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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/touchscreen/ti,ads7843.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: TI's SPI driven touch screen controllers
maintainers:
- Alexander Stein <alexander.stein@ew.tq-group.com>
- Dmitry Torokhov <dmitry.torokhov@gmail.com>
- Marek Vasut <marex@denx.de>
description:
TI's ADS7843, ADS7845, ADS7846, ADS7873, TSC2046 SPI driven touch screen
controllers.
properties:
compatible:
enum:
- ti,ads7843
- ti,ads7845
- ti,ads7846
- ti,ads7873
- ti,tsc2046
interrupts:
maxItems: 1
pendown-gpio:
maxItems: 1
description:
GPIO handle describing the pin the !PENIRQ line is connected to.
vcc-supply:
description:
A regulator node for the supply voltage.
wakeup-source: true
ti,debounce-max:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Max number of additional readings per sample.
ti,debounce-rep:
$ref: /schemas/types.yaml#/definitions/uint16
description:
Additional consecutive good readings required after the first two.
ti,debounce-tol:
$ref: /schemas/types.yaml#/definitions/uint16
description:
Tolerance used for filtering.
ti,hsync-gpios:
maxItems: 1
description:
GPIO line to poll for hsync.
ti,keep-vref-on:
$ref: /schemas/types.yaml#/definitions/flag
description:
Set to keep Vref on for differential measurements as well.
ti,pendown-gpio-debounce:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Platform specific debounce time for the pendown-gpio.
ti,penirq-recheck-delay-usecs:
$ref: /schemas/types.yaml#/definitions/uint16
description:
If set to non-zero, after samples are taken this delay is applied and
penirq is rechecked, to help avoid false events. This value is
affected by the material used to build the touch layer.
ti,pressure-max:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Maximum reported pressure value.
ti,pressure-min:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Minimum reported pressure value (threshold).
ti,settle-delay-usec:
$ref: /schemas/types.yaml#/definitions/uint16
description:
Settling time of the analog signals; a function of Vcc and the
capacitance on the X/Y drivers. If set to non-zero, two samples are
taken with settle_delay us apart, and the second one is used. ~150
uSec with 0.01uF caps.
ti,swap-xy:
deprecated: true
$ref: /schemas/types.yaml#/definitions/flag
description:
Swap x and y axis.
ti,vref-delay-usecs:
$ref: /schemas/types.yaml#/definitions/uint16
description:
Vref supply delay in usecs, 0 for external Vref.
ti,vref-mv:
$ref: /schemas/types.yaml#/definitions/uint16
description:
The VREF voltage, in millivolts.
Set to 0 to use internal references (ADS7846).
ti,x-plate-ohms:
$ref: /schemas/types.yaml#/definitions/uint16
description:
Resistance of the X-plate, in Ohms.
ti,x-max:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Maximum value on the X axis.
ti,x-min:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Minimum value on the X axis.
ti,y-plate-ohms:
$ref: /schemas/types.yaml#/definitions/uint16
description:
Resistance of the Y-plate, in Ohms.
ti,y-max:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Maximum value on the Y axis.
ti,y-min:
deprecated: true
$ref: /schemas/types.yaml#/definitions/uint16
description:
Minimum value on the Y axis.
required:
- compatible
- reg
allOf:
- $ref: touchscreen.yaml#
- $ref: /schemas/spi/spi-peripheral-props.yaml#
unevaluatedProperties: false
examples:
- |
spi{
#address-cells = <1>;
#size-cells = <0>;
touchscreen@0 {
compatible = "ti,tsc2046";
reg = <0>; /* CS0 */
interrupt-parent = <&gpio1>;
interrupts = <8 0>; /* BOOT6 / GPIO 8 */
pendown-gpio = <&gpio1 8 0>;
spi-max-frequency = <1000000>;
vcc-supply = <®_vcc3>;
wakeup-source;
ti,pressure-max = /bits/ 16 <255>;
ti,x-max = /bits/ 16 <8000>;
ti,x-min = /bits/ 16 <0>;
ti,x-plate-ohms = /bits/ 16 <40>;
ti,y-max = /bits/ 16 <4800>;
ti,y-min = /bits/ 16 <0>;
};
};
|
