81 lines
2.2 KiB
Plaintext
81 lines
2.2 KiB
Plaintext
Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
|
|
|
|
Required properties:
|
|
|
|
- compatible : Must be equal to one of the following:
|
|
"azoteq,iqs550"
|
|
"azoteq,iqs572"
|
|
"azoteq,iqs525"
|
|
|
|
- reg : I2C slave address for the device.
|
|
|
|
- interrupts : GPIO to which the device's active-high RDY
|
|
output is connected (see [0]).
|
|
|
|
- reset-gpios : GPIO to which the device's active-low NRST
|
|
input is connected (see [1]).
|
|
|
|
Optional properties:
|
|
|
|
- touchscreen-min-x : See [2].
|
|
|
|
- touchscreen-min-y : See [2].
|
|
|
|
- touchscreen-size-x : See [2]. If this property is omitted, the
|
|
maximum x-coordinate is specified by the
|
|
device's "X Resolution" register.
|
|
|
|
- touchscreen-size-y : See [2]. If this property is omitted, the
|
|
maximum y-coordinate is specified by the
|
|
device's "Y Resolution" register.
|
|
|
|
- touchscreen-max-pressure : See [2]. Pressure is expressed as the sum of
|
|
the deltas across all channels impacted by a
|
|
touch event. A channel's delta is calculated
|
|
as its count value minus a reference, where
|
|
the count value is inversely proportional to
|
|
the channel's capacitance.
|
|
|
|
- touchscreen-fuzz-x : See [2].
|
|
|
|
- touchscreen-fuzz-y : See [2].
|
|
|
|
- touchscreen-fuzz-pressure : See [2].
|
|
|
|
- touchscreen-inverted-x : See [2]. Inversion is applied relative to that
|
|
which may already be specified by the device's
|
|
FLIP_X and FLIP_Y register fields.
|
|
|
|
- touchscreen-inverted-y : See [2]. Inversion is applied relative to that
|
|
which may already be specified by the device's
|
|
FLIP_X and FLIP_Y register fields.
|
|
|
|
- touchscreen-swapped-x-y : See [2]. Swapping is applied relative to that
|
|
which may already be specified by the device's
|
|
SWITCH_XY_AXIS register field.
|
|
|
|
[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
|
|
[1]: Documentation/devicetree/bindings/gpio/gpio.txt
|
|
[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
|
|
|
|
Example:
|
|
|
|
&i2c1 {
|
|
/* ... */
|
|
|
|
touchscreen@74 {
|
|
compatible = "azoteq,iqs550";
|
|
reg = <0x74>;
|
|
interrupt-parent = <&gpio>;
|
|
interrupts = <17 4>;
|
|
reset-gpios = <&gpio 27 1>;
|
|
|
|
touchscreen-size-x = <640>;
|
|
touchscreen-size-y = <480>;
|
|
|
|
touchscreen-max-pressure = <16000>;
|
|
};
|
|
|
|
/* ... */
|
|
};
|