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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/adi,ad7877.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7877 Touch Screen Controller
+
+maintainers:
+ - Antoniu Miclaus <antoniu.miclaus@analog.com>
+
+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.
+ $ref: /schemas/types.yaml#/definitions/string
+ enum: [low, high]
+
+ adi,first-conv-delay-ns:
+ description: Delay in ns before the first conversion.
+ enum: [500, 128000, 1000000, 8000000]
+
+ adi,pen-down-acc-interval:
+ description: Enable the ADC to repeatedly perform conversions.
+ 0 = convert once
+ 1 = every 0.5 ms
+ 2 = every 1 ms
+ 3 = every 8 ms
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3]
+ default: 0
+
+ adi,acquisition-time-us:
+ description: Select acquisition times in us for the ADC.
+ enum: [2, 4, 8, 16]
+
+ adi,vref-delay-us:
+ description: Delay required for the SPI transfers depending on the VREF used.
+
+ touchscreen-average-samples:
+ enum: [1, 4, 8, 16]
+
+ touchscreen-x-plate-ohms:
+ default: 400
+
+ touchscreen-min-x: true
+ touchscreen-min-y: true
+ touchscreen-size-x: true
+ touchscreen-size-y: true
+ touchscreen-max-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>;
+ adi,vref-delay-us = <100>;
+ adi,stopacq-polarity = "low";
+ adi,first-conv-delay-ns = <500>;
+ adi,pen-down-acc-interval = <0>;
+ adi,acquisition-time-us = <2>;
+ touchscreen-average-samples = <16>;
+ touchscreen-x-plate-ohms = <400>;
+ touchscreen-min-x = <0>;
+ touchscreen-min-y = <0>;
+ touchscreen-size-x = <800>;
+ touchscreen-size-y = <480>;
+ touchscreen-max-pressure = <4095>;
+ };
+ };
+...
Add device tree bindings for the ad7877 driver. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> --- changes in v3: - use strings for polarity. - use unit siffix where applies. - add defaults where applies. - add complete example. .../input/touchscreen/adi,ad7877.yaml | 109 ++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml