Linux v4l2架构学习总链接

rv1126 架构如下

这里分析mipi csi

#define CSI2_SINK_PAD			0
#define CSI2_NUM_SINK_PADS		1
#define CSI2_NUM_SRC_PADS		4
#define CSI2_NUM_PADS			5
#define CSI2_NUM_PADS_SINGLE_LINK	2

static int csi2_probe(struct platform_device *pdev)
{
    ...
    csi2->sd.entity.ops = &csi2_entity_ops;
    ...
    csi2_media_init(&csi2->sd);
}

static int csi2_media_init(struct v4l2_subdev *sd)
{
	struct csi2_dev *csi2 = sd_to_dev(sd);
	int i = 0, num_pads = 0;


        /*
         * num_pads = 5
         */


	num_pads = csi2->match_data->num_pads;

	for (i = 0; i < num_pads; i++) {
		csi2->pad[i].flags = (i == CSI2_SINK_PAD) ?
		MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
	}

	csi2->pad[RK_CSI2X_PAD_SOURCE0].flags =
		MEDIA_PAD_FL_SOURCE | MEDIA_PAD_FL_MUST_CONNECT;
	csi2->pad[RK_CSI2_PAD_SINK].flags =
		MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
        ...

        return media_entity_pads_init(&sd->entity, num_pads, csi2->pad);
}

可以看到mipi csi entity有5个pad，1个sink pad，4个source pad

标签：CSI2,csi,num,---,pads,mipi,PAD,pad,csi2
来源： https://blog.csdn.net/ldl617/article/details/115694818