Add device tree bindings for the ad7877 driver. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx> --- changes in v2: - add only the used properties from touchscreen.yaml - add vendor properties. - update dt example. .../input/touchscreen/adi,ad7877.yaml | 110 ++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml diff --git a/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml new file mode 100644 index 000000000000..035e2d5bbcb8 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml @@ -0,0 +1,110 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/touchscreen/adi,ad7877.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices AD7877 Touch Screen Controller + +maintainers: + - Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx> + +description: | + Analog Devices Touch Screen Controller + https://www.analog.com/media/en/technical-documentation/data-sheets/AD7877.pdf + +allOf: + - $ref: touchscreen.yaml# + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - adi,ad7877 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + spi-max-frequency: + description: AD7877 SPI bus clock frequency. + minimum: 10000 + maximum: 20000000 + + adi,stopacq-polarity: + description: The polarity of the signal applied to the STOPACQ pin. + 0 = active low + 1 = active high + $ref: /schemas/types.yaml#/definitions/uint8 + enum: [0, 1] + + adi,first-conv-delay: + description: Delay before the first conversion. + 0 = 0.5us + 1 = 128us + 2 = 1ms + 3 = 8ms + $ref: /schemas/types.yaml#/definitions/uint8 + enum: [0, 1, 2, 3] + + adi,pen-down-acc-interval: + description: Enable the ADC to repeatedly perform conversions. + 0 = covert once + 1 = every 0.5 ms + 2 = every 1 ms + 3 = every 8 ms + $ref: /schemas/types.yaml#/definitions/uint8 + enum: [0, 1, 2, 3] + + adi,acquisition-time: + description: Select acquisition times for the ADC. + 0 = 2us + 1 = 4us + 2 = 8us + 3 = 16us + $ref: /schemas/types.yaml#/definitions/uint8 + enum: [0, 1, 2, 3] + + adi,vref-delay-usecs: + description: Delay required for the SPI transfers depending on the VREF used. + $ref: /schemas/types.yaml#/definitions/uint16 + + touchscreen-average-samples: + enum: [1, 4, 8, 16] + + touchscreen-x-plate-ohms: true + touchscreen-y-plate-ohms: true + touchscreen-min-x: true + touchscreen-min-y: true + touchscreen-max-x: true + touchscreen-max-y: true + touchscreen-max-pressure: true + touchscreen-min-pressure: true + +required: + - compatible + - reg + - interrupts + - touchscreen-average-samples + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + spi { + #address-cells = <1>; + #size-cells = <0>; + + touchscreen@0 { + compatible = "adi,ad7877"; + reg = <0>; + spi-max-frequency = <20000000>; + interrupts = <21 IRQ_TYPE_EDGE_FALLING>; + interrupt-parent = <&gpio>; + touchscreen-average-samples = <16>; + }; + }; +... -- 2.46.0
