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Linux kernel mirror (for testing)
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linux
1Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
2
3Required 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
18Optional 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
61Example:
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 };