest-data/overlay_bad_symbol.dtso
new file mode 100644
index 000000000..07f730384
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_bad_symbol.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&electric_1 {
+	// This label should cause an error when the overlay
+	// is applied.  There is already a symbol hvac_1
+	// in the base tree
+	hvac_1: hvac-medium-2 {
+		compatible = "ot,hvac-medium";
+		heat-range = <50 75>;
+		cool-range = <60 80>;
+	};
+
+};
diff --git a/drivers/of/unittest-data/overlay_bad_unresolved.dtso b/drivers/of/unittest-data/overlay_bad_unresolved.dtso
new file mode 100644
index 000000000..f34d8780d
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_bad_unresolved.dtso
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&this_label_does_not_exist {
+	status = "okay";
+};
diff --git a/drivers/of/unittest-data/overlay_base.dtso b/drivers/of/unittest-data/overlay_base.dtso
new file mode 100644
index 000000000..ab9014589
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_base.dtso
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+#include "overlay_common.dtsi"
diff --git a/drivers/of/unittest-data/overlay_common.dtsi b/drivers/of/unittest-data/overlay_common.dtsi
new file mode 100644
index 000000000..a9d7cdbd5
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_common.dtsi
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Base device tree that overlays will be applied against.
+ *
+ * Do not add any properties in node "/".
+ * Do not add any nodes other than "/testcase-data-2" in node "/".
+ * Do not add anything that would result in dtc creating node "/__fixups__".
+ * dtc will create nodes "/__symbols__" and "/__local_fixups__".
+ */
+
+/ {
+	testcase-data-2 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		electric_1: substation@100 {
+			compatible = "ot,big-volts-control";
+			reg = <0x00000100 0x100>;
+			status = "disabled";
+
+			hvac_1: hvac-medium-1 {
+				compatible = "ot,hvac-medium";
+				heat-range = <50 75>;
+				cool-range = <60 80>;
+			};
+
+			spin_ctrl_1: motor-1 {
+				compatible = "ot,ferris-wheel-motor";
+				spin = "clockwise";
+				rpm_avail = <50>;
+			};
+
+			spin_ctrl_2: motor-8 {
+				compatible = "ot,roller-coaster-motor";
+			};
+		};
+
+		rides_1: fairway-1 {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			compatible = "ot,rides";
+			status = "disabled";
+			orientation = <127>;
+
+			ride@100 {
+				#address-cells = <1>;
+				#size-cells = <1>;
+				compatible = "ot,roller-coaster";
+				reg = <0x00000100 0x100>;
+				hvac-provider = <&hvac_1>;
+				hvac-thermostat = <29> ;
+				hvac-zones = <14>;
+				hvac-zone-names = "operator";
+				spin-controller = <&spin_ctrl_2 5 &spin_ctrl_2 7>;
+				spin-controller-names = "track_1", "track_2";
+				queues = <2>;
+
+				track@30 {
+					reg = <0x00000030 0x10>;
+				};
+
+				track@40 {
+					reg = <0x00000040 0x10>;
+				};
+
+			};
+		};
+
+		lights_1: lights@30000 {
+			compatible = "ot,work-lights";
+			reg = <0x00030000 0x1000>;
+			status = "disabled";
+		};
+
+		lights_2: lights@40000 {
+			compatible = "ot,show-lights";
+			reg = <0x00040000 0x1000>;
+			status = "disabled";
+			rate = <13 138>;
+		};
+
+		retail_1: vending@50000 {
+			reg = <0x00050000 0x1000>;
+			compatible = "ot,tickets";
+			status = "disabled";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_01.dtso b/drivers/of/unittest-data/overlay_gpio_01.dtso
new file mode 100644
index 000000000..bb3a31a21
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_01.dtso
