Claude review: Add Lontiun LT7911EXC eDP to MIPI DSI bridge

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Overall Series Review

Subject: Add Lontiun LT7911EXC eDP to MIPI DSI bridge
Author: syyang@lontium.com
Patches: 6
Reviewed: 2026-05-05T11:58:22.547291

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This is a v3 patch series adding a new DRM bridge driver for the Lontium LT7911EXC, an eDP-to-MIPI-DSI bridge. The series is two patches: a DT binding and the driver implementation.

The driver has several significant issues that need to be addressed before it's ready for merge:

1. **The bridge is functionally incomplete** — it has no MIPI DSI host/device setup, no mode validation, no `atomic_enable`, and no display configuration. As-is, the driver only handles power sequencing and firmware updates but cannot actually drive a display.
2. **Missing atomic state helpers** — the `drm_bridge_funcs` uses `atomic_*` callbacks but doesn't provide `atomic_duplicate_state` / `atomic_destroy_state` / `atomic_reset`, which are required for correct atomic operation.
3. **The DT binding has swapped port descriptions** relative to both the example and the driver's port usage.
4. **Regulators are left enabled after probe** and never disabled until the first `atomic_post_disable`, wasting power.

The firmware upgrade code is reasonably structured but has error-handling gaps and a few correctness issues.

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