drm/bridge: panel: Name an associated backlight device

Pass the DRM connector name to any configured backlight
device so that userspace can associate the two items.

Ideally this should be in drm_panel, but it is bridge/panel
that creates the drm_connector and therefore knows the name.

Signed-off-by: Dave Stevenson <[email protected]>

Author: 6by9

drivers/gpu/drm/bridge/panel.c

@@ -14,6 +14,7 @@
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
+#include <linux/backlight.h>
 
 struct panel_bridge {
 	struct drm_bridge bridge;
@@ -86,6 +87,9 @@ static int panel_bridge_attach(struct drm_bridge *bridge,
 	drm_connector_attach_encoder(&panel_bridge->connector,
 					  bridge->encoder);
 
+	backlight_set_display_name(panel_bridge->panel->backlight,
+				   panel_bridge->connector.name);
+
 	if (bridge->dev->registered) {
 		if (connector->funcs->reset)
 			connector->funcs->reset(connector);