[PATCH v8 07/11] arm64: dts: renesas: rzg2l(c)/rzv2l hb-iiot: add dsi panel dt overlay

From: Josua Mayer

Date: Fri Sep 04 2026 - 10:26:46 EST

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@xxxxxxxxxxxxx>
---
arch/arm64/boot/dts/renesas/Makefile | 8 +++
...hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso | 79 ++++++++++++++++++++++
2 files changed, 87 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..f8584c473fafe
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/rzg2l-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Copyright 2025 Josua Mayer <josua@xxxxxxxxxxxxx>
+ *
+ * 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 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@1 {
+ reg = <1>;
+
+ mipi_dsi_out: endpoint {
+ data-lanes = <1 2 3 4>;
+ remote-endpoint = <&dsi_in_panel>;
+ };
+ };
+ };
+};
+
+&du {
+ status = "okay";
+};

--
2.51.0