linux-kernel - [PATCH 3/4] ARM: dts: stm32: enable stmpe811 on stm32429-disco board

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Date:   Thu,  7 May 2020 17:16:11 +0800
From:   dillon.minfei@...il.com
To:     mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        philippe.schenker@...adex.com
Cc:     linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dillon min <dillon.minfei@...il.com>
Subject: [PATCH 3/4] ARM: dts: stm32: enable stmpe811 on stm32429-disco board

From: dillon min <dillon.minfei@...il.com>

Enable the stmpe811 touch screen on stm32429-disco board.

Signed-off-by: dillon min <dillon.minfei@...il.com>
---
 arch/arm/boot/dts/stm32f429-disco.dts | 47 +++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f429-disco.dts b/arch/arm/boot/dts/stm32f429-disco.dts
index 30c0f67..fad1ec1 100644
--- a/arch/arm/boot/dts/stm32f429-disco.dts
+++ b/arch/arm/boot/dts/stm32f429-disco.dts
@@ -49,6 +49,8 @@
 #include "stm32f429.dtsi"
 #include "stm32f429-pinctrl.dtsi"
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "STMicroelectronics STM32F429i-DISCO board";
@@ -127,3 +129,48 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&i2c3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
+	clock-frequency = <100000>;
+	status = "okay";
+
+	stmpe811@41 {
+		compatible = "st,stmpe811";
+		reg = <0x41>;
+		interrupts = <15 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-parent = <&gpioa>;
+		/* 3.25 MHz ADC clock speed */
+		st,adc-freq = <1>;
+		/* 12-bit ADC */
+		st,mod-12b = <1>;
+		/* internal ADC reference */
+		st,ref-sel = <0>;
+		/* ADC converstion time: 80 clocks */
+		st,sample-time = <4>;
+
+		stmpe_touchscreen {
+			compatible = "st,stmpe-ts";
+			/* 8 sample average control */
+			st,ave-ctrl = <3>;
+			/* 7 length fractional part in z */
+			st,fraction-z = <7>;
+			/*
+			 * 50 mA typical 80 mA max touchscreen drivers
+			 * current limit value
+			 */
+			st,i-drive = <1>;
+			/* 1 ms panel driver settling time */
+			st,settling = <3>;
+			/* 5 ms touch detect interrupt delay */
+			st,touch-det-delay = <5>;
+		};
+
+		stmpe_adc {
+			compatible = "st,stmpe-adc";
+			/* forbid to use ADC channels 3-0 (touch) */
+			st,norequest-mask = <0x0F>;
+		};
+	};
+};
-- 
2.7.4