of: overlay: test case of two fragments adding same node

Multiple overlay fragments adding or deleting the same node is not
supported.  An attempt to do so results in an incorrect devicetree.
The node name will be munged for the second add.

After adding this patch, the unittest messages will show:

   Duplicate name in motor-1, renamed to "controller#1"
   OF: overlay: of_overlay_apply() err=0
   ### dt-test ### of_overlay_fdt_apply() expected -22, ret=0, overlay_bad_add_dup_node
   ### dt-test ### FAIL of_unittest_overlay_high_level():2419 Adding overlay 'overlay_bad_add_dup_node' failed

   ...

   ### dt-test ### end of unittest - 210 passed, 1 failed

The incorrect (munged) node name "controller#1" can be seen in the
/proc filesystem:

   $ pwd
   /proc/device-tree/testcase-data-2/substation@100/motor-1
   $ ls
   compatible    controller    controller#1  name          phandle       spin
   $ ls controller
   power_bus
   $ ls controller#1
   power_bus_emergency
Tested-by: Alan Tull <atull@kernel.org>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>

drivers/of/unittest-data/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_OF_OVERLAY) += overlay.dtb.o \
 			    overlay_12.dtb.o \
 			    overlay_13.dtb.o \
 			    overlay_15.dtb.o \
+			    overlay_bad_add_dup_node.dtb.o \
 			    overlay_bad_phandle.dtb.o \
 			    overlay_bad_symbol.dtb.o \
 			    overlay_base.dtb.o

drivers/of/unittest-data/overlay_bad_add_dup_node.dts

+// 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 >;
+		};
+};

drivers/of/unittest.c

@@ -2161,6 +2161,7 @@ OVERLAY_INFO_EXTERN(overlay_11);
 OVERLAY_INFO_EXTERN(overlay_12);
 OVERLAY_INFO_EXTERN(overlay_13);
 OVERLAY_INFO_EXTERN(overlay_15);
+OVERLAY_INFO_EXTERN(overlay_bad_add_dup_node);
 OVERLAY_INFO_EXTERN(overlay_bad_phandle);
 OVERLAY_INFO_EXTERN(overlay_bad_symbol);
 
@@ -2183,6 +2184,7 @@ static struct overlay_info overlays[] = {
 	OVERLAY_INFO(overlay_12, 0),
 	OVERLAY_INFO(overlay_13, 0),
 	OVERLAY_INFO(overlay_15, 0),
+	OVERLAY_INFO(overlay_bad_add_dup_node, -EINVAL),
 	OVERLAY_INFO(overlay_bad_phandle, -EINVAL),
 	OVERLAY_INFO(overlay_bad_symbol, -EINVAL),
 	{}
@@ -2430,6 +2432,9 @@ static __init void of_unittest_overlay_high_level(void)
 	unittest(overlay_data_apply("overlay", NULL),
 		 "Adding overlay 'overlay' failed\n");
 
+	unittest(overlay_data_apply("overlay_bad_add_dup_node", NULL),
+		 "Adding overlay 'overlay_bad_add_dup_node' failed\n");
+
 	unittest(overlay_data_apply("overlay_bad_phandle", NULL),
 		 "Adding overlay 'overlay_bad_phandle' failed\n");