tests: lib: devicetree: Add hwspinlock dt spec test

Extends the devicetree library test to exercise the hwspinlock dt spec
macros and detect the context initializer build warning that was fixed
in commit 8b208b0d5a. Previously the build
warning wasn't reproducible in-tree.

Signed-off-by: Maureen Helm <maureen.helm@analog.com>

drivers/hwspinlock/CMakeLists.txt

@@ -3,3 +3,4 @@
 zephyr_library()
 
 zephyr_library_sources_ifdef(CONFIG_SQN_HWSPINLOCK sqn_hwspinlock.c)
+zephyr_library_sources_ifdef(CONFIG_HWSPINLOCK_TEST hwspinlock_test.c)

drivers/hwspinlock/Kconfig

@@ -22,6 +22,7 @@ config HWSPINLOCK_INIT_PRIORITY
 
 # zephyr-keep-sorted-start
 source "drivers/hwspinlock/Kconfig.sqn"
+source "drivers/hwspinlock/Kconfig.test"
 # zephyr-keep-sorted-stop
 
 endif

drivers/hwspinlock/Kconfig.test

@@ -0,0 +1,6 @@
+# Copyright (c) 2025 Analog Devices, Inc.
+# SPDX-License-Identifier: Apache-2.0
+#
+config HWSPINLOCK_TEST
+	def_bool DT_HAS_VND_HWSPINLOCK_ENABLED
+	depends on DT_HAS_VND_HWSPINLOCK_ENABLED

drivers/hwspinlock/hwspinlock_test.c

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 Analog Devices, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/hwspinlock.h>
+
+#define DT_DRV_COMPAT vnd_hwspinlock
+
+static void vnd_hwspinlock_lock(const struct device *dev, uint32_t id)
+{
+}
+
+static void vnd_hwspinlock_unlock(const struct device *dev, uint32_t id)
+{
+}
+
+static uint32_t vnd_hwspinlock_get_max_id(const struct device *dev)
+{
+	return 0;
+}
+
+static DEVICE_API(hwspinlock, vnd_hwspinlock_api) = {
+	.lock = vnd_hwspinlock_lock,
+	.unlock = vnd_hwspinlock_unlock,
+	.get_max_id = vnd_hwspinlock_get_max_id,
+};
+
+#define VND_HWSPINLOCK_INIT(idx)					\
+	DEVICE_DT_INST_DEFINE(idx, NULL, NULL, NULL, NULL, POST_KERNEL,	\
+			      CONFIG_HWSPINLOCK_INIT_PRIORITY,		\
+			      &vnd_hwspinlock_api)
+
+DT_INST_FOREACH_STATUS_OKAY(VND_HWSPINLOCK_INIT);

dts/bindings/test/vnd,hwspinlock-device.yaml

@@ -0,0 +1,12 @@
+# Copyright (c) 2025 Analog Devices, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Test hardware spinlock device node
+
+compatible: "vnd,hwspinlock-device"
+
+include: base.yaml
+
+properties:
+  hwlocks:
+    required: true

dts/bindings/test/vnd,hwspinlock.yaml

@@ -0,0 +1,11 @@
+# Copyright (c) 2025 Analog Devices, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Test hardware spinlock node
+
+compatible: "vnd,hwspinlock"
+
+include: [base.yaml, hwspinlock-controller.yaml]
+
+hwlock-cells:
+  - id

tests/lib/devicetree/api_ext/app.overlay

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Commonwealth Scientific and Industrial Research
  * Organisation (CSIRO) ABN 41 687 119 230.
+ * Copyright (c) 2025 Analog Devices, Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -75,5 +76,18 @@
 			mboxes = <&test_mbox 1>, <&test_mbox 2>, <&test_mbox_zero_cell>;
 			mbox-names = "tx", "rx", "zero";
 		};
+
+		test_hwspinlock: hwspinlock {
+			compatible = "vnd,hwspinlock";
+			#hwlock-cells = <1>;
+			status = "okay";
+		};
+
+		test_hwspinlock_dev: hwspinlock-dev {
+			compatible = "vnd,hwspinlock-device";
+			hwlocks = <&test_hwspinlock 1>, <&test_hwspinlock 2>;
+			hwlock-names = "rd", "wr";
+			status = "okay";
+		};
 	};
 };

tests/lib/devicetree/api_ext/prj.conf

@@ -1,3 +1,5 @@
 CONFIG_ZTEST=y
 CONFIG_ADC=y
 CONFIG_MBOX=y
+CONFIG_HWSPINLOCK=y
+CONFIG_SPIN_VALIDATE=n

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

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Commonwealth Scientific and Industrial Research
  * Organisation (CSIRO) ABN 41 687 119 230.
+ * Copyright (c) 2025 Analog Devices, Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -11,6 +12,7 @@
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/drivers/adc.h>
 #include <zephyr/drivers/mbox.h>
+#include <zephyr/drivers/hwspinlock.h>
 
 #include <zephyr/linker/devicetree_regions.h>
 
@@ -59,4 +61,37 @@ ZTEST(devicetree_api_ext, test_mbox_dt_spec)
 	zassert_equal(channel_zero.channel_id, 0, "");
 }
 
+#define TEST_HWSPINLOCK \
+	DT_NODELABEL(test_hwspinlock)
+
+#define TEST_HWSPINLOCK_DEV \
+	DT_NODELABEL(test_hwspinlock_dev)
+
+#define HWSPINLOCK_BY_IDX(node_id, prop, idx) \
+	HWSPINLOCK_DT_SPEC_GET_BY_IDX(node_id, idx)
+
+static const struct hwspinlock_dt_spec spec[] = {
+	DT_FOREACH_PROP_ELEM_SEP(TEST_HWSPINLOCK_DEV, hwlocks, HWSPINLOCK_BY_IDX, (,))
+};
+
+static const struct hwspinlock_dt_spec rd =
+	HWSPINLOCK_DT_SPEC_GET_BY_NAME(TEST_HWSPINLOCK_DEV, rd);
+
+static const struct hwspinlock_dt_spec wr =
+	HWSPINLOCK_DT_SPEC_GET_BY_NAME(TEST_HWSPINLOCK_DEV, wr);
+
+ZTEST(devicetree_api_ext, test_hwspinlock_dt_spec)
+{
+	for (int i = 0; i < ARRAY_SIZE(spec); i++) {
+		zassert_equal(spec[i].dev, DEVICE_DT_GET(TEST_HWSPINLOCK));
+		zassert_equal(spec[i].id, i + 1);
+	}
+
+	zassert_equal(rd.dev, DEVICE_DT_GET(TEST_HWSPINLOCK));
+	zassert_equal(rd.id, 1);
+
+	zassert_equal(wr.dev, DEVICE_DT_GET(TEST_HWSPINLOCK));
+	zassert_equal(wr.id, 2);
+}
+
 ZTEST_SUITE(devicetree_api_ext, NULL, NULL, NULL, NULL, NULL);