xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/auxdisplay/holtek,ht16k33.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Holtek HT16K33 RAM mapping 16*8 LED controller with keyscan

maintainers:
  - Robin van der Gracht <robin@protonic.nl>

allOf:
  - $ref: /schemas/input/matrix-keymap.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - adafruit,3108  # 0.56" 4-Digit 7-Segment FeatherWing Display (Red)
              - adafruit,3130  # 0.54" Quad Alphanumeric FeatherWing Display (Red)
          - const: holtek,ht16k33

      - const: holtek,ht16k33     # Generic 16*8 LED controller with dot-matrix display

  reg:
    maxItems: 1

  refresh-rate-hz:
    maxItems: 1
    description: Display update interval in Hertz for dot-matrix displays

  interrupts:
    maxItems: 1

  debounce-delay-ms:
    maxItems: 1
    description: Debouncing interval time in milliseconds

  linux,keymap: true

  linux,no-autorepeat:
    type: boolean
    description: Disable keyrepeat

  default-brightness-level:
    minimum: 1
    maximum: 16
    default: 16
    description: Initial brightness level

  led:
    type: object
    $ref: /schemas/leds/common.yaml#
    unevaluatedProperties: false

required:
  - compatible
  - reg

if:
  properties:
    compatible:
      const: holtek,ht16k33
then:
  required:
    - refresh-rate-hz

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/input/input.h>
    #include <dt-bindings/leds/common.h>
    i2c {
            #address-cells = <1>;
            #size-cells = <0>;

            ht16k33: ht16k33@70 {
                    compatible = "holtek,ht16k33";
                    reg = <0x70>;
                    refresh-rate-hz = <20>;
                    interrupt-parent = <&gpio4>;
                    interrupts = <5 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
                    debounce-delay-ms = <50>;
                    linux,keymap = <MATRIX_KEY(2, 0, KEY_F6)>,
                                   <MATRIX_KEY(3, 0, KEY_F8)>,
                                   <MATRIX_KEY(4, 0, KEY_F10)>,
                                   <MATRIX_KEY(5, 0, KEY_F4)>,
                                   <MATRIX_KEY(6, 0, KEY_F2)>,
                                   <MATRIX_KEY(2, 1, KEY_F5)>,
                                   <MATRIX_KEY(3, 1, KEY_F7)>,
                                   <MATRIX_KEY(4, 1, KEY_F9)>,
                                   <MATRIX_KEY(5, 1, KEY_F3)>,
                                   <MATRIX_KEY(6, 1, KEY_F1)>;

                    led {
                            color = <LED_COLOR_ID_RED>;
                            function = LED_FUNCTION_BACKLIGHT;
                            linux,default-trigger = "backlight";
                    };
            };
      };