[PATCH] drm/connector: Add of_drm_find_connector

* [PATCH] drm/connector: Add of_drm_find_connector
@ 2020-06-30 12:01 Andy Yan
  2020-07-01 16:43   ` kernel test robot
  0 siblings, 1 reply; 3+ messages in thread
From: Andy Yan @ 2020-06-30 12:01 UTC (permalink / raw)
  To: daniel; +Cc: airlied, dri-devel, tzimmermann, Andy Yan

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@rock-chips.com>
---

 drivers/gpu/drm/drm_connector.c | 33 +++++++++++++++++++++++++++++++++
 include/drm/drm_connector.h     |  3 +++
 2 files changed, 36 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..63932bfae84a 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:
 	 *
-- 
2.17.1



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