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