samples: subsys: nvs: add testcase for MCXN947 internal flash

For boards frdm_mcxn947 and mcx_n9xx_evk test NVS in internal flash in
addition to external QSPI flash.  Also enable the NVS subsystem on
these boards for Twister.

Signed-off-by: Derek Snell <[email protected]>

Author: DerekSnell

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.yaml

@@ -24,6 +24,7 @@ supported:
   - i2c
   - i2s
   - i3c
+  - nvs
   - pwm
   - regulator
   - rtc

boards/nxp/mcx_n9xx_evk/mcx_n9xx_evk_mcxn947_cpu0.yaml

@@ -24,6 +24,7 @@ supported:
   - i2c
   - i2s
   - i3c
+  - nvs
   - pwm
   - regulator
   - rtc

samples/subsys/nvs/nxp/mcxn947_internal_flash.overlay

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* The MCXN947 boards place the storage_partition in external flash.  For this
+ * testcase, move the storage_partition to internal flash
+ */
+
+/delete-node/ &storage_partition;
+
+&flash {
+	partitions {
+		storage_partition: partition@100000 {
+			label = "storage";
+			reg = <0x100000 DT_SIZE_M(1)>;
+		};
+	};
+};

samples/subsys/nvs/sample.yaml

@@ -21,3 +21,27 @@ tests:
            39 3a 3b 3c 3d 3e 3f 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f 50 51 52 53 54 55 \
            56 57 58 59 5a 5b 5c 5d 5e 5f 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f 70 71 72 \
            73 74 75 76 77 78 79 7a 7b 7c 7d 7e 7f"
+  sample.nvs.internal_flash:
+    tags: nvs
+    depends_on: nvs
+    integration_platforms:
+      - frdm_mcxn947/mcxn947/cpu0
+    platform_allow:
+      - frdm_mcxn947/mcxn947/cpu0
+      - mcx_n9xx_evk/mcxn947/cpu0
+    extra_args:
+      - platform:frdm_mcxn947/mcxn947/cpu0:"DTC_OVERLAY_FILE=nxp/mcxn947_internal_flash.overlay"
+      - platform:mcx_n9xx_evk/mcxn947/cpu0:"DTC_OVERLAY_FILE=nxp/mcxn947_internal_flash.overlay"
+    harness: console
+    harness_config:
+      type: multi_line
+      regex:
+        - "Id: 1, Address: 192.168.1.1"
+        - "Id: 2, Key: ff fe fd fc fb fa f9 f8"
+        - "Id: 3, Reboot_counter: (.*)"
+        - "Id: 4, Data: DATA"
+        - "Id: 5, Longarray: 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13 14 15 16 17 18 19 1a 1b \
+           1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 34 35 36 37 38 \
+           39 3a 3b 3c 3d 3e 3f 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f 50 51 52 53 54 55 \
+           56 57 58 59 5a 5b 5c 5d 5e 5f 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f 70 71 72 \
+           73 74 75 76 77 78 79 7a 7b 7c 7d 7e 7f"