tests: devicetree: test LINKER_DT_NODE_REGION_NAME

Add a new application for testing non-core devicetree functionality.
Add tests for the default and fallback case of
`LINKER_DT_NODE_REGION_NAME`.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>

tests/lib/devicetree/api_ext/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(devicetree_extensions)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/lib/devicetree/api_ext/README

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+Test cases for the devicetree.h extensions (GPIO, SPI, etc).

tests/lib/devicetree/api_ext/app.overlay

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+/*
+ * Copyright (c) 2021, Commonwealth Scientific and Industrial Research
+ * Organisation (CSIRO) ABN 41 687 119 230.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Application overlay for testing the devicetree.h extension API's.
+ *
+ * Names in this file should be chosen in a way that won't conflict
+ * with real-world devicetree nodes, to allow these tests to run on
+ * (and be extended to test) real hardware.
+ */
+
+ / {
+	test {
+		#address-cells = < 0x1 >;
+		#size-cells = < 0x1 >;
+
+		test_sram1: sram@20000000 {
+			compatible = "mmio-sram";
+			reg = < 0x20000000 0x1000 >;
+			zephyr,memory-region = "SRAM_REGION";
+		};
+		test_sram2: sram@20001000 {
+			compatible = "mmio-sram";
+			reg = < 0x20001000 0x1000 >;
+		};
+	};
+};

tests/lib/devicetree/api_ext/prj.conf

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+CONFIG_ZTEST=y

tests/lib/devicetree/api_ext/src/main.c

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+/*
+ * Copyright (c) 2021, Commonwealth Scientific and Industrial Research
+ * Organisation (CSIRO) ABN 41 687 119 230.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ztest.h>
+#include <devicetree.h>
+#include <device.h>
+#include <drivers/gpio.h>
+
+#include <linker/devicetree_regions.h>
+
+#define TEST_SRAM1      DT_NODELABEL(test_sram1)
+#define TEST_SRAM2      DT_NODELABEL(test_sram2)
+
+static void test_linker_regions(void)
+{
+	zassert_true(!strcmp(LINKER_DT_NODE_REGION_NAME(TEST_SRAM1), "SRAM_REGION"), "");
+	zassert_true(!strcmp(LINKER_DT_NODE_REGION_NAME(TEST_SRAM2), "/test/sram@20001000"), "");
+}
+
+void test_main(void)
+{
+	ztest_test_suite(devicetree_api_ext,
+			 ztest_unit_test(test_linker_regions)
+			 );
+	ztest_run_test_suite(devicetree_api_ext);
+}

tests/lib/devicetree/api_ext/testcase.yaml

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+tests:
+  libraries.devicetree_ext:
+    tags: devicetree
+    # We only need this to run on one platform so use native_posix as it
+    # will mostly likely be the fastest.
+    integration_platforms:
+      - native_posix