RFC: drm/lcdc: add support for LCD panels

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

TODO: need some way to control the appropriate backlight device
TODO: probably want to make the DT bindings more generic for panel-info

Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/lcdc/Kconfig

@@ -4,6 +4,8 @@ config DRM_LCDC
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
 	select DRM_GEM_CMA_HELPER
+	select DISPLAY_TIMING
+	select OF_DISPLAY_TIMINGS
 	help
 	  Choose this option if you have an TI SoC with LCDC display
 	  controller, for example AM33xx in beagle-bone, DA8xx, or

drivers/gpu/drm/lcdc/Makefile

@@ -3,6 +3,7 @@ ccflags-y := -Iinclude/drm -Werror
 lcdc-y := \
 	lcdc_crtc.o \
 	lcdc_tfp410.o \
+	lcdc_panel.o \
 	lcdc_drv.o
 
 obj-$(CONFIG_DRM_LCDC)	+= lcdc.o

drivers/gpu/drm/lcdc/lcdc_drv.c

@@ -20,6 +20,7 @@
 #include "lcdc_drv.h"
 #include "lcdc_regs.h"
 #include "lcdc_tfp410.h"
+#include "lcdc_panel.h"
 
 #include "drm_fb_helper.h"
 
@@ -586,13 +587,15 @@ static int __init lcdc_drm_init(void)
 {
 	DBG("init");
 	lcdc_tfp410_init();
+	lcdc_panel_init();
 	return platform_driver_register(&lcdc_platform_driver);
 }
 
 static void __exit lcdc_drm_fini(void)
 {
 	DBG("fini");
 	lcdc_tfp410_fini();
+	lcdc_panel_fini();
 	platform_driver_unregister(&lcdc_platform_driver);
 }