Claude review: dt-bindings: display: panel: Add Himax HX83121A

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

Patch Review

The binding looks mostly well-structured but has several issues:

**Missing `allOf` reference to `panel-common.yaml`:**

The binding uses `backlight: true` and `unevaluatedProperties: false`, which implies it should reference the common panel schema. Other himax panel bindings (e.g., `himax,hx83102.yaml`) include:
```yaml
allOf:
  - $ref: panel-common.yaml#
```
Without this, the `ports` property used in the example would fail validation against `unevaluatedProperties: false`, since `ports` is not defined in this schema — it comes from `panel-common.yaml`.

**Missing `port` / `ports` property:**

The example uses a `ports` node with two ports (for dual-DSI), but the schema doesn't declare a `ports` property. This should be added, or inherited via `panel-common.yaml`.

**Missing space in example:**

```yaml
+                port@1{
```
Should be `port@1 {` (space before brace) per DT style convention.

**`avdd-supply` and `avee-supply` naming:**

The binding defines:
```yaml
+  avdd-supply:
+    description: analog positive supply for IC
+
+  avee-supply:
+    description: analog negative supply for IC
```
But the driver code uses `vsp` and `vsn` as supply names:
```c
static const struct regulator_bulk_data himax_supplies[] = {
	{ .supply = "vddi" },
	{ .supply = "vsp" },
	{ .supply = "vsn" },
};
```
The regulator framework maps the code's supply name + `-supply` suffix to the DT property. So the driver would look for `vsp-supply` and `vsn-supply` in DT, **not** `avdd-supply` and `avee-supply`. These must be consistent. Either rename the binding properties to `vsp-supply`/`vsn-supply` or change the driver code to use `avdd`/`avee`.

**`avdd-supply` and `avee-supply` should probably be required:**

If the panel needs these supplies to function, they should be listed in `required:`. Currently only `vddi-supply` and `reset-gpios` are required.

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Generated by Claude Code Patch Reviewer