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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/atmel,maxtouch.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Atmel maXTouch touchscreen/touchpad
maintainers:
- Nick Dyer <nick@shmanahar.org>
- Linus Walleij <linus.walleij@linaro.org>
description: |
Atmel maXTouch touchscreen or touchpads such as the mXT244
and similar devices.
properties:
compatible:
const: atmel,maxtouch
reg:
maxItems: 1
interrupts:
maxItems: 1
vdda-supply:
description:
Optional regulator for the AVDD analog voltage.
vdd-supply:
description:
Optional regulator for the VDD digital voltage.
reset-gpios:
maxItems: 1
description:
Optional GPIO specifier for the touchscreen's reset pin
(active low). The line must be flagged with
GPIO_ACTIVE_LOW.
wake-gpios:
maxItems: 1
description:
Optional GPIO specifier for the touchscreen's wake pin
(active low). The line must be flagged with
GPIO_ACTIVE_LOW.
linux,gpio-keymap:
$ref: /schemas/types.yaml#/definitions/uint32-array
description: |
When enabled, the SPT_GPIOPWN_T19 object sends messages
on GPIO bit changes. An array of up to 8 entries can be provided
indicating the Linux keycode mapped to each bit of the status byte,
starting at the LSB. Linux keycodes are defined in
<dt-bindings/input/input.h>.
Note: the numbering of the GPIOs and the bit they start at varies
between maXTouch devices. You must either refer to the documentation,
or experiment to determine which bit corresponds to which input. Use
KEY_RESERVED for unused padding values.
atmel,wakeup-method:
$ref: /schemas/types.yaml#/definitions/uint32
description: |
The WAKE line is an active-low input that is used to wake up the touch
controller from deep-sleep mode before communication with the controller
could be started. This optional feature used to minimize current
consumption when the controller is in deep sleep mode. This feature is
relevant only to some controller families, like mXT1386 controller for
example.
The WAKE pin can be connected in one of the following ways:
1) left permanently low
2) connected to the I2C-compatible SCL pin
3) connected to a GPIO pin on the host
enum:
- 0 # ATMEL_MXT_WAKEUP_NONE
- 1 # ATMEL_MXT_WAKEUP_I2C_SCL
- 2 # ATMEL_MXT_WAKEUP_GPIO
default: 0
wakeup-source:
type: boolean
required:
- compatible
- reg
- interrupts
additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/input/atmel-maxtouch.h>
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
touchscreen@4a {
compatible = "atmel,maxtouch";
reg = <0x4a>;
interrupt-parent = <&gpio>;
interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
vdda-supply = <&ab8500_ldo_aux2_reg>;
vdd-supply = <&ab8500_ldo_aux5_reg>;
atmel,wakeup-method = <ATMEL_MXT_WAKEUP_I2C_SCL>;
};
};
...
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