sunxi-csi: fill in bus_info of media device

This fixes a v4l2-compliance warning:

Required ioctls:
                warn: v4l2-test-media.cpp(52): empty bus_info
        test MEDIA_IOC_DEVICE_INFO: OK
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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

@@ -191,6 +191,8 @@ static int sun4i_csi_probe(struct platform_device *pdev)
 	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

@@ -733,6 +733,8 @@ static int sun6i_csi_v4l2_init(struct sun6i_csi *csi)
 	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_notifier_init(&csi->notifier);