Input: atmel_mxt_ts - Update device tree documentation

1 files changed, 18 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
index 6319f07bfbc..a20561aa991 100644
--- a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
+++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
@@ -6,15 +6,29 @@ Required properties:
 
 - reg: The I2C address of the device
 
-- interrupts: The sink for the touch controller CHG/IRQ output
+- interrupts: The sink for the touchpad's IRQ output
     See ../interrupt-controller/interrupts.txt
 
-Optional properties for maXTouch device:
+Optional properties for main touchpad device:
 
-- linux,gpio-keymap: An array of up to 4 entries indicating the Linux
-    keycode generated by each GPIO. Linux keycodes are defined in
+- linux,gpio-keymap: When enabled, the SPT_GPIOPWN_T19 object sends messages
+    on GPIO bit changes. An array of up to 8 entries can be provided
+    indicating the Linux keycode mapped to each bit of the status byte,
+    starting at the LSB. Linux keycodes are defined in
     <dt-bindings/input/input.h>.
 
+    Note: the numbering of the GPIOs and the bit they start at varies between
+    maXTouch devices. You must either refer to the documentation, or
+    experiment to determine which bit corresponds to which input. Use
+    KEY_RESERVED for unused padding values.
+
+- atmel,reset-gpio: Configure RESET GPIO. Required for regulator support.
+
+- atmel,cfg_name: Provide name of configuration file in OBP_RAW format. This
+    will be downloaded from the firmware loader on probe to the device.
+
+- atmel,input_name: Override name of input device from the default.
+
 Example:
 
 	touch@4b {