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	gpio@0 {
+		compatible = "unittest-gpio";
+		reg = <0>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B";
+
+		line-b {
+			gpio-hog;
+			gpios = <2 0>;
+			input;
+			line-name = "line-B-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_02a.dtso b/drivers/of/unittest-data/overlay_gpio_02a.dtso
new file mode 100644
index 000000000..da955537d
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_02a.dtso
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	gpio@2 {
+		compatible = "unittest-gpio";
+		reg = <2>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B";
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_02b.dtso b/drivers/of/unittest-data/overlay_gpio_02b.dtso
new file mode 100644
index 000000000..79503965d
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_02b.dtso
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	gpio@2 {
+		line-a {
+			gpio-hog;
+			gpios = <1 0>;
+			input;
+			line-name = "line-A-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_03.dtso b/drivers/of/unittest-data/overlay_gpio_03.dtso
new file mode 100644
index 000000000..d8c709616
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_03.dtso
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	gpio@3 {
+		compatible = "unittest-gpio";
+		reg = <3>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B", "line-C", "line-D";
+
+		line-d {
+			gpio-hog;
+			gpios = <4 0>;
+			input;
+			line-name = "line-D-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_04a.dtso b/drivers/of/unittest-data/overlay_gpio_04a.dtso
new file mode 100644
index 000000000..de8651197
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_04a.dtso
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	gpio@4 {
+		compatible = "unittest-gpio";
+		reg = <4>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B", "line-C", "line-D";
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_04b.dtso b/drivers/of/unittest-data/overlay_gpio_04b.dtso
new file mode 100644
index 000000000..dc6eff22f
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_04b.dtso
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	gpio@4 {
+		line-c {
+			gpio-hog;
+			gpios = <3 0>;
+			input;
+			line-name = "line-C-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_pci_node.dtso b/drivers/of/unittest-data/overlay_pci_node.dtso
new file mode 100644
index 000000000..c05e52e9e
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_pci_node.dtso
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/ {
+	fragment@0 {
+		target-path="";
+		__overlay__ {
+			#address-cells = <3>;
+			#size-cells = <2>;
+			pci-ep-bus@0 {
+				compatible = "simple-bus";
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges = <0x0 0x0 0x0 0x0 0x1000>;
+				reg = <0 0 0 0 0>;
+				unittest-pci@100 {
+					compatible = "unittest-pci";
+					reg = <0x100 0x200>;
+				};
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/static_base_1.dts b/drivers/of/unittest-data/static_base_1.dts
new file mode 100644
index 000000000..10556cb3f
--- /dev/null
+++ b/drivers/of/unittest-data/static_base_1.dts
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "testcases_common.dtsi"
diff --git a/drivers/of/unittest-data/static_base_2.dts b/drivers/of/unittest-data/static_base_2.dts
new file mode 100644
index 000000000..b0ea9504d
--- /dev/null
+++ b/drivers/of/unittest-data/static_base_2.dts
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "overlay_common.dtsi"
diff --git a/drivers/of/unittest-data/testcases.dtso b/drivers/of/unittest-data/testcases.dtso
