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1 .. SPDX-License-Identifier: GPL-2.0
4 Raspberry Pi PiSP Back End Memory-to-Memory ISP (pisp-be)
10 The PiSP Back End is a memory-to-memory Image Signal Processor (ISP) which reads
13 pixel data back to memory through two distinct output channels.
19 tessellation and the computation of low-level configuration parameters is
24 an image sensor through a MIPI CSI-2 compatible capture interface, storing them
29 The pisp-be driver
32 The Raspberry Pi PiSP Back End (pisp-be) driver is located under
33 drivers/media/platform/raspberrypi/pisp-be. It uses the `V4L2 API` to register
38 The media topology registered by the `pisp-be` driver is represented below:
40 .. _pips-be-topology:
42 .. kernel-figure:: raspberrypi-pisp-be.dot
44     :align: center
49 - pispbe-input: output device for images to be submitted to the ISP for
51 - pispbe-tdn_input: output device for temporal denoise.
52 - pispbe-stitch_input: output device for image stitching (HDR).
53 - pispbe-output0: first capture device for processed images.
54 - pispbe-output1: second capture device for processed images.
55 - pispbe-tdn_output: capture device for temporal denoise.
56 - pispbe-stitch_output: capture device for image stitching (HDR).
57 - pispbe-config: output device for ISP configuration parameters.
59 pispbe-input
60 ------------
62 Images to be processed by the ISP are queued to the `pispbe-input` output device
66 pispbe-tdn_input, pispbe-tdn_output
67 -----------------------------------
69 The `pispbe-tdn_input` output video device receives images to be processed by
70 the temporal denoise block which are captured from the `pispbe-tdn_output`
75 pispbe-stitch_input, pispbe-stitch_output
76 -----------------------------------------
79 tonemapping blocks are used. The `pispbe-stitch_output` writes images to memory
80 and the `pispbe-stitch_input` receives the previously written frame to process
85 pispbe-output0, pispbe-output1
86 ------------------------------
88 The two capture devices write to memory the pixel data as processed by the ISP.
90 pispbe-config
91 -------------
93 The `pispbe-config` output video devices receives a buffer of configuration
109 …n document: https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specific…