cpu/native: pm: fix build with pm_layered

cpu/native/include/periph_cpu.h

@@ -32,6 +32,18 @@ extern "C" {
 #define CPUID_LEN           (4U)
 #endif
 
+/**
+ * @name    Power mode configuration
+ */
+#ifndef PM_NUM_MODES
+#define PM_NUM_MODES        (1U)
+#endif
+
+/**
+ * @brief   We provide our own pm_off() function for the native CPU
+ */
+#define PROVIDES_PM_LAYERED_OFF
+
 /* GPIO configuration only if the module is available (=Linux) */
 #if defined(MODULE_PERIPH_GPIO_LINUX) || defined(DOXYGEN)
 #include <linux/gpio.h>

cpu/native/periph/pm.c

@@ -36,7 +36,7 @@
 #define ENABLE_DEBUG 0
 #include "debug.h"
 
-void pm_set_lowest(void)
+static void _native_sleep(void)
 {
     _native_in_syscall++; /* no switching here */
     real_pause();
@@ -48,6 +48,20 @@ void pm_set_lowest(void)
     }
 }
 
+#if !defined(MODULE_PM_LAYERED)
+void pm_set_lowest(void)
+{
+    _native_sleep();
+}
+#endif
+
+void pm_set(unsigned mode)
+{
+    if (mode == 0) {
+        _native_sleep();
+    }
+}
+
 void pm_off(void)
 {
     puts("\nnative: exiting");

sys/include/pm_layered.h

@@ -34,6 +34,7 @@
 #ifndef PM_LAYERED_H
 #define PM_LAYERED_H
 
+#include <stdint.h>
 #include "periph_cpu.h"
 
 #ifdef __cplusplus