| Required properties: | |
| - compatible: "ti,tca8418" | |
| - reg: the I2C address | |
| - interrupts: IRQ line number, should trigger on falling edge | |
| - keypad,num-rows: The number of rows | |
| - keypad,num-columns: The number of columns | |
| - linux,keymap: Keys definitions, see keypad-matrix. |