OMAP2, 3: DSS2: Create new file display.c for central dss driver registration.

A new file display.c is introduced for display driver init, which adds a function
omap_display_init to do the DSS driver registration. This is the first step in moving
away registration of DSS from board files into a common place.

Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Senthilvadivu Guruswamy <svadivu@ti.com>
Signed-off-by: Sumit Semwal <sumit.semwal@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/arch/arm/plat-omap/include/plat/display.h b/arch/arm/plat-omap/include/plat/display.h
index 537f4e4..0f140ec 100644
--- a/arch/arm/plat-omap/include/plat/display.h
+++ b/arch/arm/plat-omap/include/plat/display.h
@@ -23,6 +23,7 @@
 #include <linux/list.h>
 #include <linux/kobject.h>
 #include <linux/device.h>
+#include <linux/platform_device.h>
 #include <asm/atomic.h>
 
 #define DISPC_IRQ_FRAMEDONE		(1 << 0)
@@ -226,6 +227,16 @@
 	struct omap_dss_device *default_device;
 };
 
+#if defined(CONFIG_OMAP2_DSS_MODULE) || defined(CONFIG_OMAP2_DSS)
+/* Init with the board info */
+extern int omap_display_init(struct omap_dss_board_info *board_data);
+#else
+static inline int omap_display_init(struct omap_dss_board_info *board_data)
+{
+	return 0;
+}
+#endif
+
 struct omap_video_timings {
 	/* Unit: pixels */
 	u16 x_res;