sunxi: add modules for AC100 MFD and RTC

The X-Powers AC100 is a multi-function IC used to provide RTC
and audio codec via RSB (reduced serial bus, an Allwinner-
speciality). On some boards using the A80/A83T SoCs, aside
from the RTC functionality, the RTC is used as a clocksource
for the Ampak WiFi/BT modules.

Add modules for the core MFD support and the RTC.

Signed-off-by: Zoltan HERPAI <[email protected]>

target/linux/sunxi/modules.mk

@@ -2,6 +2,40 @@
 #
 # Copyright (C) 2013-2016 OpenWrt.org
 
+define KernelPackage/mfd-ac100
+    SUBMENU:=$(OTHER_MENU)
+    TITLE:=X-Powers AC100 MFD support
+    DEPENDS:=@TARGET_sunxi
+    KCONFIG:= \
+	CONFIG_MFD_AC100
+    FILES:=$(LINUX_DIR)/drivers/mfd/ac100.ko
+    AUTOLOAD:=$(call AutoLoad,50,ac100)
+endef
+
+define KernelPackage/mfd-ac100/description
+ Support for the X-Powers AC100 RTC/audio chip
+endef
+
+$(eval $(call KernelPackage,mfd-ac100))
+
+define KernelPackage/rtc-ac100
+    SUBMENU:=$(OTHER_MENU)
+    TITLE:=X-Powers AC100 RTC support
+    DEPENDS:=@TARGET_sunxi +kmod-mfd-ac100
+    $(call AddDepends/rtc)
+    KCONFIG:= \
+	CONFIG_RTC_DRV_AC100 \
+	CONFIG_RTC_CLASS=y
+    FILES:=$(LINUX_DIR)/drivers/rtc/rtc-ac100.ko
+    AUTOLOAD:=$(call AutoLoad,50,rtc-ac100)
+endef
+
+define KernelPackage/rtc-ac100/description
+ Support for the X-Powers AC100 RTC
+endef
+
+$(eval $(call KernelPackage,rtc-ac100))
+
 define KernelPackage/rtc-sunxi
     SUBMENU:=$(OTHER_MENU)
     TITLE:=Sunxi SoC built-in RTC support