linux-kernel - [PATCH v1 3/3] arm64: dts: ti: var-som-am62p: Add support for ADS7846 touchscreen

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Message-ID: <20251003125031.30539-4-stefano.radaelli21@gmail.com>
Date: Fri,  3 Oct 2025 14:50:29 +0200
From: Stefano Radaelli <stefano.radaelli21@...il.com>
To: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Stefano Radaelli <stefano.radaelli21@...il.com>,
	Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v1 3/3] arm64: dts: ti: var-som-am62p: Add support for ADS7846 touchscreen

The VAR-SOM-AM62P integrates an ADS7846 resistive touchscreen controller.
The controller is physically located on the SOM, and its signals are
routed to the SOM pins, allowing carrier boards to make use of it.

This patch adds the ADS7846 node under the appropriate SPI controller.

Signed-off-by: Stefano Radaelli <stefano.radaelli21@...il.com>
---
 arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi b/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi
index aba72d0b767c..fc5a3942cde0 100644
--- a/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi
@@ -322,6 +322,30 @@ &main_spi0 {
 	pinctrl-0 = <&pinctrl_spi0>;
 	ti,pindir-d0-out-d1-in;
 	status = "okay";
+
+	/* Resistive touch controller */
+	ads7846: touchscreen@0 {
+		compatible = "ti,ads7846";
+		reg = <0>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_restouch>;
+		interrupt-parent = <&main_gpio0>;
+		interrupts = <48 IRQ_TYPE_EDGE_FALLING>;
+		spi-max-frequency = <1500000>;
+		pendown-gpio = <&main_gpio0 48 GPIO_ACTIVE_LOW>;
+		ti,x-min = /bits/ 16 <125>;
+		ti,x-max = /bits/ 16 <4008>;
+		ti,y-min = /bits/ 16 <282>;
+		ti,y-max = /bits/ 16 <3864>;
+		ti,x-plate-ohms = /bits/ 16 <180>;
+		ti,pressure-max = /bits/ 16 <255>;
+		ti,debounce-max = /bits/ 16 <10>;
+		ti,debounce-tol = /bits/ 16 <3>;
+		ti,debounce-rep = /bits/ 16 <1>;
+		ti,settle-delay-usec = /bits/ 16 <150>;
+		ti,keep-vref-on;
+		wakeup-source;
+	};
 };
 
 &main_uart5 {
-- 
2.47.3