[PATCH] arm64: dts: renesas: sparrow-hawk: Add overlay for Olimex MIPI-HDMI adapter

[Marek Vasut]

From: Scott Murray <scott.murray at konsulko.com>

Add a DT overlay to bind the Olimex MIPI-HDMI dual-lane DSI-to-HDMI adapter
on the Retronix R-Car V4H Sparrow Hawk board.

Current device link is at https://www.olimex.com/Products/IoT/ESP32-P4/MIPI-HDMI/open-source-hardware

Signed-off-by: Scott Murray <scott.murray at konsulko.com>
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: Scott Murray <scott.murray at konsulko.com>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-renesas-soc at vger.kernel.org
---
 arch/arm64/boot/dts/renesas/Makefile          |  3 +
 ...r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtso | 94 +++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtso

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index bca532eb67b44..65df431adeb6b 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -114,6 +114,9 @@ dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-argon40.dtb
 dtb-$(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-olimex-dsi-hdmi.dtbo
+r8a779g3-sparrow-hawk-olimex-dsi-hdmi-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtbo
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtb
 dtb-$(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
diff --git a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtso b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtso
new file mode 100644
index 0000000000000..dde4122221133
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-olimex-dsi-hdmi.dtso
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Overlay for Olimex MIPI-HDMI adapter connected to J4:DSI
+ * on R-Car V4H ES3.0 Sparrow Hawk board
+ *
+ * Copyright (C) 2026 Scott Murray <scott.murray at konsulko.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&{/} {
+	hdmi-connector {
+		compatible = "hdmi-connector";
+		label = "HDMI1";
+		type = "a";
+		ddc-i2c-bus = <&i2c0_mux3>;
+
+		port {
+			hdmi_connector_in: endpoint {
+				remote-endpoint = <&lt8912b_out>;
+			};
+		};
+	};
+
+	reg_vr1: regulator-vr1 {
+		compatible = "regulator-fixed";
+		regulator-name = "VR1-1.8V";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
+		vin-supply = <&reg_3p3v>;
+	};
+};
+
+&i2c0_mux3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	hdmi-bridge at 48 {
+		compatible = "lontium,lt8912b";
+		reg = <0x48>;
+		vcchdmipll-supply = <&reg_vr1>;
+		vcchdmitx-supply = <&reg_vr1>;
+		vcclvdspll-supply = <&reg_vr1>;
+		vcclvdstx-supply = <&reg_vr1>;
+		vccmipirx-supply = <&reg_vr1>;
+		vccsysclk-supply = <&reg_vr1>;
+		vdd-supply = <&reg_vr1>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port at 0 {
+				reg = <0>;
+
+				hdmi_out_in: endpoint {
+					data-lanes = <1 2>;
+					remote-endpoint = <&dsi0_out>;
+				};
+			};
+
+			port at 1 {
+				reg = <1>;
+
+				lt8912b_out: endpoint {
+					remote-endpoint = <&hdmi_connector_in>;
+				};
+			};
+		};
+	};
+};
+
+&dsi0 {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port at 1 {
+			reg = <1>;
+
+			dsi0_out: endpoint {
+				remote-endpoint = <&hdmi_out_in>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
-- 
2.51.0