pipeline: rpi: Add support for Raspberry Pi 5

Add the Raspberry Pi 5 ISP (PiSP) pipeline handler to libcamera. To
include this pipeline handler in the build, set the following meson
option:

meson configure -Dpipelines=rpi/pisp

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/pipeline/rpi/pisp/data/example.yaml

@@ -0,0 +1,45 @@
+{
+        "version": 1.0,
+        "target": "pisp",
+
+        "pipeline_handler":
+        {
+                # Number of CFE config and stats buffers to allocate and use. A
+                # larger number minimises the possibility of dropping frames,
+                # but increases the latency for updating the HW configuration.
+                #
+                # "num_cfe_config_stats_buffers": 12,
+
+                # Number of jobs to queue ahead to the CFE on startup. A larger
+                # number will increase latency for 3A changes, but may reduce 
+                # avoidable frame drops.
+                #
+                # "num_cfe_config_queue": 2,
+
+                # Override any request from the IPA to drop a number of startup
+                # frames.
+                #
+                # "disable_startup_frame_drops": false,
+
+                # Custom timeout value (in ms) for camera to use. This overrides
+                # the value computed by the pipeline handler based on frame
+                # durations.
+                #
+                # Set this value to 0 to use the pipeline handler computed
+                # timeout value.
+                #
+                # "camera_timeout_value_ms": 0,
+
+                # Disables temporal denoise functionality in the ISP pipeline.
+                # Disabling temporal denoise avoids allocating 2 additional
+                # Bayer framebuffers required for its operation.
+                #
+                # "disable_tdn": false,
+
+                # Disables multiframe HDR functionality in the ISP pipeline.
+                # Disabling multiframe HDR avoids allocating 2 additional Bayer
+                # framebuffers required for its operation.
+                #
+                # "disable_hdr": false,
+        }
+}

src/libcamera/pipeline/rpi/pisp/data/meson.build

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: CC0-1.0
+
+conf_files = files([
+    'example.yaml',
+])
+
+install_data(conf_files,
+             install_dir : pipeline_data_dir / 'rpi' / 'pisp')

src/libcamera/pipeline/rpi/pisp/meson.build

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libcamera_internal_sources += files([
+    'pisp.cpp',
+])
+
+librt = cc.find_library('rt', required : true)
+libpisp_dep = dependency('libpisp', fallback : ['libpisp', 'libpisp_dep'])
+
+libcamera_deps += [libpisp_dep, librt]
+
+subdir('data')