new file mode 100644
index 000000000..61cdd3d5f
--- /dev/null
+++ b/drivers/of/unittest-data/testcases.dtso
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+#include "testcases_common.dtsi"
+
+/ {
+	/*
+	 * testcase data that intentionally results in an error is located here
+	 * instead of in testcases_common.dtsi so that the static overlay apply
+	 * tests will not include the error.
+	 */
+	testcase-data {
+		testcase-device2 {
+			compatible = "testcase-device";
+			interrupt-parent = <&test_intc2>;
+			interrupts = <1>; /* invalid specifier - too short */
+		};
+	};
+
+};
diff --git a/drivers/of/unittest-data/testcases_common.dtsi b/drivers/of/unittest-data/testcases_common.dtsi
new file mode 100644
index 000000000..1c2cdf353
--- /dev/null
+++ b/drivers/of/unittest-data/testcases_common.dtsi
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		changeset {
+			prop-update = "hello";
+			prop-remove = "world";
+
+			node-remove {
+			};
+		};
+	};
+};
+
+#include "tests-phandle.dtsi"
+#include "tests-interrupts.dtsi"
+#include "tests-match.dtsi"
+#include "tests-address.dtsi"
+#include "tests-platform.dtsi"
+#include "tests-overlay.dtsi"
+#include "tests-lifecycle.dtsi"
diff --git a/drivers/of/unittest-data/tests-address.dtsi b/drivers/of/unittest-data/tests-address.dtsi
new file mode 100644
index 000000000..f02a181bb
--- /dev/null
+++ b/drivers/of/unittest-data/tests-address.dtsi
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	testcase-data {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		address-tests {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			/* ranges here is to make sure we don't use it for
+			 * dma-ranges translation */
+			ranges = <0x70000000 0x70000000 0x50000000>,
+				 <0x00000000 0xd0000000 0x20000000>;
+			dma-ranges = <0x0 0x20000000 0x40000000>;
+
+			device@70000000 {
+				reg = <0x70000000 0x1000>;
+			};
+
+			bus@80000000 {
+				#address-cells = <2>;
+				#size-cells = <2>;
+				ranges = <0x0 0x0 0x80000000 0x0 0x100000>;
+				dma-ranges = <0x1 0x0 0x0 0x20 0x0>;
+
+				device@1000 {
+					reg = <0x0 0x1000 0x0 0x1000>;
+				};
+			};
+
+			pci@90000000 {
+				device_type = "pci";
+				#address-cells = <3>;
+				#size-cells = <2>;
+				reg = <0x90000000 0x1000>;
+				ranges = <0x42000000 0x0 0x40000000 0x40000000 0x0 0x10000000>;
+				dma-ranges = <0x42000000 0x0 0x80000000 0x00000000 0x0 0x10000000>,
+					     <0x42000000 0x0 0xc0000000 0x20000000 0x0 0x10000000>;
+			};
+
+			bus@a0000000 {
+				#address-cells = <3>;
+				#size-cells = <2>;
+				ranges = <0xf00baa 0x0 0x0 0xa0000000 0x0 0x100000>,
+					 <0xf00bee 0x1 0x0 0xb0000000 0x0 0x200000>;
+			};
+
+		};
+
+		address-tests2 {
+			#address-cells = <2>;
+			#size-cells = <1>;
+
+			ranges = <0x10000000 0x01000000 0xa0000000 0x01000000>,
+				 <0x10000000 0x02000000 0xb0000000 0x01000000>,
+				 <0x20000000 0x01000000 0xc0000000 0x01000000>,
+				 <0x20000000 0x02000000 0xd0000000 0x01000000>,
+				 <0x00000000 0xd1000000 0xd1000000 0x01000000>,
+				 <0x00000000 0xe8000000 0xe8000000 0x07f00000>,
+				 <0x00000000 0xefff0000 0xefff0000 0x00010000>;
+
+			bus-2cell@10000000 {
+				#address-cells = <2>;
+				#size-cells = <1>;
+				ranges = <0x100000 0x10000 0x10000000 0x1a00000 0x10000>,
+					 <0x100000 0x20000 0x10000000 0x1b00000 0x10000>,
+					 <0x200000 0x10000 0x20000000 0x1c00000 0x10000>,
+					 <0x200000 0x20000 0x20000000 0x2d00000 0x10000>;
+
+				device@100000 {
+					reg = <0x100000 0x11000 0x100>,
+					      <0x100000 0x12000 0x100>,
