49 lines
1014 B
Plaintext
49 lines
1014 B
Plaintext
// Device tree overlay for I2C connected Goodix gt9271 multiple touch controller
|
|
/dts-v1/;
|
|
/plugin/;
|
|
|
|
/ {
|
|
compatible = "brcm,bcm2835";
|
|
|
|
fragment@0 {
|
|
target = <&gpio>;
|
|
__overlay__ {
|
|
pcf8574a_pins: pcf8574a_pins {
|
|
brcm,pins = <4>; // interrupt and reset
|
|
brcm,function = <0>; // in
|
|
brcm,pull = <2>; // pull-up
|
|
};
|
|
};
|
|
};
|
|
|
|
fragment@1 {
|
|
target = <&i2c1>;
|
|
__overlay__ {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
status = "okay";
|
|
|
|
pcf8574a: pcf8574a@3f {
|
|
compatible = "nxp,pcf8574a";
|
|
reg = <0x3f>;
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&pcf8574a_pins>;
|
|
interrupt-parent = <&gpio>;
|
|
interrupt-controller;
|
|
#interrupt-cells = <2>;
|
|
interrupts = <4>; // high-to-low edge triggered
|
|
irq-gpios = <&gpio 4>; // Pin7 on GPIO header
|
|
};
|
|
};
|
|
};
|
|
|
|
__overrides__ {
|
|
addr = <&pcf8574a>,"reg:0";
|
|
interrupt = <&pcf8574a_pins>,"brcm,pins:0",
|
|
<&pcf8574a>,"interrupts:0",
|
|
<&pcf8574a>,"irq-gpios:4";
|
|
};
|
|
};
|