Claude review: drm/bridge: fsl-ldb: support downstream bridges in addition to panels

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

Patch Review

**Correctness: Good**

The core logic is correct. `devm_drm_of_get_bridge()` internally calls `drm_of_find_panel_or_bridge()`, and if a panel is found, wraps it with `devm_drm_panel_bridge_add()` — so existing panel-only device trees continue to work unchanged. If a bridge is found, it's returned directly. Either way the result is a `struct drm_bridge *`, which is exactly what `fsl_ldb->panel_bridge` stores and what `fsl_ldb_attach()` passes to `drm_bridge_attach()`.

**Port selection logic: Correct**

```c
fsl_ldb->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node,
                                                fsl_ldb->ch0_enabled ? 1 : 2, 0);
```

This correctly mirrors the original logic:
```c
panel_node = of_node_get(remote1 ? remote1 : remote2);
```
where `remote1` is from port 1 and `remote2` is from port 2. In the dual-link case (both channels enabled), both ports connect to the same downstream device, so picking port 1 is correct.

**Nit 1: Stale error message**

```c
if (!fsl_ldb->ch0_enabled && !fsl_ldb->ch1_enabled)
    return dev_err_probe(dev, -ENXIO, "No panel node found");
```

Since the driver now supports bridges too, this message should say something like `"No panel or bridge node found"` or simply `"No remote node found"`.

**Nit 2: Unused include**

After this patch, nothing in the file uses `struct drm_panel`, `of_drm_find_panel()`, or any other symbol from `<drm/drm_panel.h>`. The include at the top of the file could be dropped since `devm_drm_of_get_bridge()` is declared in `<drm/drm_bridge.h>` (already included).

**Nit 3: Needs rebase**

The patch is based on tree state `5c3cf37200bc`, but current drm-next has additional code between the removed `of_node_put(panel_node)` and `devm_drm_panel_bridge_add()` calls — specifically the `nxp,enable-termination-resistor` property check at `fsl-ldb.c:347-348`. The patch will need a trivial rebase to resolve this context conflict. The `nxp,enable-termination-resistor` block should remain in place after the rebase.

**Non-issue (for context):** The struct member `panel_bridge` is now slightly misnamed since it can hold a non-panel bridge, but renaming it would be gratuitous churn and is fine to leave.

---
Generated by Claude Code Patch Reviewer