[PATCH v3 13/14] media: imx7.rst: add documentation for i.MX7 media driver
Rui Miguel Silva
rui.silva at linaro.org
Wed May 9 11:08:29 UTC 2018
Hi Randy,
On Tue 08 May 2018 at 17:24, Randy Dunlap wrote:
> Hi,
>
> I have a few editing suggestions below...
Thank you very much for this. I will incorporate this in the next
version.
---
Cheers,
Rui
>
> On 05/07/2018 09:21 AM, Rui Miguel Silva wrote:
>> Add rst document to describe the i.MX7 media driver and also a
>> working example
>> from the Warp7 board usage with a OV2680 sensor.
>>
>> Signed-off-by: Rui Miguel Silva <rui.silva at linaro.org>
>> ---
>> Documentation/media/v4l-drivers/imx7.rst | 157
>> ++++++++++++++++++++++
>> Documentation/media/v4l-drivers/index.rst | 1 +
>> 2 files changed, 158 insertions(+)
>> create mode 100644 Documentation/media/v4l-drivers/imx7.rst
>>
>> diff --git a/Documentation/media/v4l-drivers/imx7.rst
>> b/Documentation/media/v4l-drivers/imx7.rst
>> new file mode 100644
>> index 000000000000..64b97b442277
>> --- /dev/null
>> +++ b/Documentation/media/v4l-drivers/imx7.rst
>> @@ -0,0 +1,157 @@
>> +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
>
> s/,/;/
>
>> +manipulation of the capture frames is less feature rich.
>
> are less
>
>> +
>> +For image capture the i.MX7 have three units:
>
> has
>
>> +- CMOS Sensor Interface (CSI)
>> +- Video Multiplexer
>> +- MIPI CSI-2 Receiver
>> +
>> +::
>> + |\
>> + 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 recevier entity. It has one sink pad to
>> receive the pixel
>
> receiver
>
>> +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 support two D-PHY Rx Data lanes.
>
> supports
>
>> +
>> +csi_mux
>> +-------
>> +
>> +This is the video multiplexer. It has two sink pads to select
>> from either camera
>> +sensors with a parallel interface or from MIPI CSI-2 virtual
>> channel 0. It has
>
> sensor
>
>> +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 interfaces directly with Parallel and MIPI CSI-2 buses. It
>> has 256 x 64 FIFO
>
> interface
>
>> +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 receive from the csi_mux
>> entity and a single
>
> receives
>
>> +source pad that route video frames directly to memory buffers,
>> this pad is
>
> routes
> 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
>
> can start. The
>
>> +the resolutions supported by the sensor.
>> +
>> +.. code-block:: none
>> + root at imx7s-warp:~# media-ctl -p
>> + Media controller API version 4.17.0
>> +
>> + Media device information
>> + ------------------------
>> + driver imx-media
>> + model imx-media
>> + serial
>> + bus info
>> + hw revision 0x0
>> + driver version 4.17.0
>> +
>> + 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]
>> + <- "csi_mux":2 [ENABLED]
>> + pad1: Source
>> + [fmt:SBGGR10_1X10/800x600 field:none]
>> + -> "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:unknown/0x0]
>> + pad1: Sink
>> + [fmt:unknown/800x600 field:none]
>> + <- "imx7-mipi-csis.0":1 [ENABLED]
>> + pad2: Source
>> + [fmt:unknown/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 field:none]
>> + -> "imx7-mipi-csis.0":0 [ENABLED]
>> +
>> +
>> +References
>> +----------
>> +
>> +.. [#f1]
>> https://www.nxp.com/docs/en/reference-manual/IMX7SRM.pdf
>
> thanks.
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