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dt-bindings: input: touchscreen: convert ad7879 to yaml format
Convert binding doc ad7879.txt to yaml format. Additional change: - Add ref to /schemas/spi/spi-peripheral-props.yaml - Add #gpio-cell - Remove spi-cpol and spi-cpha in example, the place hold 'spi' can't correct detect spi-controler.yaml. So these two properties can't be recongnized. Fix warning: arch/arm64/boot/dts/freescale/imx8dx-colibri-aster.dtb: /bus@5a000000/i2c@5a800000/touchscreen@2c: failed to match any schema with compatible: ['adi,ad7879-1'] Signed-off-by: Frank Li <Frank.Li@nxp.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20240810143840.3615450-1-Frank.Li@nxp.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Frank Li
Dmitry Torokhov
parent
25162a4f64
commit
4e12e55093
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* Analog Devices AD7879(-1)/AD7889(-1) touchscreen interface (SPI/I2C)
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Required properties:
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- compatible : for SPI slave, use "adi,ad7879"
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for I2C slave, use "adi,ad7879-1"
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- reg : SPI chipselect/I2C slave address
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See spi-bus.txt for more SPI slave properties
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- interrupts : touch controller interrupt
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- touchscreen-max-pressure : maximum reported pressure
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- adi,resistance-plate-x : total resistance of X-plate (for pressure
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calculation)
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Optional properties:
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- touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
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- adi,first-conversion-delay : 0-12: In 128us steps (starting with 128us)
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13 : 2.560ms
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14 : 3.584ms
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15 : 4.096ms
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This property has to be a '/bits/ 8' value
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- adi,acquisition-time : 0: 2us
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1: 4us
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2: 8us
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3: 16us
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This property has to be a '/bits/ 8' value
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- adi,median-filter-size : 0: disabled
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1: 4 measurements
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2: 8 measurements
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3: 16 measurements
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This property has to be a '/bits/ 8' value
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- adi,averaging : 0: 2 middle values (1 if median disabled)
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1: 4 middle values
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2: 8 middle values
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3: 16 values
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This property has to be a '/bits/ 8' value
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- adi,conversion-interval: : 0 : convert one time only
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1-255: 515us + val * 35us (up to 9.440ms)
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This property has to be a '/bits/ 8' value
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- gpio-controller : Switch AUX/VBAT/GPIO pin to GPIO mode
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Example:
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touchscreen0@2c {
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compatible = "adi,ad7879-1";
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reg = <0x2c>;
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interrupt-parent = <&gpio1>;
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interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
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touchscreen-max-pressure = <4096>;
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adi,resistance-plate-x = <120>;
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adi,first-conversion-delay = /bits/ 8 <3>;
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adi,acquisition-time = /bits/ 8 <1>;
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adi,median-filter-size = /bits/ 8 <2>;
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adi,averaging = /bits/ 8 <1>;
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adi,conversion-interval = /bits/ 8 <255>;
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};
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touchscreen1@1 {
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compatible = "adi,ad7879";
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spi-max-frequency = <5000000>;
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reg = <1>;
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spi-cpol;
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spi-cpha;
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gpio-controller;
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interrupt-parent = <&gpio1>;
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interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
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touchscreen-max-pressure = <4096>;
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adi,resistance-plate-x = <120>;
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adi,first-conversion-delay = /bits/ 8 <3>;
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adi,acquisition-time = /bits/ 8 <1>;
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adi,median-filter-size = /bits/ 8 <2>;
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adi,averaging = /bits/ 8 <1>;
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adi,conversion-interval = /bits/ 8 <255>;
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};
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@ -0,0 +1,150 @@
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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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$id: http://devicetree.org/schemas/input/touchscreen/adi,ad7879.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Analog Devices AD7879(-1)/AD7889(-1) touchscreen interface (SPI/I2C)
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maintainers:
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- Frank Li <Frank.Li@nxp.com>
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properties:
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compatible:
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description: |
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for SPI slave, use "adi,ad7879"
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for I2C slave, use "adi,ad7879-1"
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enum:
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- adi,ad7879
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- adi,ad7879-1
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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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touchscreen-max-pressure:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: maximum reported pressure
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adi,resistance-plate-x:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: total resistance of X-plate (for pressure calculation)
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touchscreen-swapped-x-y:
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$ref: /schemas/types.yaml#/definitions/flag
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description: X and Y axis are swapped (boolean)
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adi,first-conversion-delay:
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$ref: /schemas/types.yaml#/definitions/uint8
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default: 0
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minimum: 0
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maximum: 15
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description: |
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0-12: In 128us steps (starting with 128us)
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13 : 2.560ms
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14 : 3.584ms
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15 : 4.096ms
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This property has to be a '/bits/ 8' value
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adi,acquisition-time:
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$ref: /schemas/types.yaml#/definitions/uint8
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default: 0
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enum: [0, 1, 2, 3]
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description: |
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0: 2us
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1: 4us
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2: 8us
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3: 16us
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This property has to be a '/bits/ 8' value
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adi,median-filter-size:
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$ref: /schemas/types.yaml#/definitions/uint8
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default: 0
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enum: [0, 1, 2, 3]
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description: |
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0: disabled
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1: 4 measurements
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2: 8 measurements
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3: 16 measurements
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This property has to be a '/bits/ 8' value
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adi,averaging:
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$ref: /schemas/types.yaml#/definitions/uint8
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default: 0
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enum: [0, 1, 2, 3]
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description: |
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0: 2 middle values (1 if median disabled)
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1: 4 middle values
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2: 8 middle values
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3: 16 values
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This property has to be a '/bits/ 8' value
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adi,conversion-interval:
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$ref: /schemas/types.yaml#/definitions/uint8
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default: 0
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description: |
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0 : convert one time only
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1-255: 515us + val * 35us (up to 9.440ms)
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This property has to be a '/bits/ 8' value
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gpio-controller: true
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"#gpio-cells":
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const: 1
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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: /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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#include <dt-bindings/interrupt-controller/irq.h>
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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touchscreen0@2c {
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compatible = "adi,ad7879-1";
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reg = <0x2c>;
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interrupt-parent = <&gpio1>;
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interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
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touchscreen-max-pressure = <4096>;
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adi,resistance-plate-x = <120>;
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adi,first-conversion-delay = /bits/ 8 <3>;
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adi,acquisition-time = /bits/ 8 <1>;
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adi,median-filter-size = /bits/ 8 <2>;
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adi,averaging = /bits/ 8 <1>;
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adi,conversion-interval = /bits/ 8 <255>;
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};
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};
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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touchscreen1@1 {
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compatible = "adi,ad7879";
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reg = <1>;
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spi-max-frequency = <5000000>;
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gpio-controller;
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#gpio-cells = <1>;
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interrupt-parent = <&gpio1>;
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interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
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touchscreen-max-pressure = <4096>;
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adi,resistance-plate-x = <120>;
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adi,first-conversion-delay = /bits/ 8 <3>;
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adi,acquisition-time = /bits/ 8 <1>;
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adi,median-filter-size = /bits/ 8 <2>;
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adi,averaging = /bits/ 8 <1>;
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adi,conversion-interval = /bits/ 8 <255>;
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};
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};
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