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113 lines
3.2 KiB
113 lines
3.2 KiB
# 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 <[email protected]> |
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- Linus Walleij <[email protected]> |
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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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