[PATCH v2 2/9] drm/bridge: add drm_bridge_chain_get_last_bridge()

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

Add an equivalent of drm_bridge_chain_get_first_bridge() to get the last
bridge.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 include/drm/drm_bridge.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 620e119cc24c3491c2be5f08efaf51dfa8f708b3..ce51b73e323ec5e188e84c9577803bd4934daf2b 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -1358,6 +1358,24 @@ drm_bridge_chain_get_first_bridge(struct drm_encoder *encoder)
 						       struct drm_bridge, chain_node));
 }
 
+/**
+ * drm_bridge_chain_get_last_bridge() - Get the last bridge in the chain
+ * @encoder: encoder object
+ *
+ * The refcount of the returned bridge is incremented. Use drm_bridge_put()
+ * when done with it.
+ *
+ * RETURNS:
+ * the last bridge in the chain, or NULL if @encoder has no bridge attached
+ * to it.
+ */
+static inline struct drm_bridge *
+drm_bridge_chain_get_last_bridge(struct drm_encoder *encoder)
+{
+	return drm_bridge_get(list_last_entry_or_null(&encoder->bridge_chain,
+						      struct drm_bridge, chain_node));
+}
+
 /**
  * drm_for_each_bridge_in_chain() - Iterate over all bridges present in a chain
  * @encoder: the encoder to iterate bridges on

-- 
2.50.1