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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/adi,ad7879.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD7879(-1)/AD7889(-1) touchscreen interface (SPI/I2C)
maintainers:
- Frank Li <Frank.Li@nxp.com>
properties:
compatible:
description: |
for SPI slave, use "adi,ad7879"
for I2C slave, use "adi,ad7879-1"
enum:
- adi,ad7879
- adi,ad7879-1
reg:
maxItems: 1
interrupts:
maxItems: 1
touchscreen-max-pressure:
$ref: /schemas/types.yaml#/definitions/uint32
description: maximum reported pressure
adi,resistance-plate-x:
$ref: /schemas/types.yaml#/definitions/uint32
description: total resistance of X-plate (for pressure calculation)
touchscreen-swapped-x-y:
$ref: /schemas/types.yaml#/definitions/flag
description: X and Y axis are swapped (boolean)
adi,first-conversion-delay:
$ref: /schemas/types.yaml#/definitions/uint8
default: 0
minimum: 0
maximum: 15
description: |
0-12: In 128us steps (starting with 128us)
13 : 2.560ms
14 : 3.584ms
15 : 4.096ms
This property has to be a '/bits/ 8' value
adi,acquisition-time:
$ref: /schemas/types.yaml#/definitions/uint8
default: 0
enum: [0, 1, 2, 3]
description: |
0: 2us
1: 4us
2: 8us
3: 16us
This property has to be a '/bits/ 8' value
adi,median-filter-size:
$ref: /schemas/types.yaml#/definitions/uint8
default: 0
enum: [0, 1, 2, 3]
description: |
0: disabled
1: 4 measurements
2: 8 measurements
3: 16 measurements
This property has to be a '/bits/ 8' value
adi,averaging:
$ref: /schemas/types.yaml#/definitions/uint8
default: 0
enum: [0, 1, 2, 3]
description: |
0: 2 middle values (1 if median disabled)
1: 4 middle values
2: 8 middle values
3: 16 values
This property has to be a '/bits/ 8' value
adi,conversion-interval:
$ref: /schemas/types.yaml#/definitions/uint8
default: 0
description: |
0 : convert one time only
1-255: 515us + val * 35us (up to 9.440ms)
This property has to be a '/bits/ 8' value
gpio-controller: true
"#gpio-cells":
const: 1
required:
- compatible
- reg
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
touchscreen0@2c {
compatible = "adi,ad7879-1";
reg = <0x2c>;
interrupt-parent = <&gpio1>;
interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
touchscreen-max-pressure = <4096>;
adi,resistance-plate-x = <120>;
adi,first-conversion-delay = /bits/ 8 <3>;
adi,acquisition-time = /bits/ 8 <1>;
adi,median-filter-size = /bits/ 8 <2>;
adi,averaging = /bits/ 8 <1>;
adi,conversion-interval = /bits/ 8 <255>;
};
};
- |
#include <dt-bindings/interrupt-controller/irq.h>
spi {
#address-cells = <1>;
#size-cells = <0>;
touchscreen1@1 {
compatible = "adi,ad7879";
reg = <1>;
spi-max-frequency = <5000000>;
gpio-controller;
#gpio-cells = <1>;
interrupt-parent = <&gpio1>;
interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
touchscreen-max-pressure = <4096>;
adi,resistance-plate-x = <120>;
adi,first-conversion-delay = /bits/ 8 <3>;
adi,acquisition-time = /bits/ 8 <1>;
adi,median-filter-size = /bits/ 8 <2>;
adi,averaging = /bits/ 8 <1>;
adi,conversion-interval = /bits/ 8 <255>;
};
};
|
