kernel: Add kmod-mfd

Package the mfd-core.ko kernel module. It is selected by the
kmod-hwmon-gsc already.

Link: https://github.com/openwrt/openwrt/pull/15833


Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
(cherry picked from commit 8b4fd1c0dece936dc2c79f2a17d824512e7e7df3)
Link: https://github.com/openwrt/openwrt/pull/15898


Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/linux/modules/hwmon.mk

@@ -116,7 +116,7 @@ define KernelPackage/hwmon-gsc
 	$(LINUX_DIR)/drivers/mfd/gateworks-gsc.ko \
 	$(LINUX_DIR)/drivers/hwmon/gsc-hwmon.ko
   AUTOLOAD:=$(call AutoLoad,20,gsc-hwmon,1)
-  $(call AddDepends/hwmon,+kmod-i2c-core)
+  $(call AddDepends/hwmon,+kmod-i2c-core +kmod-mfd)
 endef
 
 define KernelPackage/hwmon-gsc/description

package/kernel/linux/modules/other.mk

@@ -780,6 +780,18 @@ endef
 $(eval $(call KernelPackage,rtc-s35390a))
 
 
+define KernelPackage/mfd
+  SUBMENU:=$(OTHER_MENU)
+  TITLE:=Multifunction device drivers
+  HIDDEN:=1
+  KCONFIG:=CONFIG_MFD_CORE
+  FILES:=$(LINUX_DIR)/drivers/mfd/mfd-core.ko
+  AUTOLOAD:=$(call AutoLoad,10,mfd-core)
+endef
+
+$(eval $(call KernelPackage,mfd))
+
+
 define KernelPackage/mtdtests
   SUBMENU:=$(OTHER_MENU)
   TITLE:=MTD subsystem tests