From: Ahmet Inan <inan@aicodix.de>
Date: Fri, 1 Sep 2017 13:18:01 +0000 (+0200)
Subject: overlays: Add EETI EXC3000 overlay
X-Git-Tag: archive/raspbian/4.9.82-1+deb9u3+rpi1_jessie~5^2~41
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=b2825eaa37ee9507083805ffaf0241fbd12f424c;p=linux-4.9.git

overlays: Add EETI EXC3000 overlay

Add support for I2C connected EETI EXC3000 multiple touch controller
using GPIO 4 (pin 7 on GPIO header) for interrupt.

Signed-off-by: Ahmet Inan <inan@aicodix.de>
---

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index 8090fee1d5a4..bc997af70665 100644
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -26,6 +26,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	dwc2.dtbo \
 	enc28j60.dtbo \
 	enc28j60-spi2.dtbo \
+	exc3000.dtbo \
 	fe-pi-audio.dtbo \
 	goodix.dtbo \
 	googlevoicehat-soundcard.dtbo \
diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 1cf89d6423ac..afc7eea8ced4 100644
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -468,6 +468,18 @@ Params: int_pin                 GPIO used for INT (default 39)
         speed                   SPI bus speed (default 12000000)
 
 
+Name:   exc3000
+Info:   Enables I2C connected EETI EXC3000 multiple touch controller using
+        GPIO 4 (pin 7 on GPIO header) for interrupt.
+Load:   dtoverlay=exc3000,<param>=<val>
+Params: interrupt               GPIO used for interrupt (default 4)
+        sizex                   Touchscreen size x (default 4096)
+        sizey                   Touchscreen size y (default 4096)
+        invx                    Touchscreen inverted x axis
+        invy                    Touchscreen inverted y axis
+        swapxy                  Touchscreen swapped x y axis
+
+
 Name:   fe-pi-audio
 Info:   Configures the Fe-Pi Audio Sound Card
 Load:   dtoverlay=fe-pi-audio
diff --git a/arch/arm/boot/dts/overlays/exc3000-overlay.dts b/arch/arm/boot/dts/overlays/exc3000-overlay.dts
new file mode 100644
index 000000000000..c5694033d03f
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/exc3000-overlay.dts
@@ -0,0 +1,48 @@
+// Device tree overlay for I2C connected EETI EXC3000 multiple touch controller
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&gpio>;
+		__overlay__ {
+			exc3000_pins: exc3000_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";
+
+			exc3000: exc3000@2a {
+				compatible = "eeti,exc3000";
+				reg = <0x2a>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&exc3000_pins>;
+				interrupt-parent = <&gpio>;
+				interrupts = <4 8>; // active low level-sensitive
+				touchscreen-size-x = <4096>;
+				touchscreen-size-y = <4096>;
+			};
+		};
+	};
+
+	__overrides__ {
+		interrupt = <&exc3000_pins>,"brcm,pins:0",
+			<&exc3000>,"interrupts:0";
+		sizex = <&exc3000>,"touchscreen-size-x:0";
+		sizey = <&exc3000>,"touchscreen-size-y:0";
+		invx = <&exc3000>,"touchscreen-inverted-x?";
+		invy = <&exc3000>,"touchscreen-inverted-y?";
+		swapxy = <&exc3000>,"touchscreen-swapped-x-y?";
+	};
+};