linux-kernel - [PATCH 1/3] media: v4l: async: add helper API v4l2_async_pad_init_and_register

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Message-Id: <20260210-v4l2_init_register-v1-1-8fe43f7d349f@nxp.com>
Date: Tue, 10 Feb 2026 16:42:21 -0500
From: Frank Li <Frank.Li@....com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Michael Riesch <michael.riesch@...labora.com>, 
 Maxime Ripard <mripard@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, Frank Li <Frank.Li@....com>
Subject: [PATCH 1/3] media: v4l: async: add helper API
 v4l2_async_pad_init_and_register_subdev()

Add the helper API v4l2_async_pad_init_and_register_subdev(), which
combines media_entity_pads_init(), v4l2_subdev_init_finalize(), and
v4l2_async_register_subdev() into a single call.

Reduce code duplication and simplify error handling in drivers.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/media/v4l2-core/v4l2-async.c | 30 ++++++++++++++++++++++++++++++
 include/media/v4l2-async.h           | 18 ++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 1c08bba9ecb91f46b7479da613d6c1688d4b0b5c..65e4aa46372a02f9ddc04571436f46c90259e200 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 
+#include <media/media-entity.h>
 #include <media/v4l2-async.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-fwnode.h>
@@ -881,6 +882,35 @@ int __v4l2_async_register_subdev(struct v4l2_subdev *sd, struct module *module)
 }
 EXPORT_SYMBOL(__v4l2_async_register_subdev);
 
+int __v4l2_async_pad_init_and_register_subdev(struct v4l2_subdev *sd,
+					      u16 num_pads,
+					      struct media_pad *pads,
+					      struct module *module)
+{
+	int ret;
+
+	ret = media_entity_pads_init(&sd->entity, num_pads, pads);
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_init_finalize(sd);
+	if (ret)
+		goto err_entity_cleanup;
+
+	ret = __v4l2_async_register_subdev(sd, module);
+	if (ret)
+		goto err_subdev_cleanup;
+
+	return 0;
+
+err_subdev_cleanup:
+	v4l2_subdev_cleanup(sd);
+err_entity_cleanup:
+	media_entity_cleanup(&sd->entity);
+	return ret;
+}
+EXPORT_SYMBOL(__v4l2_async_pad_init_and_register_subdev);
+
 void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
 {
 	struct v4l2_async_connection *asc, *asc_tmp;
diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
index f26c323e9c963065fd7c19d6d9835df1194bc069..81f1f418a246902178d5fa8f9d5e48b14301386f 100644
--- a/include/media/v4l2-async.h
+++ b/include/media/v4l2-async.h
@@ -336,6 +336,24 @@ int __v4l2_async_register_subdev(struct v4l2_subdev *sd, struct module *module);
 int __must_check
 v4l2_async_register_subdev_sensor(struct v4l2_subdev *sd);
 
+struct media_pad;
+int __must_check
+__v4l2_async_pad_init_and_register_subdev(struct v4l2_subdev *sd, u16 num_pads,
+					  struct media_pad *pads,
+					  struct module *module);
+/**
+ * v4l2_async_pad_init_and_register_subdev - Initialize the entity pads and
+ *					     registers a sub-device to the
+ *					     asynchronous subdevice framework
+ * @sd: pointer to &struct v4l2_subdev
+ * @num_pads: total number of sink and source pads
+ * @pads: Array of @num_pads pads.
+ *
+ * Returns an error on failure, 0 on success.
+ */
+#define v4l2_async_pad_init_and_register_subdev(sd, num_pads, pads)	\
+	__v4l2_async_pad_init_and_register_subdev(sd, num_pads, pads,	\
+						  THIS_MODULE)
 /**
  * v4l2_async_unregister_subdev - unregisters a sub-device to the asynchronous
  *	subdevice framework

-- 
2.43.0