drm/omap: add omapdss-base.ko

We are working towards enabling omapdss6, which will consists of a new
dss, dispc and dpi drivers. omapdss6 will be a new module. The panel,
encoder and omapdrm will need to use either the current omapdss driver
or the new omapdss6 driver, depending on the platform.

This will be implemented with a common base module and function
pointers.

This patch adds a skeleton omapdss-base.ko module, to which we'll be
moving common dss functionality like registration of the panels.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/Kconfig

 config OMAP2_DSS_INIT
 	bool
 
+config OMAP_DSS_BASE
+	tristate
+
 menuconfig OMAP2_DSS
         tristate "OMAP2+ Display Subsystem support"
+	select OMAP_DSS_BASE
 	select VIDEOMODE_HELPERS
 	select OMAP2_DSS_INIT
 	select HDMI

drivers/gpu/drm/omapdrm/dss/Makefile

 obj-$(CONFIG_OMAP2_DSS_INIT) += omapdss-boot-init.o
+
+obj-$(CONFIG_OMAP_DSS_BASE) += omapdss-base.o
+omapdss-base-y := base.o
+
 obj-$(CONFIG_OMAP2_DSS) += omapdss.o
 # Core DSS files
 omapdss-y := core.o dss.o dss_features.o dispc.o dispc_coefs.o display.o \

drivers/gpu/drm/omapdrm/dss/base.c

+#include <linux/kernel.h>
+#include <linux/module.h>
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("OMAP Display Subsystem Base");
+MODULE_LICENSE("GPL v2");