[PATCH v4 7/7] arm64: dts: renesas: rzg2l(c)/rzv2l hb-iiot: add dsi panel dt overlay

[Josua Mayer <josua@solid-run.com>]

The SolidRun Hummingboard IIoT features a DSI connector supporting
touch-screen displays and is usable with RZ/G2L, RZ/G2LC and RZ/V2L
SoMs.

Provide addon for the Winstar WJ70N3TYJHMNG0 1024x600 dsi panel.

Add the addon in Makefile for all supported SoMs SoC targets.

Signed-off-by: Josua Mayer <josua@solid-run.com>
---
 arch/arm64/boot/dts/renesas/Makefile               |  8 +++
 ...hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso | 74 ++++++++++++++++++++++
 2 files changed, 82 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index 69b1f75156016..0bc2bbff9370f 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -170,6 +170,8 @@ r9a07g044c2-hummingboard-iiot-emmc-dtbs := r9a07g044c2-hummingboard-iiot.dtb rzg
 dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044c2-hummingboard-iiot-emmc.dtb
 r9a07g044c2-hummingboard-iiot-microsd-dtbs := r9a07g044c2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-microsd.dtbo
 dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044c2-hummingboard-iiot-microsd.dtb
+r9a07g044c2-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0-dtbs := r9a07g044c2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044c2-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtb
 r9a07g044c2-hummingboard-iiot-rs485-a-dtbs := r9a07g044c2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-rs485-a.dtbo
 dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044c2-hummingboard-iiot-rs485-a.dtb
 r9a07g044c2-hummingboard-iiot-rs485-b-dtbs := r9a07g044c2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-rs485-b.dtbo
@@ -186,6 +188,9 @@ dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044l2-hummingboard-iiot-emmc.dtb
 dtb-$(CONFIG_ARCH_R9A07G044) += rzg2l-hummingboard-iiot-microsd.dtbo
 r9a07g044l2-hummingboard-iiot-microsd-dtbs := r9a07g044l2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-microsd.dtbo
 dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044l2-hummingboard-iiot-microsd.dtb
+dtb-$(CONFIG_ARCH_R9A07G044) += rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+r9a07g044l2-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0-dtbs := r9a07g044l2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044l2-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtb
 dtb-$(CONFIG_ARCH_R9A07G044) += rzg2l-hummingboard-iiot-rs485-a.dtbo
 r9a07g044l2-hummingboard-iiot-rs485-a-dtbs := r9a07g044l2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-rs485-a.dtbo
 dtb-$(CONFIG_ARCH_R9A07G044) += r9a07g044l2-hummingboard-iiot-rs485-a.dtb
@@ -205,6 +210,9 @@ dtb-$(CONFIG_ARCH_R9A07G054) += r9a07g054l2-hummingboard-iiot-emmc.dtb
 dtb-$(CONFIG_ARCH_R9A07G054) += rzg2l-hummingboard-iiot-microsd.dtbo
 r9a07g054l2-hummingboard-iiot-microsd-dtbs := r9a07g054l2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-microsd.dtbo
 dtb-$(CONFIG_ARCH_R9A07G054) += r9a07g054l2-hummingboard-iiot-microsd.dtb
+dtb-$(CONFIG_ARCH_R9A07G054) += rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+r9a07g054l2-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0-dtbs := r9a07g054l2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+dtb-$(CONFIG_ARCH_R9A07G054) += r9a07g054l2-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtb
 dtb-$(CONFIG_ARCH_R9A07G054) += rzg2l-hummingboard-iiot-rs485-a.dtbo
 r9a07g054l2-hummingboard-iiot-rs485-a-dtbs := r9a07g054l2-hummingboard-iiot.dtb rzg2l-hummingboard-iiot-rs485-a.dtbo
 dtb-$(CONFIG_ARCH_R9A07G054) += r9a07g054l2-hummingboard-iiot-rs485-a.dtb
diff --git a/arch/arm64/boot/dts/renesas/rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso b/arch/arm64/boot/dts/renesas/rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso
new file mode 100644
index 0000000000000..e43a38d5330e6
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Copyright 2025 Josua Mayer <josua@solid-run.com>
+ *
+ * Overlay for enabling HummingBoard IIoT MIPI-DSI connector
+ * with Winstar WJ70N3TYJHMNG0 panel.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+&{/} {
+	dsi_backlight: dsi-backlight {
+		compatible = "gpio-backlight";
+		gpios = <&tca6408_u48 3 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&i2c_dsi {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	touchscreen@41 {
+		compatible = "ilitek,ili2130";
+		reg = <0x41>;
+		/*
+		 * Touchscreen fires short active-low pulses which level trigger
+		 * on i2c gpio expander can miss. Trigger on falling edge instead.
+		 */
+		interrupts-extended = <&tca6416_u21 13 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&tca6408_u48 6 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&dsi {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	panel@0 {
+		/* This is a Winstar panel, but the ronbo panel uses same controls. */
+		compatible = "ronbo,rb070d30";
+		reg = <0>;
+		/* reset is active-low but driver inverts it internally */
+		reset-gpios = <&tca6408_u48 1 GPIO_ACTIVE_HIGH>;
+		backlight = <&dsi_backlight>;
+		power-gpios = <&tca6408_u48 2 GPIO_ACTIVE_HIGH>;
+		shlr-gpios = <&tca6408_u48 4 GPIO_ACTIVE_LOW>;
+		updn-gpios = <&tca6408_u48 5 GPIO_ACTIVE_HIGH>;
+		vcc-lcd-supply = <&reg_dsi_panel>;
+
+		port {
+			dsi_in_panel: endpoint {
+				remote-endpoint = <&mipi_dsi_out>;
+			};
+		};
+	};
+
+	ports {
+		port@1 {
+			mipi_dsi_out: endpoint {
+				data-lanes = <1 2 3 4>;
+				remote-endpoint = <&dsi_in_panel>;
+			};
+		};
+	};
+};
+
+&du {
+	status = "okay";
+};

-- 
2.51.0