1 .. SPDX-License-Identifier: GPL-2.0
3 i.MX7 Video Capture Driver
4 ==========================
9 The i.MX7 contrary to the i.MX5/6 family does not contain an Image Processing
10 Unit (IPU); because of that the capabilities to perform operations or
11 manipulation of the capture frames are less feature rich.
13 For image capture the i.MX7 has three units:
14 - CMOS Sensor Interface (CSI)
20 MIPI Camera Input ---> MIPI CSI-2 --- > |\
24 | U | ------> CSI ---> Capture
27 Parallel Camera Input ----------------> | /
30 For additional information, please refer to the latest versions of the i.MX7
31 reference manual [#f1]_.
39 This is the MIPI CSI-2 receiver entity. It has one sink pad to receive the pixel
40 data from MIPI CSI-2 camera sensor. It has one source pad, corresponding to the
41 virtual channel 0. This module is compliant to previous version of Samsung
42 D-phy, and supports two D-PHY Rx Data lanes.
47 This is the video multiplexer. It has two sink pads to select from either camera
48 sensor with a parallel interface or from MIPI CSI-2 virtual channel 0. It has
49 a single source pad that routes to the CSI.
54 The CSI enables the chip to connect directly to external CMOS image sensor. CSI
55 can interface directly with Parallel and MIPI CSI-2 buses. It has 256 x 64 FIFO
56 to store received image pixel data and embedded DMA controllers to transfer data
57 from the FIFO through AHB bus.
59 This entity has one sink pad that receives from the csi-mux entity and a single
60 source pad that routes video frames directly to memory buffers. This pad is
61 routed to a capture device node.
66 To aid in configuration and for backward compatibility with V4L2 applications
67 that access controls only from video device nodes, the capture device interfaces
68 inherit controls from the active entities in the current pipeline, so controls
69 can be accessed either directly from the subdev or from the active capture
70 device interface. For example, the sensor controls are available either from the
71 sensor subdevs or from the active capture device.
76 On this platform an OV2680 MIPI CSI-2 module is connected to the internal MIPI
77 CSI-2 receiver. The following example configures a video capture pipeline with
78 an output of 800x600, and BGGR 10 bit bayer format:
83 media-ctl -l "'ov2680 1-0036':0 -> 'imx7-mipi-csis.0':0[1]"
84 media-ctl -l "'imx7-mipi-csis.0':1 -> 'csi-mux':1[1]"
85 media-ctl -l "'csi-mux':2 -> 'csi':0[1]"
86 media-ctl -l "'csi':1 -> 'csi capture':0[1]"
88 # Configure pads for pipeline
89 media-ctl -V "'ov2680 1-0036':0 [fmt:SBGGR10_1X10/800x600 field:none]"
90 media-ctl -V "'csi-mux':1 [fmt:SBGGR10_1X10/800x600 field:none]"
91 media-ctl -V "'csi-mux':2 [fmt:SBGGR10_1X10/800x600 field:none]"
92 media-ctl -V "'imx7-mipi-csis.0':0 [fmt:SBGGR10_1X10/800x600 field:none]"
93 media-ctl -V "'csi':0 [fmt:SBGGR10_1X10/800x600 field:none]"
95 After this streaming can start. The v4l2-ctl tool can be used to select any of
96 the resolutions supported by the sensor.
101 Media controller API version 5.2.0
103 Media device information
104 ------------------------
113 - entity 1: csi (2 pads, 2 links)
114 type V4L2 subdev subtype Unknown flags 0
115 device node name /dev/v4l-subdev0
117 [fmt:SBGGR10_1X10/800x600 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
118 <- "csi-mux":2 [ENABLED]
120 [fmt:SBGGR10_1X10/800x600 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
121 -> "csi capture":0 [ENABLED]
123 - entity 4: csi capture (1 pad, 1 link)
124 type Node subtype V4L flags 0
125 device node name /dev/video0
129 - entity 10: csi-mux (3 pads, 2 links)
130 type V4L2 subdev subtype Unknown flags 0
131 device node name /dev/v4l-subdev1
133 [fmt:Y8_1X8/1x1 field:none]
135 [fmt:SBGGR10_1X10/800x600 field:none]
136 <- "imx7-mipi-csis.0":1 [ENABLED]
138 [fmt:SBGGR10_1X10/800x600 field:none]
141 - entity 14: imx7-mipi-csis.0 (2 pads, 2 links)
142 type V4L2 subdev subtype Unknown flags 0
143 device node name /dev/v4l-subdev2
145 [fmt:SBGGR10_1X10/800x600 field:none]
146 <- "ov2680 1-0036":0 [ENABLED]
148 [fmt:SBGGR10_1X10/800x600 field:none]
149 -> "csi-mux":1 [ENABLED]
151 - entity 17: ov2680 1-0036 (1 pad, 1 link)
152 type V4L2 subdev subtype Sensor flags 0
153 device node name /dev/v4l-subdev3
155 [fmt:SBGGR10_1X10/800x600@1/30 field:none colorspace:srgb]
156 -> "imx7-mipi-csis.0":0 [ENABLED]
161 .. [#f1] https://www.nxp.com/docs/en/reference-manual/IMX7SRM.pdf