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Subject[PATCH 3/5] dt-bindings: add more optional properties for elan_i2c touchpads
Some new touchpads IC are connected through PS/2 and I2C. On some of these
new IC, the I2C part doesn't have all of the information available.
We need to be able to forward the touchpad parameters from PS/2 and
thus, we need those new optional properties.

Signed-off-by: Benjamin Tissoires <>
Documentation/devicetree/bindings/input/elan_i2c.txt | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/elan_i2c.txt b/Documentation/devicetree/bindings/input/elan_i2c.txt
index 797607460735..ace6bcb0b4eb 100644
--- a/Documentation/devicetree/bindings/input/elan_i2c.txt
+++ b/Documentation/devicetree/bindings/input/elan_i2c.txt
@@ -13,6 +13,14 @@ Optional properties:
pinctrl binding [1]).
- vcc-supply: a phandle for the regulator supplying 3.3V power.
- elan,trackpoint: touchpad can support a trackpoint (boolean)
+- elan,clickpad: touchpad is a clickpad (the entire surface is a button)
+- elan,max_x: the maximum reported value on the X axis
+- elan,max_y: the maximum reported value on the Y axis
+- elan,min_x: the minimum reported value on the X axis
+- elan,min_y: the minimum reported value on the Y axis
+- elan,x_res: the resolution of the X axis (in units per mm)
+- elan,y_res: the resolution of the Y axis (in units per mm)
+- elan,width: max reported width of a blob

[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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