1FocalTech EDT-FT5x06 Polytouch driver
2=====================================
3
4There are 3 variants of the chip for various touch panel sizes
5FT5206GE1  2.8" .. 3.8"
6FT5306DE4  4.3" .. 7"
7FT5406EE8  7"   .. 8.9"
8FT5506EEG  7"   .. 8.9"
9
10The software interface is identical for all those chips, so that
11currently there is no need for the driver to distinguish between the
12different chips. Nevertheless distinct compatible strings are used so
13that a distinction can be added if necessary without changing the DT
14bindings.
15
16
17Required properties:
18 - compatible:  "edt,edt-ft5206"
19           or:  "edt,edt-ft5306"
20           or:  "edt,edt-ft5406"
21           or:  "edt,edt-ft5506"
22
23 - reg:         I2C slave address of the chip (0x38)
24 - interrupt-parent: a phandle pointing to the interrupt controller
25                     serving the interrupt for this chip
26 - interrupts:       interrupt specification for the touchdetect
27                     interrupt
28
29Optional properties:
30 - reset-gpios: GPIO specification for the RESET input
31 - wake-gpios:  GPIO specification for the WAKE input
32
33 - pinctrl-names: should be "default"
34 - pinctrl-0:   a phandle pointing to the pin settings for the
35                control gpios
36
37 - threshold:   allows setting the "click"-threshold in the range
38                from 20 to 80.
39
40 - gain:        allows setting the sensitivity in the range from 0 to
41                31. Note that lower values indicate higher
42                sensitivity.
43
44 - offset:      allows setting the edge compensation in the range from
45                0 to 31.
46
47Example:
48	polytouch: edt-ft5x06@38 {
49		compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
50		reg = <0x38>;
51		pinctrl-names = "default";
52		pinctrl-0 = <&edt_ft5x06_pins>;
53		interrupt-parent = <&gpio2>;
54		interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
55		reset-gpios = <&gpio2 6 GPIO_ACTIVE_LOW>;
56		wake-gpios = <&gpio4 9 GPIO_ACTIVE_HIGH>;
57	};
58