devices: add CP Plus CP-UNC-TA21L2C (gk7205v200_lite, SC223A)#106
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Dahua-OEM 2 MP camera. The SC223A is on hardware I2C0 routed to the VI-RAW pads (0x112c0060/0x64 func2) rather than the default mipi-sensor pads (0x30/0x34 func1) the SDK probes, and needs a 27 MHz MCLK (0x120100f0=0x19; SDK default 0x11/div4 leaves it unresponsive). S71devmem re-muxes the pads, selects the SENSOR_RSTN reset (GPIO8_7 func2) and fixes MCLK after S70vendor/load_goke; the stock open_sensor_i2c then reaches the sensor over /dev/i2c-0. No kernel module needed. Verified on hardware: chip-id 0xcb3e over HW I2C0, MIPI lock 1920x1080 zero errors, majestic streams correct colour 1080p. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds a device profile for the CP Plus CP-UNC-TA21L2C — a Dahua-OEM 2 MP
full-colour camera on a Goke gk7205v200 (lite) with a SmartSens SC223A
(chip-id
0xcb3e), 16 MiB SPI-NOR, wired-only.Board specifics
On this board the SC223A is on the SoC's hardware I2C0, but routed to the
VI-RAW pads (
0x112c0060/0x64, func2) instead of the default mipi-sensorpads (
0x112c0030/0x34, func1) that the SDKboard=demobring-up probes — sothe stock probe never ACKs. It also needs a 27 MHz MCLK (
0x120100f0 = 0x19,div6); the SDK default
0x11(div4) leaves the sensor unresponsive.general/overlay/etc/init.d/S71devmemhandles both: it runs afterS70vendor(load_goke) and beforeS95majestic, re-muxing I2C0 to theVI-RAW pads, selecting the
SENSOR_RSTNreset (GPIO8_7, func2) and fixingthe MCLK. With that, the stock
open_sensor_i2creaches the sensor over/dev/i2c-0— no kernel module required. (load_gokealready muxesSENSOR_CLKto func1, and majestic does not disturb the MCLK.)Verified on hardware
0xcb3eread over hardware I2C0 (i2ctransfer -y 0 w2@0x30 0x31 0x07 r1→0xcb)majesticstreams correct-colour 1080p (Smart SC223A_1080P_30FPS_10BIT_LINE_Init_OK!, RTSP up)S70vendor → S71devmem → S95majesticwas reproduced and confirmed end-to-endContext
This started as a buildroot package in OpenIPC/firmware (PR
OpenIPC/firmware#2206, now closed). Per @widgetii's review there — both that
these pads are hardware I2C0 rather than a bit-bang bus, and that
board-specific pinmux belongs in this repo — the work is reworked into a device
profile here, with the kernel module dropped in favour of the pinmux above.
TODO (follow-ups)