arm64: dts: renesas: r9a09g057h48-kakip: Add pixpaper display overlay

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>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260124163611.3279104-1-onlywig@gmail.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index 1fab1b50f20e6712d107463efabd19a708aff156..d4dfb7fd973bf9f75e3188471fe1791ad5649bad 100644 (file)
--- 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 (file)
index 0000000..7b82094
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
@@ -0,0 +1,39 @@
+// 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>
+
+&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";
+
+       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>;
+       };
+};