linux-kernel - [PATCH 2/9] drm/bridge: add drm_bridge_chain_get_last

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Message-Id: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-2-48920b9cf369@bootlin.com>
Date: Wed, 09 Jul 2025 18:48:01 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Liu Ying <victor.liu@....com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH 2/9] drm/bridge: add drm_bridge_chain_get_last_bridge()

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

Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.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 d2454ba83db36f8f0d475b0b37468c2ebe7e921d..9a7e9dd8cbfa54eedb82981032a25009e845a037 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -1343,6 +1343,24 @@ 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

-- 
2.50.0