Documentation/devicetree/bindings/input/touchscreen/iqs5xx.txt

   1 Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
   2
   3 Required properties:
   4
   5 - compatible                    : Must be equal to one of the following:
   6                                   "azoteq,iqs550"
   7                                   "azoteq,iqs572"
   8                                   "azoteq,iqs525"
   9
  10 - reg                           : I2C slave address for the device.
  11
  12 - interrupts                    : GPIO to which the device's active-high RDY
  13                                   output is connected (see [0]).
  14
  15 - reset-gpios                   : GPIO to which the device's active-low NRST
  16                                   input is connected (see [1]).
  17
  18 Optional properties:
  19
  20 - touchscreen-min-x             : See [2].
  21
  22 - touchscreen-min-y             : See [2].
  23
  24 - touchscreen-size-x            : See [2]. If this property is omitted, the
  25                                   maximum x-coordinate is specified by the
  26                                   device's "X Resolution" register.
  27
  28 - touchscreen-size-y            : See [2]. If this property is omitted, the
  29                                   maximum y-coordinate is specified by the
  30                                   device's "Y Resolution" register.
  31
  32 - touchscreen-max-pressure      : See [2]. Pressure is expressed as the sum of
  33                                   the deltas across all channels impacted by a
  34                                   touch event. A channel's delta is calculated
  35                                   as its count value minus a reference, where
  36                                   the count value is inversely proportional to
  37                                   the channel's capacitance.
  38
  39 - touchscreen-fuzz-x            : See [2].
  40
  41 - touchscreen-fuzz-y            : See [2].
  42
  43 - touchscreen-fuzz-pressure     : See [2].
  44
  45 - touchscreen-inverted-x        : See [2]. Inversion is applied relative to that
  46                                   which may already be specified by the device's
  47                                   FLIP_X and FLIP_Y register fields.
  48
  49 - touchscreen-inverted-y        : See [2]. Inversion is applied relative to that
  50                                   which may already be specified by the device's
  51                                   FLIP_X and FLIP_Y register fields.
  52
  53 - touchscreen-swapped-x-y       : See [2]. Swapping is applied relative to that
  54                                   which may already be specified by the device's
  55                                   SWITCH_XY_AXIS register field.
  56
  57 [0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
  58 [1]: Documentation/devicetree/bindings/gpio/gpio.txt
  59 [2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
  60
  61 Example:
  62
  63         &i2c1 {
  64                 /* ... */
  65
  66                 touchscreen@74 {
  67                         compatible = "azoteq,iqs550";
  68                         reg = <0x74>;
  69                         interrupt-parent = <&gpio>;
  70                         interrupts = <17 4>;
  71                         reset-gpios = <&gpio 27 1>;
  72
  73                         touchscreen-size-x = <640>;
  74                         touchscreen-size-y = <480>;
  75
  76                         touchscreen-max-pressure = <16000>;
  77                 };
  78
  79                 /* ... */
  80         };