From fc854d22b7595ef2f092a36ceeb904569cba26ff Mon Sep 17 00:00:00 2001
From: Frederic Pillon <frederic.pillon@st.com>
Date: Mon, 27 Sep 2021 18:55:06 +0200
Subject: [PATCH] fix: enable peripheral bus clock when SRD domain is in DRUN

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>
---
 src/STM32RTC.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/STM32RTC.cpp b/src/STM32RTC.cpp
index b95a6ea..1c0ac13 100644
--- a/src/STM32RTC.cpp
+++ b/src/STM32RTC.cpp
@@ -915,6 +915,9 @@ void STM32RTC::setY2kEpoch(uint32_t ts)
 void STM32RTC::configForLowPower(Source_Clock source)
 {
 #if defined(HAL_PWR_MODULE_ENABLED)
+#ifdef __HAL_RCC_RTCAPB_CLKAM_ENABLE
+  __HAL_RCC_RTCAPB_CLKAM_ENABLE();
+#endif
   if (!_configured) {
     _clockSource = source;
     // Enable RTC