dt-bindings: display: convert himax,hx8357d.txt to yaml format

Convert himax,hx8357d.txt to yaml format.

Additional changes:
- add spi parent node in examples.
- ref to spi-peripheral-props.yaml.
- change himax,hx8357a to himax,hx8357 to align driver and existed dts.
- add himax,hx8369a and fallback to himax,hx8369.
- allow spi-cpha and spi-cpol to align existed dts.
- add im-gpios for interface selections.
- add reset-gpios.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250602152814.949671-1-Frank.Li@nxp.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: nxpfrankli

Documentation/devicetree/bindings/display/himax,hx8357.yaml

@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/himax,hx8357.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Himax HX8357D display panel
+
+description:
+  Display panels using a Himax HX8357D controller in SPI
+  mode, such as the Adafruit 3.5" TFT for Raspberry Pi.
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - adafruit,yx350hv15
+              - himax,hx8357b
+          - const: himax,hx8357
+      - items:
+          - enum:
+              - himax,hx8369a
+          - const: himax,hx8369
+
+  reg:
+    maxItems: 1
+
+  dc-gpios:
+    maxItems: 1
+    description: D/C pin
+
+  rotation:
+    enum: [0, 90, 180, 270]
+
+  backlight:
+    description:
+      phandle of the backlight device attached to the panel
+
+  im-gpios:
+    maxItems: 3
+
+  reset-gpios:
+    maxItems: 1
+
+  spi-cpha: true
+
+  spi-cpol: true
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display@0 {
+            compatible = "adafruit,yx350hv15", "himax,hx8357";
+            reg = <0>;
+            spi-max-frequency = <32000000>;
+            dc-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
+            rotation = <90>;
+            backlight = <&backlight>;
+       };
+    };

Documentation/devicetree/bindings/display/himax,hx8357d.txt

@@ -7532,7 +7532,7 @@ F:	drivers/gpu/drm/panel/panel-himax-hx8394.c
 DRM DRIVER FOR HX8357D PANELS
 S:	Orphan
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
-F:	Documentation/devicetree/bindings/display/himax,hx8357d.txt
+F:	Documentation/devicetree/bindings/display/himax,hx8357.yaml
 F:	drivers/gpu/drm/tiny/hx8357d.c
 
 DRM DRIVER FOR HYPERV SYNTHETIC VIDEO DEVICE