Normally, the MPR121 controller uses separate interrupt line to notify the I2C host that a key was touched/released. To support platforms that can not use the interrupt line, polling of the MPR121 registers can be used.
Signed-off-by: Michal Vokáč <[email protected]> --- .../bindings/input/mpr121-touchkey-polled.txt | 26 ++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt diff --git a/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt b/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt new file mode 100644 index 000000000000..6bb1d312614c --- /dev/null +++ b/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt @@ -0,0 +1,26 @@ +* Freescale MPR121 Controller without interrupt line + +Required Properties: +- compatible: Should be "fsl,mpr121-touchkey-polled" +- reg: The I2C slave address of the device. +- vdd-supply: Phandle to the Vdd power supply. +- linux,keycodes: Specifies an array of numeric keycode values to + be used for reporting button presses. The array can + contain up to 12 entries. + +Optional Properties: +- autorepeat: Enable autorepeat feature. + +Example: + +#include "dt-bindings/input/input.h" + + touchkeys: keys@5a { + compatible = "fsl,mpr121-touchkey-polled"; + reg = <0x5a>; + autorepeat; + vdd-supply = <&ldo4_reg>; + linux,keycodes = <KEY_0>, <KEY_1>, <KEY_2>, <KEY_3>, + <KEY_4> <KEY_5>, <KEY_6>, <KEY_7>, + <KEY_8>, <KEY_9>, <KEY_A>, <KEY_B>; + }; -- 2.1.4
