shields: Add EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter

Add EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter.
This is a converter from EK-RA8D1 J57 port to RTK7EKA6M3B00001BU
Display CN1 pin signal.

Signed-off-by: The Nguyen <[email protected]>

Author: thenguyenyf

boards/shields/ek_ra8d1_rtk7eka6m3b00001bu/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_EK_RA8D1_RTK7EKA6M3B00001BU
+	def_bool $(shields_list_contains,ek_ra8d1_rtk7eka6m3b00001bu)

boards/shields/ek_ra8d1_rtk7eka6m3b00001bu/doc/img/bottom.webp

@@ -0,0 +1,46 @@
+.. _ek_ra8d1_rtk7eka6m3b00001bu:
+
+EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter
+##############################################
+
+Overview
+********
+
+The EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter is an open-source hardware converter PCB that
+adapts the EK-RA8D1 Parallel Graphics Expansion Port (J57) to the RTK7EKA6M3B00001BU display
+shield.
+
+.. figure:: img/top.webp
+   :align: center
+   :alt: EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter (top)
+   :width: 300
+
+   EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter (top)
+
+.. figure:: img/bottom.webp
+   :align: center
+   :alt: EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter (bottom)
+   :width: 300
+
+   EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter (bottom)
+
+Programming
+***********
+
+Set ``--shield ek_ra8d1_rtk7eka6m3b00001bu`` when you invoke ``west build``.
+This shield is just a converter, so it is usually used with RTK7EKA6M3B00001BU shield.
+
+For example,
+
+.. zephyr-app-commands::
+   :zephyr-app: tests/drivers/display/display_read_write
+   :board: ek_ra8d1
+   :shield: ek_ra8d1_rtk7eka6m3b00001bu,rtk7eka6m3b00001bu
+   :goals: build
+
+References
+**********
+- `EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter`_
+
+.. _EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter:
+   https://oshpark.com/shared_projects/pzfp0mCD

boards/shields/ek_ra8d1_rtk7eka6m3b00001bu/doc/img/top.webp

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	lcd_expansion_rtk7eka6m3b00001bu: parallel-graphics-connector {
+		compatible = "renesas,ra-parallel-graphics-header";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map = <5 0 &ek_ra8d1_parallel_graphics_expansion 4 0>,	/* IIC_SCL */
+			   <21 0 &ek_ra8d1_parallel_graphics_expansion 2 0>,	/* IIC_SDA */
+			   <35 0 &ek_ra8d1_parallel_graphics_expansion 6 0>,	/* DISP_RST */
+			   <38 0 &ek_ra8d1_parallel_graphics_expansion 3 0>,	/* DISP_INT */
+			   <39 0 &ek_ra8d1_parallel_graphics_expansion 1 0>;	/* DISP_BLEN */
+	};
+};

boards/shields/ek_ra8d1_rtk7eka6m3b00001bu/doc/index.rst

@@ -0,0 +1,6 @@
+shield:
+  name: ek_ra8d1_rtk7eka6m3b00001bu
+  full_name: EK-RA8D1 to RTK7EKA6M3B00001BU Display Adapter
+  vendor: renesas
+  supported_features:
+    - display

boards/shields/ek_ra8d1_rtk7eka6m3b00001bu/ek_ra8d1_rtk7eka6m3b00001bu.overlay

@@ -4,20 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-/ {
-	renesas_parallel_graphics_connector: parallel-graphics-connector {
-		compatible = "renesas,ra-parallel-graphics-header";
-		#gpio-cells = <2>;
-		gpio-map-mask = <0xffffffff 0xffffffc0>;
-		gpio-map-pass-thru = <0 0x3f>;
-		gpio-map =	<1 0 &ioport4 4 0>,	/* DISP_BLEN */
-				<2 0 &ioport5 11 0>,	/* IIC_SDA */
-				<3 0 &ioport5 10 0>,	/* DISP_INT */
-				<4 0 &ioport5 12 0>,	/* IIC_SCL */
-				<6 0 &ioporta 1 0>;	/* DISP_RST */
-	};
-};
-
 &port_irq3 {
 	interrupts = <90 1>;
 	status = "okay";

boards/shields/ek_ra8d1_rtk7eka6m3b00001bu/shield.yml

@@ -15,22 +15,26 @@
 		compatible = "zephyr,lvgl-pointer-input";
 		input = <&ft5336_rtk7eka6m3b00001bu>;
 	};
+
+	lcd_expansion_rtk7eka6m3b00001bu: parallel-graphics-connector {
+		compatible = "renesas,ra-parallel-graphics-header";
+	};
 };
 
 &iic1 {
 	status = "okay";
 	ft5336_rtk7eka6m3b00001bu: ft5336-rtk7eka6m3b00001bu@38 {
 		compatible = "focaltech,ft5336";
 		reg = <0x38>;
-		int-gpios = <&renesas_parallel_graphics_connector 3 GPIO_ACTIVE_HIGH>;
+		int-gpios = <&lcd_expansion_rtk7eka6m3b00001bu 38 GPIO_ACTIVE_HIGH>;
 	};
 };
 
 &zephyr_lcdif {
 	status = "okay";
 	width = <480>;
 	height = <272>;
-	input-pixel-format = <PANEL_PIXEL_FORMAT_RGB_888>;
+	input-pixel-format = <PANEL_PIXEL_FORMAT_RGB_565>;
 	output-pixel-format = <PANEL_PIXEL_FORMAT_RGB_888>;
 	display-timings {
 		compatible = "zephyr,panel-timing";
@@ -45,5 +49,5 @@
 		hfront-porch = <4>;
 		vfront-porch = <35>;
 	};
-	backlight-gpios = <&renesas_parallel_graphics_connector 1 GPIO_ACTIVE_HIGH>;
+	backlight-gpios = <&lcd_expansion_rtk7eka6m3b00001bu 39 GPIO_ACTIVE_HIGH>;
 };