summaryrefslogtreecommitdiffstats
path: root/dts/Bindings/input/touchscreen/iqs5xx.txt
blob: efa0820e2469fc5be17727f788de725d021e9cf8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
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>;
		};

		/* ... */
	};