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Subject[RFC PATCH v2 1/4] dt-bindings: input: Add support for the MPR121 without interrupt line
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

Signed-off-by: Michal Vokáč <>
Changes since v1:
- Document the polled binding in the original file, do not create a new one.

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
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