+					      <0x200000 0x11000 0x100>,
+					      <0x200000 0x21000 0x100>;
+				};
+			};
+
+			bus-3cell@20000000 {
+				#address-cells = <3>;
+				#size-cells = <1>;
+				ranges = <0x1 0x100000 0x10000 0x10000000 0x1a00000 0x10000>,
+					 <0x2 0x100000 0x10000 0x10000000 0x1b00000 0x10000>,
+					 <0x3 0x200000 0x10000 0x20000000 0x1c00000 0x10000>,
+					 <0x4 0x200000 0x20000 0x20000000 0x2d00000 0x10000>;
+
+				local-bus@100000 {
+					#address-cells = <1>;
+					#size-cells = <1>;
+					ranges = <0xf1000000 0x1 0x100000 0x10000 0x10000>,
+						 <0xf2000000 0x2 0x100000 0x10000 0x10000>,
+						 <0xf3000000 0x3 0x200000 0x10000 0x08000>,
+						 <0xf3800000 0x3 0x200000 0x18000 0x08000>,
+						 <0xf4000000 0x4 0x200000 0x20000 0x10000>;
+
+					device@f1001000 {
+						reg = <0xf1001000 0x100>,
+						      <0xf2002000 0x100>,
+						      <0xf3001000 0x100>,
+						      <0xf3801000 0x100>,
+						      <0xf4001000 0x100>;
+					};
+				};
+			};
+
+			pcie@d1070000 {
+				#address-cells = <0x03>;
+				#size-cells = <0x02>;
+				bus-range = <0x00 0xff>;
+				device_type = "pci";
+				ranges = <0x82000000 0 0xe8000000 0 0xe8000000 0 0x7f00000>,
+					 <0x81000000 0 0x00000000 0 0xefff0000 0 0x0010000>;
+				dma-ranges = <0x43000000 0x10 0x00 0x00 0x00 0x00 0x10000000>;
+				reg = <0x00000000 0xd1070000 0x20000>;
+
+				pci@0,0 {
+					#address-cells = <0x03>;
+					#size-cells = <0x02>;
+					bus-range = <0x01 0x01>;
+					device_type = "pci";
+					ranges = <0x82000000 0 0xe8000000
+						  0x82000000 0 0xe8000000
+						  0 0x4400000>;
+					reg = <0x00 0x00 0x00 0x00 0x00>;
+
+					dev@0,0 {
+						#address-cells = <0x03>;
+						#size-cells = <0x02>;
+						ranges = <0 0 0 0x82010000 0 0xe8000000 0 0x2000000>,
+							 <1 0 0 0x82010000 0 0xea000000 0 0x1000000>,
+							 <2 0 0 0x82010000 0 0xeb000000 0 0x0800000>,
+							 <3 0 0 0x82010000 0 0xeb800000 0 0x0800000>,
+							 <4 0 0 0x82010000 0 0xec000000 0 0x0020000>,
+							 <5 0 0 0x82010000 0 0xec020000 0 0x0002000>;
+						reg = <0x10000 0x00 0x00 0x00 0x00>;
+
+						local-bus@0 {
+							#address-cells = <0x01>;
+							#size-cells = <0x01>;
+							ranges = <0xa0000000 0 0 0 0x2000000>,
+								 <0xb0000000 1 0 0 0x1000000>;
+							dma-ranges = <0xc0000000 0x43000000 0x10 0x00 0x10000000>;
+
+							dev@e0000000 {
+								reg = <0xa0001000 0x1000>,
+								      <0xb0002000 0x2000>;
+							};
+						};
+					};
+				};
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/tests-interrupts.dtsi b/drivers/of/unittest-data/tests-interrupts.dtsi
new file mode 100644
index 000000000..974f888c9
--- /dev/null
+++ b/drivers/of/unittest-data/tests-interrupts.dtsi
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		interrupts {
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			test_intc0: intc0 {
+				interrupt-controller;
+				#interrupt-cells = <1>;
+			};
+
+			test_intc1: intc1 {
+				interrupt-controller;
+				#interrupt-cells = <3>;
+			};
+
+			test_intc2: intc2 {
+				interrupt-controller;
+				#interrupt-cells = <2>;
+			};
+
+			test_intmap0: intmap0 {
+				#interrupt-cells = <1>;
+				#address-cells = <0>;
+				interrupt-map = <1 &test_intc0 9>,
+						<2 &test_intc1 10 11 12>,
+						<3 &test_intc2 13 14>,
+						<4 &test_intc2 15 16>;
+			};
+
+			test_intmap1: intmap1 {
+				#interrupt-cells = <2>;
+				/*
+				 * #address-cells is required
+				 *
+				 * The property is not provided in this node to
+				 * test that the code will properly handle
+				 * this case for legacy .dts files.
