linux-kernel - [PATCH v1 4/4] arm64: dts: freescale: imx93-var-som: Add support for ADS7846 touchscreen

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Message-ID: <20251029192852.656806-5-stefano.radaelli21@gmail.com>
Date: Wed, 29 Oct 2025 20:28:49 +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 v1 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>
---
 .../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 d94b40d1d804..01adf7b5ac12 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