dt-bindings: input: touchscreen: add bindings for eeti touchscreen controller

Describe the bindings for EETI touchscreen controllers.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/touchscreen/eeti.txt b/Documentation/devicetree/bindings/input/touchscreen/eeti.txt
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+Bindings for EETI touchscreen controller
+
+Required properties:
+- compatible:  should be "eeti,exc3000-i2c"
+- reg:         I2C address of the chip. Should be set to <0xa>
+- interrupts:  interrupt to which the chip is connected
+
+Optional properties:
+- attn-gpios:  A handle to a GPIO to check whether interrupt is still
+               latched. This is necessary for platforms that lack
+               support for level-triggered IRQs.
+
+The following optional properties described in touchscreen.txt are
+also supported:
+
+- touchscreen-inverted-x
+- touchscreen-inverted-y
+- touchscreen-swapped-x-y
+
+Example:
+
+i2c-master {
+       touchscreen@a {
+               compatible = "eeti,exc3000-i2c";
+               reg = <0xa>;
+               interrupt-parent = <&gpio>;
+               interrupts = <123 IRQ_TYPE_EDGE_RISING>;
+               attn-gpios = <&gpio 123 GPIO_ACTIVE_HIGH>;
+       };
+};