+				 *
+				 * Not having #address-cells will result in a
+				 * warning from dtc starting with
+				 * version v1.6.1-19-g0a3a9d3449c8
+				 * The warning is suppressed by adding
+				 * -Wno-interrupt_map to the Makefile for all
+				 * .dts files this include this .dtsi
+				#address-cells = <1>;
+				 */
+				interrupt-map = <0x5000 1 2 &test_intc0 15>;
+			};
+
+			intmap2 {
+				#interrupt-cells = <2>;
+				#address-cells = <0>;
+				interrupt-map = <1 11 &test_intc0 100>,
+						<2 22 &test_intc1 200 201 202>,
+						<3 33 &test_intc2 300 301>,
+						<4 44 &test_intc2 400 401>;
+			};
+
+			test_intc_intmap0: intc-intmap0 {
+				#interrupt-cells = <1>;
+				#address-cells = <1>;
+				interrupt-controller;
+				interrupt-map = <0x6000 1 &test_intc_intmap0 0x7000 2>;
+			};
+
+			interrupts0 {
+				interrupt-parent = <&test_intc0>;
+				interrupts = <1>, <2>, <3>, <4>;
+			};
+
+			interrupts1 {
+				interrupt-parent = <&test_intmap0>;
+				interrupts = <1>, <2>, <3>, <4>;
+			};
+
+			interrupts2 {
+				reg = <0x6000 0x100>;
+				interrupt-parent = <&test_intc_intmap0>;
+				interrupts = <1>;
+			};
+
+			interrupts-extended0 {
+				reg = <0x5000 0x100>;
+				/*
+				 * Do not remove &test_intmap1 from this
+				 * property - see comment in node intmap1
+				 */
+				interrupts-extended = <&test_intc0 1>,
+						      <&test_intc1 2 3 4>,
+						      <&test_intc2 5 6>,
+						      <&test_intmap0 1>,
+						      <&test_intmap0 2>,
+						      <&test_intmap0 3>,
+						      <&test_intmap1 1 2>;
+			};
+		};
+
+		testcase-device1 {
+			compatible = "testcase-device";
+			interrupt-parent = <&test_intc0>;
+			interrupts = <1>;
+		};
+
+		/*
+		 * testcase data that intentionally results in an error is
+		 * located in testcases.dts instead of in this file so that the
+		 * static overlay apply tests will not include the error.
+		 */
+	};
+};
diff --git a/drivers/of/unittest-data/tests-lifecycle.dtsi b/drivers/of/unittest-data/tests-lifecycle.dtsi
new file mode 100644
index 000000000..28509a878
--- /dev/null
+++ b/drivers/of/unittest-data/tests-lifecycle.dtsi
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		refcount-node {
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/tests-match.dtsi b/drivers/of/unittest-data/tests-match.dtsi
new file mode 100644
index 000000000..1fd3b2131
--- /dev/null
+++ b/drivers/of/unittest-data/tests-match.dtsi
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		match-node {
+			name0 { };
+			name1 { device_type = "type1"; };
+			a { name2 { device_type = "type1"; }; };
+			b { name2 { }; };
+			c { name2 { device_type = "type2"; }; };
+			name3 { compatible = "compat3"; };
+			name4 { compatible = "compat2", "compat3"; };
+			name5 { compatible = "compat2", "compat3"; };
+			name6 { compatible = "compat1", "compat2", "compat3"; };
+			name7 { compatible = "compat2"; device_type = "type1"; };
+			name8 { compatible = "compat2"; device_type = "type1"; };
+			name9 { compatible = "compat2"; };
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/tests-overlay.dtsi b/drivers/of/unittest-data/tests-overlay.dtsi
new file mode 100644
index 000000000..eb35e8aa5
--- /dev/null
+++ b/drivers/of/unittest-data/tests-overlay.dtsi
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		overlay-node {
+			/* test bus */
+			unittest_test_bus: test-bus {
+				compatible = "simple-bus";
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				unittest100: test-unittest100 {
+					compatible = "unittest";
+					status = "okay";
+					reg = <100>;
+				};
+
+				unittest101: test-unittest101 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <101>;
+				};
+
+				unittest0: test-unittest0 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <0>;
+				};
+
+				unittest1: test-unittest1 {
+					compatible = "unittest";
+					status = "okay";
+					reg = <1>;
+				};
+
+				unittest2: test-unittest2 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <2>;
+				};
+
+				unittest3: test-unittest3 {
+					compatible = "unittest";
+					status = "okay";
+					reg = <3>;
+				};
+
+				unittest5: test-unittest5 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <5>;
+				};
+
+				unittest6: test-unittest6 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <6>;
+				};
+
