[PATCH v2] arm64: dts: renesas: r8a779g3: Add RPi Display 2 DTO to Retronix R-Car V4H Sparrow Hawk

Marek Vasut marek.vasut+renesas at mailbox.org
Thu Sep 4 13:28:06 PDT 2025 

Add DT overlay to bind RPi Display 2, both 5" and 7" variant, on
Retronix R-Car V4H Sparrow Hawk board. All of display output, the
touch controller, and backlight control have been tested.

Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
---
Cc: Conor Dooley <conor+dt at kernel.org>
Cc: Geert Uytterhoeven <geert+renesas at glider.be>
Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
Cc: Magnus Damm <magnus.damm at gmail.com>
Cc: Rob Herring <robh at kernel.org>
Cc: devicetree at vger.kernel.org
Cc: linux-renesas-soc at vger.kernel.org
---
V2: Build also the plain DTBO for each DTO. Each new DTO entry in the
    Makefile has three lines, the DTBO, combined and DTB targets. This
    is easy to miss, so note this down for myself.
---
 arch/arm64/boot/dts/renesas/Makefile          |  6 ++
 ...a779g3-sparrow-hawk-rpi-display-2-5in.dtso | 13 +++
 ...a779g3-sparrow-hawk-rpi-display-2-7in.dtso | 13 +++
 .../r8a779g3-sparrow-hawk-rpi-display-2.dtsi  | 90 +++++++++++++++++++
 4 files changed, 122 insertions(+)
 create mode 100644 arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-5in.dtso
 create mode 100644 arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-7in.dtso
 create mode 100644 arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2.dtsi

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index d8c9237624664..bef624636d58b 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -99,6 +99,12 @@ dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk.dtb
 dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-pwm.dtbo
 r8a779g3-sparrow-hawk-fan-pwm-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-fan-pwm.dtbo
 dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-pwm.dtb
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-5in.dtbo
+r8a779g3-sparrow-hawk-rpi-display-2-5in-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-rpi-display-2-5in.dtbo
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-5in.dtb
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-7in.dtbo
+r8a779g3-sparrow-hawk-rpi-display-2-7in-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-rpi-display-2-7in.dtbo
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-7in.dtb
 
 dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-white-hawk-single.dtb
 r8a779g3-white-hawk-single-ard-audio-da7212-dtbs := r8a779g3-white-hawk-single.dtb white-hawk-ard-audio-da7212.dtbo
diff --git a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-5in.dtso b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-5in.dtso
new file mode 100644
index 0000000000000..bf7b531ae9d9b
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-5in.dtso
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Overlay for the RPi Display 2 5" MIPI DSI panel connected
+ * to J4:DSI on R-Car V4H ES3.0 Sparrow Hawk board
+ *
+ * Copyright (C) 2025 Marek Vasut <marek.vasut+renesas at mailbox.org>
+ */
+
+#include "r8a779g3-sparrow-hawk-rpi-display-2.dtsi"
+
+&panel {
+	compatible = "raspberrypi,dsi-5inch", "ilitek,ili9881c";
+};
diff --git a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-7in.dtso b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-7in.dtso
new file mode 100644
index 0000000000000..6ec47f213c0ff
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2-7in.dtso
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Overlay for the RPi Display 2 7" MIPI DSI panel connected
+ * to J4:DSI on R-Car V4H ES3.0 Sparrow Hawk board
+ *
+ * Copyright (C) 2025 Marek Vasut <marek.vasut+renesas at mailbox.org>
+ */
+
+#include "r8a779g3-sparrow-hawk-rpi-display-2.dtsi"
+
+&panel {
+	compatible = "raspberrypi,dsi-7inch", "ilitek,ili9881c";
+};
diff --git a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2.dtsi b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2.dtsi
new file mode 100644
index 0000000000000..733333b85a9d2
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-rpi-display-2.dtsi
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Overlay for the RPi Display 2 MIPI DSI panel connected
+ * to J4:DSI on R-Car V4H ES3.0 Sparrow Hawk board
+ *
+ * Copyright (C) 2025 Marek Vasut <marek.vasut+renesas at mailbox.org>
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&{/} {
+	display_bl: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&mcu 0 255 0>;
+	};
+
+	reg_display: regulator-display {
+		compatible = "regulator-fixed";
+		regulator-name = "rpi-display";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
+
+	reg_dsi_touch: regulator-dsi-touch {
+		compatible = "regulator-fixed";
+		gpio = <&mcu 1 GPIO_ACTIVE_HIGH>;
+		regulator-name = "rpi-touch";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		startup-delay-us = <50000>;
+		enable-active-high;
+	};
+};
+
+&i2c0_mux3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	mcu: gpio at 45 {
+		compatible = "raspberrypi,touchscreen-panel-regulator-v2";
+		reg = <0x45>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		#pwm-cells = <3>;
+	};
+
+	touchscreen at 5d {
+		compatible = "goodix,gt911";
+		reg = <0x5d>;
+		AVDD28-supply = <&reg_dsi_touch>;
+		touchscreen-size-x = <720>;
+		touchscreen-size-y = <1280>;
+	};
+};
+
+&dsi0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port at 1 {
+			reg = <1>;
+
+			dsi0_out: endpoint {
+				remote-endpoint = <&panel_in>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+
+	panel: panel at 0 {
+		reg = <0>;
+		backlight = <&display_bl>;
+		power-supply = <&reg_display>;
+		reset-gpios = <&mcu 0 GPIO_ACTIVE_LOW>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&dsi0_out>;
+			};
+		};
+	};
+};
-- 
2.50.1

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