xref: /linux/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml (revision 86e203edf24bb327ce8fcd3c5c8c6bf530a846df) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/input/atmel,maxtouch.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Atmel maXTouch touchscreen/touchpad
8
9maintainers:
10  - Nick Dyer <nick@shmanahar.org>
11  - Linus Walleij <linus.walleij@linaro.org>
12
13description: |
14  Atmel maXTouch touchscreen or touchpads such as the mXT244
15  and similar devices.
16
17allOf:
18  - $ref: input.yaml#
19
20properties:
21  compatible:
22    const: atmel,maxtouch
23
24  reg:
25    maxItems: 1
26
27  interrupts:
28    maxItems: 1
29
30  vdda-supply:
31    description:
32      Optional regulator for the AVDD analog voltage.
33
34  vdd-supply:
35    description:
36      Optional regulator for the VDD digital voltage.
37
38  reset-gpios:
39    maxItems: 1
40    description:
41      Optional GPIO specifier for the touchscreen's reset pin
42      (active low). The line must be flagged with
43      GPIO_ACTIVE_LOW.
44
45  wake-gpios:
46    maxItems: 1
47    description:
48      Optional GPIO specifier for the touchscreen's wake pin
49      (active low). The line must be flagged with
50      GPIO_ACTIVE_LOW.
51
52  linux,gpio-keymap:
53    $ref: /schemas/types.yaml#/definitions/uint32-array
54    description: |
55      When enabled, the SPT_GPIOPWN_T19 object sends messages
56      on GPIO bit changes. An array of up to 8 entries can be provided
57      indicating the Linux keycode mapped to each bit of the status byte,
58      starting at the LSB. Linux keycodes are defined in
59      <dt-bindings/input/input.h>.
60
61      Note: the numbering of the GPIOs and the bit they start at varies
62      between maXTouch devices. You must either refer to the documentation,
63      or experiment to determine which bit corresponds to which input. Use
64      KEY_RESERVED for unused padding values.
65
66  linux,keycodes:
67    minItems: 1
68    maxItems: 8
69
70  atmel,wakeup-method:
71    $ref: /schemas/types.yaml#/definitions/uint32
72    description: |
73      The WAKE line is an active-low input that is used to wake up the touch
74      controller from deep-sleep mode before communication with the controller
75      could be started. This optional feature used to minimize current
76      consumption when the controller is in deep sleep mode. This feature is
77      relevant only to some controller families, like mXT1386 controller for
78      example.
79
80      The WAKE pin can be connected in one of the following ways:
81       1) left permanently low
82       2) connected to the I2C-compatible SCL pin
83       3) connected to a GPIO pin on the host
84    enum:
85      - 0 # ATMEL_MXT_WAKEUP_NONE
86      - 1 # ATMEL_MXT_WAKEUP_I2C_SCL
87      - 2 # ATMEL_MXT_WAKEUP_GPIO
88    default: 0
89
90  wakeup-source:
91    type: boolean
92
93required:
94  - compatible
95  - reg
96  - interrupts
97
98additionalProperties: false
99
100examples:
101  - |
102    #include <dt-bindings/interrupt-controller/irq.h>
103    #include <dt-bindings/input/atmel-maxtouch.h>
104    #include <dt-bindings/gpio/gpio.h>
105    i2c {
106      #address-cells = <1>;
107      #size-cells = <0>;
108      touchscreen@4a {
109        compatible = "atmel,maxtouch";
110        reg = <0x4a>;
111        interrupt-parent = <&gpio>;
112        interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
113        reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
114        vdda-supply = <&ab8500_ldo_aux2_reg>;
115        vdd-supply = <&ab8500_ldo_aux5_reg>;
116        atmel,wakeup-method = <ATMEL_MXT_WAKEUP_I2C_SCL>;
117      };
118    };
119
120...
121