rtc: export rtc_nvmem_register() to drivers

Export rtc_nvmem_register() so it can be called from drivers instead of
only the core.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/nvmem.c

@@ -14,8 +14,6 @@
 #include <linux/rtc.h>
 #include <linux/sysfs.h>
 
-#include "rtc-core.h"
-
 /*
  * Deprecated ABI compatibility, this should be removed at some point
  */
@@ -105,6 +103,7 @@ int rtc_nvmem_register(struct rtc_device *rtc,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rtc_nvmem_register);
 
 void rtc_nvmem_unregister(struct rtc_device *rtc)
 {

drivers/rtc/rtc-core.h

@@ -46,16 +46,3 @@ static inline const struct attribute_group **rtc_get_dev_attribute_groups(void)
 	return NULL;
 }
 #endif
-
-#ifdef CONFIG_RTC_NVMEM
-int rtc_nvmem_register(struct rtc_device *rtc,
-		       struct nvmem_config *nvmem_config);
-void rtc_nvmem_unregister(struct rtc_device *rtc);
-#else
-static inline int rtc_nvmem_register(struct rtc_device *rtc,
-				     struct nvmem_config *nvmem_config)
-{
-	return -ENODEV;
-}
-static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {}
-#endif

include/linux/rtc.h

@@ -271,4 +271,17 @@ extern int rtc_hctosys_ret;
 #define rtc_hctosys_ret -ENODEV
 #endif
 
+#ifdef CONFIG_RTC_NVMEM
+int rtc_nvmem_register(struct rtc_device *rtc,
+		       struct nvmem_config *nvmem_config);
+void rtc_nvmem_unregister(struct rtc_device *rtc);
+#else
+static inline int rtc_nvmem_register(struct rtc_device *rtc,
+				     struct nvmem_config *nvmem_config)
+{
+	return -ENODEV;
+}
+static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {}
+#endif
+
 #endif /* _LINUX_RTC_H_ */