description: >
  M5Stack Cardputer internal GPIO matrix keyboard: 4 rows x 14 columns, scanned via 3
  binary-encoded column-select output pins and 7 row input pins. Exposes a KEYBOARD_TYPE
  device. Modifier keys (fn/shift/ctrl/opt/alt/tab) are consumed internally and never emitted
  as their own key events. Regular keys emit their ASCII character (shifted variant when
  shift or ctrl is held). With fn held: del -> forward delete, enter -> enter, ` -> escape,
  , -> left, / -> right, ; -> previous (group navigation), . -> next (group navigation).

compatible: "m5stack,cardputer-keyboard"

properties:
  pins-output:
    type: phandle-array
    element-type: "struct GpioPinSpec"
    required: true
    description: 3 GPIO pins driving the binary-encoded column-select lines, in scan-bit order
  pins-input:
    type: phandle-array
    element-type: "struct GpioPinSpec"
    required: true
    description: 7 GPIO pins reading the row lines, in scan-bit order
