drm/tilcdc: add support for LCD panels (v5)

Add an output panel driver for LCD panels.  Tested with LCD3 cape on
beaglebone.

v1: original
v2: s/of_find_node_by_name()/of_get_child_by_name()/ from Pantelis
    Antoniou
v3: add backlight support
v4: rebase to latest of video timing helpers
v5: remove some unneeded fields from panel-info struct, add DT bindings
    docs

Signed-off-by: Rob Clark <robdclark@gmail.com>
Tested-by: Koen Kooi <koen@dominion.thruhere.net>
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 25f3add..c5b592dc 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -21,6 +21,7 @@
 #include "tilcdc_regs.h"
 #include "tilcdc_tfp410.h"
 #include "tilcdc_slave.h"
+#include "tilcdc_panel.h"
 
 #include "drm_fb_helper.h"
 
@@ -589,6 +590,7 @@
 	DBG("init");
 	tilcdc_tfp410_init();
 	tilcdc_slave_init();
+	tilcdc_panel_init();
 	return platform_driver_register(&tilcdc_platform_driver);
 }
 
@@ -597,6 +599,7 @@
 	DBG("fini");
 	tilcdc_tfp410_fini();
 	tilcdc_slave_fini();
+	tilcdc_panel_fini();
 	platform_driver_unregister(&tilcdc_platform_driver);
 }