arm64: dts: mediatek: asurada: Add Elan eKTH3000 I2C trackpad

Add support for the Elan eKTH3000 i2c trackpad present on Asurada. It is
connected to the I2C2 bus and has address 0x15.
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20220629155956.1138955-11-nfraprado@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi

@@ -109,6 +109,16 @@ &i2c2 {
 	clock-stretch-ns = <12600>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c2_pins>;
+
+	trackpad@15 {
+		compatible = "elan,ekth3000";
+		reg = <0x15>;
+		interrupts-extended = <&pio 15 IRQ_TYPE_LEVEL_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&trackpad_pins>;
+		vcc-supply = <&pp3300_u>;
+		wakeup-source;
+	};
 };
 
 &i2c3 {
@@ -436,6 +446,14 @@ pins-bus {
 			bias-disable;
 		};
 	};
+
+	trackpad_pins: trackpad-default-pins {
+		pins-int-n {
+			pinmux = <PINMUX_GPIO15__FUNC_GPIO15>;
+			input-enable;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_11>;
+		};
+	};
 };
 
 &spi1 {