add rtc-sd2068 driver

package/kernel/rtc-sd2068/Makefile

@@ -0,0 +1,39 @@
+#
+# Copyright (C) 2017 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=rtc-sd2068
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/rtc-sd2068
+  SUBMENU:=Other modules
+  DEPENDS:=@TARGET_ar71xx
+  KCONFIG:=CONFIG_RTC_CLASS=y
+  TITLE:=Driver for RTC SD2068
+  AUTOLOAD:=$(call AutoLoad,70,rtc-sd2068)
+  FILES:=$(PKG_BUILD_DIR)/rtc-sd2068.ko
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+	$(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+	$(MAKE) -C "$(LINUX_DIR)" \
+		CROSS_COMPILE="$(TARGET_CROSS)" \
+		ARCH="$(LINUX_KARCH)" \
+		SUBDIRS="$(PKG_BUILD_DIR)" \
+		EXTRA_CFLAGS="$(BUILDFLAGS)" \
+		modules
+endef
+
+$(eval $(call KernelPackage,rtc-sd2068))

package/kernel/rtc-sd2068/src/Makefile

@@ -0,0 +1,17 @@
+#
+# Makefile for Real Time Clock driver for SD2068
+#
+# Copyright (C) 2017 OpenWrt.org
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version
+# 2 of the License, or (at your option) any later version.
+#
+
+obj-m := rtc-sd2068.o
+
+ifeq ($(MAKING_MODULES),1)
+
+-include $(TOPDIR)/Rules.make
+endif