dm: video: Add a uclass for display port

eDP (Embedded DisplayPort) is a standard widely used in laptops to drive
LCD panels. Add a uclass for this which supports a few simple operations.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 51728b3..62af63a 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -88,3 +88,10 @@
 	hardware and LCD panel id retrieval (if the panel can report it). The
 	option takes a string in the format understood by 'name_to_gpio'
 	function, e.g. PH1 for pin 1 of port H.
+
+config DISPLAY_PORT
+	bool "Enable DisplayPort support"
+	help
+	   eDP (Embedded DisplayPort) is a standard widely used in laptops
+	   to drive LCD panels. This framework provides support for enabling
+	   these displays where supported by the video hardware.