arm64: dts: qcom: x1e80100-denali-oled: enable front camera

[ooaklee]

Summary

• describe the Sony IMX681 front camera on the Surface Pro 11 OLED CCI1 I2C bus
• add its MCLK4, reset, analog and I/O supplies, and privacy-indicator wiring
• route the one-trio C-PHY endpoint through CSIPHY2 at the validated 1.203 GHz V4L2 link frequency
• enable the required CAMSS, CCI1, and CSIPHY2 blocks only in the Denali OLED board file

Dependency and status

This PR is intended to target jg/ubuntu-qcom-x1e-7.2.y directly. Review it after #82, #83, and both preceding camera topics:

• IMX681 sensor prerequisite: media: i2c: add Sony IMX681 sensor support #85
• X1E80100 C-PHY prerequisite: media: qcom: add X1E80100 C-PHY camera receive support #86

The head is stacked on x/sp11-camera-cphy, which is itself stacked on x/sp11-camera-imx681, so the GitHub diff is cumulative until both prerequisite topics are merged into the release branch. The board-graph-specific portion is the single commit after f8ef631fcdd4. It does not merge the broad -sp11 staging branch or replay the correction already merged through #81.

This PR is a draft. It completes the minimum cumulative path needed to exercise the split camera stack, but the exact branches still require the hardware checks below.

Containment

• the incremental diff changes only x1e80100-microsoft-denali-oled.dts
• it does not change the common Denali include, the X1P Surface Pro 11 description, or any non-Denali board
• it enables only the front IMX681 path through CCI1 I2C bus 1, CSIPHY2, and CAMSS
• the endpoint is fixed to one C-PHY trio on lane/trio 0 at the 1.203 GHz V4L2 link frequency
• the board wiring is limited to MCLK4, reset GPIO 237, 2.8 V analog supply, 1.8 V I/O supply, and privacy-indicator GPIO 225
• no rear/IR camera, shared-driver experiment, CCS change, VFE write-mode change, crop/drop engine, or diagnostic ABI is included
• privacy-indicator polarity remains explicitly marked for hardware validation

Provenance

The Denali graph commit is authored by Leon Silcott, carries the authorized Signed-off-by: Leon Silcott <leon@boasi.io>, and preserves its source link to the final integration state in d915d679423e.

The graph and receiver topology derive from @turbineBMW's public camera review patch at immutable revision 05e5335bc724. @turbineBMW is explicitly credited, but no Signed-off-by or Co-authored-by trailer is attributed because the referenced source did not provide one for this rewritten commit.

Validation

• git diff --check f8ef631fcdd4..HEAD for the incremental Denali graph topic
• strict checkpatch for the board commit: no errors, warnings, or checks
• DT binding/schema validation for the IMX681 binding used by the graph
• qcom/x1e80100-microsoft-denali-oled.dtb builds successfully
• selected CHECK_DTBS=y validation for the changed graph is clean; full-tree checking reports only pre-existing warnings outside this topic
• inspection of the compiled DTB confirms C-PHY bus type, trio/lane 0, the 1.203 GHz link frequency, CSIPHY2 routing, supplies, reset, clock, and privacy-indicator references
• the incremental diff contains no shared-driver or non-Denali DT change

Hardware checks still required

• boot this exact cumulative branch on an X1E Surface Pro 11 OLED
• verify IMX681 identification and the complete sensor-to-CSIPHY2-to-CSID0-to-VFE0 media graph
• verify repeated and continuous 3840x2640 RAW10 capture at approximately 30 frames per second without CSID ECC/CRC or VFE transport errors
• verify exposure/gain response, repeated stream start/stop, suspend/resume, and camera reopen
• verify privacy-indicator polarity and that the indicator follows camera use
• run a camera stream smoke test on a non-SP11 X1E D-PHY device because the cumulative prerequisite changes shared PHY/CAMSS code
• confirm the X1P Surface Pro 11 and other non-OLED/non-Denali device trees gain no camera node from this board-only commit