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]> --- Changes since v1: - Document the polled binding in the original file, do not create a new one. (Rob) Documentation/devicetree/bindings/input/mpr121-touchkey.txt | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/input/mpr121-touchkey.txt b/Documentation/devicetree/bindings/input/mpr121-touchkey.txt index b7c61ee5841b..97f55273d473 100644 --- a/Documentation/devicetree/bindings/input/mpr121-touchkey.txt +++ b/Documentation/devicetree/bindings/input/mpr121-touchkey.txt @@ -1,9 +1,14 @@ -* Freescale MPR121 Controllor +* Freescale MPR121 Controller Required Properties: -- compatible: Should be "fsl,mpr121-touchkey" +- compatible: Should be one of: + - "fsl,mpr121-touchkey" - MPR121 with interrupt line + - "fsl,mpr121-touchkey-polled" - MPR121 with polling - reg: The I2C slave address of the device. - interrupts: The interrupt number to the cpu. + In case of "fsl,mpr121-touchkey-polled" the interrupt + line is not used and hence the interrupts property is + not required. - 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 -- 2.1.4
