From: Ahmet Inan <inan@distec.de>
Date: Mon, 15 May 2017 15:10:53 +0000 (+0200)
Subject: overlays: Add Goodix overlay
X-Git-Tag: archive/raspbian/4.9.51-1+rpi1~5^2~275
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=4e49b0b16142b3142558c22b36caa533398392cb;p=linux-4.9.git

overlays: Add Goodix overlay

Add support for I2C connected Goodix gt9271 multiple touch controller using
GPIOs 4 and 17 (pins 7 and 11 on GPIO header) for interrupt and reset.

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

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index e2f66a55dc5a..b62edf6ce17e 100644
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -25,6 +25,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	enc28j60.dtbo \
 	enc28j60-spi2.dtbo \
 	fe-pi-audio.dtbo \
+	goodix.dtbo \
 	googlevoicehat-soundcard.dtbo \
 	gpio-ir.dtbo \
 	gpio-poweroff.dtbo \
diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 32e5fc4a9968..b3aadaa6cfaf 100644
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -459,6 +459,14 @@ Load:   dtoverlay=fe-pi-audio
 Params: <None>
 
 
+Name:   goodix
+Info:   Enables I2C connected Goodix gt9271 multiple touch controller using
+        GPIOs 4 and 17 (pins 7 and 11 on GPIO header) for interrupt and reset.
+Load:   dtoverlay=goodix,<param>=<val>
+Params: interrupt               GPIO used for interrupt (default 4)
+        reset                   GPIO used for reset (default 17)
+
+
 Name:   googlevoicehat-soundcard
 Info:   Configures the Google voiceHAT soundcard
 Load:   dtoverlay=googlevoicehat-soundcard
diff --git a/arch/arm/boot/dts/overlays/goodix-overlay.dts b/arch/arm/boot/dts/overlays/goodix-overlay.dts
new file mode 100644
index 000000000000..084f74042ed6
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/goodix-overlay.dts
@@ -0,0 +1,46 @@
+// Device tree overlay for I2C connected Goodix gt9271 multiple touch controller
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&gpio>;
+		__overlay__ {
+			goodix_pins: goodix_pins {
+				brcm,pins = <4 17>; // interrupt and reset
+				brcm,function = <0 0>; // in
+				brcm,pull = <2 2>; // pull-up
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&i2c1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			gt9271: gt9271@14 {
+				compatible = "goodix,gt9271";
+				reg = <0x14>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&goodix_pins>;
+				interrupt-parent = <&gpio>;
+				interrupts = <4 2>; // high-to-low edge triggered
+				irq-gpios = <&gpio 4 0>; // Pin7 on GPIO header
+				reset-gpios = <&gpio 17 0>; // Pin11 on GPIO header
+			};
+		};
+	};
+
+	__overrides__ {
+		interrupt = <&goodix_pins>,"brcm,pins:0",
+			<&gt9271>,"interrupts:0",
+			<&gt9271>,"irq-gpios:4";
+		reset = <&goodix_pins>,"brcm,pins:4",
+			<&gt9271>,"reset-gpios:4";
+	};
+};