On Fri, May 17, 2019 at 03:12:50PM +0200, Michal Vokáč wrote: > 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. 'separate' from what? > > Signed-off-by: Michal Vokáč <michal.vokac@xxxxxxxxx> > --- > 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. Absence of the interrupts property is enough to determine polled mode and you don't need a separate compatible string. > - 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 >
