The output of mediactl -p after I added overlay for imx219:
Media controller API version 5.10.168
Media device information
------------------------
driver j721e-csi2rx
model TI-CSI2RX
serial
bus info platform:30102000.ticsi2rx
hw revision 0x1
driver version 5.10.168
Device topology
- entity 1: 30102000.ticsi2rx (5 pads, 5 links)
type V4L2 subdev subtype Unknown flags 0
device node name /dev/v4l-subdev0
pad0: Sink
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
<- "cdns_csi2rx.30101000.csi-bridge":1 [ENABLED,IMMUTABLE]
pad1: Source
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
-> "30102000.ticsi2rx context 0":0 [ENABLED,IMMUTABLE]
pad2: Source
-> "30102000.ticsi2rx context 1":0 [ENABLED,IMMUTABLE]
pad3: Source
-> "30102000.ticsi2rx context 2":0 [ENABLED,IMMUTABLE]
pad4: Source
-> "30102000.ticsi2rx context 3":0 [ENABLED,IMMUTABLE]
- entity 7: cdns_csi2rx.30101000.csi-bridge (5 pads, 2 links)
type V4L2 subdev subtype Unknown flags 0
device node name /dev/v4l-subdev1
pad0: Sink
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
<- "imx219 4-0010":0 [ENABLED,IMMUTABLE]
pad1: Source
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
-> "30102000.ticsi2rx":0 [ENABLED,IMMUTABLE]
pad2: Source
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
pad3: Source
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
pad4: Source
[fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
- entity 13: imx219 4-0010 (1 pad, 1 link)
type V4L2 subdev subtype Sensor flags 0
device node name /dev/v4l-subdev2
pad0: Source
[fmt:SRGGB10_1X10/3280x2464 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range
crop.bounds:(8,8)/3280x2464
crop:(8,8)/3280x2464]
-> "cdns_csi2rx.30101000.csi-bridge":0 [ENABLED,IMMUTABLE]
- entity 19: 30102000.ticsi2rx context 0 (1 pad, 1 link)
type Node subtype V4L flags 0
device node name /dev/video0
pad0: Sink
<- "30102000.ticsi2rx":1 [ENABLED,IMMUTABLE]
- entity 25: 30102000.ticsi2rx context 1 (1 pad, 1 link)
type Node subtype V4L flags 0
device node name /dev/video1
pad0: Sink
<- "30102000.ticsi2rx":2 [ENABLED,IMMUTABLE]
- entity 31: 30102000.ticsi2rx context 2 (1 pad, 1 link)
type Node subtype V4L flags 0
device node name /dev/video2
pad0: Sink
<- "30102000.ticsi2rx":3 [ENABLED,IMMUTABLE]
- entity 37: 30102000.ticsi2rx context 3 (1 pad, 1 link)
type Node subtype V4L flags 0
device node name /dev/video3
pad0: Sink
<- "30102000.ticsi2rx":4 [ENABLED,IMMUTABLE]
Both ticsi2rx and csi-bridge subdevices have 4 source media entity pads. I’m trying to figure out how to use CSI-2 Virtual Channels, but I’m a little confused: csi-bridge has one source linked with sink of csi2rx, what are other media entity pads on csi-bridge? Then ticsi2rx have four source pads as well, but only context 0 is set up to image format. Are these contexts equivalent of 4 Virtual Channels CSI-2 supports?