On Fri, May 17, 2019 at 03:12:50PM +0200, Michal VokÃÄ 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
'separate' from what?
Signed-off-by: Michal VokÃÄ <michal.vokac@xxxxxxxxx>
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
@@ -1,9 +1,14 @@
-* Freescale MPR121 Controllor
+* Freescale MPR121 Controller
-- 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.