drm/panel: simple: Specify bus width and flags for EDT displays

The display has a 18-Bit parallel LCD interface, require DE to be
active high and data driven by the controller on falling pixel
clock edge (display samples on rising edge).

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/panel/panel-simple.c

@@ -802,6 +802,8 @@ static const struct panel_desc edt_et057090dhu = {
 		.width = 115,
 		.height = 86,
 	},
+	.bus_format = MEDIA_BUS_FMT_RGB666_1X18,
+	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_NEGEDGE,
 };
 
 static const struct drm_display_mode edt_etm0700g0dh6_mode = {
@@ -826,6 +828,8 @@ static const struct panel_desc edt_etm0700g0dh6 = {
 		.width = 152,
 		.height = 91,
 	},
+	.bus_format = MEDIA_BUS_FMT_RGB666_1X18,
+	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_NEGEDGE,
 };
 
 static const struct drm_display_mode foxlink_fl500wvr00_a0t_mode = {