[PATCH] arm64: dts: renesas: Add pixpaper display overlay for RZ/V2H Kakip board

[Wig Cheng <onlywig@gmail.com>]

Add device tree overlay to support the MayQueen PixPaper e-paper display
on the Renesas RZ/V2H EVK (KAKIP board). The display is connected via
SPI0 interface and uses GPIO pins for reset, busy, and DC control.

The overlay configures:
    - RSPI0 pinmux for SPI communication (MOSI, MISO, CLK, CE0)
    - PixPaper display device with proper GPIO assignments
    - SPI frequency set to 1MHz for stable operation

This enables support for the Open-EP Community pixpaper-213-c module on
the RZ/V2H platform.

Signed-off-by: Wig Cheng <onlywig@gmail.com>
---
 arch/arm64/boot/dts/renesas/Makefile          |  3 ++
 .../renesas/r9a09g057h48-kakip-pixpaper.dtso  | 40 +++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index 1fab1b50f20e..d4dfb7fd973b 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -202,6 +202,9 @@ dtb-$(CONFIG_ARCH_R9A09G057) += rzv2-evk-cn15-sd.dtbo
 r9a09g057h44-rzv2h-evk-cn15-sd-dtbs := r9a09g057h44-rzv2h-evk.dtb rzv2-evk-cn15-sd.dtbo
 dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h44-rzv2h-evk-cn15-sd.dtb
 dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip.dtb
+dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip-pixpaper.dtbo
+r9a09g057h48-kakip-pixpaper-dtbs := r9a09g057h48-kakip.dtb r9a09g057h48-kakip-pixpaper.dtbo
+dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip-pixpaper.dtb
 
 dtb-$(CONFIG_ARCH_R9A09G077) += r9a09g077m44-rzt2h-evk.dtb
 
diff --git a/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
new file mode 100644
index 000000000000..e36cfc9227f4
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Overlay for Mayqueen (Open-EP Community) pixpaper display
+ * support on Renesas RZ/V2H platform (KAKIP board).
+ *
+ * Copyright (C) 2026 Wig Cheng <onlywig@gmail.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/pinctrl/renesas,r9a09g057-pinctrl.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+&pinctrl {
+	rspi0_pins: rspi0 {
+		pinmux = <RZV2H_PORT_PINMUX(9, 0, 1)>, /* SPI0 MOSI */
+			 <RZV2H_PORT_PINMUX(9, 1, 1)>, /* SPI0 MISO */
+			 <RZV2H_PORT_PINMUX(9, 2, 1)>, /* SPI0 CLK */
+			 <RZV2H_PORT_PINMUX(9, 3, 1)>; /* SPI0 CE0 */
+	};
+};
+
+&rspi0 {
+	pinctrl-0 = <&rspi0_pins>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	display0: display@0 {
+		compatible = "mayqueen,pixpaper";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		reset-gpios = <&pinctrl RZV2H_GPIO(A, 7) GPIO_ACTIVE_HIGH>;
+		busy-gpios = <&pinctrl RZV2H_GPIO(B, 3) GPIO_ACTIVE_HIGH>;
+		dc-gpios = <&pinctrl RZV2H_GPIO(7, 4) GPIO_ACTIVE_HIGH>;
+	};
+};
-- 
2.43.0