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From c0dfc87e355a7c6e434122e1a4fcc69729970610 Mon Sep 17 00:00:00 2001
From: Samuel Hsu <hsu@distec.de>
Date: Mon, 8 Apr 2019 17:06:44 +0200
Subject: [PATCH] BCM2708: Add core Device Tree support, ilitek251x
Signed-off-by: Samuel Hsu <hsu@distec.de>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 11 +++++
.../boot/dts/overlays/ilitek251x-overlay.dts | 45 +++++++++++++++++++
3 files changed, 57 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/ilitek251x-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -67,6 +67,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
i2c0-bcm2708.dtbo \
i2c1-bcm2708.dtbo \
i2s-gpio28-31.dtbo \
+ ilitek251x.dtbo \
iqaudio-dac.dtbo \
iqaudio-dacplus.dtbo \
iqaudio-digi-wm8804-audio.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1146,6 +1146,17 @@ Load: dtoverlay=i2s-gpio28-31
Params: <None>
+Name: ilitek251x
+Info: Enables I2C connected Ilitek 251x multiple touch controller using
+ GPIO 4 (pin 7 on GPIO header) for interrupt.
+Load: dtoverlay=ilitek251x,<param>=<val>
+Params: interrupt GPIO used for interrupt (default 4)
+ sizex Touchscreen size x, horizontal resolution of
+ touchscreen (in pixels)
+ sizey Touchscreen size y, vertical resolution of
+ touchscreen (in pixels)
+
+
Name: iqaudio-dac
Info: Configures the IQaudio DAC audio card
Load: dtoverlay=iqaudio-dac,<param>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/ilitek251x-overlay.dts
@@ -0,0 +1,45 @@
+// Device tree overlay for I2C connected Ilitek multiple touch controller
+/dts-v1/;
+/plugin/;
+
+ / {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target = <&gpio>;
+ __overlay__ {
+ ili251x_pins: ili251x_pins {
+ brcm,pins = <4>; // interrupt
+ brcm,function = <0>; // in
+ brcm,pull = <2>; // pull-up //
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&i2c1>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ ili251x: ili251x@41 {
+ compatible = "ilitek,ili251x";
+ reg = <0x41>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&ili251x_pins>;
+ interrupt-parent = <&gpio>;
+ interrupts = <4 8>; // high-to-low edge triggered
+ touchscreen-size-x = <16384>;
+ touchscreen-size-y = <9600>;
+ };
+ };
+ };
+
+ __overrides__ {
+ interrupt = <&ili251x_pins>,"brcm,pins:0",
+ <&ili251x>,"interrupts:0";
+ sizex = <&ili251x>,"touchscreen-size-x:0";
+ sizey = <&ili251x>,"touchscreen-size-y:0";
+ };
+};
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