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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-03 20:59:38 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-03 20:59:38 -0700 |
commit | a98f670e41a99f53acb1fb33cee9c6abbb2e6f23 (patch) | |
tree | f8ae10a4cb91758ad7f9422053753a8c5d0f04dc /Documentation/admin-guide/media/imx7.rst | |
parent | ee01c4d72adffb7d424535adf630f2955748fa8b (diff) | |
parent | 938b29db3aa9c293c7c1366b16e55e308f1a1ddd (diff) |
Merge tag 'media/v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
- Media documentation is now split into admin-guide, driver-api and
userspace-api books (a longstanding request from Jon);
- The media Kconfig was reorganized, in order to make easier to select
drivers and their dependencies;
- The testing drivers now has a separate directory;
- added a new driver for Rockchip Video Decoder IP;
- The atomisp staging driver was resurrected. It is meant to work with
4 generations of cameras on Atom-based laptops, tablets and cell
phones. So, it seems worth investing time to cleanup this driver and
making it in good shape.
- Added some V4L2 core ancillary routines to help with h264 codecs;
- Added an ov2740 image sensor driver;
- The si2157 gained support for Analog TV, which, in turn, added
support for some cx231xx and cx23885 boards to also support analog
standards;
- Added some V4L2 controls (V4L2_CID_CAMERA_ORIENTATION and
V4L2_CID_CAMERA_SENSOR_ROTATION) to help identifying where the camera
is located at the device;
- VIDIOC_ENUM_FMT was extended to support MC-centric devices;
- Lots of drivers improvements and cleanups.
* tag 'media/v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (503 commits)
media: Documentation: media: Refer to mbus format documentation from CSI-2 docs
media: s5k5baf: Replace zero-length array with flexible-array
media: i2c: imx219: Drop <linux/clk-provider.h> and <linux/clkdev.h>
media: i2c: Add ov2740 image sensor driver
media: ov8856: Implement sensor module revision identification
media: ov8856: Add devicetree support
media: dt-bindings: ov8856: Document YAML bindings
media: dvb-usb: Add Cinergy S2 PCIe Dual Port support
media: dvbdev: Fix tuner->demod media controller link
media: dt-bindings: phy: phy-rockchip-dphy-rx0: move rockchip dphy rx0 bindings out of staging
media: staging: dt-bindings: phy-rockchip-dphy-rx0: remove non-used reg property
media: atomisp: unify the version for isp2401 a0 and b0 versions
media: atomisp: update TODO with the current data
media: atomisp: adjust some code at sh_css that could be broken
media: atomisp: don't produce errs for ignored IRQs
media: atomisp: print IRQ when debugging
media: atomisp: isp_mmu: don't use kmem_cache
media: atomisp: add a notice about possible leak resources
media: atomisp: disable the dynamic and reserved pools
media: atomisp: turn on camera before setting it
...
Diffstat (limited to 'Documentation/admin-guide/media/imx7.rst')
-rw-r--r-- | Documentation/admin-guide/media/imx7.rst | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/Documentation/admin-guide/media/imx7.rst b/Documentation/admin-guide/media/imx7.rst new file mode 100644 index 000000000000..1e442c97da47 --- /dev/null +++ b/Documentation/admin-guide/media/imx7.rst @@ -0,0 +1,161 @@ +.. SPDX-License-Identifier: GPL-2.0 + +i.MX7 Video Capture Driver +========================== + +Introduction +------------ + +The i.MX7 contrary to the i.MX5/6 family does not contain an Image Processing +Unit (IPU); because of that the capabilities to perform operations or +manipulation of the capture frames are less feature rich. + +For image capture the i.MX7 has three units: +- CMOS Sensor Interface (CSI) +- Video Multiplexer +- MIPI CSI-2 Receiver + +.. code-block:: none + + MIPI Camera Input ---> MIPI CSI-2 --- > |\ + | \ + | \ + | M | + | U | ------> CSI ---> Capture + | X | + | / + Parallel Camera Input ----------------> | / + |/ + +For additional information, please refer to the latest versions of the i.MX7 +reference manual [#f1]_. + +Entities +-------- + +imx7-mipi-csi2 +-------------- + +This is the MIPI CSI-2 receiver entity. It has one sink pad to receive the