[PATCH v2] arm64: dts: qcom: talos: Add RPi Touch Display 2 5-inch overlay
From: Abhishek Thomas Varghese
Date: Tue Sep 01 2026 - 06:07:44 EST
Add a DT overlay to connect the Raspberry Pi Touch Display 2 5-inch
panel to DSI0 on the Qualcomm IQ615/QCS615 EVK.
The overlay describes the display controller, panel, touch
controller, power supplies, and backlight. Disable the ADV7511
bridge to avoid a conflicting device on DSI virtual channel 0.
Display output, touch input, backlight control, and concurrent
DisplayPort operation have been tested.
Signed-off-by: Abhishek Thomas Varghese <tessolveupstream@xxxxxxxxx>
---
Changes in v2:
- Reference the existing hdmi_bridge node by label.
- Add blank lines before status properties consistently.
- Link to v1: https://lore.kernel.org/r/20260827-talos-rpi-touch-display-v1-1-911705fe6d6d@xxxxxxxxx
---
arch/arm64/boot/dts/qcom/Makefile | 3 +
.../boot/dts/qcom/talos-evk-rpi-display-2-5in.dtso | 88 ++++++++++++++++++++++
2 files changed, 91 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 1c86e7e98f55d539f5292816ce06c9a46bd4904c..7fbf79f65ecb8283e572554838c044d24298d360 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -421,6 +421,9 @@ dtb-$(CONFIG_ARCH_QCOM) += talos-evk-camera-imx577.dtb
talos-evk-lvds-auo,g133han01-dtbs := \
talos-evk.dtb talos-evk-lvds-auo,g133han01.dtbo
dtb-$(CONFIG_ARCH_QCOM) += talos-evk-lvds-auo,g133han01.dtb
+talos-evk-rpi-display-2-5in-dtbs := \
+ talos-evk.dtb talos-evk-rpi-display-2-5in.dtbo
+dtb-$(CONFIG_ARCH_QCOM) += talos-evk-rpi-display-2-5in.dtb
x1e001de-devkit-el2-dtbs := x1e001de-devkit.dtb x1-el2.dtbo
dtb-$(CONFIG_ARCH_QCOM) += x1e001de-devkit.dtb x1e001de-devkit-el2.dtb
x1e78100-lenovo-thinkpad-t14s-el2-dtbs := x1e78100-lenovo-thinkpad-t14s.dtb x1-el2.dtbo
diff --git a/arch/arm64/boot/dts/qcom/talos-evk-rpi-display-2-5in.dtso b/arch/arm64/boot/dts/qcom/talos-evk-rpi-display-2-5in.dtso
new file mode 100644
index 0000000000000000000000000000000000000000..e49da096d9e38476373f8b10f0fb5bec994949a5
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/talos-evk-rpi-display-2-5in.dtso
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+/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;
+ };
+};
+
+&hdmi_bridge {
+ status = "disabled";
+};
+
+&i2c1 {
+ clock-frequency = <400000>;
+
+ status = "okay";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcu: gpio@45 {
+ compatible = "raspberrypi,touchscreen-panel-regulator-v2";
+ reg = <0x45>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ #pwm-cells = <3>;
+ };
+
+ touchscreen@5d {
+ compatible = "goodix,gt911";
+ reg = <0x5d>;
+ AVDD28-supply = <®_dsi_touch>;
+ touchscreen-size-x = <720>;
+ touchscreen-size-y = <1280>;
+ };
+};
+
+&mdss_dsi0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ status = "okay";
+
+ panel: panel@0 {
+ compatible = "raspberrypi,dsi-5inch", "ilitek,ili9881c";
+ reg = <0>;
+
+ backlight = <&display_bl>;
+ power-supply = <®_display>;
+ reset-gpios = <&mcu 0 GPIO_ACTIVE_LOW>;
+
+ port {
+ panel_in: endpoint {
+ remote-endpoint = <&mdss_dsi0_out>;
+ };
+ };
+ };
+};
+
+&mdss_dsi0_out {
+ remote-endpoint = <&panel_in>;
+ data-lanes = <0 1>;
+};
---
base-commit: 6a746cd265aed59107ebdaa9ce039bb832922969
change-id: 20260826-talos-rpi-touch-display-f2f8c580200d
Best regards,
--
Abhishek Thomas Varghese <tessolveupstream@xxxxxxxxx>