Add a function to look up a connector by
device tree node, like what of_drm_find_bridge/panel
does.
Signed-off-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
---
Changes in v2:
- Add function declaration
drivers/gpu/drm/drm_connector.c | 33 +++++++++++++++++++++++++++++++++
include/drm/drm_connector.h | 14 ++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index d877ddc6dc57..516376cd1868 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -743,6 +743,39 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
}
EXPORT_SYMBOL(drm_connector_list_iter_end);
+#ifdef CONFIG_OF
+/**
+ * of_drm_find_connector - look up a connector using a device tree node
+ * @np: device tree node of the connector
+ *
+ *
+ * Return: A pointer to the connector which match the specified device tree
+ * node or NULL if no panel matching the device tree node can be found, or
+ * -ENODEV: the device is not available (status != "okay" or "ok")
+ */
+struct drm_connector *of_drm_find_connector(struct drm_device *dev, const struct device_node *np)
+{
+ struct drm_connector *connector;
+ struct drm_connector_list_iter conn_iter;
+
+ if (!of_device_is_available(np))
+ return ERR_PTR(-ENODEV);
+
+ drm_connector_list_iter_begin(dev, &conn_iter);
+ drm_for_each_connector_iter(connector, &conn_iter) {
+ if (connector->of_node == np) {
+ drm_connector_list_iter_end(&conn_iter);
+ return connector;
+ }
+ }
+ drm_connector_list_iter_end(&conn_iter);
+
+ return NULL;
+}
+EXPORT_SYMBOL(of_drm_find_connector);
+#endif
+
+
static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
{ SubPixelUnknown, "Unknown" },
{ SubPixelHorizontalRGB, "Horizontal RGB" },
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index fd543d1db9b2..d249e0498375 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1129,6 +1129,9 @@ struct drm_connector {
/** @attr: sysfs attributes */
struct device_attribute *attr;
+ /** @of_node: device tree node */
+ struct device_node *of_node;
+
/**
* @head:
*
@@ -1647,6 +1650,17 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
bool drm_connector_has_possible_encoder(struct drm_connector *connector,
struct drm_encoder *encoder);
+#if defined(CONFIG_OF)
+struct drm_connector *
+of_drm_find_connector(struct drm_device *dev, const struct device_node *np);
+#else
+static inline struct drm_connector *
+of_drm_find_connector(struct drm_device *dev, const struct device_node *np)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
/**
* drm_for_each_connector_iter - connector_list iterator macro
* @connector: &struct drm_connector pointer used as cursor
--
2.17.1
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