media: mc: Set bus_info in media_device_init()

Set bus_info field based on struct device in media_device_init() and
remove corresponding code from drivers.

Also update media_device_init() documentation: the dev field must be now
initialised before calling it.

Signed-off-by: Sakari Ailus <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/mc/mc-device.c

···
 
 	atomic_set(&mdev->request_id, 0);
 
+	if (!*mdev->bus_info)
+		media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info),
+				   mdev->dev);
+
 	dev_dbg(mdev->dev, "Media device initialized\n");
 }
 EXPORT_SYMBOL_GPL(media_device_init);

drivers/media/pci/intel/ipu3/ipu3-cio2-main.c

···
 	cio2->media_dev.dev = dev;
 	strscpy(cio2->media_dev.model, CIO2_DEVICE_NAME,
 		sizeof(cio2->media_dev.model));
-	snprintf(cio2->media_dev.bus_info, sizeof(cio2->media_dev.bus_info),
-		 "PCI:%s", pci_name(cio2->pci_dev));
 	cio2->media_dev.hw_revision = 0;
 
 	media_device_init(&cio2->media_dev);

drivers/media/platform/renesas/rcar-vin/rcar-core.c

···
 
 	strscpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
 	strscpy(mdev->model, match->compatible, sizeof(mdev->model));
-	snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
-		 dev_name(mdev->dev));
 
 	media_device_init(mdev);
 

drivers/media/platform/renesas/vsp1/vsp1_drv.c

···
 	mdev->dev = vsp1->dev;
 	mdev->hw_revision = vsp1->version;
 	strscpy(mdev->model, vsp1->info->model, sizeof(mdev->model));
-	snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
-		 dev_name(mdev->dev));
 	media_device_init(mdev);
 
 	vsp1->media_ops.link_setup = vsp1_entity_link_setup;

drivers/media/platform/st/stm32/stm32-dcmi.c

···
 
 	/* Initialize media device */
 	strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model));
-	snprintf(dcmi->mdev.bus_info, sizeof(dcmi->mdev.bus_info),
-		 "platform:%s", DRV_NAME);
 	dcmi->mdev.dev = &pdev->dev;
 	media_device_init(&dcmi->mdev);
 

drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c

···
 	strscpy(csi->mdev.model, "Allwinner Video Capture Device",
 		sizeof(csi->mdev.model));
 	csi->mdev.hw_revision = 0;
-	snprintf(csi->mdev.bus_info, sizeof(csi->mdev.bus_info), "platform:%s",
-		 dev_name(csi->dev));
 	media_device_init(&csi->mdev);
 	csi->v4l.mdev = &csi->mdev;
 

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c

···
 	strscpy(csi->media_dev.model, "Allwinner Video Capture Device",
 		sizeof(csi->media_dev.model));
 	csi->media_dev.hw_revision = 0;
-	snprintf(csi->media_dev.bus_info, sizeof(csi->media_dev.bus_info),
-		 "platform:%s", dev_name(csi->dev));
 
 	media_device_init(&csi->media_dev);
 	v4l2_async_nf_init(&csi->notifier);

drivers/media/platform/ti/cal/cal.c

···
 	mdev->dev = cal->dev;
 	mdev->hw_revision = cal->revision;
 	strscpy(mdev->model, "CAL", sizeof(mdev->model));
-	snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
-		 dev_name(mdev->dev));
 	media_device_init(mdev);
 
 	/*

include/media/media-device.h

···
  *
  * - dev must point to the parent device
  * - model must be filled with the device model name
+ *
+ * The bus_info field is set by media_device_init() for PCI and platform devices
+ * if the field begins with '\0'.
  */
 void media_device_init(struct media_device *mdev);
 
···
  *
  * The caller is responsible for initializing the &media_device structure
  * before registration. The following fields of &media_device must be set:
- *
- *  - &media_device.dev must point to the parent device (usually a &pci_dev,
- *    &usb_interface or &platform_device instance).
  *
  *  - &media_device.model must be filled with the device model name as a
  *    NUL-terminated UTF-8 string. The device/model revision must not be