msm: camera: sync: Enable driver registration with dtsi match

Currently sync driver is independent from dtsi matching in order
to get it probe. Update the logic to make sure probe is getting
invoked if respective dtsi is present.

CRs-Fixed: 2590413
Change-Id: I69124e49d68e223d082521a9431cb7e8d846e8d7
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>

drivers/cam_sync/cam_sync.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/init.h>
@@ -1107,51 +1107,48 @@ vdev_fail:
 
 static int cam_sync_remove(struct platform_device *pdev)
 {
+	int i;
+
 	v4l2_device_unregister(sync_dev->vdev->v4l2_dev);
 	cam_sync_media_controller_cleanup(sync_dev);
 	video_device_release(sync_dev->vdev);
 	debugfs_remove_recursive(sync_dev->dentry);
 	sync_dev->dentry = NULL;
+
+	for (i = 0; i < CAM_SYNC_MAX_OBJS; i++)
+		spin_lock_init(&sync_dev->row_spinlocks[i]);
 	kfree(sync_dev);
 	sync_dev = NULL;
 
 	return 0;
 }
 
-static struct platform_device cam_sync_device = {
-	.name = "cam_sync",
-	.id = -1,
+static const struct of_device_id cam_sync_dt_match[] = {
+	{.compatible = "qcom,cam-sync"},
+	{}
 };
 
+MODULE_DEVICE_TABLE(of, cam_sync_dt_match);
+
 static struct platform_driver cam_sync_driver = {
 	.probe = cam_sync_probe,
 	.remove = cam_sync_remove,
 	.driver = {
 		.name = "cam_sync",
 		.owner = THIS_MODULE,
+		.of_match_table = cam_sync_dt_match,
 		.suppress_bind_attrs = true,
 	},
 };
 
 int cam_sync_init(void)
 {
-	int rc;
-	rc = platform_device_register(&cam_sync_device);
-	if (rc)
-		return -ENODEV;
-
 	return platform_driver_register(&cam_sync_driver);
 }
 
 void cam_sync_exit(void)
 {
-	int idx;
-
-	for (idx = 0; idx < CAM_SYNC_MAX_OBJS; idx++)
-		spin_lock_init(&sync_dev->row_spinlocks[idx]);
 	platform_driver_unregister(&cam_sync_driver);
-	platform_device_unregister(&cam_sync_device);
-	kfree(sync_dev);
 }
 
 MODULE_DESCRIPTION("Camera sync driver");