Input: goodix - add device tree support

This change adds device tree support and binding information for Goodix
GT9xx series touchscreen controller.  It also adds support for 5-finger
chips, like GT911 and GT912, which can be found on ARM tablets, such as
Wexler TAB7200 and MSI Primo73.

Datasheets can be found here:
https://drive.google.com/folderview?id=0BxCVOQS3ZymGfmJyY2RKbE5XbVlKNlktVTlwV0lxNEdxd2dzeWZER094cmJPVnMxN1F0Yzg&usp=sharing

Signed-off-by: Aleksei Mamlin <mamlinav@gmail.com>
Reviewed-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
new file mode 100644
index 000000000000..8ba98eec765b
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
@@ -0,0 +1,29 @@
+Device tree bindings for Goodix GT9xx series touchscreen controller
+
+Required properties:
+
+ - compatible           : Should be "goodix,gt911"
+                                 or "goodix,gt9110"
+                                 or "goodix,gt912"
+                                 or "goodix,gt927"
+                                 or "goodix,gt9271"
+                                 or "goodix,gt928"
+                                 or "goodix,gt967"
+ - reg                  : I2C address of the chip. Should be 0x5d or 0x14
+ - interrupt-parent     : Interrupt controller to which the chip is connected
+ - interrupts           : Interrupt to which the chip is connected
+
+Example:
+
+        i2c@00000000 {
+                /* ... */
+
+                gt928@5d {
+                        compatible = "goodix,gt928";
+                        reg = <0x5d>;
+                        interrupt-parent = <&gpio>;
+                        interrupts = <0 0>;
+                };
+
+                /* ... */
+        };