pixel +data from MIPI CSI-2 camera sensor. It has one source pad, corresponding to the +virtual channel 0. This module is compliant to previous version of Samsung +D-phy, and supports two D-PHY Rx Data lanes. + +csi-mux +------- + +This is the video multiplexer. It has two sink pads to select from either camera +sensor with a parallel interface or from MIPI CSI-2 virtual channel 0. It has +a single source pad that routes to the CSI. + +csi +--- + +The CSI enables the chip to connect directly to external CMOS image sensor. CSI +can interface directly with Parallel and MIPI CSI-2 buses. It has 256 x 64 FIFO +to store received image pixel data and embedded DMA controllers to transfer data +from the FIFO through AHB bus. + +This entity has one sink pad that receives from the csi-mux entity and a single +source pad that routes video frames directly to memory buffers. This pad is +routed to a capture device node. + +Usage Notes +----------- + +To aid in configuration and for backward compatibility with V4L2 applications +that access controls only from video device nodes, the capture device interfaces +inherit controls from the active entities in the current pipeline, so controls +can be accessed either directly from the subdev or from the active capture +device interface. For example, the sensor controls are available either from the +sensor subdevs or from the active capture device. + +Warp7 with OV2680 +----------------- + +On this platform an OV2680 MIPI CSI-2 module is connected to the internal MIPI +CSI-2 receiver. The following example configures a video capture pipeline with +an output of 800x600, and BGGR 10 bit bayer format: + +.. code-block:: none + + # Setup links + media-ctl -l "'ov2680 1-0036':0 -> 'imx7-mipi-csis.0':0[1]" + media-ctl -l "'imx7-mipi-csis.0':1 -> 'csi-mux':1[1]" + media-ctl -l "'csi-mux':2 -> 'csi':0[1]" + media-ctl -l "'csi':1 -> 'csi capture':0[1]" + + # Configure pads for pipeline + media-ctl -V "'ov2680 1-0036':0 [fmt:SBGGR10_1X10/800x600 field:none]" + media-ctl -V "'csi-mux':1 [fmt:SBGGR10_1X10/800x600 field:none]" + media-ctl -V "'csi-mux':2 [fmt:SBGGR10_1X10/800x600 field:none]" + media-ctl -V "'imx7-mipi-csis.0':0 [fmt:SBGGR10_1X10/800x600 field:none]" + media-ctl -V "'csi':0 [fmt:SBGGR10_1X10/800x600 field:none]" + +After this streaming can start. The v4l2-ctl tool can be used to select any of +the resolutions supported by the sensor. + +.. code-block:: none + + # media-ctl -p + Media controller API version 5.2.0 + + Media device information + ------------------------ + driver imx7-csi + model imx-media + serial + bus info + hw revision 0x0 + driver version 5.2.0 + + Device topology + - entity 1: csi (2 pads, 2 links) + type V4L2 subdev subtype Unknown flags 0 + device node name /dev/v4l-subdev0 + pad0: Sink + [fmt:SBGGR10_1X10/800x600 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range] + <- "csi-mux":2 [ENABLED] + pad1: Source + [fmt:SBGGR10_1X10/800x600 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range] + -> "csi capture":0 [ENABLED] + + - entity 4: csi capture (1 pad, 1 link) + type Node subtype V4L flags 0 + device node name /dev/video0 + pad0: Sink + <- "csi":1 [ENABLED] + + - entity 10: csi-mux (3 pads, 2 links) + type V4L2 subdev subtype Unknown flags 0 + device node name /dev/v4l-subdev1 + pad0: Sink + [fmt:Y8_1X8/1x1 field:none] + pad1: Sink + [fmt:SBGGR10_1X10/800x600 field:none] + <- "imx7-mipi-csis.0":1 [ENABLED] + pad2: Source + [fmt:SBGGR10_1X10/800x600 field:none] + -> "csi":0 [ENABLED] + + - entity 14: imx7-mipi-csis.0 (2 pads, 2 links) + type V4L2 subdev subtype Unknown flags 0 + device node name /dev/v4l-subdev2 + pad0: Sink + [fmt:SBGGR10_1X10/800x600 field:none] + <- "ov2680 1-0036":0 [ENABLED] + pad1: Source + [fmt:SBGGR10_1X10/800x600 field:none] + -> "csi-mux":1 [ENABLED] + + - entity 17: ov2680 1-0036 (1 pad, 1 link) + type V4L2 subdev subtype Sensor flags 0 + device node name /dev/v4l-subdev3 + pad0: Source + [fmt:SBGGR10_1X10/800x600@1/30 field:none colorspace:srgb] + -> "imx7-mipi-csis.0":0 [ENABLED] + +References +---------- + +.. [#f1] https://www.nxp.com/docs/en/reference-manual/IMX7SRM.pdf |