cpu: k60: add periph/pm support

cpu/k60/Makefile.features

@@ -0,0 +1 @@
+FEATURES_PROVIDED += periph_pm

cpu/kinetis_common/Makefile.include

@@ -10,6 +10,9 @@ export UNDEF += $(BINDIR)/kinetis_common/fcfield.o
 # include kinetis common periph drivers
 export USEMODULE += kinetis_common_periph
 
+#include layered power mode module
+USEMODULE += pm_layered
+
 # Define a recipe to build the watchdog disable binary, used when flashing
 $(RIOTCPU)/kinetis_common/dist/wdog-disable.bin: $(RIOTCPU)/kinetis_common/dist/wdog-disable.s
 	$(AD)$(MAKE) -C $(RIOTCPU)/kinetis_common/dist/ $(notdir $@)

cpu/kinetis_common/include/periph_cpu.h

@@ -239,6 +239,11 @@ enum {
  */
 void gpio_init_port(gpio_t pin, uint32_t pcr);
 
+/**
+ * @brief   define number of usable power modes
+ */
+#define PM_NUM_MODES    (1U)
+
 #ifdef __cplusplus
 }
 #endif

cpu/kinetis_common/periph/pm.c

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ *               2014 Eistec AB
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     cpu_kinetis_common
+ * @{
+ *
+ * @file
+ * @brief       Implementation of the kernels power management interface
+ *
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * @}
+ */
+
+#include "periph/pm.h"
+
+#define ENABLE_DEBUG (0)
+#include "debug.h"
+
+
+void pm_set(unsigned mode)
+{
+    switch (mode) {
+        case 0:
+            SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
+            break;
+    }
+
+    /* Executes a device DSB (Data Synchronization Barrier) */
+    __DSB();
+    /* Enter standby mode */
+    __WFI();
+}