v4l2_subdev_init(sd, &ops);//初始化v4l2_subdev//v4l2_i2c_subdev_init,对于i2c client设备,可以调用该函数media_entity_pads_init(&sd->entity, npads, pads);//假如子设备还作为media_entity, 有用media前后级联,还需调用media_entity_pads_initmedia_entity_pads_init(&sd->entity,1, isp_sdev->pad...