Claude review: drm/mipi-dsi: Add flag to support dual-panel configurations

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Concept**: Adds a `bool dual_panel` to `struct mipi_dsi_device` so a panel driver can signal the DSI host that it's part of a dual-panel setup.

**Issues:**

1. **Generic name, MSM-specific semantics**: The field is added to the core DRM MIPI DSI header (`include/drm/drm_mipi_dsi.h`), making it part of the cross-driver API. However, only the MSM DSI host consumes it. The commit message describes very MSM-specific behavior (bonded-DSI, shared clock from DSI0 PHY). Other DSI host drivers won't understand this flag. If the intent is for this to be a generic DRM concept, the semantics need proper documentation and potentially discussion on dri-devel about what "dual_panel" means generically vs. bonded DSI.

2. **No documentation of expected behavior**: The field lacks a kerneldoc description of what a host driver should *do* when it sees this flag set. The commit message talks about halving horizontal timings, but that's buried in the cover letter and patch 3, not in the header.

3. **Name ambiguity**: `dual_panel` could mean many things — two panels on different CRTCs, a dual-scan panel, etc. Something like `bonded_panel` or `is_bonded_dsi_panel` would be clearer about the intended semantics.

---
Generated by Claude Code Patch Reviewer