[PATCH v2 18/21] drm/panel: add devm_drm_panel_add() helper

[Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>]

Add devm_drm_panel_add(), devres-managed version of drm_panel_add().
It's not uncommon for the panel drivers to use devres functions for most
of the resources. Provide corresponding replacement for drm_panel_add().

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/drm_panel.c | 23 +++++++++++++++++++++++
 include/drm/drm_panel.h     |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index d1e6598ea3bc..a6029b699b73 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -101,6 +101,29 @@ void drm_panel_remove(struct drm_panel *panel)
 }
 EXPORT_SYMBOL(drm_panel_remove);
 
+static void drm_panel_add_release(void *data)
+{
+	drm_panel_remove(data);
+}
+
+/**
+ * devm_drm_panel_add - add a panel to the global registry using devres
+ * @panel: panel to add
+ *
+ * Add a panel to the global registry so that it can be looked
+ * up by display drivers. The panel to be added must have been
+ * allocated by devm_drm_panel_alloc(). Unlike drm_panel_add() with this
+ * function there is no need to call drm_panel_remove(), it will be called
+ * automatically.
+ */
+int devm_drm_panel_add(struct device *dev, struct drm_panel *panel)
+{
+	drm_panel_add(panel);
+
+	return devm_add_action_or_reset(dev, drm_panel_add_release, panel);
+}
+EXPORT_SYMBOL(devm_drm_panel_add);
+
 /**
  * drm_panel_prepare - power on a panel
  * @panel: DRM panel
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 2407bfa60236..1fb9148dd095 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -329,6 +329,7 @@ void drm_panel_put(struct drm_panel *panel);
 
 void drm_panel_add(struct drm_panel *panel);
 void drm_panel_remove(struct drm_panel *panel);
+int devm_drm_panel_add(struct device *dev, struct drm_panel *panel);
 
 void drm_panel_prepare(struct drm_panel *panel);
 void drm_panel_unprepare(struct drm_panel *panel);

-- 
2.47.3