linux-kernel - [PATCH v2 4/4] arm64: dts: freescale: imx93-var-som: Add support for ADS7846 touchscreen

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Message-ID: <20251030120127.509933-5-stefano.radaelli21@gmail.com>
Date: Thu, 30 Oct 2025 13:01:24 +0100
From: Stefano Radaelli <stefano.radaelli21@...il.com>
To: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Stefano Radaelli <stefano.radaelli21@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 4/4] arm64: dts: freescale: imx93-var-som: Add support for ADS7846 touchscreen

The VAR-SOM-MX93 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 and the appropriate SPI controller.

Signed-off-by: Stefano Radaelli <stefano.radaelli21@...il.com>
---
v2:
 - Fix pinctrl alignment

 .../boot/dts/freescale/imx93-var-som.dtsi     | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi
index 0b7f6740e5ad..2dc8b18ae91e 100644
--- a/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi
@@ -212,6 +212,38 @@ wm8904: audio-codec@1a {
 	};
 };
 
+&lpspi8 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lpspi8>;
+	cs-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
+	status = "okay";
+
+	/* Resistive touch controller */
+	ads7846: touchscreen@0 {
+		compatible = "ti,ads7846";
+		reg = <0>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_restouch>;
+		interrupt-parent = <&gpio4>;
+		interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
+		spi-max-frequency = <1000000>;
+		pendown-gpio = <&gpio4 29 0>;
+		vcc-supply = <&buck5>;
+		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;
+	};
+};
+
 /* BT module */
 &lpuart5 {
 	pinctrl-names = "default";
@@ -307,6 +339,15 @@ MX93_PAD_GPIO_IO29__GPIO2_IO29		0x40000b9e
 		>;
 	};
 
+	pinctrl_lpspi8: lpspi8grp {
+		fsl,pins = <
+			MX93_PAD_GPIO_IO12__GPIO2_IO12		0x31e
+			MX93_PAD_GPIO_IO13__LPSPI8_SIN		0x31e
+			MX93_PAD_GPIO_IO14__LPSPI8_SOUT		0x31e
+			MX93_PAD_GPIO_IO15__LPSPI8_SCK		0x31e
+		>;
+	};
+
 	pinctrl_lpuart5: lpuart5grp {
 		fsl,pins = <
 			MX93_PAD_DAP_TDO_TRACESWO__LPUART5_TX   0x31e
@@ -316,6 +357,12 @@ MX93_PAD_DAP_TCLK_SWCLK__LPUART5_CTS_B  0x31e
 		>;
 	};
 
+	pinctrl_restouch: restouchgrp {
+		fsl,pins = <
+			MX93_PAD_CCM_CLKO4__GPIO4_IO29		0x31e
+		>;
+	};
+
 	pinctrl_sai1: sai1grp {
 		fsl,pins = <
 			MX93_PAD_SAI1_TXC__SAI1_TX_BCLK		0x31e
-- 
2.43.0