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>

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 650de4da0853741d7e4bc2e98a36947b55e24769..fee65dc65979d6c03753967cefa6d5c4e597277d 100644 (file)
--- 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);