drm/panel: abstract of_panel_find()

Add a helper to wrap OF-specific calls in drm_panel_add_follower() in
preparation for adding an ACPI equivalent in the future. No functional
changes.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250522100036.2529624-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 16 insertions, 7 deletions

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 650de4da0853..fee65dc65979 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -473,6 +473,21 @@ int of_drm_get_panel_orientation(const struct device_node *np,
 EXPORT_SYMBOL(of_drm_get_panel_orientation);
 #endif
 
+static struct drm_panel *of_find_panel(struct device *follower_dev)
+{
+	struct device_node *panel_np;
+	struct drm_panel *panel;
+
+	panel_np = of_parse_phandle(follower_dev->of_node, "panel", 0);
+	if (!panel_np)
+		return ERR_PTR(-ENODEV);
+
+	panel = of_drm_find_panel(panel_np);
+	of_node_put(panel_np);
+
+	return panel;
+}
+
 /**
  * drm_is_panel_follower() - Check if the device is a panel follower
  * @dev: The 'struct device' to check
@@ -518,16 +533,10 @@ EXPORT_SYMBOL(drm_is_panel_follower);
 int drm_panel_add_follower(struct device *follower_dev,
 			   struct drm_panel_follower *follower)
 {
-	struct device_node *panel_np;
 	struct drm_panel *panel;
 	int ret;
 
-	panel_np = of_parse_phandle(follower_dev->of_node, "panel", 0);
-	if (!panel_np)
-		return -ENODEV;
-
-	panel = of_drm_find_panel(panel_np);
-	of_node_put(panel_np);
+	panel = of_find_panel(follower_dev);
 	if (IS_ERR(panel))
 		return PTR_ERR(panel);