The RTC ioctl() method is now a configuration option

arch/arm/src/stm32/stm32_rtc_lowerhalf.c

@@ -118,7 +118,9 @@ static const struct rtc_ops_s g_rtc_ops =
   .rdwkalm    = NULL,
   .setwkalm   = NULL,
 #endif
+#ifdef CONFIG_RTC_IOCTL
   .ioctl      = NULL,
+#endif
   .destroy    = NULL,
 };
 

drivers/timers/Kconfig

@@ -107,6 +107,13 @@ config RTC_EPOCHYEAR
 		With some RTCs, these operations can be used to read or to set the RTC's
 		Epoch, respectively.
 
+config RTC_IOCTL
+	bool "RTC IOCTLs"
+	default n
+	---help---
+		Support the RTC interface ioctl() method.  This allows you to add
+		architecture-specific RTC operations to the RTC interface
+
 endif # RTC_DRIVER
 endif # RTC
 

drivers/timers/rtc.c

@@ -509,10 +509,12 @@ static int rtc_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
     default:
       {
         ret = -ENOTTY;
+#ifdef CONFIG_RTC_IOCTL
         if (ops->ioctl)
           {
             ret = ops->ioctl(upper->lower, cmd, arg);
           }
+#endif
       }
       break;
     }

include/nuttx/rtc.h

@@ -416,11 +416,13 @@ struct rtc_ops_s
                        FAR const struct rtc_wkalrm *wkalrm);
 #endif
 
+#ifdef CONFIG_RTC_IOCTL
    /* Support for architecture-specific RTC operations */
 
   CODE int (*ioctl)(FAR struct rtc_lowerhalf_s *lower, int cmd,
                     unsigned long arg);
-   
+#endif
+
    /* The driver has been unlinked and there are no further open references
     * to the driver.
     */