dt-bindings: display: panel: add LXD M9189A

The LXD M9189A is a 1024x600 MIPI-DSI panel.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260218-drm-panel-ek79007ad3-v4-2-8ec448bf3ede@pengutronix.de

diff --git a/Documentation/devicetree/bindings/display/panel/lxd,m9189a.yaml b/Documentation/devicetree/bindings/display/panel/lxd,m9189a.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/lxd,m9189a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LXD M9189A DSI Display Panel
+
+maintainers:
+  - Michael Tretter <m.tretter@pengutronix.de>
+
+allOf:
+  - $ref: panel-common.yaml
+
+properties:
+  compatible:
+    const: lxd,m9189a
+
+  reg:
+    maxItems: 1
+
+  standby-gpios:
+    description: GPIO used for the standby pin
+    maxItems: 1
+
+  reset-gpios: true
+  power-supply: true
+  backlight: true
+  port: true
+
+required:
+  - compatible
+  - reg
+  - standby-gpios
+  - reset-gpios
+  - power-supply
+  - backlight
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      panel@0 {
+        compatible = "lxd,m9189a";
+        reg = <0>;
+        backlight = <&backlight>;
+        reset-gpios = <&gpio3 25 GPIO_ACTIVE_LOW>;
+        standby-gpios = <&gpio5 22 GPIO_ACTIVE_LOW>;
+        power-supply = <&reg_display_3v3>;
+
+        port {
+          mipi_panel_in: endpoint {
+            remote-endpoint = <&mipi_dsi_out>;
+          };
+        };
+      };
+    };