1 files changed, 6 insertions, 2 deletions
diff --git a/lib/stm32/f2/rcc.c b/lib/stm32/f2/rcc.c
index b662cebb..e530de47 100644
--- a/lib/stm32/f2/rcc.c
+++ b/lib/stm32/f2/rcc.c
@@ -1,6 +1,6 @@
-/** @defgroup rcc_file RCC
+/** @defgroup rcc_file RCC peripheral API
  *
- * @ingroup STM32F2xx
+ * @ingroup peripheral_apis
  *
  * @section rcc_f2_api_ex Reset and Clock Control API.
  *
@@ -355,6 +355,10 @@ void rcc_clock_setup_hse_3v3(const struct rcc_clock_scale *clock)
 	rcc_set_ppre1(clock->ppre1);
 	rcc_set_ppre2(clock->ppre2);
 
+	/* Disable PLL oscillator before changing its configuration. */
+	rcc_osc_off(RCC_PLL);
+
+	/* Configure the PLL oscillator. */
 	rcc_set_main_pll_hse(clock->pllm, clock->plln,
 			     clock->pllp, clock->pllq);