drm/bridge: panel: Introduce drmm_panel_bridge_add

Unlike what can be found for other entities, there's no DRM-managed
function to create a panel_bridge instance from a panel.

Let's introduce one.
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-11-maxime@cerno.tech

drivers/gpu/drm/bridge/panel.c

@@ -8,6 +8,7 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_encoder.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
@@ -367,6 +368,44 @@ struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
 }
 EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed);
 
+static void drmm_drm_panel_bridge_release(struct drm_device *drm, void *ptr)
+{
+	struct drm_bridge *bridge = ptr;
+
+	drm_panel_bridge_remove(bridge);
+}
+
+/**
+ * drmm_panel_bridge_add - Creates a DRM-managed &drm_bridge and
+ *                         &drm_connector that just calls the
+ *                         appropriate functions from &drm_panel.
+ *
+ * @drm: DRM device to tie the bridge lifetime to
+ * @panel: The drm_panel being wrapped.  Must be non-NULL.
+ *
+ * This is the DRM-managed version of drm_panel_bridge_add() which
+ * automatically calls drm_panel_bridge_remove() when @dev is cleaned
+ * up.
+ */
+struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm,
+					 struct drm_panel *panel)
+{
+	struct drm_bridge *bridge;
+	int ret;
+
+	bridge = drm_panel_bridge_add_typed(panel, panel->connector_type);
+	if (IS_ERR(bridge))
+		return bridge;
+
+	ret = drmm_add_action_or_reset(drm, drmm_drm_panel_bridge_release,
+				       bridge);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return bridge;
+}
+EXPORT_SYMBOL(drmm_panel_bridge_add);
+
 /**
  * drm_panel_bridge_connector - return the connector for the panel bridge
  * @bridge: The drm_bridge.

include/drm/drm_bridge.h

@@ -930,6 +930,8 @@ struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
 struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
 						   struct drm_panel *panel,
 						   u32 connector_type);
+struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm,
+					     struct drm_panel *panel);
 struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge);
 #else
 static inline bool drm_bridge_is_panel(const struct drm_bridge *bridge)