tests: drivers: test fake-pwm on native_sim for pwm_api test

create native_sim overlay to use fake pwm for test of pwm_api

Signed-off-by: Nathan Olff <nathan@kickmaker.net>

tests/drivers/pwm/pwm_api/boards/native_sim.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2024 Kickmaker
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/{
+	pwm0: pwm0 {
+		compatible = "zephyr,fake-pwm";
+		status = "okay";
+		#pwm-cells = <2>;
+		frequency = <10000000>;
+	};
+
+	aliases {
+		pwm-0 = &pwm0;
+	};
+};

tests/drivers/pwm/pwm_api/src/test_pwm.c

@@ -79,6 +79,11 @@
 #define DEFAULT_PULSE_NSEC 1000000
 #endif
 
+#if DT_HAS_COMPAT_STATUS_OKAY(zephyr_fake_pwm)
+#include <zephyr/fff.h>
+DEFINE_FFF_GLOBALS;
+#endif
+
 #if defined CONFIG_BOARD_SAM_E70_XPLAINED
 #define DEFAULT_PWM_PORT 2 /* PWM on EXT2 connector, pin 8 */
 #elif defined CONFIG_PWM_NRFX

tests/drivers/pwm/pwm_api/testcase.yaml

@@ -30,3 +30,8 @@ tests:
     platform_allow:
       - frdm_mcxn947/mcxn947/cpu0
       - frdm_mcxn947/mcxn947/cpu0/qspi
+  drivers.pwm.native_sim:
+    platform_allow:
+      - native_sim
+    integration_platforms:
+      - native_sim