tests: kconfig: functions: add tests for dt_compat_enabled_num

Add tests for the dt_compat_enabled_num Kconfig helper function.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

tests/kconfig/functions/Kconfig

@@ -113,4 +113,22 @@ config KCONFIG_MAX_10_3_2
 	int
 	default $(max, 0xa, 3, 0b10)
 
+DT_COMPAT_VND_GPIO := vnd,gpio
+
+config KCONFIG_VND_GPIO_ENABLED_NUM_4
+	int
+	default $(dt_compat_enabled_num,$(DT_COMPAT_VND_GPIO))
+
+DT_COMPAT_VND_CAN_CONTROLLER := vnd,can-controller
+
+config KCONFIG_VND_CAN_CONTROLLER_ENABLED_NUM_2
+	int
+	default $(dt_compat_enabled_num,$(DT_COMPAT_VND_CAN_CONTROLLER))
+
+DT_COMPAT_VND_PWM := vnd,pwm
+
+config KCONFIG_VND_PWM_ENABLED_NUM_0
+	int
+	default $(dt_compat_enabled_num,$(DT_COMPAT_VND_PWM))
+
 source "Kconfig.zephyr"

tests/kconfig/functions/app.overlay

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2025 Vestas Wind Systems A/S
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	test {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		test_gpio_0: gpio@1000 {
+			compatible = "vnd,gpio";
+			reg = <0x1000 0x1000>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			status = "okay";
+		};
+
+		test_gpio_1: gpio@2000 {
+			compatible = "vnd,gpio";
+			reg = <0x2000 0x1000>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			status = "okay";
+		};
+
+		test_gpio_2: gpio@3000 {
+			compatible = "vnd,gpio";
+			reg = <0x3000 0x1000>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			status = "okay";
+		};
+
+		test_gpio_3: gpio@4000 {
+			compatible = "vnd,gpio";
+			reg = <0x4000 0x1000>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			status = "okay";
+		};
+
+		test_can_0: gpio@5000 {
+			compatible = "vnd,can-controller";
+			reg = <0x5000 0x1000>;
+			status = "okay";
+		};
+
+		test_can_1: gpio@6000 {
+			compatible = "vnd,can-controller";
+			reg = <0x6000 0x1000>;
+			status = "okay";
+		};
+
+		test_can_2: gpio@7000 {
+			compatible = "vnd,can-controller";
+			reg = <0x7000 0x1000>;
+			status = "disabled";
+		};
+	};
+};

tests/kconfig/functions/src/main.c

@@ -45,4 +45,11 @@ ZTEST(test_kconfig_functions, test_min_max)
 	zassert_equal(CONFIG_KCONFIG_MAX_10_3_2, MAX(MAX(10, 3), 2));
 }
 
+ZTEST(test_kconfig_functions, test_dt_num_compat_enabled)
+{
+	zassert_equal(CONFIG_KCONFIG_VND_GPIO_ENABLED_NUM_4, 4);
+	zassert_equal(CONFIG_KCONFIG_VND_CAN_CONTROLLER_ENABLED_NUM_2, 2);
+	zassert_equal(CONFIG_KCONFIG_VND_PWM_ENABLED_NUM_0, 0);
+}
+
 ZTEST_SUITE(test_kconfig_functions, NULL, NULL, NULL, NULL, NULL);