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