[PATCH 15/16] arm64: dts: renesas: Add DSI overlay for RZ/G3L SMARC EVK with ADV7535

[Biju]

From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>

Add a Device Tree overlay (r9a08g046l48-smarc-dsi-adv7535.dtso) for the
RZ/G3L (R9A08G046) SMARC EVK board to support DSI-to-HDMI output via the
Analog Devices ADV7535 HDMI transmitter.

The overlay enables the DSI controller with a 4-lane data path and the
display unit (DU/LCDC), and configures the ADV7535 on I2C2.

Update the Makefile to build the overlay as both a standalone .dtbo and
a composite .dtb (base DTB + overlay).

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/renesas/Makefile          |  3 +
 .../r9a08g046l48-smarc-dsi-adv7535.dtso       | 95 +++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 arch/arm64/boot/dts/renesas/r9a08g046l48-smarc-dsi-adv7535.dtso

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index 8bf155badd11..8c6a44890715 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -187,6 +187,9 @@ r9a08g045s33-smarc-pmod1-type-3a-dtbs := r9a08g045s33-smarc.dtb r9a08g045s33-sma
 dtb-$(CONFIG_ARCH_R9A08G045) += r9a08g045s33-smarc-pmod1-type-3a.dtb
 
 dtb-$(CONFIG_ARCH_R9A08G046) += r9a08g046l48-smarc.dtb
+dtb-$(CONFIG_ARCH_R9A08G046) += r9a08g046l48-smarc-dsi-adv7535.dtbo
+r9a08g046l48-smarc-dsi-adv7535-dtbs := r9a08g046l48-smarc.dtb r9a08g046l48-smarc-dsi-adv7535.dtbo
+dtb-$(CONFIG_ARCH_R9A08G046) += r9a08g046l48-smarc-dsi-adv7535.dtb
 
 dtb-$(CONFIG_ARCH_R9A09G011) += r9a09g011-v2mevk2.dtb
 
diff --git a/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc-dsi-adv7535.dtso b/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc-dsi-adv7535.dtso
new file mode 100644
index 000000000000..cede3b4ba318
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc-dsi-adv7535.dtso
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree overlay for the RZ/G3L SMARC EVK with ADV7535
+ * connected to DSI and LCDC enabled.
+ *
+ * Copyright (C) 2026 Renesas Electronics Corp.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/pinctrl/renesas,r9a08g046-pinctrl.h>
+
+&{/} {
+	osc1: cec-clock {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <12000000>;
+	};
+
+	dsi-to-hdmi-out {
+		compatible = "hdmi-connector";
+		type = "d";
+
+		port {
+			dsi_to_hdmi_con_out: endpoint {
+				remote-endpoint = <&adv7535_out>;
+			};
+		};
+	};
+};
+
+&dsi {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@1 {
+			reg = <1>;
+			dsi_out: endpoint {
+				data-lanes = <1 2 3 4>;
+				remote-endpoint = <&adv7535_in>;
+			};
+		};
+	};
+};
+
+&du {
+	status = "okay";
+};
+
+&i2c2 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	adv7535: hdmi@3d {
+		compatible = "adi,adv7535";
+		reg = <0x3d>;
+
+		interrupts-extended = <&pinctrl RZG3L_GPIO(K, 3) IRQ_TYPE_EDGE_FALLING>;
+		clocks = <&osc1>;
+		clock-names = "cec";
+		avdd-supply = <&reg_1p8v>;
+		dvdd-supply = <&reg_1p8v>;
+		pvdd-supply = <&reg_1p8v>;
+		a2vdd-supply = <&reg_1p8v>;
+		v3p3-supply = <&reg_3p3v>;
+		v1p2-supply = <&reg_1p8v>;
+
+		adi,dsi-lanes = <4>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				adv7535_in: endpoint {
+					remote-endpoint = <&dsi_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+				adv7535_out: endpoint {
+					remote-endpoint = <&dsi_to_hdmi_con_out>;
+				};
+			};
+		};
+	};
+};
-- 
2.43.0