Input: add support for Elan eKTF2127 touchscreen controller

This adds a driver for the Elan eKTF2127 touchscreen controller,
which speaks an i2c protocol which is distinctly different from
the already supported eKTH controllers.

Signed-off-by: Michel Verlaan <michel.verl@gmail.com>
Signed-off-by: Siebren Vroegindeweij <siebren.vroegindeweij@hotmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt b/Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt
new file mode 100644
index 000000000000..5a19f4c3e9d7
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt
@@ -0,0 +1,27 @@
+* Elan eKTF2127 I2C touchscreen controller
+
+Required properties:
+ - compatible             : "elan,ektf2127"
+ - reg                    : I2C slave address of the chip (0x40)
+ - interrupt-parent       : a phandle pointing to the interrupt controller
+                            serving the interrupt for this chip
+ - interrupts             : interrupt specification for the ektf2127 interrupt
+ - power-gpios            : GPIO specification for the pin connected to the
+                            ektf2127's wake input. This needs to be driven high
+                            to take ektf2127 out of it's low power state
+
+For additional optional properties see: touchscreen.txt
+
+Example:
+
+i2c@00000000 {
+        ektf2127: touchscreen@15 {
+                compatible = "elan,ektf2127";
+                reg = <0x15>;
+                interrupt-parent = <&pio>;
+                interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>
+                power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
+                touchscreen-inverted-x;
+                touchscreen-swapped-x-y;
+        };
+};