ti,am3359-tsc.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/input/touchscreen/ti,am3359-tsc.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: TI AM3359 Touchscreen controller
    8 
    9 maintainers:
   10   - Miquel Raynal <miquel.raynal@bootlin.com>
   11 
   12 properties:
   13   compatible:
   14     const: ti,am3359-tsc
   15 
   16   ti,wires:
   17     description: Wires refer to application modes i.e. 4/5/8 wire touchscreen
   18       support on the platform.
   19     $ref: /schemas/types.yaml#/definitions/uint32
   20     enum: [4, 5, 8]
   21 
   22   ti,x-plate-resistance:
   23     description: X plate resistance
   24     $ref: /schemas/types.yaml#/definitions/uint32
   25 
   26   ti,coordinate-readouts:
   27     description: The sequencer supports a total of 16 programmable steps. Each
   28       step is used to read a single coordinate. A single readout is enough but
   29       multiple reads can increase the quality. A value of 5 means, 5 reads for
   30       X, 5 for Y and 2 for Z (always). This utilises 12 of the 16 software steps
   31       available. The remaining 4 can be used by the ADC.
   32     $ref: /schemas/types.yaml#/definitions/uint32
   33     minimum: 1
   34     maximum: 6
   35 
   36   ti,wire-config:
   37     description: Different boards could have a different order for connecting
   38       wires on touchscreen. We need to provide an 8-bit number where the
   39       first four bits represent the analog lines and the next 4 bits represent
   40       positive/negative terminal on that input line. Notations to represent the
   41       input lines and terminals respectively are as follows, AIN0 = 0, AIN1 = 1
   42       and so on until AIN7 = 7. XP = 0, XN = 1, YP = 2, YN = 3.
   43     $ref: /schemas/types.yaml#/definitions/uint32-array
   44     minItems: 4
   45     maxItems: 8
   46 
   47   ti,charge-delay:
   48     description: Length of touch screen charge delay step in terms of ADC clock
   49       cycles. Charge delay value should be large in order to avoid false pen-up
   50       events. This value effects the overall sampling speed, hence need to be
   51       kept as low as possible, while avoiding false pen-up event. Start from a
   52       lower value, say 0x400, and increase value until false pen-up events are
   53       avoided. The pen-up detection happens immediately after the charge step,
   54       so this does in fact function as a hardware knob for adjusting the amount
   55       of "settling time".
   56     $ref: /schemas/types.yaml#/definitions/uint32
   57 
   58 required:
   59   - compatible
   60   - ti,wires
   61   - ti,x-plate-resistance
   62   - ti,coordinate-readouts
   63   - ti,wire-config
   64 
   65 additionalProperties: false
   66 
   67 examples:
   68   - |
   69     tsc {
   70         compatible = "ti,am3359-tsc";
   71         ti,wires = <4>;
   72         ti,x-plate-resistance = <200>;
   73         ti,coordinate-readouts = <5>;
   74         ti,wire-config = <0x00 0x11 0x22 0x33>;
   75         ti,charge-delay = <0x400>;
   76     };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/input/touchscreen/ti,am3359-tsc.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/input/touchscreen/ti,am3359-tsc.yaml