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Diffstat (limited to 'Documentation/devicetree/bindings/input/touchscreen/adi,ad7879.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/input/touchscreen/adi,ad7879.yaml | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/touchscreen/adi,ad7879.yaml b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7879.yaml new file mode 100644 index 000000000000..caa5fa3cc3f1 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7879.yaml @@ -0,0 +1,150 @@ +# 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>; + }; + }; |