drm: panel: simple-panel: add support for bus_format retrieval

Provide a way to specify panel requirement in terms of supported media bus
format (particularly useful for panels connected to an RGB or LVDS bus).

Signed-off-by: Boris Brezillon <[e-mail]>
Acked-by: Thierry Reding <[e-mail]>

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

···
 		unsigned int disable;
 		unsigned int unprepare;
 	} delay;
+
+	u32 bus_format;
 };
 
 struct panel_simple {
···
 	connector->display_info.bpc = panel->desc->bpc;
 	connector->display_info.width_mm = panel->desc->size.width;
 	connector->display_info.height_mm = panel->desc->size.height;
+	if (panel->desc->bus_format)
+		drm_display_info_set_bus_formats(&connector->display_info,
+						 &panel->desc->bus_format, 1);
 
 	return num;
 }