The STMPE811 is able to only monitor a subwindow of the
entire screen. Touches outside of this window are neglected.
This change adds the corresponding documentation.
Signed-off-by: Leif Middelschulte <leif.middelschulte@xxxxxxxxxxxxx>
---
.../devicetree/bindings/input/touchscreen/stmpe.txt | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
index c549924603d2..04962e2e1ad0 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
@@ -33,6 +33,13 @@ Optional properties:
- st,i-drive : current limit value of the touchscreen drivers
0 -> 20 mA (typical 35mA max)
1 -> 50 mA (typical 80 mA max)
+- st,window-tracking : An u12 array that allows to pre-set a sub-window in the touchscreen.
+ Any touch position that is outside the sub-window is discarded
+ (top-right x, top-right y, bottom-left x, bottom-left y).
+ The given window also affects the value range (limits) set
+ within the input subsystem which, in turn, affects
+ the input resolution calculation on both axes.
+
Optional properties common with MFD (deprecated):
- st,sample-time : ADC conversion time in number of clock.
@@ -101,6 +108,8 @@ stmpe811@41 {
* current limit value
*/
st,i-drive = <1>;
+ /* enable entire window */
+ st,window-tracking = /bits/ 16 <4095 4095 0 0>;
};
stmpe_adc {
compatible = "st,stmpe-adc";
--
2.21.0