+				unittest7: test-unittest7 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <7>;
+				};
+
+				unittest8: test-unittest8 {
+					compatible = "unittest";
+					status = "disabled";
+					reg = <8>;
+				};
+
+				unittest_i2c_test_bus: i2c-test-bus {
+					compatible = "unittest-i2c-bus";
+					status = "okay";
+					reg = <50>;
+
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					test-unittest12 {
+						reg = <8>;
+						compatible = "unittest-i2c-dev";
+						status = "disabled";
+					};
+
+					test-unittest13 {
+						reg = <9>;
+						compatible = "unittest-i2c-dev";
+						status = "okay";
+					};
+
+					test-unittest14 {
+						reg = <10>;
+						compatible = "unittest-i2c-mux";
+						status = "okay";
+
+						#address-cells = <1>;
+						#size-cells = <0>;
+
+						i2c@0 {
+							#address-cells = <1>;
+							#size-cells = <0>;
+							reg = <0>;
+
+							test-mux-dev@20 {
+								reg = <0x20>;
+								compatible = "unittest-i2c-dev";
+								status = "okay";
+							};
+						};
+					};
+				};
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/tests-phandle.dtsi b/drivers/of/unittest-data/tests-phandle.dtsi
new file mode 100644
index 000000000..554a996b2
--- /dev/null
+++ b/drivers/of/unittest-data/tests-phandle.dtsi
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	aliases {
+		testcase-alias = &testcase;
+	};
+
+	testcase: testcase-data {
+		security-password = "password";
+		duplicate-name = "duplicate";
+
+		duplicate-name { };
+
+		phandle-tests {
+			provider0: provider0 {
+				#phandle-cells = <0>;
+			};
+
+			provider1: provider1 {
+				#phandle-cells = <1>;
+			};
+
+			provider2: provider2 {
+				#phandle-cells = <2>;
+			};
+
+			provider3: provider3 {
+				#phandle-cells = <3>;
+			};
+
+			provider4: provider4 {
+				#phandle-cells = <2>;
+				phandle-map = <0 1 &provider1 3>,
+					      <4 0 &provider0>,
+					      <16 5 &provider3 3 5 0>,
+					      <200 8 &provider2 23 6>,
+					      <19 0 &provider2 15 0>,
+					      <2 3 &provider3 2 5 3>;
+				phandle-map-mask = <0xff 0xf>;
+				phandle-map-pass-thru = <0x0 0xf0>;
+			};
+
+			provider5: provider5 {
+				#phandle-cells = <2>;
+				phandle-map = <2 7 &provider4 2 3>;
+				phandle-map-mask = <0xff 0xf>;
+				phandle-map-pass-thru = <0x0 0xf0>;
+			};
+
+			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>;
+				empty-property;
+				string-property = "foobar";
+				unterminated-string = [40 41 42 43];
+				unterminated-string-list = "first", "second", [40 41 42 43];
+			};
+
+			consumer-b {
+				phandle-list =	<&provider1 1>,
+						<&provider4 2 3>,
+						<0>,
+						<&provider4 4 0x100>,
+						<&provider4 0 0x61>,
+						<&provider0>,
+						<&provider4 19 0x20>,
+						<&provider5 2 7>;
+				phandle-list-bad-phandle = <12345678 0 0>;
+				phandle-list-bad-args = <&provider2 1 0>,
+							<&provider4 0>;
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/tests-platform.dtsi b/drivers/of/unittest-data/tests-platform.dtsi
new file mode 100644
index 000000000..59aa2a973
--- /dev/null
+++ b/drivers/of/unittest-data/tests-platform.dtsi
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		platform-tests {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			test-device@0 {
+				compatible = "test-device";
+				reg = <0x0>;
+
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				dev@100 {
+					compatible = "test-sub-device";
+					reg = <0x100>;
+				};
+			};
+
+			test-device@1 {
+				compatible = "test-device";
+				reg = <0x1>;
+
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				dev@100 {
+					compatible = "test-sub-device",
+						     "test-compat2",
+						     "test-compat3";
+					reg = <0x100>;
+				};
+			};
+
+			test-device@2 {
+				compatible = "test,rust-device";
+				reg = <0x2>;
+
+				test,u32-prop = <0xdeadbeef>;
+				test,i16-array = /bits/ 16 <1 2 (-3) (-4)>;
+
+				ref_child_0: child-0 {
+					test,ref-arg = <&ref_child_1 0x20 0x32>;
+				};
+				ref_child_1: child-1 {
+					test,ref-arg = <&ref_child_0 0x10 0x64>;
+				};
+			};
+		};
+
+		platform-tests-2 {
+			// No #address-cells or #size-cells
+			node {
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				test-device@100 {
+					compatible = "test-sub-device";
+					reg = <0x100 1>;
+				};
+			};
+		};
+	};
+};