linux-kernel - [PATCH] [media] ov9650: add support for asynchronous probing

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Date:   Thu,  8 Sep 2016 09:05:40 -0400
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     linux-kernel@...r.kernel.org
Cc:     "H . Nikolaus Schaller" <hns@...delico.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Guennadi Liakhovetski <g.liakhovetski@....de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-media@...r.kernel.org
Subject: [PATCH] [media] ov9650: add support for asynchronous probing

Allow the sub-device to be probed asynchronously so a bridge driver that's
waiting for the device can be notified and its .bound callback executed.

Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

---

 drivers/media/i2c/ov9650.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov9650.c b/drivers/media/i2c/ov9650.c
index be5a7fd4f076..502c72238a4a 100644
--- a/drivers/media/i2c/ov9650.c
+++ b/drivers/media/i2c/ov9650.c
@@ -23,6 +23,7 @@
 #include <linux/videodev2.h>
 
 #include <media/media-entity.h>
+#include <media/v4l2-async.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-event.h>
@@ -1520,6 +1521,10 @@ static int ov965x_probe(struct i2c_client *client,
 	/* Update exposure time min/max to match frame format */
 	ov965x_update_exposure_ctrl(ov965x);
 
+	ret = v4l2_async_register_subdev(sd);
+	if (ret < 0)
+		goto err_ctrls;
+
 	return 0;
 err_ctrls:
 	v4l2_ctrl_handler_free(sd->ctrl_handler);
@@ -1532,7 +1537,7 @@ static int ov965x_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 
-	v4l2_device_unregister_subdev(sd);
+	v4l2_async_unregister_subdev(sd);
 	v4l2_ctrl_handler_free(sd->ctrl_handler);
 	media_entity_cleanup(&sd->entity);
 
-- 
2.7.4