ARM: dts: sun8i: Add touchscreen node for sun8i-a23-inet86dz

The inet86dz tablet has a gsl1680 touchscreen,
add a dt node describing it.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

arch/arm/boot/dts/sun8i-a23-inet86dz.dts

@@ -53,6 +53,15 @@ &ehci0 {
 	status = "okay";
 };
 
+&touchscreen {
+	reg = <0x40>;
+	compatible = "silead,gsl1680";
+	firmware-name = "gsl1680-inet86dz.fw";
+	touchscreen-size-x = <960>;
+	touchscreen-size-y = <640>;
+	status = "okay";
+};
+
 &usbphy {
 	usb1_vbus-supply = <&reg_dldo1>;
 };