dt-bindings: display: panel: Add Himax HX83121A

HX83121A is a driver IC used to drive MIPI-DSI panels. It is found
in HUAWEI Matebook E Go series (Gaokun2/3) with BOE or CSOT panels.

Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260316084040.728106-2-mitltlatltl@gmail.com

diff --git a/Documentation/devicetree/bindings/display/panel/himax,hx83121a.yaml b/Documentation/devicetree/bindings/display/panel/himax,hx83121a.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/himax,hx83121a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Himax HX83121A based DSI display Panels
+
+maintainers:
+  - Pengyu Luo <mitltlatltl@gmail.com>
+
+description:
+  The Himax HX83121A is a generic DSI Panel IC used to drive dsi
+  panels. Support video mode panels from China Star Optoelectronics
+  Technology (CSOT) and BOE Technology.
+
+allOf:
+  - $ref: panel-common-dual.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - boe,ppc357db1-4
+          - csot,ppc357db1-4
+      - const: himax,hx83121a
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  avdd-supply:
+    description: analog positive supply for IC
+
+  avee-supply:
+    description: analog negative supply for IC
+
+  vddi-supply:
+    description: power supply for IC
+
+  backlight: true
+  ports: true
+
+required:
+  - compatible
+  - reg
+  - vddi-supply
+  - reset-gpios
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "csot,ppc357db1-4", "himax,hx83121a";
+            reg = <0>;
+
+            vddi-supply = <&vreg_l2b>;
+            reset-gpios = <&tlmm 38 GPIO_ACTIVE_LOW>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    panel_in_0: endpoint {
+                        remote-endpoint = <&dsi0_out>;
+                    };
+                };
+
+                port@1{
+                    reg = <1>;
+                    panel_in_1: endpoint {
+                        remote-endpoint = <&dsi1_out>;
+                    };
+                };
+            };
+        };
+    };
+
+...