149 lines
4.3 KiB
YAML
149 lines
4.3 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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$id: http://devicetree.org/schemas/input/touchscreen/cypress,cy8ctma340.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Cypress CY8CTMA340 series touchscreen controller
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description: The Cypress CY8CTMA340 series (also known as "CYTTSP" after
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the marketing name Cypress TrueTouch Standard Product) touchscreens can
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be connected to either I2C or SPI buses.
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maintainers:
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- Javier Martinez Canillas <javier@dowhile0.org>
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- Linus Walleij <linus.walleij@linaro.org>
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allOf:
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- $ref: touchscreen.yaml#
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properties:
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$nodename:
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pattern: "^touchscreen(@.*)?$"
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compatible:
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oneOf:
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- const: cypress,cy8ctma340
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- const: cypress,cy8ctst341
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- const: cypress,cyttsp-spi
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description: Legacy compatible for SPI connected CY8CTMA340
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deprecated: true
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- const: cypress,cyttsp-i2c
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description: Legacy compatible for I2C connected CY8CTMA340
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deprecated: true
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reg:
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description: I2C address when used on the I2C bus, or the SPI chip
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select index when used on the SPI bus
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clock-frequency:
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description: I2C client clock frequency, defined for host when using
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the device on the I2C bus
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minimum: 0
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maximum: 400000
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spi-max-frequency:
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description: SPI clock frequency, defined for host, defined when using
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the device on the SPI bus. The throughput is maximum 2 Mbps so the
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typical value is 2000000, if higher rates are used the total throughput
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needs to be restricted to 2 Mbps.
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minimum: 0
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maximum: 6000000
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interrupts:
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description: Interrupt to host
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maxItems: 1
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vcpin-supply:
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description: Analog power supply regulator on VCPIN pin
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vdd-supply:
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description: Digital power supply regulator on VDD pin
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reset-gpios:
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description: Reset line for the touchscreen, should be tagged
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as GPIO_ACTIVE_LOW
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bootloader-key:
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description: the 8-byte bootloader key that is required to switch
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the chip from bootloader mode (default mode) to application mode
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$ref: /schemas/types.yaml#/definitions/uint8-array
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minItems: 8
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maxItems: 8
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touchscreen-size-x: true
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touchscreen-size-y: true
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touchscreen-fuzz-x: true
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touchscreen-fuzz-y: true
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active-distance:
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description: the distance in pixels beyond which a touch must move
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before movement is detected and reported by the device
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$ref: /schemas/types.yaml#/definitions/uint32
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minimum: 0
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maximum: 15
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active-interval-ms:
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description: the minimum period in ms between consecutive
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scanning/processing cycles when the chip is in active mode
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minimum: 0
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maximum: 255
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lowpower-interval-ms:
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description: the minimum period in ms between consecutive
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scanning/processing cycles when the chip is in low-power mode
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minimum: 0
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maximum: 2550
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touch-timeout-ms:
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description: minimum time in ms spent in the active power state while no
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touches are detected before entering low-power mode
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minimum: 0
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maximum: 2550
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use-handshake:
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description: enable register-based handshake (boolean). This should only
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be used if the chip is configured to use 'blocking communication with
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timeout' (in this case the device generates an interrupt at the end of
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every scanning/processing cycle)
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$ref: /schemas/types.yaml#/definitions/flag
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additionalProperties: false
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required:
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- compatible
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- reg
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- interrupts
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- bootloader-key
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- touchscreen-size-x
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- touchscreen-size-y
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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/gpio/gpio.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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num-cs = <1>;
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cs-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
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touchscreen@0 {
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compatible = "cypress,cy8ctma340";
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reg = <0>;
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interrupt-parent = <&gpio>;
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interrupts = <20 IRQ_TYPE_EDGE_FALLING>;
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reset-gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
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vdd-supply = <&ldo_aux1_reg>;
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vcpin-supply = <&ldo_aux2_reg>;
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bootloader-key = /bits/ 8 <0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07>;
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touchscreen-size-x = <480>;
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touchscreen-size-y = <800>;
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active-interval-ms = <0>;
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touch-timeout-ms = <255>;
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lowpower-interval-ms = <10>;
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};
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};
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...
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