Documentation/devicetree/bindings/input/touchscreen/stmpe.txt

   1 STMPE Touchscreen
   2 ----------------
   3
   4 Required properties:
   5  - compatible: "st,stmpe-ts"
   6
   7 Optional properties:
   8 - st,sample-time: ADC converstion time in number of clock.  (0 -> 36 clocks, 1 ->
   9   44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, 4 -> 80 clocks, 5 -> 96 clocks, 6
  10   -> 144 clocks), recommended is 4.
  11 - st,mod-12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
  12 - st,ref-sel: ADC reference source (0 -> internal reference, 1 -> external
  13   reference)
  14 - st,adc-freq: ADC Clock speed (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
  15 - st,ave-ctrl: Sample average control (0 -> 1 sample, 1 -> 2 samples, 2 -> 4
  16   samples, 3 -> 8 samples)
  17 - st,touch-det-delay: Touch detect interrupt delay (0 -> 10 us, 1 -> 50 us, 2 ->
  18   100 us, 3 -> 500 us, 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) recommended
  19   is 3
  20 - st,settling: Panel driver settling time (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3
  21   -> 1 ms, 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) recommended is 2
  22 - st,fraction-z: Length of the fractional part in z (fraction-z ([0..7]) = Count of
  23   the fractional part) recommended is 7
  24 - st,i-drive: current limit value of the touchscreen drivers (0 -> 20 mA typical 35
  25   mA max, 1 -> 50 mA typical 80 mA max)
  26
  27 Node name must be stmpe_touchscreen and should be child node of stmpe node to
  28 which it belongs.
  29
  30 Example:
  31
  32         stmpe_touchscreen {
  33                 compatible = "st,stmpe-ts";
  34                 st,sample-time = <4>;
  35                 st,mod-12b = <1>;
  36                 st,ref-sel = <0>;
  37                 st,adc-freq = <1>;
  38                 st,ave-ctrl = <1>;
  39                 st,touch-det-delay = <2>;
  40                 st,settling = <2>;
  41                 st,fraction-z = <7>;
  42                 st,i-drive = <1>;
  43         };