184 lines
4.6 KiB
YAML
184 lines
4.6 KiB
YAML
# 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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$id: http://devicetree.org/schemas/input/touchscreen/ti,ads7843.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: TI's SPI driven touch screen controllers
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maintainers:
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- Alexander Stein <alexander.stein@ew.tq-group.com>
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- Dmitry Torokhov <dmitry.torokhov@gmail.com>
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- Marek Vasut <marex@denx.de>
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description:
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TI's ADS7843, ADS7845, ADS7846, ADS7873, TSC2046 SPI driven touch screen
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controllers.
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properties:
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compatible:
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enum:
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- ti,ads7843
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- ti,ads7845
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- ti,ads7846
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- ti,ads7873
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- ti,tsc2046
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interrupts:
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maxItems: 1
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pendown-gpio:
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maxItems: 1
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description:
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GPIO handle describing the pin the !PENIRQ line is connected to.
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vcc-supply:
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description:
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A regulator node for the supply voltage.
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wakeup-source: true
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ti,debounce-max:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Max number of additional readings per sample.
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ti,debounce-rep:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Additional consecutive good readings required after the first two.
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ti,debounce-tol:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Tolerance used for filtering.
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ti,hsync-gpios:
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maxItems: 1
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description:
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GPIO line to poll for hsync.
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ti,keep-vref-on:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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Set to keep Vref on for differential measurements as well.
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ti,pendown-gpio-debounce:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Platform specific debounce time for the pendown-gpio.
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ti,penirq-recheck-delay-usecs:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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If set to non-zero, after samples are taken this delay is applied and
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penirq is rechecked, to help avoid false events. This value is
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affected by the material used to build the touch layer.
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ti,pressure-max:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Maximum reported pressure value.
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ti,pressure-min:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Minimum reported pressure value (threshold).
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ti,settle-delay-usec:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Settling time of the analog signals; a function of Vcc and the
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capacitance on the X/Y drivers. If set to non-zero, two samples are
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taken with settle_delay us apart, and the second one is used. ~150
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uSec with 0.01uF caps.
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ti,swap-xy:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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Swap x and y axis.
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ti,vref-delay-usecs:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Vref supply delay in usecs, 0 for external Vref.
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ti,vref-mv:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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The VREF voltage, in millivolts.
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Set to 0 to use internal references (ADS7846).
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ti,x-plate-ohms:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Resistance of the X-plate, in Ohms.
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ti,x-max:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Maximum value on the X axis.
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ti,x-min:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Minimum value on the X axis.
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ti,y-plate-ohms:
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Resistance of the Y-plate, in Ohms.
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ti,y-max:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Maximum value on the Y axis.
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ti,y-min:
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deprecated: true
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$ref: /schemas/types.yaml#/definitions/uint16
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description:
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Minimum value on the Y axis.
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required:
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- compatible
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- reg
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allOf:
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- $ref: touchscreen.yaml#
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- $ref: /schemas/spi/spi-peripheral-props.yaml#
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unevaluatedProperties: false
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examples:
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- |
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spi{
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#address-cells = <1>;
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#size-cells = <0>;
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touchscreen@0 {
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compatible = "ti,tsc2046";
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reg = <0>; /* CS0 */
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interrupt-parent = <&gpio1>;
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interrupts = <8 0>; /* BOOT6 / GPIO 8 */
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pendown-gpio = <&gpio1 8 0>;
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spi-max-frequency = <1000000>;
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vcc-supply = <®_vcc3>;
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wakeup-source;
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ti,pressure-max = /bits/ 16 <255>;
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ti,x-max = /bits/ 16 <8000>;
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ti,x-min = /bits/ 16 <0>;
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ti,x-plate-ohms = /bits/ 16 <40>;
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ti,y-max = /bits/ 16 <4800>;
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ti,y-min = /bits/ 16 <0>;
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};
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};
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