Merge pull request #9879 from basilfx/feature/efm32_dcdc_off

cpu: efm32: add support for no DC-DC converter

boards/slstk3401a/include/periph_conf.h

@@ -54,6 +54,15 @@ extern "C" {
 #endif
 /** @} */
 
+/**
+ * @name    DC-DC configuration
+ * @{
+ */
+#ifdef EMU_DCDCINIT_OFF
+#error "This option will soft-brick your board. Please remove it."
+#endif
+/** @} */
+
 /**
  * @name    ADC configuration
  * @{

boards/sltb001a/include/periph_conf.h

@@ -54,6 +54,15 @@ extern "C" {
 #endif
 /** @} */
 
+/**
+ * @name    DC-DC configuration
+ * @{
+ */
+#ifdef EMU_DCDCINIT_OFF
+#error "This option will soft-brick your board. Please remove it."
+#endif
+/** @} */
+
 /**
  * @name    ADC configuration
  * @{

cpu/efm32/cpu.c

@@ -56,9 +56,13 @@
  */
 static void dcdc_init(void)
 {
+#ifdef EMU_DCDCINIT_OFF
+    EMU_DCDCPowerOff();
+#else
     EMU_DCDCInit_TypeDef init_dcdc = EMU_DCDCINIT;
 
     EMU_DCDCInit(&init_dcdc);
+#endif
 }
 #endif